UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
ýQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period endedMarch 31, 20182019
OR
oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission file number 001-34057
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AGNC INVESTMENT CORP.
(Exact name of registrant as specified in its charter)

Delaware 26-1701984
(State or Other Jurisdiction of
Incorporation or Organization)
 
(I.R.S. Employer
Identification No.)
2 Bethesda Metro Center, 12th Floor
Bethesda, Maryland 20814
(Address of principal executive offices)
(301) 968-9315
(Registrant’s telephone number, including area code)
 __________________________________________________


Indicate by check mark whether the registrant (1) has filed all reports to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).   Yes  ý    No  ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.
Large accelerated filerý Accelerated filer¨o
     
Non-accelerated filer¨o(Do not check if a smaller reporting company)Smaller Reporting Company¨o
     
Emerging growth company¨o   
If an emerging growth company, indicate by check mark if registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý


The number of shares of the issuer's common stock, $0.01 par value, outstanding as ofApril 30, 20182019 was 391,327,480.536,412,404.

 






AGNC INVESTMENT CORP.
TABLE OF CONTENTS
 
 
   
 
   






PART I. FINANCIAL INFORMATION

Item 1. Financial Statements
AGNC INVESTMENT CORP.
CONSOLIDATED BALANCE SHEETS
(in millions, except per share data)


March 31, 2018 December 31, 2017March 31, 2019 December 31, 2018
(Unaudited)  (Unaudited)  
Assets:      
Agency securities, at fair value (including pledged securities of $51,434 and $53,055, respectively)$54,141
 $55,506
Agency securities, at fair value (including pledged securities of $89,471 and $78,619, respectively)$93,044
 $82,291
Agency securities transferred to consolidated variable interest entities, at fair value (pledged securities)621
 662
425
 436
Credit risk transfer securities, at fair value884
 876
Non-Agency securities, at fair value36
 36
U.S. Treasury securities, at fair value224
 
REIT equity securities, at fair value42
 29
Credit risk transfer securities, at fair value (including pledged securities of $142 and $141, respectively)1,129
 1,012
Non-Agency securities, at fair value (including pledged securities of $45 and $45, respectively)672
 548
U.S. Treasury securities, at fair value (including pledged securities of $121 and $0, respectively)121
 46
Cash and cash equivalents972
 1,046
929
 921
Restricted cash386
 317
517
 599
Derivative assets, at fair value410
 205
253
 273
Receivable for investment securities sold (pledged securities)439
 489
Receivable under reverse repurchase agreements10,770
 10,961
20,430
 21,813
Goodwill and other intangible assets, net550
 551
Goodwill526
 526
Other assets185
 187
322
 287
Total assets$69,221
 $70,376
$118,807
 $109,241
Liabilities:      
Repurchase agreements$48,956
 $50,296
$86,685
 $75,717
Debt of consolidated variable interest entities, at fair value336
 357
266
 275
Payable for investment securities purchased457
 95
1,125
 1,204
Derivative liabilities, at fair value32
 28
53
 84
Dividends payable80
 80
107
 106
Obligation to return securities borrowed under reverse repurchase agreements, at fair value10,352
 10,467
19,275
 21,431
Accounts payable and other liabilities670
 299
795
 518
Total liabilities60,883
 61,622
108,306
 99,335
Stockholders' equity:      
7.750% Series B Cumulative Redeemable Preferred Stock (aggregate liquidation preference of $175)169
 169
169
 169
7.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock (aggregate liquidation preference of $325)315
 315
315
 315
Common stock - $0.01 par value; 600.0 shares authorized; 391.3 shares issued and outstanding4
 4
6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock (aggregate liquidation preference of $235)227
 
Common stock - $0.01 par value; 900 shares authorized; 536.3 shares issued and outstanding5
 5
Additional paid-in capital11,174
 11,173
13,795
 13,793
Retained deficit(2,358) (2,562)(3,467) (3,433)
Accumulated other comprehensive loss(966) (345)(543) (943)
Total stockholders' equity8,338
 8,754
10,501
 9,906
Total liabilities and stockholders' equity$69,221
 $70,376
$118,807
 $109,241
See accompanying notes to consolidated financial statements.




AGNC INVESTMENT CORP.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)
(in millions, except per share data)

 
Three Months Ended March 31,Three Months Ended March 31,
2018 20172019 2018
Interest income:      
Interest income$431
 $296
$705
 $431
Interest expense206
 98
541
 206
Net interest income225
 198
164
 225
Other gain (loss), net:      
Loss on sale of investment securities, net(2) (84)
Gain (loss) on sale of investment securities, net60
 (2)
Unrealized gain (loss) on investment securities measured at fair value through net income, net(523) 16
1,060
 (523)
Gain (loss) on derivative instruments and other securities, net738
 (40)(1,000) 738
Management fee income4
 4

 4
Total other gain (loss), net:217
 (104)
Total other gain, net:120
 217
Expenses:      
Compensation and benefits10
 10
10
 10
Other operating expenses8
 8
Total operating expenses18
 18
Other operating expense9
 8
Total operating expense19
 18
Net income424
 76
265
 424
Dividend on preferred stock9
 7
10
 9
Net income available to common stockholders$415
 $69
$255
 $415
      
Net income$424
 $76
$265
 $424
Other comprehensive income (loss):      
Unrealized gain (loss) on available-for-sale securities, net(621) 46
400
 (621)
Comprehensive income (loss)(197) 122
665
 (197)
Dividend on preferred stock9
 7
10
 9
Comprehensive income (loss) available (attributable) to common stockholders$(206) $115
$655
 $(206)
      
Weighted average number of common shares outstanding - basic391.3
 331.0
536.7
 391.3
Weighted average number of common shares outstanding - diluted391.5
 331.1
537.2
 391.5
Net income per common share - basic and diluted$1.06
 $0.21
Net income per common share - basic$0.48
 $1.06
Net income per common share - diluted$0.47
 $1.06
Dividends declared per common share$0.54
 $0.54
$0.54
 $0.54
See accompanying notes to consolidated financial statements.


AGNC INVESTMENT CORP.
CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
(Unaudited)
(in millions)


8.000% Series A Cumulative Redeemable Preferred Stock 7.750% Series B Cumulative Redeemable Preferred Stock 7.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock Common Stock Additional
Paid-in
Capital
 Retained
Deficit
 Accumulated
Other
Comprehensive
Income (Loss)
 Total7.750% Series B Cumulative Redeemable Preferred Stock 7.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock 6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock Common Stock Additional
Paid-in
Capital
 Retained
Deficit
 Accumulated
Other
Comprehensive
Income (Loss)
 Total
 Shares Amount 
Balance, December 31, 2016$167
 $169
 $
 331.0
 $3
 $9,932
 $(2,518) $(397) $7,356
Net income
 
 
 
 
 
 76
 
 76
Other comprehensive income:                

Unrealized gain on available-for-sale securities, net
 
 
 
 
 
 
 46
 46
Preferred dividends declared
 
 
 
 
 
 (7) 

 (7)
Common dividends declared
 
 
 
 
 
 (179) 
 (179)
Balance, March 31, 2017$167
 $169
 $
 331.0
 $3
 $9,932
 $(2,628) $(351) $7,292
                 7.750% Series B Cumulative Redeemable Preferred Stock 7.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock 6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock Shares Amount Additional
Paid-in
Capital
 Retained
Deficit
 Accumulated
Other
Comprehensive
Income (Loss)
 Total
Balance, December 31, 2017$
 $169
 $315
 391.3
 $4
 $11,173
 $(2,562) $(345) $8,754
 391.3
 $4
 
Net income
 
 
 
 
 
 424
 
 424

 
 
 
 
 
 424
 
 424
Other comprehensive loss:                                 

Unrealized loss on available-for-sale securities, net
 
 
 
 
 
 
 (621) (621)
 
 
 
 
 
 
 (621) (621)
Stock-based compensation
 
 
 
 
 1
 
 
 1

 
 
 
 
 1
 
 
 1
Preferred dividends declared
 
 
 
 
 
 (9) 
 (9)
 
 
 
 
 
 (9) 
 (9)
Common dividends declared
 
 
 
 
 
 (211) 
 (211)
 
 
 
 
 
 (211) 
 (211)
Balance, March 31, 2018$
 $169
 $315
 391.3
 $4
 $11,174
 $(2,358) $(966) $8,338
$169
 $315
 $
 391.3
 $4
 $11,174
 $(2,358) $(966) $8,338
                 
Balance, December 31, 2018$169
 $315
 
 536.3
 $5
 $13,793
 $(3,433) $(943) $9,906
Net income
 
 
 
 
 
 265
 
 265
Other comprehensive income:                 
Unrealized gain on available-for-sale securities, net
 
 
 
 
 
 
 400
 400
Stock-based compensation
 
 
 
 
 2
 
 
 2
Issuance of preferred stock
 
 227
 
 
 
 
 
 227
Preferred dividends declared
 
 
 
 
 
 (10) 
 (10)
Common dividends declared
 
 
 
 
 
 (289) 
 (289)
Balance, March 31, 2019$169
 $315
 $227
 536.3
 $5
 $13,795
 $(3,467) $(543) $10,501
See accompanying notes to consolidated financial statements.








AGNC INVESTMENT CORP.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
(in millions)
Three Months Ended March 31,Three Months Ended March 31,
2018 20172019 2018
Operating activities:      
Net income$424
 $76
$265
 $424
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of premiums and discounts on mortgage-backed securities, net69
 89
142
 69
Amortization of intangible assets1
 1

 1
Stock-based compensation1
 
2
 1
Loss on sale of investment securities, net2
 84
(Gain) loss on sale of investment securities, net(60) 2
Unrealized (gain) loss on investment securities measured at fair value through net income, net523
 (16)(1,060) 523
(Gain) loss on derivative instruments and other securities, net(738) 40
1,000
 (738)
Decrease in other assets3
 125
Increase (decrease) in accounts payable and other accrued liabilities3
 (9)
(Increase) decrease in other assets(35) 3
Increase in accounts payable and other accrued liabilities75
 3
Net cash provided by operating activities288
 390
329
 288
Investing activities:      
Purchases of Agency mortgage-backed securities(2,287) (4,573)(16,038) (2,287)
Purchases of credit risk transfer and non-Agency securities(215) (317)(499) (215)
Proceeds from sale of Agency mortgage-backed securities1,181
 4,424
4,694
 1,181
Proceeds from sale of credit risk transfer and non-Agency securities208
 193
297
 208
Principal collections on Agency mortgage-backed securities1,661
 1,636
1,889
 1,661
Principal collections on credit risk transfer and non-Agency securities
 4
5
 
Payments on U.S. Treasury securities(1,345) (1,748)(7,550) (1,345)
Proceeds from U.S. Treasury securities1,403
 2,999
5,103
 1,403
Net proceeds from (payments on) reverse repurchase agreements231
 (1,192)
Net proceeds from reverse repurchase agreements1,526
 231
Net proceeds from (payments on) derivative instruments466
 (72)(714) 466
Purchases of REIT equity securities(16) 
Net cash provided by (used in) investing activities1,287
 1,354
Net payments on other investing activity
 (16)
Net cash (used in) provided by investing activities(11,287) 1,287
Financing activities:      
Proceeds from repurchase arrangements243,168
 77,864
930,289
 243,168
Payments on repurchase agreements(244,507) (76,347)(919,321) (244,507)
Payments on Federal Home Loan Bank advances
 (3,037)
Payments on debt of consolidated variable interest entities(21) (28)(13) (21)
Net proceeds from preferred stock issuance227
 
Cash dividends paid(220) (186)(298) (220)
Net cash provided by (used in) financing activities(1,580) (1,734)
Net cash (used in) provided by financing activities10,884
 (1,580)
Net change in cash, cash equivalents and restricted cash(5) 10
(74) (5)
Cash, cash equivalents and restricted cash at beginning of period1,363
 1,282
1,520
 1,363
Cash, cash equivalents and restricted cash at end of period$1,358
 $1,292
$1,446
 $1,358
See accompanying notes to consolidated financial statements.




AGNC INVESTMENT CORP.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited)
Note 1. Basis of Presentation
The unaudited interim consolidated financial statements of AGNC Investment Corp. (referred throughout this report as the "Company," "we," "us" and "our") are prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. In the opinion of management, all adjustments, consisting solely of normal recurring accruals, necessary for the fair presentation of financial statements for the interim period have been included. The current period’s results of operations are not necessarily indicative of results that ultimately may be achieved for the year.
Our unaudited interim consolidated financial statements include the accounts of all of our wholly-owned subsidiaries and variable interest entities for which we are the primary beneficiary. Significant intercompany accounts and transactions have been eliminated.
Adoption of Accounting Standard Updates
As of January 1, 2018, we adopted Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers(Topic 606), and ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. The adoption of ASU 2014-09resulted in reclassification of expense reimbursements from MTGE Investment Corp. ("MTGE") from an other operating expense offset to management fee income on the consolidated statements of comprehensive income. Net income was not impacted. The adoption of ASU 2016-18 resulted in the presentation of restricted cash with cash and cash equivalents on the consolidated statements of cash flows when reconciling the total beginning and ending amounts. Our prior period results have been revised to conform to the current presentation.


Note 2. Organization
We were organized in Delaware on January 7, 2008 and commenced operations on May 20, 2008 following the completion of our initial public offering. Our common stock is traded on The Nasdaq Global Select Market under the symbol "AGNC."
We are internally-managed, and our principal objective is to provide our stockholders with attractive risk-adjusted returns through a combination of monthly dividends and tangible net book value accretion. We generate income from the interest earned on our investments, net of associated borrowing and hedging costs, and net realized gains and losses on our investment and hedging activities.
We operate to qualify to be taxed as a real estate investment trust ("REIT") under the Internal Revenue Code of 1986, as amended (the "Internal Revenue Code"). As a REIT, we are required to distribute annually 90% of our taxable income. So long as we continue to qualify asAs a REIT, we will generally not be subject to U.S. Federalfederal or state corporate taxes on our taxable income to the extent that we distribute our annual taxable income to our stockholders on a timely basis. It is our intention to distribute 100% of our taxable income, after application of available tax attributes, within the limits prescribed by the Internal Revenue Code, which may extend into the subsequent tax year.
We earn incomeinvest primarily from investing in Agency residential mortgage-backed securities ("Agency RMBS") for which the principal and interest payments are guaranteed by a U.S. Government-sponsored enterprise ("GSE") or a U.S. Government agency. We may also invest in other types of mortgage and mortgage-related securities, such as credit risk transfer ("CRT") securities and non-Agency residential and commercial mortgage-backed securities ("non-Agency RMBS" and "CMBS," respectively), where repayment of principal and interest is not guaranteed by a U.S. Government-sponsored enterpriseGSE or U.S. Government agency.agency and in other investments in, or related to, the housing, mortgage or real estate markets. We fund our investments primarily through borrowings structured as repurchase agreements.
Our principal objective is to provide our stockholders with attractive risk-adjusted returns through a combination of monthly dividends and tangible net book value accretion. We generate income from the interest earned on our investments, net of associated borrowing and hedging costs, and net realized gains and losses on our investment and hedging activities.


Note 3. Summary of Significant Accounting Policies
Investment Securities
Agency RMBS consist of residential mortgage pass-through securities and collateralized mortgage obligations ("CMOs") guaranteed by the Federal National Mortgage Association ("Fannie Mae"), Federal Home Loan Mortgage Corporation ("Freddie Mac," and together with Fannie Mae, the "GSEs") or the Government National Mortgage Association ("Ginnie Mae").


CRT securities are risk sharing instruments issued by the GSEs, and similarly structured transactions issued by third-party market participants, that transfer a portion of the risk associated with credit losses within pools of conventional residential mortgage loans from the GSEs and/or third parties to private investors. Unlike Agency RMBS, full repayment of the original principal balance of CRT securities is not guaranteed by a GSE or U.S. Government agency; rather, "credit risk transfer" is achieved by writing down the outstanding principal balance of the CRT securities if credit losses on a related pool of loans exceed certain thresholds. By reducing the amount that they are obligated to repay to holders of CRT securities, the GSEs and/or other third parties offset credit losses on the related loans.


Non-Agency RMBS and CMBS (together, "Non-Agency MBS") are backed by residential and commercial mortgage loans, respectively, packaged and securitized by a private institution, such as a commercial bank. Non-Agency MBS typically benefit from credit enhancements derived from structural elements, such as subordination, overcollateralization or insurance, but nonetheless carry a higher level of credit exposure than Agency RMBS.
Mortgage-relatedAll of our securities may also include investments in the common stock of other publicly traded mortgage REITs, including MTGE, that primarily invest in Agency securities, non-Agency securities, other mortgage related instruments and/or real estateare reported at fair value on a leveraged basis. As of March 31, 2018, our investments in REIT equity securities consisted solely of MTGE common stock.
consolidated balance sheet. Accounting Standards Codification ("ASC") Topic 320, Investments—Debt and Equity Securities, requires that at the time of purchase, we designate a security as held-to-maturity, available-for-sale or trading, depending on our ability and intent to hold such security to maturity. Alternatively, we may elect the fair value option of accounting for such securities pursuant to ASC Topic 825, Financial Instruments. All ofPrior to fiscal year 2017, we primarily designated our investment securities are reported at fair value as they have either been designated as available-for-sale or trading oravailable-for-sale. On January 1, 2017, we have electedbegan electing the fair value option of accounting.accounting for all investment securities acquired after fiscal year 2016. Unrealized gains and losses on securities classified as available-for-sale are reported in accumulated other comprehensive income ("OCI"). Unrealized gains and losses on securities classified as trading or for which we elected the fair value option or are classified as trading are reported in net income through other gain (loss) during the period in which they occur. Upon the sale of a security designated as available-for-sale, we determine the cost of the security and the amount of unrealized gains or losses to reclassify out of accumulated OCI into earnings based on the specific identification method.
Prior to fiscal year 2017, we primarily designated In our investment securities as available-for-sale. On January 1, 2017, we began electingview, the election of the fair value option of accounting for all investment securities acquired after fiscal year 2016. In our view, this election simplifies the accounting for investment securities and more appropriately reflects the results of our operations for a particular reporting period, as the fair value changes for these assets are presented in a manner consistent with the presentation and timing of the fair value changes of our hedgingderivative instruments. We are not permitted to change the designation of securities acquired prior to January 1, 2017; accordingly, such securities will continue to be classified as available-for-sale securities until we receive full repayment of principal or we dispose of the security.
We estimate the fair value of our investment securities based on prices provided by multiple third-party pricing services and non-binding dealer quotes (collectively "pricing sources"). These pricing sources use various valuation approaches, including market and income approaches, using "Level 2" inputs. The pricing sources primarily utilize a matrix pricing technique that interpolates the estimated fair value of our Agency RMBS based on observed quoted prices for forward contracts in the Agency RMBS "to-be-announced" market ("TBA securities") of the same coupon, maturity and issuer, adjusted to reflect the specific characteristics of the pool of mortgages underlying the Agency security, which may include maximum loan balance, loan vintage, loan-to-value ratio, geography and other characteristics as may be appropriate. The pricing sources may also utilize discounted cash flow model-derived pricing techniques to estimate the fair value of investment securities. Such models incorporate market-based discount rate assumptions based on observable inputs such as recent trading activity, credit data, volatility statistics, benchmark interest rate curves and other market data that are current as of the measurement date and may include certain unobservable inputs, such as assumptions of future levels of prepayment, defaults and loss severities. We review the pricing estimates obtained from the pricing sources and perform procedures to validate their reasonableness. Refer to Note 8 for further discussion of fair value measurements.
We evaluate our investments designated as available-for-sale for other-than-temporary impairment ("OTTI") on at least a quarterly basis. The determination of whether a security is other-than-temporarily impaired may involve judgments and assumptions based on subjective and objective factors. When a security is impaired, an OTTI is considered to have occurred if any one of the following three conditions exists as of the financial reporting date: (i) we intend to sell the security (that is, a decision has been made to sell the security), (ii) it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis or (iii) we do not expect to recover the security's amortized cost basis, even if we do not intend to sell the security and it is not more likely than not that we will be required to sell the security. A general allowance for unidentified impairments in a portfolio of securities is not permitted.


Interest Income
Interest income is accrued based on the outstanding principal amount of the investment securities and their contractual terms. Premiums or discounts associated with the purchase of Agency RMBS and non-Agency MBS of high credit quality are amortized or accreted into interest income, respectively, over the projected lives of the securities, including contractual payments and estimated prepayments, using the effective interest method in accordance with ASC Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs.
We estimate long-term prepayment speeds of our mortgage securities using a third-party service and market data. The third-party service provider estimates prepayment speeds using models that incorporate the forward yield curve, current mortgage rates, mortgage rates of the outstanding loans, age and size of the outstanding loans, loan-to-value ratios, interest rate volatility and other factors. We review the prepayment speeds estimated by the third-party service and compare the results to market consensus prepayment speeds, if available. We also consider historical prepayment speeds and current market conditions to validate the reasonableness of the third-party estimates and, based on our judgment, we may adjust the estimates. We review our actual and anticipated prepayment experience on at least a quarterly basis and effective yields are recalculated when differences arise between (i) our previously estimated future prepayments and (ii) actual prepayments to date and our current estimated future prepayments. If the actual and estimated future prepayment experience differs from our prior estimate of prepayments, we are required to record an adjustment in the current period to the amortization or accretion of premiums and discounts for the cumulative difference in the effective yield through the reporting date.


At the time we purchase CRT securities and non-Agency MBS that are not of high credit quality, we determine an effective yield based on our estimate of the timing and amount of future cash flows and our cost basis. Our initial cash flow estimates for these investments are based on our observations of current information and events and include assumptions related to interest rates, prepayment rates and the impact of default and severity rates on the timing and amount of credit losses. On at least a quarterly basis, we review the estimated cash flows and make appropriate adjustments based on inputs and analysis received from external sources, internal models, and our judgment regarding such inputs and other factors. Any resulting changes in effective yield are recognized prospectively based on the current amortized cost of the investment as adjusted for credit impairment,impairments, if any.
Repurchase Agreements
We finance the acquisition of securities for our investment portfolio primarily through repurchase transactions under master repurchase agreements. Pursuant to ASC Topic 860, Transfers and Servicing, we account for repurchase transactions as collateralized financing transactions, which are carried at their contractual amounts (cost), plus accrued interest. Our repurchase agreements typically have maturities of less than one year but may extend up to five years or more. Interest rates on our repurchase agreements generally correspond to one or three-month LIBOR plus or minus a fixed spread. The fair value of our repurchase agreements is assumed to equal cost as the interest rates are considered to be at market.
Reverse Repurchase Agreements and Obligation to Return Securities Borrowed under Reverse Repurchase Agreements
We borrow securities to cover short sales of U.S. Treasury securities through reverse repurchase transactions under our master repurchase agreements (see Derivative Instruments below). We account for these as securities borrowing transactions and recognize an obligation to return the borrowed securities at fair value on the balance sheet based on the value of the underlying borrowed securities as of the reporting date. Our reverse repurchase agreements typically have maturities of 30 days or less. The fair value of our reverse repurchase agreements is assumed to equal cost as the interest rates generally reset daily.are considered to be at market.
Derivative Instruments
We use a variety of derivative instruments to hedge a portion of our exposure to market risks, including interest rate, prepayment, extension and liquidity risks. The objective of our risk management strategy is to reduce fluctuations in net book value over a range of interest rate scenarios. In particular, we attempt to mitigate the risk of the cost of our variable rate liabilities increasing during a period of rising interest rates. The primary instruments that we use are interest rate swaps, options to enter into interest rate swaps ("swaptions"), U.S. Treasury securities and U.S. Treasury futures contracts. We also use forward contracts in the Agency RMBS "to-be-announced" market, or TBA securities, to invest in and finance Agency securities as well as to periodically reduce our exposure to Agency RMBS.
We account for derivative instruments in accordance with ASC Topic 815, Derivatives and Hedging ("ASC 815"). ASC 815 requires an entity to recognize all derivatives as either assets or liabilities in our accompanying consolidated balance sheets and to measure those instruments at fair value. None of our derivative instruments have been designated as hedging instruments for accounting purposes under the provisions of ASC 815, consequently changes in the fair value of our derivative instruments are reported in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income.
Our derivative agreements generally contain provisions that allow for netting or setting off derivative assets and liabilities with the counterparty; however, we report related assets and liabilities on a gross basis in our consolidated balance sheets. Derivative


instruments in a gain position are reported as derivative assets at fair value and derivative instruments in a loss position are reported as derivative liabilities at fair value in our consolidated balance sheets. Changes in fair value of derivative instruments and periodic settlements related to our derivative instruments are recorded in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income. Cash receipts and payments related to derivative instruments are classified in our consolidated statements of cash flows according to the underlying nature or purpose of the derivative transaction, generally in the investing section.
The use of derivative instruments creates exposure to credit risk relating to potential losses that could be recognized if the counterparties to these instruments fail to perform their obligations under the contracts. Our derivative agreements require that we post or receive collateral to mitigate such risk. We also attempt to minimize our risk of loss by limiting our counterparties to registered central clearing exchanges and major financial institutions with acceptable credit ratings, monitoring positions with individual counterparties and adjusting posted collateral as required.
Interest rate swap agreements
We use interest rate swaps to economically hedge the variable cash flows associated with our borrowings made under repurchase agreements. Under our interest rate swap agreements, we typically pay a fixed rate and receive a floating rate based


on one or three-month LIBOR ("payer swaps") with terms up to 20 years. Our swap agreements are privately negotiated in the over-the-counter ("OTC") market.
The majority of our interest rate swaps are centrally cleared through a registered commodities exchange. We value centrally cleared interest rate swaps using the daily settlement price, or fair value, determined by the clearing exchange based on a pricing model that references observable market inputs, including LIBOR, swap rates and the forward yield curve. Our centrally cleared swaps require that we post an "initial margin" amount determined by the clearing exchange, which is generally intended to be set at a level sufficient to protect the exchange from the interest rate swap's maximum estimated single-day price movement. We also exchange daily settlements of "variation margin" based upon changes in fair value, as measured by the exchange. Pursuant to rules governing central clearing activities, we recognize variation margin settlements as a direct reduction of the carrying value of the interest rate swap asset or liability.
We value non-centrally cleared swaps using a combination of third-party valuations obtained from pricing services and the swap counterparty. The third-party valuations are model-driven using observable inputs, including LIBOR, swap rates and the forward yield curve. We also consider both our own and our counterparties' nonperformance risk in estimating the fair value of our interest rate swaps. In considering the effect of nonperformance risk, we assess the impact of netting and credit enhancements, such as collateral postings and guarantees, and have concluded that our own and our counterparty risk is not significant to the overall valuation of these agreements.
Interest rate swaptions
We purchase interest rate swaptions to help mitigate the potential impact of larger, more rapid changes in interest rates on the performance of our investment portfolio. Interest rate swaptions provide us the option to enter into an interest rate swap agreement for a predetermined notional amount, stated term and pay and receive interest rates in the future. Our swaption agreements typically provide us the option to enter into a pay-fixed rate interest rate swap ("payer swaptions"). We may also enter into swaption agreements that provide us the option to enter into a receive-fixed interest rate swap ("receiver swaptions").
Our interest rate swaption agreements are privately negotiated in the OTC market and are not subject to central clearing. The premium paid for interest rate swaptions is reported as an asset in our consolidated balance sheets. We estimate the fair value of interest rate swaptions using a combination of inputs from counterparty and third-party pricing models based on the fair value of the future interest rate swap that we have the option to enter into as well as the remaining length of time that we have to exercise the option, adjusted for non-performance risk, if any. The difference between the premium paid and the fair value of the swaption is reported in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income. If a swaption expires unexercised, the realized loss on the swaption would be equal to the premium paid. If we sell or exercise a swaption, the realized gain or loss on the swaption would be equal to the difference between the cash or the fair value of the underlying interest rate swap received and the premium paid.
TBA securities
A TBA security is a forward contract for the purchase or sale of Agency RMBS at a predetermined price, face amount, issuer, coupon and stated maturity on an agreed-upon future date. The specific Agency RMBS to be delivered into the contract are not known until shortly before the settlement date. We may choose, prior to settlement, to move the settlement of these securities out to a later date by entering into an offsetting TBA position, net settling the offsetting positions for cash, and simultaneously purchasing or selling a similar TBA contract for a later settlement date (together referred to as a "dollar roll transaction"). The Agency securities


purchased or sold for a forward settlement date are typically priced at a discount to equivalent securities settling in the current month. This difference, or "price drop," is the economic equivalent toof interest income on the underlying Agency securities, less an implied funding cost, over the forward settlement period (referred to as "dollar roll income"). Consequently, forward purchases of Agency securities and dollar roll transactions represent a form of off-balance sheet financing.
We account for TBA contracts as derivative instruments since either the TBA contracts do not settle in the shortest period of time possible or we cannot assert that it is probable at inception and throughout the term of the TBA contract that we will physically settle the TBA contract on the settlement date. We account for TBA dollar roll transactions as a series of derivative transactions. Gains, losses and dollar roll income associated with our TBA contracts are recognized in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income. We estimate the fair value of TBA securities based on similar methods used to value our Agency RMBS securities.
U.S. Treasury securities
We purchase and sell shortuse U.S. Treasury securities and U.S. Treasury futures contracts to help mitigate the potential impact of changes in interest rates on the performance of our portfolio. We borrow U.S. Treasury securities under reverse repurchase agreements to cover short sales of U.S. Treasury securities under reverse repurchase agreements.securities. We account for these as securities borrowing transactions and recognize an obligation to return the borrowed securities at fair value on our accompanying consolidated balance sheets based on the value of the underlying borrowed securitiesU.S. Treasury security as of the reporting date. Gains and losses associated with purchases and short sales of U.S. Treasury securities and U.S. Treasury futures contracts are recognized in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income.
Loss Contingencies
We evaluate the existence of any pending or threatened litigation or other potential claims against the Company in accordance with ASC Topic 450, Contingencies, which requires that we assess the likelihood and range of potential outcomes of any such


matters. We are the defendant in three stockholder derivative lawsuits alleging that certain of our current and former directors and officers breached fiduciary duties and wasted corporate assets relating to past renewals of the management agreement with our former external manager and the internalization of our management which occurred on July 1, 2016. Although the outcomes of these cases cannot be predicted with certainty, we do not believe that these cases have merit or will result in a material liability, and, as of March 31, 2018,2019, we did not accrue a loss contingency related to these matters.
Recent Accounting Pronouncements
We consider the applicability and impact of all Accounting Standards Updates ("ASUs") issued by the Financial Accounting Standards Board. ASUs not listed below were determined to be either not applicable, are not expected to have a significant impact on our consolidated financial statements when adopted or did not have a significant impact on our consolidated financial statements upon adoption.
ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. Allowances for credit losses on available-for-sale debt securities will be recognized, rather than direct reductions in the amortized cost of the investments. The new model also requires the estimation of lifetime expected credit losses and corresponding recognition of allowance for losses on trade and other receivables, held-to-maturity debt securities, loans, and other instruments held at amortized cost. The ASU requires certain recurring disclosures and is effective for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2019, with early adoption permitted for annual periods, and interim periods within those annual periods, beginning on or after December 15, 2018. ASU 2016-13 is not expected to have a significant impact on our consolidated financial statements.


Note 4. Investment Securities
As of March 31, 20182019 and December 31, 2017,2018, our investment portfolio consisted of $55.7$95.3 billion and $57.1$84.3 billion of investment securities, at fair value, respectively, and $13.6$7.0 billion and $15.7$7.3 billion of TBA securities, at fair value, respectively. Our TBA position is reported at its net carrying value of $82$70 million and $3$70 million as of March 31, 20182019 and December 31, 2017,2018, respectively, in derivative assets / (liabilities) on our accompanying consolidated balance sheets. The net carrying value of our TBA position represents the difference between the fair value of the underlying Agency security in the TBA contract and the cost basis or the forward price to be paid or received for the underlying Agency security.
As of March 31, 20182019 and December 31, 2017,2018, our investment securities had a net unamortized premium balance of $2.6$3.0 billion and $2.7$2.9 billion, respectively, including interest and principal-only securities.


respectively.
The following tables summarize our investment securities as of March 31, 20182019 and December 31, 2017,2018, excluding TBA securities, (dollars in millions). Details of our TBA securities as of each of the respective dates are included in Note 6.
  March 31, 2019 December 31, 2018
Investment Securities 
Amortized
Cost
 Fair Value Amortized
Cost
 Fair Value
Agency RMBS:        
Fixed rate $92,374
 $92,502
 $83,047
 $81,753
Adjustable rate 199
 201
 212
 213
CMO 555
 555
 588
 583
Interest-only and principal-only strips 166
 179
 172
 178
Multifamily 31
 32
 
 
Total Agency RMBS 93,325
 93,469
 84,019
 82,727
Non-Agency RMBS 313
 319
 264
 266
CMBS 343
 353
 280
 282
CRT securities 1,109
 1,129
 1,006
 1,012
Total investment securities $95,090
 $95,270
 $85,569
 $84,287

  March 31, 2018 December 31, 2017
Investment Securities 
Amortized
Cost
 Fair Value Amortized
Cost
 Fair Value
Agency RMBS:        
Fixed rate $55,266
 $53,696
 $55,477
 $55,026
Adjustable rate 265
 268
 278
 283
CMO 595
 590
 629
 631
Interest-only and principal-only strips 202
 208
 213
 228
Total Agency RMBS 56,328
 54,762
 56,597
 56,168
Non-Agency RMBS 7
 7
 7
 7
CMBS 28
 29
 28
 29
CRT securities 848
 884
 834
 876
Total investment securities $57,211
 $55,682
 $57,466
 $57,080


  March 31, 2019
  Agency RMBS Non-Agency    
Investment Securities Fannie Mae Freddie Mac 
Ginnie
Mae
 RMBS CMBS CRT Total
Available-for-sale securities:              
Par value $16,709
 $5,493
 $23
 $6
 $
 $
 $22,231
Unamortized discount (11) (2) 
 
 
 
 (13)
Unamortized premium 849
 325
 
 
 
 
 1,174
Amortized cost 17,547
 5,816
 23
 6
 
 
 23,392
Gross unrealized gains 19
 5
 1
 
 
 
 25
Gross unrealized losses (402) (166) 
 
 
 
 (568)
Total available-for-sale securities, at fair value 17,164
 5,655
 24
 6
 
 
 22,849
Securities remeasured at fair value through earnings:              
Par value 42,546
 25,501
 
 317
 409
 1,087
 69,860
Unamortized discount (74) (6) 
 (11) (70) (13) (174)
Unamortized premium 1,138
 834
 
 
 5
 35
 2,012
Amortized cost 43,610
 26,329
 
 306
 344
 1,109
 71,698
Gross unrealized gains 620
 340
 
 7
 10
 22
 999
Gross unrealized losses (172) (101) 
 
 (1) (2) (276)
Total securities remeasured at fair value through earnings 44,058
 26,568
 
 313
 353
 1,129
 72,421
Total securities, at fair value $61,222
 $32,223
 $24
 $319
 $353
 $1,129
 $95,270
Weighted average coupon as of March 31, 2019 3.83% 3.92% 3.72% 3.86% 4.65% 5.69% 3.88%
Weighted average yield as of March 31, 2019 1
 3.24% 3.30% 2.06% 4.22% 4.61% 4.75% 3.29%
  March 31, 2018
  Agency RMBS Non-Agency    
Investment Securities Fannie Mae Freddie Mac 
Ginnie
Mae
 RMBS CMBS CRT Total
Available-for-sale securities:              
Par value $22,893
 $7,430
 $32
 $7
 $
 $
 $30,362
Unamortized discount (24) (3) 
 
 
 
 (27)
Unamortized premium 1,083
 414
 
 
 
 
 1,497
Amortized cost 23,952
 7,841
 32
 7
 
 
 31,832
Gross unrealized gains 13
 6
 1
 
 
 
 20
Gross unrealized losses (713) (273) 
 
 
 
 (986)
Total available-for-sale securities, at fair value 23,252
 7,574
 33
 7
 
 
 30,866
Securities remeasured at fair value through earnings:              
Par value 13,472
 9,948
 
 
 29
 814
 24,263
Unamortized discount (33) (2) 
 
 (1) (1) (37)
Unamortized premium 672
 446
 
 
 
 35
 1,153
Amortized cost 14,111
 10,392
 
 
 28
 848
 25,379
Gross unrealized gains 11
 5
 
 
 1
 37
 54
Gross unrealized losses (360) (256) 
 
 
 (1) (617)
Total securities remeasured at fair value through earnings 13,762
 10,141
 
 
 29
 884
 24,816
Total securities, at fair value $37,014
 $17,715
 $33
 $7
 $29
 $884
 $55,682
Weighted average coupon as of March 31, 2018 3.66% 3.69% 2.87% 2.50% 6.55% 5.50% 3.70%
Weighted average yield as of March 31, 2018 1
 2.88% 2.93% 2.02% 3.03% 7.36% 5.51% 2.93%

 ________________________________
1.
Incorporates a weighted average future constant prepayment rate assumption of 7.6%10.5% based on forward rates as of March 31, 20182019.




  December 31, 2018
  Agency RMBS Non-Agency    
Investment Securities 
Fannie 
Mae
 Freddie Mac 
Ginnie 
Mae
 RMBS CMBS CRT Total
Available-for-sale securities:              
Par value $17,591
 $5,673
 $25
 $6
 $
 $
 $23,295
Unamortized discount (10) (2) 
 
 
 
 (12)
Unamortized premium 912
 343
 
 
 
 
 1,255
Amortized cost 18,493
 6,014
 25
 6
 
 
 24,538
Gross unrealized gains 4
 2
 1
 
 
 
 7
Gross unrealized losses (686) (264) 
 
 
 
 (950)
Total available-for-sale securities, at fair value 17,811
 5,752
 26
 6
 
 
 23,595
Securities remeasured at fair value through earnings:              
Par value 39,453
 18,428
 
 268
 281
 968
 59,398
Unamortized discount (78) (9) 
 (10) (6) 
 (103)
Unamortized premium 1,055
 638
 
 
 5
 38
 1,736
Amortized cost 40,430
 19,057
 
 258
 280
 1,006
 61,031
Gross unrealized gains 223
 57
 
 2
 3
 18
 303
Gross unrealized losses (386) (243) 
 
 (1) (12) (642)
Total securities remeasured at fair value through earnings 40,267
 18,871
 
 260
 282
 1,012
 60,692
Total securities, at fair value $58,078
 $24,623
 $26
 $266
 $282
 $1,012
 $84,287
Weighted average coupon as of December 31, 2018 3.82% 3.87% 3.37% 3.83% 4.58% 5.86% 3.86%
Weighted average yield as of December 31, 2018 1
 3.28% 3.28% 2.04% 4.22% 4.68% 5.16% 3.31%
  December 31, 2017
  Agency RMBS Non-Agency    
Investment Securities 
Fannie 
Mae
 Freddie Mac 
Ginnie 
Mae
 RMBS CMBS CRT Total
Available-for-sale securities:              
Par value $24,200
 $8,219
 $34
 $7
 $
 $
 $32,460
Unamortized discount (25) (3) 
 
 
 
 (28)
Unamortized premium 1,119
 447
 
 
 
 
 1,566
Amortized cost 25,294
 8,663
 34
 7
 
 
 33,998
Gross unrealized gains 98
 22
 1
 
 
 
 121
Gross unrealized losses (325) (141) 
 
 
 
 (466)
Total available-for-sale securities, at fair value 25,067
 8,544
 35
 7
 
 
 33,653
Securities remeasured at fair value through earnings:              
Par value 13,558
 7,956
 
 
 29
 801
 22,344
Unamortized discount (34) 
 
 
 (1) 
 (35)
Unamortized premium 711
 415
 
 
 
 33
 1,159
Amortized cost 14,235
 8,371
 
 
 28
 834
 23,468
Gross unrealized gains 26
 2
 
 
 1
 42
 71
Gross unrealized losses (70) (42) 
 
 
 
 (112)
Total securities remeasured at fair value through earnings 14,191
 8,331
 
 
 29
 876
 23,427
Total securities, at fair value $39,258
 $16,875
 $35
 $7
 $29
 $876
 $57,080
Weighted average coupon as of December 31, 2017 3.67% 3.73% 2.84% 2.50% 6.55% 5.26% 3.71%
Weighted average yield as of December 31, 2017 1
 2.84% 2.87% 2.02% 3.08% 7.30% 5.19% 2.89%

 ________________________________
1.Incorporates a weighted average future constant prepayment rate assumption of 8.4%7.9% based on forward rates as of December 31, 2017.2018.


As of March 31, 20182019 and December 31, 2017,2018, our investments in CRT and non-Agency securities had the following credit ratings:
 March 31, 2018 December 31, 2017 March 31, 2019 December 31, 2018
CRT and Non-Agency Security Credit Ratings 1
 CRT RMBS CMBS CRT RMBS CMBS CRT RMBS CMBS CRT RMBS CMBS
AAA $
 $7
 $
 $
 $7
 $
 $
 $156
 $62
 $
 $160
 $52
AA 
 42
 190
 
 17
 152
A 17
 45
 33
 17
 33
 15
BBB 26
 
 29
 20
 
 29
 54
 63
 58
 25
 43
 53
BB 139
 
 
 136
 
 
 412
 8
 10
 492
 8
 10
B 698
 
 
 691
 
 
 600
 2
 
 453
 2
 
Not Rated 21
 
 
 29
 
 
 46
 3
 
 25
 3
 
Total $884
 $7
 $29
 $876
 $7
 $29
 $1,129
 $319
 $353
 $1,012
 $266
 $282
 ________________________________
1.Represents the lowest of Standard and Poor's ("S&P"), Moody's, Fitch, DBRS, Kroll Bond Rating Agency ("KBRA") and FitchMorningstar credit ratings, stated in terms of the S&P equivalent rating as of each date.

Our CRT securities reference the performance of loans underlying Agency RMBS issued by Fannie Mae or Freddie Mac, which were subject to their underwriting standards. As of March 31, 2018,2019, our CRT securities had floating and fixed rate coupons ranging from 3.7%3.0% to 8.8%, referenced to loans originated between 20122011 and 2018 with weighted average coupons ranging from 3.6%3.7% to 4.4%4.9%. As of December 31, 2017,2018, our CRT securities had floating rate coupons ranging from 3.9% to 8.5%9.5%, referenced to loans originated between 20122011 and 20172018 with weighted average coupons ranging from 3.6%3.8% to 4.4%4.8%.

The actual maturities of our investment securities are generally shorter than their stated contractual maturities. ActualThe actual maturities of our Agency and high credit quality non-Agency RMBS are primarily affected by principal prepayments and to a lesser degree the contractual lives of the underlying mortgages and periodic contractual principal paymentsrepayments. The actual maturities of our credit-oriented investments are primarily impacted by their contractual lives and principal prepayments.default and loss recovery rates. As of March 31, 20182019 and December 31, 2017,2018, the weighted average expected constant prepayment rate ("CPR") over the remaining life of our aggregateAgency and high credit quality non-Agency RMBS investment portfolio was 7.6%10.5% and 8.4%7.9%, respectively. Our estimates can differ materially for different securities and thus our individual holdings have a wide range of projected CPRs. The following table summarizes our investments as of March 31, 20182019 and December 31, 20172018 according to their estimated weighted average life classification (dollars in millions):




  March 31, 2019 December 31, 2018
Estimated Weighted Average Life of Investment Securities Fair Value 
Amortized
Cost
 
Weighted
Average
Coupon
 
Weighted
Average
Yield
 Fair Value 
Amortized
Cost
 
Weighted
Average
Coupon
 
Weighted
Average
Yield
≥ 1 year and ≤ 3 years $2,452
 $2,461
 3.94% 2.83% $1,690
 $1,716
 3.99% 2.64%
> 3 years and ≤ 5 years 18,438
 18,225
 3.85% 3.35% 5,518
 5,586
 3.35% 2.73%
> 5 years and ≤10 years 74,329
 74,354
 3.89% 3.29% 72,503
 73,588
 3.92% 3.37%
> 10 years 51
 50
 3.78% 4.12% 4,576
 4,679
 3.57% 3.30%
Total $95,270
 $95,090
 3.88% 3.29% $84,287
 $85,569
 3.86% 3.31%

  March 31, 2018 December 31, 2017
Estimated Weighted Average Life of Investment Securities Fair Value 
Amortized
Cost
 
Weighted
Average
Coupon
 
Weighted
Average
Yield
 Fair Value 
Amortized
Cost
 
Weighted
Average
Coupon
 
Weighted
Average
Yield
≥ 1 year and ≤ 3 years $2,671
 $2,683
 3.91% 2.61% $2,712
 $2,693
 3.90% 2.67%
> 3 years and ≤ 5 years 6,283
 6,395
 3.23% 2.36% 7,499
 7,518
 3.31% 2.39%
> 5 years and ≤10 years 42,171
 43,513
 3.75% 2.98% 45,977
 46,398
 3.75% 2.95%
> 10 years 4,557
 4,620
 3.79% 3.52% 892
 857
 4.87% 4.74%
Total $55,682
 $57,211
 3.70% 2.93% $57,080
 $57,466
 3.71% 2.89%

The following table presents the gross unrealized loss and fair values of securities classified as available-for-sale by length of time that such securities have been in a continuous unrealized loss position as of March 31, 20182019 and December 31, 20172018 (in millions):
  Unrealized Loss Position For
  Less than 12 Months 12 Months or More Total
Securities Classified as Available-for-Sale 
Fair
Value
 
Unrealized
Loss
 

Fair Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
March 31, 2018 $9,782
 $(133) $18,946
 $(853) $28,728
 $(986)
December 31, 2017 $3,582
 $(15) $20,577
 $(451) $24,159
 $(466)

  Unrealized Loss Position For
  Less than 12 Months 12 Months or More Total
Securities Classified as Available-for-Sale 
Fair
Value
 
Unrealized
Loss
 

Fair Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
March 31, 2019 $108
 $(1) $20,119
 $(567) $20,227
 $(568)
December 31, 2018 $4,783
 $(72) $18,231
 $(878) $23,014
 $(950)
We did not recognize OTTI charges on our investment securities forduring the three months ended March 31, 2018 and 2017.periods presented on our consolidated statements of operations. As of the end of each respective reporting period, a decision had not been made to sell any of our securities in an unrealized loss position and we did not believe it was more likely than not that we would be required to sell such securities before recovery of their amortized cost basis. The unrealized losses on our securities were not due to credit losses given the GSE or U.S. Government


agency guarantees, but rather were due to changes in interest rates and prepayment expectations. However, as we continue to actively manage our portfolio, we may recognize additional realized losses on our investment securities upon selecting specific securities to sell.

Gains and Losses on Sale of Investment Securities

The following table is a summary of our net gain (loss) from the sale of investment securities for the three months ended March 31, 20182019 and 20172018 by investment classification of accounting (in millions):
 Three Months Ended March 31, Three Months Ended March 31,
 2018 2017 2019 2018
Investment Securities 
Available-for-Sale
Securities 2
Fair Value Option SecuritiesTotal 
Available-for-Sale
Securities 2
Fair Value Option SecuritiesTotal 
Available-for-Sale
Securities 2
 Fair Value Option Securities Total 
Available-for-Sale
Securities 2
 Fair Value Option Securities Total
Investment securities sold, at cost $(387)$(1,003)$(1,390) $(5,149)$(219)$(5,368) $(339) $(4,562) $(4,901) $(387) $(1,003) $(1,390)
Proceeds from investment securities sold 1
 388
1,000
1,388
 5,065
219
5,284
 335
 4,626
 4,961
 388
 1,000
 1,388
Net gain (loss) on sale of investment securities $1
$(3)$(2) $(84)$
$(84) $(4) $64
 $60
 $1
 $(3) $(2)
                
Gross gain on sale of investment securities $3
$7
$10
 $4
$
$4
 $
 $66
 $66
 $3
 $7
 $10
Gross loss on sale of investment securities (2)(10)(12) (88)
(88) (4) (2) (6) (2) (10) (12)
Net gain (loss) on sale of investment securities $1
$(3)$(2) $(84)$
$(84) $(4) $64
 $60
 $1
 $(3) $(2)
  ________________________________
1.Proceeds include cash received during the period, plus receivable for investment securities sold during the period as of period end.
2.See Note 10 for a summary of changes in accumulated OCI.  
Securitizations andConsolidated Variable Interest Entities
As of March 31, 20182019 and December 31, 2017, we held investments in CMO trusts, which are VIEs. We have consolidated certain of these CMO trusts in2018, our consolidated financial statements wherereflect the consolidation of certain variable interest entities ("VIEs") for which we have determined we are the primary beneficiarybeneficiary. The consolidated VIEs consist of the trusts. All of our CMO securities aretrusts backed by fixed or adjustable-rate Agency RMBS. Fannie Mae or Freddie Mac guarantees the payment of interest and principal and acts as the trustee and administrator of their respective securitization trusts. Accordingly, we are not required to provide the beneficial interest holders of the CMO securities any financial or other support.


Our maximum exposure to loss related to our involvement with the CMO trusts is the fair value of the CMO securities and interest and principal-only securities held by us, less principal amounts guaranteed by Fannie Mae and Freddie Mac.
In connection with our consolidated CMO trusts, we recognized Agency securities with a total fair value and approximate unpaid principal balance of $0.6 billion and $0.7 billion as of March 31, 2018 and December 31, 2017, respectively, and debt with a total fair value and approximate unpaid principal balance of $0.3 billion and $0.4 billion, respectively, in our accompanying consolidated balance sheets. We re-measure our consolidated debt at fair value through earnings in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income. Our involvement with the consolidated trusts is limited to the Agency securities transferred by us upon the formation of the trusts and the CMO securities subsequently held by us. There are no arrangements that could require us to provide financial support to the trusts.
As of March 31, 2018 and December 31, 2017, the fair value of our CMO securities and interest and principal-only securities was $0.8 billion and $0.9 billion, respectively, excluding the consolidated CMO trusts discussed above, or $1.1 billion and $1.2 billion, respectively, including the net asset value of our consolidated CMO trusts. Our maximum exposure to loss related to our CMO securities and interest and principal-only securities, including our consolidated CMO trusts, was $91 million and $124 million as of March 31, 2018 and December 31, 2017, respectively.


Note 5. Repurchase Agreements and Other Secured BorrowingsDebt
Repurchase Agreements
We pledge our securities as collateral under our borrowingborrowings structured as repurchase agreements with financial institutions. Interest rates on our borrowings are generally based on LIBOR plus or minus a margin and amounts available to be borrowed are dependent upon the fair value of the securities pledged as collateral, which fluctuates with changes in interest rates, type of security and liquidity conditions within the banking, mortgage finance and real estate industries. If the fair value of our pledged securities declines, lenders will typically require us to post additional collateral or pay down borrowings to re-establish agreed upon collateral requirements, referred to as "margin calls." Similarly, if the fair value of our pledged securities increases, lenders may release collateral back to us. As of March 31, 20182019, we had met all margin call requirements. For additional information regarding our pledged assets, please refer to Note 7.
Repurchase Agreements
As of March 31, 20182019 and December 31, 2017,2018, we had $49.0$86.7 billion and $50.3$75.7 billion, respectively, of repurchase agreements outstanding.outstanding used to fund our investment portfolio and temporary holdings of U.S. Treasury securities. The terms and conditions of our repurchase agreements are typically negotiated on a transaction-by-transaction basis. Our repurchase agreements with original maturities greater than one year have floating interest rates based on an index plus or minus a fixed spread. The following table summarizes our borrowings under repurchase agreements by their remaining maturities as of March 31, 20182019 and December 31, 20172018 (dollars in millions):


  March 31, 2019 December 31, 2018
Remaining Maturity Repurchase Agreements 
Weighted
Average
Interest
Rate
 
Weighted
Average Days
to Maturity
 Repurchase Agreements 
Weighted
Average
Interest
Rate
 
Weighted
Average Days
to Maturity
Agency repo:            
≤ 1 month $44,624
 2.94% 8
 $48,533
 2.88% 9
> 1 to ≤ 3 months 26,690
 2.66% 65
 20,991
 2.57% 56
> 3 to ≤ 6 months 2,181
 2.67% 125
 2,218
 2.65% 167
> 6 to ≤ 9 months 2,450
 2.68% 204
 200
 3.19% 208
> 9 to ≤ 12 months 7,554
 2.75% 288
 950
 2.80% 279
> 12 to ≤ 24 months 1,825
 2.97% 516
 2,200
 2.91% 438
> 24 to ≤ 36 months 1,000
 2.67% 1,044
 625
 3.11% 776
  Total Agency repo 86,324
 2.82% 81
 75,717
 2.79% 49
U.S. Treasury repo:            
> 1 day to ≤ 1 month 361
 2.91% 1
 
 % 
Total $86,685
 2.82% 81
 $75,717
 2.79% 49
  March 31, 2018 December 31, 2017
Remaining Maturity Repurchase Agreements 
Weighted
Average
Interest
Rate
 
Weighted
Average Days
to Maturity
 Repurchase Agreements 
Weighted
Average
Interest
Rate
 
Weighted
Average Days
to Maturity
Agency repo:            
≤ 1 month $24,939
 1.79% 14
 $19,771
 1.59% 11
> 1 to ≤ 3 months 12,881
 1.70% 57
 16,150
 1.50% 50
> 3 to ≤ 6 months 3,381
 1.76% 134
 7,287
 1.50% 130
> 6 to ≤ 9 months 485
 2.07% 214
 2,361
 1.66% 225
> 9 to ≤ 12 months 3,678
 1.96% 297
 202
 1.64% 297
> 12 to ≤ 24 months 2,267
 2.29% 596
 1,700
 1.84% 468
> 24 to ≤ 36 months 1,325
 2.26% 937
 2,200
 1.80% 803
> 36 to ≤ 48 months 
 % 
 625
 1.90% 1,141
Total Agency repo $48,956
 1.82% 109
 $50,296
 1.57% 116

As of March 31, 20182019 and December 31, 2017, $3.72018, $18.7 billion and $5.3$19.5 billion, respectively, of our Agency repurchase agreements matured overnighthad a remaining maturity of one business day and none of our repurchase agreements were due on demand. As of March 31, 2019, we had $10.7 billion of forward commitments to enter into repurchase agreements, with a weighted average forward start date of 85 days and a weighted average interest rate of 2.55%. As of December 31, 2018 we had $10.7 billion of forward commitments to enter into repurchase agreements, with a weighted average forward start date of 9 days and a weighted average interest rate of 2.90%. As of March 31, 2019 and December 31, 2018, 41% and 35%, respectively, of our repurchase agreement funding was sourced through our wholly-owned captive broker-dealer subsidiary, Bethesda Securities, LLC ("BES"). Amounts sourced through BES include funding from the General Collateral Finance Repo service ("GCF Repo") offered by the Fixed Income Clearing Corporation ("FICC"), which totaled 40% and 33% of our repurchase agreement funding outstanding as of March 31, 2019 and December 31, 2018, respectively.

Reverse Repurchase Agreements
As of March 31, 2019 and December 31, 2018, we had $20.4 billion and $21.8 billion, respectively, of reverse repurchase agreements outstanding used primarily to borrow securities to cover short sales of U.S. Treasury securities, for which we had associated obligations to return borrowed securities at fair value of $19.3 billion and $21.4 billion, respectively. As of March 31, 2019 and December 31, 2018, $5.6 billion and $4.5 billion, respectively, of our reverse repurchase agreements were with the FICC sourced through BES.
Other Debt
As of March 31, 2019 and December 31, 2018, we had debt of consolidated VIEs, at fair value, of $266 million and $275 million, respectively, which had a weighted average interest rate of LIBOR plus 41 and 40 basis points, respectively, and an estimated weighted average life of 5.9 years and 6.1 years, respectively.



Note 6. Derivative and Other Hedging Instruments
We hedge a portion of our interest rate risk by entering intoprimarily utilizing interest rate swaps, interest rate swaptions, and U.S. Treasury securities and U.S. Treasury futures contracts, primarily through short sales.contracts. We may also utilize TBA securities options and other typesprimarily as a means of derivative instruments to hedge a portion of our risk.investing in the Agency securities market. For additional information regarding our derivative instruments and our overall risk management strategy, please refer to the discussion of derivative and other hedging instruments in Note 3.


Derivative and Other Hedging Instrument Assets (Liabilities), at Fair Value
The table below summarizes fair value information about our derivative and other hedging instrument assets/(liabilities) as of March 31, 20182019 and December 31, 20172018 (in millions):
Derivative and Other Hedging Instruments Balance Sheet Location March 31, 2019 December 31, 2018
Interest rate swaps Derivative assets, at fair value $151
 $126
Swaptions Derivative assets, at fair value 11
 37
TBA securities Derivative assets, at fair value 91
 110
Total derivative assets, at fair value   $253
 $273
       
Interest rate swaps Derivative liabilities, at fair value $(1) $
TBA securities Derivative liabilities, at fair value (21) (40)
U.S. Treasury futures - short Derivative liabilities, at fair value (31) (44)
Total derivative liabilities, at fair value   $(53) $(84)
       
U.S. Treasury securities - long U.S. Treasury securities, at fair value $121
 $46
U.S. Treasury securities - short Obligation to return securities borrowed under reverse repurchase agreements, at fair value (19,275) (21,431)
Total U.S. Treasury securities, net at fair value   $(19,154) $(21,385)

Derivative and Other Hedging Instruments Balance Sheet Location March 31, 2018 December 31, 2017
Interest rate swaps Derivative assets, at fair value $174
 $81
Swaptions Derivative assets, at fair value 153
 75
TBA securities Derivative assets, at fair value 83
 30
U.S. Treasury futures - short Derivative assets, at fair value 
 19
Total derivative assets, at fair value   $410
 $205
       
Interest rate swaps Derivative liabilities, at fair value $(1) $(1)
TBA securities Derivative liabilities, at fair value (1) (27)
U.S. Treasury futures - short Derivative liabilities, at fair value (30) 
Total derivative liabilities, at fair value   $(32) $(28)
       
U.S. Treasury securities - long U.S. Treasury securities, at fair value $224
 $
U.S. Treasury securities - short Obligation to return securities borrowed under reverse repurchase agreements, at fair value (10,352) (10,467)
Total U.S. Treasury securities, net at fair value   $(10,128) $(10,467)


The following tables summarize certain characteristics of our derivative and other hedging instruments outstanding as of March 31, 20182019 and December 31, 20172018 (dollars in millions):
  March 31, 2019 December 31, 2018
Interest Rate Swaps 
Notional
Amount
1
 
Average
Fixed Pay 
Rate 2
 Average
Receive
Rate
 Average
Maturity
(Years)
 
Notional
Amount
1
 
Average
Fixed Pay 
Rate 2
 Average
Receive
Rate
 Average
Maturity
(Years)
≤ 3 years $20,900
 1.71% 2.69% 1.2 $19,900
 1.63% 2.62% 1.3
> 3 to ≤ 5 years 9,425
 2.11% 2.69% 3.7 8,425
 2.06% 2.61% 4.0
> 5 to ≤ 7 years 6,225
 2.38% 2.67% 5.8 7,875
 2.66% 2.66% 6.1
> 7 to ≤ 10 years 9,700
 2.30% 2.68% 8.6 10,550
 2.36% 2.64% 8.8
> 10 years 1,925
 2.30% 2.69% 13.2 4,875
 2.77% 2.63% 11.6
Total $48,175
 2.01% 2.69% 4.3 $51,625
 2.11% 2.63% 5.0
  March 31, 2018 December 31, 2017
Interest Rate Swaps 
Notional
Amount
1
 
Average
Fixed Pay 
Rate 2
 Average
Receive
Rate
 Average
Maturity
(Years)
 
Notional
Amount
1
 
Average
Fixed Pay 
Rate 2
 Average
Receive
Rate
 Average
Maturity
(Years)
≤ 3 years $21,075
 1.51% 1.90% 1.5 $21,025
 1.40% 1.46% 1.5
> 3 to ≤ 5 years 8,375
 1.84% 1.87% 4.1 6,825
 1.82% 1.43% 4.1
> 5 to ≤ 7 years 5,075
 2.16% 1.96% 6.0 5,775
 2.02% 1.44% 5.9
> 7 to ≤ 10 years 7,550
 2.17% 1.88% 8.9 6,650
 2.10% 1.42% 9.1
> 10 years 3,175
 2.49% 1.91% 12.9 3,425
 2.49% 1.45% 12.9
Total $45,250
 1.82% 1.90% 4.5 $43,700
 1.74% 1.44% 4.5

1.As of March 31, 20182019 and December 31, 2017,2018, notional amount includes forward starting swaps of $2.5$4.0 billion and $4.6$5.7 billion, respectively, with an average forward start date of 0.40.2 and 0.30.5 years, respectively.
2.Average fixed pay rate includes forward starting swaps. Excluding forward starting swaps, the average fixed pay rate was 1.77%1.96% and 1.68%1.98% as of March 31, 20182019 and December 31, 2017,2018, respectively.



Swaptions Option Underlying Payer Swap
Current Option Expiration Date Cost Basis Fair Value 
Average
Months to Current Option
Expiration Date 1
 
Notional
Amount
 
Average Fixed Pay
Rate
 
Average
Receive
Rate
(LIBOR)
 
Average
Term
(Years)
March 31, 2019              
≤ 1 year $71
 $5
 4 $2,050
 2.98% 3M 7.0
> 1 year ≤ 2 years 18
 6
 15 500
 2.78% 3M 10.0
Total $89
 $11
 7 $2,550
 2.94% 3M 7.6
               
December 31, 2018              
≤ 1 year $80
 $23
 4 $3,000
 2.96% 3M 7.0
> 1 year ≤ 2 years 18
 14
 18 500
 2.78% 3M 10.0
Total $98
 $37
 6 $3,500
 2.93% 3M 7.4
Swaptions Option Underlying Payer Swap
Current Option Expiration Date Cost Basis Fair Value 
Average
Months to Current Option
Expiration Date 1
 
Notional
Amount
 
Average Fixed Pay
Rate
 
Average
Receive
Rate
(LIBOR)
 
Average
Term
(Years)
March 31, 2018              
≤ 1 year $110
 $104
 7 $5,050
 2.74% 3M 8.0
> 1 year ≤ 2 years 24
 29
 16 1,200
 2.83% 3M 8.1
> 2 year ≤ 3 years 18
 20
 27 500
 2.78% 3M 10.0
Total $152
 $153
 10 $6,750
 2.76% 3M 8.2
December 31, 2017              
≤ 1 year $118
 $46
 7 $5,100
 2.71% 3M 8.8
> 1 year ≤ 2 years 23
 16
 18 1,050
 2.71% 3M 8.7
> 2 year ≤ 3 years 18
 13
 30 500
 2.78% 3M 10.0
Total $159
 $75
 10 $6,650
 2.72% 3M 8.9

1.As of March 31, 20182019 and December 31, 2017,2018, ≤ 1 year notional amount includes $700 million of Bermudan swaptions where the options may be exercised on predetermined dates up to their final exercise date, which is six months prior to the underlying swaps' maturity date.
U.S. Treasury Securities March 31, 2019 December 31, 2018
Maturity Face Amount (Short) 
Cost Basis 1
 Fair Value Face Amount (Short) 
Cost Basis 1
 Fair Value
5 years $120
 $120
 $121
 $(703) $(706) $(713)
7 years (12,990) (12,976) (13,285) (14,357) (14,325) (14,410)
10 years (5,745) (5,810) (5,990) (6,240) (6,224) (6,262)
Total U.S. Treasury securities $(18,615) $(18,666) $(19,154) $(21,300) $(21,255) $(21,385)

U.S. Treasury Securities March 31, 2018 December 31, 2017
Maturity Face Amount Net Long / (Short) Cost Basis Fair Value Face Amount Net Long / (Short) Cost Basis Fair Value
5 years $50
 $50
 $54
 $(288) $(286) $(283)
7 years (6,451) (6,419) (6,235) (6,131) (6,106) (6,029)
10 years (4,172) (4,122) (3,947) (4,280) (4,230) (4,155)
Total U.S. Treasury securities, net $(10,573) $(10,491) $(10,128) $(10,699) $(10,622) $(10,467)

1.As of March 31, 2019 and December 31, 2018, U.S. Treasury securities had a weighted average yield of 2.66%.
 U.S. Treasury Futures March 31, 2019 December 31, 2018
Maturity 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
10 years $(1,650) $(2,019) $(2,050) $(31) $(1,650) $(1,969) $(2,013) $(44)
 U.S. Treasury Futures March 31, 2018 December 31, 2017
Maturity 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
5 years $(730) $(831) $(836) $(5) $(730) $(852) $(848) $4
10 years (1,650) (1,974) (1,999) (25) (2,180) (2,718) (2,703) 15
Total U.S. Treasury futures $(2,380) $(2,805) $(2,835) $(30) $(2,910) $(3,570) $(3,551) $19

1.Net carrying value represents the difference between the fair market value and the cost basis (or the forward price to be paid/(received) for the underlying U.S. Treasury security) of the U.S. Treasury futures contract as of period-end and is reported in derivative assets/(liabilities), at fair value in our consolidated balance sheets.

  March 31, 2019 December 31, 2018
TBA Securities by Coupon 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
15-Year TBA securities:                
3.0% $327
 $328
 $329
 $1
 $567
 $557
 $566
 $9
3.5% 1,969
 1,996
 2,013
 17
 1,706
 1,708
 1,726
 18
4.0% 1,083
 1,108
 1,115
 7
 1,350
 1,370
 1,381
 11
Total 15-Year TBA securities 3,379
 3,432
 3,457
 25
 3,623
 3,635
 3,673
 38
30-Year TBA securities:                
3.0% 903
 886
 899
 13
 1,028
 981
 1,003
 22
3.5% 3,084
 3,095
 3,125
 30
 (2,979) (2,943) (2,977) (34)
4.0% (3,148) (3,222) (3,238) (16) 3,030
 3,073
 3,089
 16
≥ 4.5% 2,604
 2,694
 2,712
 18
 2,450
 2,506
 2,534
 28
Total 30-Year TBA securities, net 3,443
 3,453
 3,498
 45
 3,529
 3,617
 3,649
 32
Total TBA securities, net $6,822
 $6,885
 $6,955
 $70
 $7,152
 $7,252
 $7,322
 $70



  March 31, 2018 December 31, 2017
TBA Securities by Coupon 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
 
Notional 
Amount - Long (Short)
 
Cost
Basis
 
Fair
Value
 
Net Carrying Value 1
15-Year TBA securities:                
2.5% $403
 $390
 $394
 $4
 $1,373
 $1,372
 $1,370
 $(2)
3.0% 2,774
 2,756
 2,768
 12
 3,161
 3,225
 3,217
 (8)
3.5% 750
 761
 764
 3
 414
 428
 428
 
Total 15-Year TBA securities 3,927
 3,907
 3,926
 19
 4,948
 5,025
 5,015
 (10)
30-Year TBA securities:                
3.0% 3,822
 3,690
 3,726
 36
 4,317
 4,303
 4,312
 9
3.5% 3,272
 3,259
 3,276
 17
 3,932
 4,027
 4,034
 7
4.0% 2,650
 2,709
 2,719
 10
 2,338
 2,449
 2,446
 (3)
4.5% (35) (36) (36) 
 (61) (65) (65) 
Total 30-Year TBA securities, net 9,709
 9,622
 9,685
 63
 10,526
 10,714
 10,727
 13
Total TBA securities, net $13,636
 $13,529
 $13,611
 $82
 $15,474
 $15,739
 $15,742
 $3

1.Net carrying value represents the difference between the fair market value and the cost basis (or the forward price to be paid/(received) for the underlying Agency security) of the TBA contract as of period-end and is reported in derivative assets/(liabilities), at fair value in our consolidated balance sheets.

Gain (Loss) From Derivative Instruments and Other Securities, Net
The following table summarizes changes in our derivative and other hedge portfolio and their effect on our consolidated statements of comprehensive income for the three months ended March 31, 20182019 and 20172018 (in millions):

Derivative and Other Hedging Instruments 
Beginning
Notional Amount
 Additions 
Settlement, Termination,
Expiration or
Exercise
 
Ending
Notional Amount
  
Gain/(Loss)
on Derivative Instruments and Other Securities, Net 1
Three months ended March 31, 2019:           
TBA securities, net $7,152
 18,442
 (18,772) $6,822
  $83
Interest rate swaps $51,625
 5,350
 (8,800) $48,175
  (596)
Payer swaptions $3,500
 
 (950) $2,550
  (27)
U.S. Treasury securities - short position $(21,345) (4,770) 7,380
 $(18,735)  (425)
U.S. Treasury securities - long position $45
 405
 (330) $120
  
U.S. Treasury futures contracts - short position $(1,650) (1,650) 1,650
 $(1,650)  (31)
           $(996)
Three months ended March 31, 2018:           
TBA securities, net $15,474
 43,669
 (45,507) $13,636
  $(292)
Interest rate swaps $43,700
 3,150
 (1,600) $45,250
  663
Payer swaptions $6,650
 1,100
 (1,000) $6,750
  91
U.S. Treasury securities - short position $(10,699) (662) 563
 $(10,798)  212
U.S. Treasury securities - long position $
 959
 (734) $225
  
U.S. Treasury futures contracts - short position $(2,910) (2,909) 3,439
 $(2,380)  62
           $736
Derivative and Other Hedging Instruments 
Beginning
Notional Amount
 Additions 
Settlement, Termination,
Expiration or
Exercise
 
Ending
Notional Amount
  
Gain/(Loss)
on Derivative Instruments and Other Securities, Net 1
Three months ended March 31, 2018:           
TBA securities, net $15,474
 43,669
 (45,507) $13,636
  $(292)
Interest rate swaps $43,700
 3,150
 (1,600) $45,250
  663
Payer swaptions $6,650
 1,100
 (1,000) $6,750
  91
U.S. Treasury securities - short position $(10,699) (662) 563
 $(10,798)  212
U.S. Treasury securities - long position $
 959
 (734) $225
  
U.S. Treasury futures contracts - short position $(2,910) (2,909) 3,439
 $(2,380)  62
           $736
Three months ended March 31, 2017:           
TBA securities, net $10,916
 36,096
 (32,842) $14,170
  $39
Interest rate swaps $37,175
 1,300
 (2,700) $35,775
  22
Payer swaptions $1,200
 1,000
 
 $2,200
  (11)
U.S. Treasury securities - short position $(8,061) (2,558) 1,450
 $(9,169)  (78)
U.S. Treasury securities - long position $189
 303
 (492) $
  1
U.S. Treasury futures contracts - short position $(1,810) (1,810) 1,810
 $(1,810)  (12)
           $(39)

________________________________
1.Amounts above exclude other miscellaneous gains and losses recognized in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income.


Note 7. Pledged Assets
Our funding agreements require us to fully collateralize our obligations under the agreements based upon our counterparties' collateral requirements and their determination of the fair value of the securities pledged as collateral, which fluctuates with changes in interest rates, credit quality and liquidity conditions within the investment banking, mortgage finance and real estate industries. Our derivative contracts similarly require us to fully collateralize our obligations under such agreements, which will vary over time based on similar factors as well as our counterparties' determination of the value of the derivative contract. We are


typically required to post initial margin upon execution of derivative transactions, such as under our interest rate swap agreements and TBA contracts, and subsequently post or receive variation margin based on daily fluctuations in fair value. Our prime brokerage agreements, pursuant to which we receive custody and settlement services, and the clearing organizations utilized by our wholly-owned captive broker-dealer subsidiary, Bethesda Securities, LLC, also require that we post minimum daily clearing deposits. If we breach our collateral requirements, we will be required to fully settle our obligations under the agreements, which could include a forced liquidation of our pledged collateral.
Our counterparties also apply a "haircut" to our pledged collateral, which means our collateral is valued at slightly less than market value and limits the amount we can borrow against our securities. This haircut reflects the underlying risk of the specific collateral and protects our counterparty against a change in its value. Our agreements do not specify the haircut; rather haircuts are determined on an individual transaction basis. Consequently, our funding agreements and derivative contracts expose us to credit risk relating to potential losses that could be recognized if our counterparties fail to perform their obligations under such agreements. We minimize this risk by limiting our counterparties to major financial institutions with acceptable credit ratings or to registered clearinghouses and U.S. government agencies, and we monitor our positions with individual counterparties. In the event of a default by a counterparty, we may have difficulty obtaining our assets pledged as collateral to such counterparty and may not receive payments provided for under the terms of our derivative agreements. In the case of centrally cleared instruments, we could be exposed to credit risk if the central clearing agency or a clearing member defaults on its respective obligation to perform under the contract. However, we believe that the risk is minimal due to the clearing exchanges' initial and daily mark to marketmark-to-market margin requirements, clearinghouse guarantee funds and other resources that are available in the event of a clearing


member default. As of March 31, 2019, our maximum amount at risk with any counterparty other than the Fixed Income Clearing Corporation related to our repurchase agreements was less than 4% of our tangible stockholders' equity. As of March 31, 2019, approximately 7% of our tangible stockholder's equity was at risk with the Fixed Income Clearing Corporation. Equity at risk is defined as the net carrying value of securities pledged under repurchase agreements, including accrued interest plus any cash or assets on deposit to secure the repurchase obligation, less the amount of the repurchase liability, including accrued interest.
Our International Swaps and Derivatives Association ("ISDA") Master Agreements contain a cross default provision under which a default under the terms of certain of our other indebtedness in excess of certain thresholds causes an event of default under the ISDA Master Agreement. Threshold amounts vary by lender. Following an event of default, we could be required to settle our obligations under the agreements. Additionally, under certain of our ISDA Master Agreements, we could be required to settle our obligations under the agreements if we fail to maintain certain minimum stockholders' equity thresholds or our REIT status or if we fail to comply with limits on our leverage up to certain specified levels. As of March 31, 20182019, the fair value of additional collateral that could be required to be posted as a result of the credit-risk-related contingent features being triggered was not material to our financial statements.
As of March 31, 2018, our amount at risk with any counterparty related to our repurchase agreements was less than 5% of our tangible stockholders' equity and our maximum amount at risk with any counterparty related to our interest rate swap and swaption agreements, excluding centrally cleared swaps, was less than 1% of our stockholders' equity.


Assets Pledged to Counterparties
The following tables summarize our assets pledged as collateral under our funding, derivative and prime broker agreements by type, including securities pledged related to securities sold but not yet settled, as of March 31, 20182019 and December 31, 20172018 (in millions):
  March 31, 2019
Assets Pledged to Counterparties 1
 
Repurchase Agreements 2
 Debt of Consolidated VIEs Derivative Agreements 
Prime Broker Agreements 3
 Total
Agency RMBS - fair value $89,779
 $425
 $174
 $118
 $90,496
CRT - fair value 142
 
 
 
 142
Non-Agency - fair value 45
 
 
 
 45
U.S. Treasury securities - fair value 617
 
 
 
 617
Accrued interest on pledged securities 278
 1
 1
 
 280
Restricted cash and cash equivalents 75
 
 442
 
 517
Total $90,936
 $426
 $617
 $118
 $92,097
  March 31, 2018
Assets Pledged to Counterparties 
Repurchase Agreements 1
 Debt of Consolidated VIEs Derivative Agreements 
Prime Broker Agreements 2
 Total
Agency RMBS - fair value $50,996
 $621
 $202
 $410
 $52,229
U.S. Treasury securities - fair value 3
 115
 
 49
 
 164
Accrued interest on pledged securities 151
 2
 1
 1
 155
Restricted cash and cash equivalents 49
 
 331
 6
 386
Total $51,311
 $623
 $583
 $417
 $52,934

  December 31, 2018
Assets Pledged to Counterparties 1
 
Repurchase Agreements 2
 Debt of Consolidated VIEs Derivative Agreements 
Prime Broker Agreements 3
 Total
Agency RMBS - fair value $78,997
 $436
 $174
 $133
 $79,740
CRT - fair value 141
 
 
 
 141
Non-Agency - fair value 45
 
 
 
 45
U.S. Treasury securities - fair value 437
 
 
 
 437
Accrued interest on pledged securities 246
 1
 1
 
 248
Restricted cash and cash equivalents 77
 
 522 
 599
Total $79,943
 $437
 $697
 $133
 $81,210
  December 31, 2017
Assets Pledged to Counterparties 
Repurchase Agreements 1
 Debt of Consolidated VIEs Derivative Agreements 
Prime Broker Agreements 2
 Total
Agency RMBS - fair value $52,497
 $662
 $221
 $519
 $53,899
U.S. Treasury securities - fair value 3
 113
 
 72
 
 185
Accrued interest on pledged securities 153
 2
 1
 2
 158
Restricted cash and cash equivalents 35
 
 281 1
 317
Total $52,798
 $664
 $575
 $522
 $54,559

1.Includes $174repledged assets received as collateral from counterparties.
2.Includes $161 million and $182$163 million of retained interests in our consolidated VIEs pledged as collateral under repurchase agreements as of March 31, 20182019 and December 31, 2017,2018, respectively.
2.3.Includes margin for TBAs cleared through prime brokers and other clearing deposits.
3.Includes repledged securities received as collateral from counterparties.
The following table summarizes our securities pledged as collateral under our repurchase agreements by the remaining maturity of our borrowings, including securities pledged related to sold but not yet settled securities, as of March 31, 2018 and December 31, 2017 (in millions). For the corresponding borrowings associated with the following amounts and the interest rates thereon, refer to Note 5.
  March 31, 2018 December 31, 2017
Securities Pledged by Remaining Maturity of Repurchase Agreements Fair Value of Pledged Securities 
Amortized
Cost of Pledged Securities
 
Accrued
Interest on
Pledged
Securities
 Fair Value of Pledged Securities 
Amortized
Cost of Pledged Securities
 
Accrued
Interest on
Pledged
Securities
RMBS:1,2
            
  ≤ 30 days $25,229
 $25,939
 $75
 $20,162
 $20,313
 $59
  > 30 and ≤ 60 days 8,001
 8,249
 24
 12,950
 13,061
 38
  > 60 and ≤ 90 days 5,561
 5,724
 17
 4,000
 4,013
 11
  > 90 days 12,205
 12,570
 36
 15,385
 15,512
 45
Total RMBS $50,996
 $52,482
 $152
 $52,497
 $52,899
 $153

1.Includes $174 million and $182 million of retained interests in our consolidated VIEs pledged as collateral under repurchase agreements as of March 31, 2018 and December 31, 2017, respectively.
2.March 31, 2018 amounts exclude $115 million of repledged U.S. Treasury securities received as collateral from counterparties.
The table above excludes Agency securities transferred to our consolidated VIEs. Securities transferred to our consolidated VIEs can only be used to settle the obligations of each respective VIE. However, we may pledge our retained interests in our consolidated VIEs as collateral under our repurchase agreements and derivative contracts. Please refer to Note 4 for additional information regarding our consolidated VIEs.

The following table summarizes our securities pledged as collateral under our repurchase agreements by the remaining maturity of our borrowings, including securities pledged related to sold but not yet settled securities, as of March 31, 2019 and December 31, 2018 (in millions). For the corresponding borrowings associated with the following amounts and the interest rates thereon, refer to Note 5.


  March 31, 2019 December 31, 2018
Securities Pledged by Remaining Maturity of Repurchase Agreements 1,2
 Fair Value of Pledged Securities 
Amortized
Cost of Pledged Securities
 
Accrued
Interest on
Pledged
Securities
 Fair Value of Pledged Securities 
Amortized
Cost of Pledged Securities
 
Accrued
Interest on
Pledged
Securities
  ≤ 30 days $45,947
 $45,673
 $143
 $49,944
 $50,654
 $156
  > 30 and ≤ 60 days 10,792
 10,758
 34
 14,586
 14,810
 46
  > 60 and ≤ 90 days 17,282
 17,267
 53
 7,770
 7,843
 24
  > 90 days 15,945
 16,108
 48
 6,882
 7,079
 21
Total $89,966
 $89,806
 $278
 $79,182
 $80,386
 $247
________________________________
1.Includes $161 million and $163 million of retained interests in our consolidated VIEs pledged as collateral under repurchase agreements as of March 31, 2019 and December 31, 2018, respectively.
2.Excludes $496 million and $437 million of repledged U.S. Treasury securities received as collateral from counterparties as of March 31, 2019 and December 31, 2018, repsectively.
Assets Pledged from Counterparties
As of March 31, 20182019 and December 31, 2017,2018, we had assets pledged to us from counterparties as collateral under our reverse repurchase and derivative agreements summarized in the tables below (in millions).
  March 31, 2019 December 31, 2018
Assets Pledged to AGNC 1
 Reverse Repurchase Agreements Derivative Agreements Repurchase Agreements Total Reverse Repurchase Agreements Derivative Agreements Repurchase Agreements Total
U.S. Treasury securities - fair value $20,400
 $10
 $30
 $20,440
 $21,876
 $35
 $37
 $21,948
Cash 
 49
 
 49
 
 129
 
 129
Total $20,400
 $59
 $30
 $20,489
 $21,876
 $164
 $37
 $22,077
________________________________
  March 31, 2018 December 31, 2017
Assets Pledged to AGNC 
Reverse Repurchase Agreements 1
 Derivative Agreements Total Reverse Repurchase Agreements Derivative Agreements Total
U.S. Treasury securities - fair value $10,712
 $
 $10,712
 $10,853
 $
 $10,853
Cash 
 247
 247
 
 82
 82
Total $10,712
 $247
 $10,959
 $10,853
 $82
 $10,935
1.Includes $496 million and $437 million of repledged U.S. Treasury securities received as collateral from counterparties as of March 31, 2019 and December 31, 2018, respectively.
U.S Treasury securities received as collateral under our reverse repurchase agreements thatfor which we use to cover short sales of U.S. Treasury securities are accounted for as securities borrowing transactions. We recognize a corresponding obligation to return the borrowed securities at fair value on the accompanying consolidated balance sheets based on the value of the underlying borrowed securities as of the reporting date.
Cash collateral received is recognized in cash and cash equivalents with a corresponding amount recognized in accounts payable and other accrued liabilities on the accompanying consolidated balance sheets.
Offsetting Assets and Liabilities
Certain of our repurchase agreements and derivative transactions are governed by underlying agreements that generally provide for a right of setoff under master netting arrangements (or similar agreements), including in the event of default or in the event of bankruptcy of either party to the transactions. We present our assets and liabilities subject to such arrangements on a gross basis in our consolidated balance sheets. The following tables present information about our assets and liabilities that are subject to master netting arrangements and can potentially be offset on our consolidated balance sheets as of March 31, 20182019 and December 31, 20172018 (in millions):
  Offsetting of Financial and Derivative Assets
  Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets 
Gross Amounts Not Offset
 in the
Consolidated Balance Sheets
 Net Amount
     Financial Instruments 
Collateral Received 2
 
March 31, 2018            
Interest rate swap and swaption agreements, at fair value 1
 $327
 $
 $327
 $(1) $(243) $83
TBA securities, at fair value 83
 
 83
 (1) 
 82
Receivable under reverse repurchase agreements 10,770
 
 10,770
 (7,606) (3,164) 
Total $11,180
 $
 $11,180
 $(7,608) $(3,407) $165
             
December 31, 2017            
Interest rate swap and swaption agreements, at fair value 1
 $156
 $
 $156
 $(1) $(82) $73
TBA securities, at fair value 30
 
 30
 (22) 
 8
Receivable under reverse repurchase agreements 10,961
 
 10,961
 (9,682) (1,279) 
Total $11,147
 $
 $11,147
 $(9,705) $(1,361) $81



  Offsetting of Financial and Derivative Assets
  Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets 
Gross Amounts Not Offset
 in the
Consolidated Balance Sheets
 Net Amount
     Financial Instruments 
Collateral Received 2
 
March 31, 2019            
Interest rate swap and swaption agreements, at fair value 1
 $162
 $
 $162
 $(1) $(59) $102
TBA securities, at fair value 91
 
 91
 (21) 
 70
Receivable under reverse repurchase agreements 20,430
 
 20,430
 (17,353) (3,072) 5
Total $20,683
 $
 $20,683
 $(17,375) $(3,131) $177
             
December 31, 2018            
Interest rate swap and swaption agreements, at fair value 1
 $163
 $
 $163
 $
 $(158) $5
TBA securities, at fair value 110
 
 110
 (40) 
 70
Receivable under reverse repurchase agreements 21,813
 
 21,813
 (17,236) (4,575) 2
Total $22,086
 $
 $22,086
 $(17,276) $(4,733) $77

 Offsetting of Financial and Derivative Liabilities Offsetting of Financial and Derivative Liabilities
 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets 
Gross Amounts Not Offset
 in the
Consolidated Balance Sheets
 Net Amount Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets 
Gross Amounts Not Offset
 in the
Consolidated Balance Sheets
 Net Amount
 Financial Instruments 
Collateral Pledged 2
  Financial Instruments 
Collateral Pledged 2
 
March 31, 2018            
March 31, 2019            
Interest rate swap agreements, at fair value 1
 $1
 $
 $1
 $(1) $
 $
 $1
 $
 $1
 $(1) $
 $
TBA securities, at fair value 1
 
 1
 (1) 
 
 21
 
 21
 (21) 
 
Repurchase agreements 48,956
 
 48,956
 (7,606) (41,350) 
 86,685
 
 86,685
 (17,353) (69,332) 
Total $48,958
 $
 $48,958
 $(7,608) $(41,350) $
 $86,707
 $
 $86,707
 $(17,375) $(69,332) $
                        
December 31, 2017            
December 31, 2018            
Interest rate swap agreements, at fair value 1
 $1
 $
 $1
 $(1) $
 $
 $
 $
 $
 $
 $
 $
TBA securities, at fair value 27
 
 27
 (22) (5) 
 40
 
 40
 (40) 
 
Repurchase agreements and FHLB advances 50,296
 
 50,296
 (9,682) (40,614) 
Repurchase agreements 75,717
 
 75,717
 (17,236) (58,481) 
Total $50,324
 $
 $50,324
 $(9,705) $(40,619) $
 $75,757
 $
 $75,757
 $(17,276) $(58,481) $

1.Reported under derivative assets / liabilities, at fair value in the accompanying consolidated balance sheets. Refer to Note 6 for a reconciliation of derivative assets / liabilities, at fair value to their sub-components.
2.Includes cash and securities pledged / received as collateral, at fair value. Amounts include repledged collateral. Amounts presented are limited to collateral pledged sufficient to reduce the net amount to zero for individual counterparties, as applicable.


Note 8. Fair Value Measurements
We determine the fair value of our financial instruments based on our estimate of the price that would be received to sell the asset or paid to transfer the liability in an orderly transaction between market participants at the measurement date. We typically obtain price estimates from multiple third-party pricing services and dealers or, if applicable, the clearing exchange (see Note 3 for further details.) We utilize a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument's categorization within the hierarchy is based upon the lowest level of input that is significant to the fair value measurement.
The three levels of valuation hierarchy are defined as follows:
Level 1 Inputs —Quoted prices (unadjusted) for identical unrestricted assets and liabilities in active markets that are accessible at the measurement date.


Level 2 Inputs —Quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.
Level 3 Inputs —Instruments with primarily unobservable market data that cannot be corroborated.
The availability of observable inputs can vary by instrument and is affected by a wide variety of factors, including the type of instrument, whether the instrument is new and not yet established in the marketplace and other characteristics particular to the instrument.  Third-party pricing sources may also use certain unobservable inputs, such as assumptions of future levels of prepayment, defaults and loss severities, especially when estimating fair values for securities with lower levels of recent trading activity.
We make inquiries of third-party pricing sources to understand the significant inputs and assumptions they used to determine their prices. We also review third-party price estimates and perform procedures to validate their reasonableness, including an analysis of the range of estimates for each position, comparison to recent trade activity for similar securities, and for consistency with market conditions observed as of the measurement date. While we do not adjust prices we obtain from pricing sources, we will exclude prices for securities from our estimation of fair value if we determine (based on our validation procedures and our market knowledge and expertise) that the price is significantly different from what observable market data would indicate and we cannot obtain an understanding from the third-party source as to the significant inputs used to determine the price.  
The validation procedures described above also influence our determination of the appropriate fair value measurement categorization. The following table provides a summary of our assets and liabilities that are measured at fair value on a recurring


basis as of March 31, 20182019 and December 31, 20172018 based on their categorization within the valuation hierarchy (in millions). There were no transfers between valuation hierarchy levels during the periods presented.
  March 31, 2019 December 31, 2018
  Level 1 Level 2 Level 3 Level 1 Level 2 Level 3
Assets:            
Agency securities $
 $93,044
 $
 $
 $82,291
 $
Agency securities transferred to consolidated VIEs 
 425
 
 
 436
 
Credit risk transfer securities 
 1,129
 
 
 1,012
 
Non-Agency securities 
 672
 
 
 548
 
U.S. Treasury securities 121
 
 
 46
 
 
Interest rate swaps 
 151
 
 
 126
 
Swaptions 
 11
 
 
 37
 
TBA securities 
 91
 
 
 110
 
Total $121
 $95,523
 $
 $46
 $84,560
 $
Liabilities:            
Debt of consolidated VIEs $
 $266
 $
 $
 $275
 $
Obligation to return U.S. Treasury securities borrowed under reverse repurchase agreements 19,275
 
 
 21,431
 
 
Interest rate swaps 
 1
 
 
 
 
TBA securities 
 21
 
 
 40
 
U.S. Treasury futures 31
 
 
 44
 
 
Total $19,306

$288

$
 $21,475
 $315
 $
  March 31, 2018 December 31, 2017
  Level 1 Level 2 Level 3 Level 1 Level 2 Level 3
Assets:            
Agency securities $
 $54,141
 $
 $
 $55,506
 $
Agency securities transferred to consolidated VIEs 
 621
 
 
 662
 
Credit risk transfer securities 
 884
 
 
 876
 
Non-Agency securities 
 36
 
 
 36
 
U.S. Treasury securities 224
 
 
 
 
 
REIT equity securities 42
 
 
 29
 
 
Interest rate swaps 
 174
 
 
 81
 
Swaptions 
 153
 
 
 75
 
TBA securities 
 83
 
 
 30
 
U.S. Treasury futures 
 
 
 19
 
 
Total $266
 $56,092
 $
 $48
 $57,266
 $
Liabilities:            
Debt of consolidated VIEs $
 $336
 $
 $
 $357
 $
Obligation to return U.S. Treasury securities borrowed under reverse repurchase agreements 10,352
 
 
 10,467
 
 
Interest rate swaps 
 1
 
 
 1
 
TBA securities 
 1
 
 
 27
 
U.S. Treasury futures 30
 
 
 
 
 
Total $10,352

$338

$
 $10,467
 $385
 $

Excluded from the table above are financial instruments, including cash and cash equivalents, restricted cash and cash equivalents, receivables, payables and borrowings under repurchase agreements, which are presented in our consolidated financial statements at cost. The cost basis of these instruments is determined to approximate fair value due to their short duration or, in the case of longer-term repo, due to floating rates of interest based on an index plus or minus a fixed spread which is consistent with fixed spreads demanded in the market. We estimate the fair value of these instruments using "Level 1" or "Level 2" inputs.




Note 9. Net Income Per Common Share


Basic net income per common share includes no dilution and is computed by dividing net income applicable to common stock by the weighted-average number of common shares outstanding and the weighted-average number of vested but not yet issued restricted stock units and performance share units outstanding for the respective period. Diluted earnings per common share includes the impact of dilutive potential common shares outstanding during the period using the treasury stock method. Dilutive potential common shares outstanding include unvested restricted stock units and performance share units granted under our long-term incentive program to employees and non-employee Board of Directors. The following table presents the computations of basic and diluted net income per common share for the periods indicated (shares and dollars in millions):
  Three Months Ended March 31,
  2019 2018
Weighted average number of common shares issued and outstanding 536.3
 391.3
Weighted average number of fully vested restricted stock units and performance share units outstanding 0.4
 
Weighted average number of common shares outstanding - basic 536.7
 391.3
Weighted average number of dilutive unvested restricted stock units and performance share units outstanding 0.5
 0.2
Weighted average number of common shares outstanding - diluted 537.2
 391.5
Net income available to common stockholders $255
 $415
Net income per common share - basic $0.48
 $1.06
Net income per common share - diluted $0.47
 $1.06

  Three Months Ended March 31,
  2018 2017
Weighted average number of common shares outstanding - basic 391.3
 331.0
Unvested restricted stock units and performance share units 0.2
 0.1
Weighted average number of common shares outstanding - diluted 391.5
 331.1
Net income available to common stockholders $415
 $69
Net income per common share - basic and diluted $1.06
 $0.21




Note 10. Stockholders' Equity
Preferred Stock
Pursuant to our amended and restated certificate of incorporation, weWe are authorized to designate and issue up to 10.0 million shares of preferred stock in one or more classes or series. As of DecemberMarch 31, 20172019 and MarchDecember 31, 2018, 8,050 shares were designated as 7.750% Series B Cumulative Redeemable Preferred Stock ("Series B Preferred Stock") and 13,800 shares were designated as 7.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock ("Series C Preferred Stock"). Shares ofDuring March 2019, we designated an additional 9,400 shares as 6.875% Series B and Series CD Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock are represented by depositary shares equal to 1/1000 interest in each("Series D Preferred Stock"). Each share of Series B, C, and Series CD Preferred Stock respectively. As of December 31, 2017 and March 31, 2018, we had 7,000 shares of Series B Preferred Stock and 13,000 shares of Series C Preferred Stock outstanding (representedis represented by 7.0 million Series B1,000 depositary shares and 13.0 million Series C depositary shares outstanding, respectively) and 9,980,000 of authorized but unissued shares of preferred stock.
Holders of depository shares underlying our Series B Preferred Stock are entitled to receive cumulative cash dividends at a rate of 7.750% per annum of their $25.00 per depositary share liquidation preference. Holders of depositary shares underlying our Series C Preferred Stock are entitled to receive cumulative cash dividends at a rate of 7.00% per annum up to, and including, October 14, 2022 and thereafter at a floating rate equal to three-month LIBOR plus a spread of 5.111% per annum of their $25.00 per depositary share liquidation preference. Dividends are payable quarterly in arrears on the 15th day of each January, April, July and October. As of March 31, 2018, we had declared all required quarterly dividends on our preferred stock.shares.
Our preferred stock ranks senior to our common stock with respect to the payment of dividends and the distribution of assets upon a voluntary or involuntary liquidation, dissolution or winding up of the Company. Our preferred stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and ranks on parity with each other. Under certain circumstances upon a change of control, our preferred stock is convertible to shares of our common stock. Holders of our preferred stock and depository shares underlying our preferred stock have no voting rights, except under limited conditions. Beginning on May 8, 2019 and October 15, 2022, depositoryeach series' optional redemption date, such shares underlying our Series B and Series C Preferred Stock, respectively, will be redeemable at $25.00 per depositary share, plus accumulated and unpaid dividends (whether or not declared), exclusively at our option. We may redeem shares
The following is a summary of our preferred stock prior to our optional redemption date under certain circumstances intended to preserve our qualification as a REIT for Federal income tax purposes.
Preferred Stock Offering and Redemption
In August 2017, we issued 13,000 shares of Series C Preferred Stock in a public offering of 13.0 million Series C depositary shares at a price of $25 per depositary share for net proceeds of $315 million, after deducting underwriting discounts and estimated offering expenses. In September 2017, we redeemed all of our issued and outstanding as of March 31, 2019 (dollars and shares of 8.000% Series A Cumulative Redeemable Preferred Stock ("Series A Preferred Stock") for $173 million (or $25 per share liquidation preference), plus accrued and unpaid dividends, and, in October of 2017, we filed a Certificate of Elimination of our Series A Preferred Stock with the Secretary of State of the State of Delaware, which eliminated the designation of Series A Preferred Stock from our amended and restated certificate of incorporation.millions):
Common Stock Offerings
In May 2017, we completed a public offering in which 24.5 million shares of our common stock were sold to the underwriters for proceeds of $503 million, or $20.51 per common share, net of offering costs. In September 2017, we completed a public offering in which 28.2 million shares of our common stock were sold to the underwriters for proceeds of $577 million, or $20.47 per common share, net of estimated offering costs.
Preferred Stock 
Issuance
Date
 
Depository
Shares
Issued
and
Outstanding
 
Carrying
Value
 
 Aggregate
Liquidation Preference
 
Fixed
Rate
 
Optional
Redemption
Date 2
 
Fixed-to-Floating
Rate
Conversion
Date
 
Floating
Annual Rate
Fixed Rate                
Series B May 8, 2014 7.0
 $169
 $175
 7.750% May 8, 2019 N/A N/A
Fixed-to-Floating Rate 1
                
Series C August 22, 2017 13.0
 315
 325
 7.000% October 15, 2022 October 15, 2022 3M LIBOR + 5.111%
Series D March 6, 2019 9.4
 227
 235
 6.875% April 15, 2024 April 15, 2024 3M LIBOR + 4.332%
Total 
 29.4
 $711
 $735
        

1.Fixed-to-floating rate redeemable preferred stock accrue dividends at a annual fixed rate of the $25.00 liquidation preference per depository share from the issuance date up to, but not including, the fixed-to-floating rate conversion date; thereafter, dividends will accrue on a floating rate basis equal to 3 month LIBOR plus a fixed spread.


2.Shares may be redeemed prior to our optional redemption date under certain circumstances intended to preserve our qualification as a REIT for U.S federal income tax purposes.
At-the-Market Offering Program
In February 2017, we enteredWe are authorized by our Board of Directors to enter into agreements with sales agents to publicly offer and sell shares of our common stock in privately negotiated and/or at-the-market transactions from time-to-time up to ana maximum aggregate amount of $750 million of sharesoffering price of our common stock.stock through June 14, 2021. During fiscal year 2017,the quarter ended March 31, 2019, we sold 7.6 milliondid not sell shares of our common stock under the sales agreements for proceeds of $159 million, or $20.96 per common share, net of estimated offering costs.agreements. As of March 31, 2018, $589 million of2019, shares of our common stock remain availablewith an aggregate offering price of $660 million remained authorized for issuance under this program.


Accumulated Other Comprehensive Income (Loss)
The following table summarizes changes to accumulated OCI for the three months ended March 31, 20182019 and 20172018 (in millions):
  Three Months Ended March 31,
Accumulated Other Comprehensive Income (Loss) 2019 2018
Beginning Balance $(943) $(345)
OCI before reclassifications 396
 (620)
(Gain) loss amounts for available-for-sale securities reclassified from accumulated OCI to realized gain (loss) on sale of investment securities 4
 (1)
Ending Balance $(543) $(966)

  Three Months Ended March 31,
Accumulated Other Comprehensive Income (Loss) 2018 2017
Beginning Balance $(345) $(397)
OCI before reclassifications (620) (38)
(Gain) loss amounts for available-for-sale securities
reclassified from accumulated OCI to realized gain (loss) on sale of investment securities
 (1) 84
Ending Balance $(966) $(351)


Note 11. Subsequent Events


On April 12, 2018 ,10, 2019, our Board of Directors declared a monthly dividend of $0.18 per common share payable on May 9, 20182019 to common stockholders of record as of April 30, 2018, respectively.2019.
On May 2, 2018, we entered into an amendment to our management agreement with MTGE in connection with the proposed acquisition of MTGE by Annaly Capital Management, Inc. The transaction is expected to close in the third quarter of 2018, subject to customary closing conditions.  Pursuant to the amendment, we will continue to manage MTGE through the closing of the merger and for a short transitional period following the merger.  In addition to regular monthly management fees payable for ongoing service through the transition period, under the amendment we will be paid a termination fee of $41.7 million.    





Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
Management's Discussion and Analysis of Financial Condition and Results of Operations ("MD&A") is designed to provide a reader of AGNC Investment Corp.'s consolidated financial statements with a narrative from the perspective of management, and should be read in conjunction with the consolidated financial statements and accompanying notes included in this Quarterly Report on Form 10-Q for quarterly period ended March 31, 2018.2019. Our MD&A is presented in six sections:
Executive Overview
Financial Condition
Results of Operations
Liquidity and Capital Resources
Off-Balance Sheet Arrangements
Forward-Looking Statements
EXECUTIVE OVERVIEW
We are an internally managedinternally-managed Real Estate Investment Trust ("REIT"). We commenced operations on May 20, 2008 following the completion of our initial public offering. Our common stock is traded on The Nasdaq Global Select Market under the symbol "AGNC."
As a REIT, we are required to distribute annually 90% of our taxable income. So long as we continue to qualify asAs a REIT, we will generally not be subject to U.S. Federalfederal or state corporate taxes on our taxable income to the extent that we distribute all our annual taxable income to our stockholders on a timely basis. It is our intention to distribute 100% of our taxable income within the time limits prescribed by the Internal Revenue Code, which may extend into the subsequent taxable year.
We earn incomeinvest primarily from investing in Agency residential mortgage-backed securities ("Agency RMBS") on a leveraged basis. These investments consist of residential mortgage pass-through securities and collateralized mortgage obligations for which the principal and interest payments are guaranteed by a U.S. Government-sponsored enterprise, such as the Federal National Mortgage Association ("Fannie Mae") and the Federal Home Loan Mortgage Corporation ("Freddie Mac," and together with Fannie Mae, the "GSEs"), or by a U.S. Government agency, such as the Government National Mortgage Association ("Ginnie Mae"). We may also invest in other types of mortgage and mortgage-related residential and commercial mortgage-backed securities where repayment of principal and interest is not guaranteed by a GSE or U.S. Government agency.agency and in other investments in, or related to, the housing, mortgage or real estate markets.
Our principal objective is to provide our stockholders with attractive risk-adjusted returns through a combination of monthly dividends and tangible net book value accretion. We generate income from the interest earned on our investments, net of associated borrowing and hedging costs, and net realized gains and losses on our investment and hedging activities. We fund our investments primarily through borrowings structured as repurchase agreements.
The size and composition of our investment portfolio depends on the investment strategies we implement, availability of attractively priced investments, suitable financing to appropriately leverage our investment portfolio and overall market conditions. Market conditions are influenced by a variety of factors, including interest rates, prepayment expectations, liquidity, housing prices, unemployment rates, general economic conditions, government participation in the mortgage market, regulations and relative returns on other assets.


Trends and Recent Market Impacts
Following the challenging market conditions experienced in the fourth quarter of 2018, financial markets rebounded in the first quarter of 2019, with the S&P 500 recovering almost the entirety of its fourth quarter decline as investor sentiment improved markedly. Weaker domestic and international economic growth, coupled with benign inflation indicators, led the Federal Reserve to adopt a more neutral monetary policy stance during the first quarter, signaling that further increases to the Federal Funds rate were unlikely in 2019. The keyFederal Reserve also announced that it would suspend the runoff of its U.S. Treasury portfolio in September 2019, thus maintaining a larger balance sheet than the market dynamicspreviously expected. In response, interest rates decreased materially during the first quarter, with the 10-year U.S. Treasury rate declining 28 basis points from 2017, including low2.69% as of December 31, 2018 to 2.41% as of March 31, 2019. Agency RMBS posted a strong first quarter, as valuations benefited from the decline in interest rate volatility steadily increasing equity valuations, stable longer-term rates, and tighter credit spreads all reversed course dramaticallythe outperformance of specified mortgage securities with favorable prepayment characteristics. Credit assets also performed well during the quarter with the improvement in investor sentiment, recovering much of the valuation declines experienced in the fourth quarter of 2018.


The outperformance of our Agency RMBS portfolio relative to interest rate hedges during the first quarter of 2018. The yield on2019 led to our total comprehensive income of $1.22 per common share for the 10-year U.S. Treasury note rose 33 basis points over the quarter while shorter maturity Treasury and swap rates increased 40 to 50 basis points. Consistent with the increase in rates and wider credit spreads more broadly, spreads on Agency RMBS relative to benchmarks widened close to 10 basis points and were the primary driver of our negativequarter. Our economic return of -2.6%on tangible common equity was 7.3% (unannualized) for the quarter, which includescomprised of the decline of -5.4%$0.67 increase in our tangible net book value per common share and $0.54 per share of common dividends declared during the quarter of $0.54 per common share.
Given improving underlying economic fundamentals and a reduction of quantitative easing measures by several key central banks, our core view was that interest rates were biased somewhat higher. As such, by the end of 2017, we reduced our exposure to higher rates by increasing our interest rate hedge position to 97% of our Agency repo, TBA position and other debt. We also adjusted the composition of our interest rate hedges to include a greater portion of interest rate swaptions to provide greater protection against larger interest rate increases and greater interest rate volatility.quarter. During the first quarter, funding costs remained elevated as the prior year-end funding levels persisted through much of the quarter, despite the Fed’s revised outlook and dovish tone. The favorable funding dynamic between Agency RMBS repo and 3-month LIBOR experienced throughout 2018 also abated during the quarter, further negatively impacting our funding costs. In addition, given the sizable decline in interest rates over the last two quarters, our projected lifetime CPR estimates increased during the first quarter, thus leading us to recognize greater premium amortization expense into current period earnings. These factors resulted in a decline in our net interest spread for the first quarter. Although Agency RMBS return expectations are somewhat lower now, we continued to add additionalbelieve that a more stable rate environment should significantly reduce the likelihood that returns will be adversely impacted by interest rate protection, increasingvolatility. Consistent with the lower return environment, we anticipate reducing our interest rate hedge positionmonthly common stock dividend to 103%$0.16 per share, or $0.48 per share per quarter, beginning with the dividend to be declared in May 2019, subject to the discretion and approval of our funding liabilitiesBoard of Directors.
Our "at risk" leverage ratio was 9.4x our tangible equity as of March 31, 2019, up from 9.0x as of December 31, 2018. These actions minimizedConsistent with higher leverage and the impactdeployment of the increase in long-term rates during the first quarter onproceeds from our tangible net book value and should continueMarch 2019 preferred stock equity offering, our investment portfolio increased to limit our exposure to further rate increases. Our net "duration gap," which is a measure of the risk due to


mismatches that can occur between the interest rate sensitivity of our assets and liabilities,$102.2 billion, inclusive of hedges, was 0.5 yearsTBAs, as of March 31, 2018, moderately higher than our net duration gap of 0.1 years2019 from $91.6 billion as of December 31, 2017. As of March 31, 2018, our sensitivity to an instantaneous parallel increase in rates of 50 and 100 basis points, and assuming no portfolio rebalancing actions, was an estimated decline of -3.9% and -9.8%, respectively, of our tangible net book value. (See Item 3. Quantitative and Qualitative Disclosures about Market Risk in this Form 10-Q for further information on our interest rate and spread sensitivity).2018.
The average cost of our reporepurchase agreement funding increased by 25 basis points duringto 2.64% for the first quarter, consistent withcompared to 2.42% for the increase in the federal funds rate, as the Federal Reserve continued to gradually increase short-term interest rates. Over the same period, three-month LIBOR, which is linked to the receive legfourth quarter of our pay fixed interest rate swaps, increased 61 basis points, and ended the quarter 49 bps higher than our average repo rate. Despite this favorable spread differential, our average2018. Our total cost of funds, forwhich includes the first quarter, which includescost of our repurchase agreements, the implied funding costs of our TBA securities and interest rate swaps, increased by 16 basis points to 1.68% for the quarter, as the receive legscost/benefit of our interest rate swaps had not yet fully resetswap hedges, increased by 18 basis points to an average of 2.27% for the higher prevailing 3-month LIBOR rates. first quarter, compared to 2.09% for the fourth quarter of 2018.
Our average net interest margin (includingasset yield, including the implied yield on our TBA dollar roll funded assets and interest rate swap hedges and excluding "catch-up" premium amortization cost due toassociated with changes in our CPR forecasts)forecast, increased 7 basis points to 3.33% for the first quarter decreased to 1.26%, compared to 1.36%2019, from 3.26% for the fourth quarter of 2018, largely due to investments in higher funding costs.
Our investment portfolio decreased modestly duringyielding Agency securities. Notwithstanding the sequential increase, our average asset yield, excluding of “catch-up” amortization, for the first quarter whilewas negatively impacted by higher prepayment expectations as our asset composition was largely unchanged with 30-year and 15-year Agency RMBS fixed rate securities representing 78% and 18% of our investment portfolio, respectively,forecasted CPR increased to 10.5% as of March 31, 2018. Our forecasted lifetime CPR was 7.6% as of March 31, 2018, down2019 from 8.4%7.9% as of December 31, 2017, in line with higher2018.
Our net interest rates. Asspread, which represents the difference between our asset yield and our cost of March 31, 2018,funds (excluding “catch-up” amortization and including TBA securities), was 1.06% for the first quarter of 2019, compared to 1.17% for fourth quarter of 2018.
During the first quarter, we reduced our "at risk" leverage ratio was 8.2xinterest rate hedge portfolio to 77% of our tangible equity, largely unchangedfunding liabilities, from 8.1x94% as of December 31, 2017. Given2018. The reduction in our hedge position was in line with the favorable funding dynamics for Agency RMBScontraction of our asset duration resulting from lower rates and the attractive relative valuations between Agency RMBSa more benign short-term rate outlook. For additional information regarding our interest rate and credit sensitive assets, we continuespread sensitivity please refer to favor levered investments in Agency RMBS over other fixed income products. Should Agency RMBS spreads continue to widen meaningfully, we would view it as an opportunity to opportunistically increase leverage.Item 3. Quantitative and Qualitative Disclosures about Market Risk of this Form 10-Q.



Market Information
The following table summarizes interest rates and prices of generic fixed rate Agency RMBS as of each date presented below:
Interest Rate/Security Price 1
 Mar. 31, 2017 June 30, 2017 Sept. 30, 2017 Dec. 31, 2017 Mar. 31, 2018 
Mar. 31, 2018
vs
Dec. 31, 2017
 Mar. 31, 2018 June 30, 2018 Sept. 30, 2018 Dec. 31, 2018 Mar. 31, 2019 
Mar. 31, 2019
vs
Dec. 31, 2018
LIBOR:      
1-Month 0.98% 1.22% 1.23% 1.56% 1.88% +0.32
bps 1.88% 2.09% 2.26% 2.50% 2.49% -0.01
bps
3-Month 1.15% 1.30% 1.33% 1.69% 2.31% +0.62
bps 2.31% 2.34% 2.40% 2.81% 2.60% -0.21
bps
6-Month 1.42% 1.45% 1.51% 1.84% 2.45% +0.61
bps
U.S. Treasury Security Rate:      
2-Year U.S. Treasury 1.26% 1.38% 1.48% 1.89% 2.27% +0.38
bps 2.27% 2.53% 2.82% 2.49% 2.27% -0.22
bps
3-Year U.S. Treasury 1.50% 1.55% 1.61% 1.98% 2.39% +0.41
bps
5-Year U.S. Treasury 1.93% 1.89% 1.93% 2.21% 2.57% +0.36
bps 2.57% 2.73% 2.95% 2.51% 2.24% -0.27
bps
10-Year U.S. Treasury 2.39% 2.30% 2.33% 2.41% 2.74% +0.33
bps 2.74% 2.85% 3.06% 2.69% 2.41% -0.28
bps
30-Year U.S. Treasury 3.02% 2.84% 2.86% 2.74% 2.97% +0.23
bps 2.97% 2.98% 3.20% 3.02% 2.82% -0.20
bps
Interest Rate Swap Rate:      
2-Year Swap 1.62% 1.61% 1.73% 2.08% 2.58% +0.50
bps 2.58% 2.79% 2.99% 2.67% 2.39% -0.28
bps
3-Year Swap 1.81% 1.74% 1.84% 2.17% 2.65% +0.48
bps
5-Year Swap 2.06% 1.95% 2.00% 2.24% 2.71% +0.47
bps 2.71% 2.88% 3.07% 2.58% 2.29% -0.29
bps
10-Year Swap 2.39% 2.27% 2.28% 2.40% 2.78% +0.38
bps 2.78% 2.93% 3.12% 2.72% 2.41% -0.31
bps
30-Year Swap 2.65% 2.53% 2.52% 2.53% 2.82% +0.29
bps 2.82% 2.93% 3.13% 2.85% 2.58% -0.27
bps
30-Year Fixed Rate Agency Price:      
3.0% $99.15 $99.88 $100.33 $100.02 $97.52 -$2.50 $97.52 $96.86 $95.67 $97.54 $99.55 +$2.01
3.5% $102.29 $102.70 $103.09 $102.70 $100.20 -$2.50 $100.20 $99.52 $98.41 $99.95 $101.35 +$1.40
4.0% $104.90 $105.12 $105.27 $104.59 $102.61 -$1.98 $102.61 $101.96 $100.97 $101.94 $102.86 +$0.92
4.5% $107.24 $107.27 $107.33 $106.40 $104.70 -$1.70 $104.70 $104.13 $103.16 $103.53 $104.20 +$0.67
15-Year Fixed Rate Agency Price:      
2.5% $100.03 $100.53 $100.69 $99.88 $97.98 -$1.90 $97.98 $97.22 $96.47 $97.70 $99.39 +$1.69
3.0% $102.51 $102.64 $102.75 $101.88 $99.88 -$2.00 $99.88 $99.41 $98.77 $99.80 $100.89 +$1.09
3.5% $104.06 $104.06 $104.14 $103.23 $101.94 -$1.29 $101.94 $101.16 $100.51 $101.23 $102.28 +$1.05
4.0% $103.29 $103.44 $103.13 $102.72 $102.63 -$0.09 $102.63 $102.58 $101.98 $102.34 $103.00 +$0.66

________________________________
1.Price information is for generic instruments only and is not reflective of our specific portfolio holdings. Price information is as of 3:00 p.m. (EST) on such date and can vary by source. Prices and interest rates in the table above were obtained from Barclays. LIBOR rates were obtained from Bloomberg.






FINANCIAL CONDITION
As of March 31, 20182019 and December 31, 2017,2018, our investment portfolio consisted of $55.795.3 billion and $57.184.3 billion of investment securities, at fair value, respectively, and $13.6$7.0 billion and $15.7$7.3 billion of TBA securities, at fair value, respectively. The following table is a summary of our investment portfolio as of March 31, 20182019 and December 31, 20172018 (dollars in millions):
 March 31, 2018 December 31, 2017 March 31, 2019 December 31, 2018
Investment Portfolio (Includes TBAs) 1
 Amortized Cost Fair Value Average Coupon % Amortized Cost Fair Value Average Coupon % Amortized Cost Fair Value Average Coupon % Amortized Cost Fair Value Average Coupon %
Fixed rate Agency RMBS and TBA securities:                                
≤ 15-year:                                
≤ 15-year RMBS $8,916
 $8,789
 3.27% 13% $8,951
 $8,933
 3.31% 12% $7,214
 $7,205
 3.31% 7% $7,386
 $7,294
 3.30% 8%
15-year TBA securities 3,907
 3,926
 3.04% 6% 5,025
 5,015
 2.90% 7% 3,432
 3,457
 3.61% 3% 3,635
 3,673
 3.61% 4%
Total ≤ 15-year 12,823
 12,715
 3.20% 18% 13,976
 13,948
 3.16% 19% 10,646
 10,662
 3.41% 10% 11,021
 10,967
 3.40% 12%
20-year RMBS 712
 711
 3.52% 1% 673
 687
 3.48% 1% 755
 761
 3.95% 1% 778
 774
 3.95% 1%
30-year:                                
30-year RMBS 45,638
 44,196
 3.70% 64% 45,853
 45,406
 3.72% 62% 84,405
 84,536
 3.89% 83% 74,883
 73,685
 3.87% 80%
30-year TBA securities 9,622
 9,685
 3.44% 14% 10,714
 10,727
 3.40% 15% 3,453
 3,498
 3.66% 3% 3,617
 3,649
 4.47% 4%
Total 30-year 55,260
 53,881
 3.66% 78% 56,567
 56,133
 3.65% 77% 87,858
 88,034
 3.88% 86% 78,500
 77,334
 3.90% 84%
Total fixed rate Agency RMBS and TBA securities 68,795
 67,307
 3.57% 97% 71,216
 70,768
 3.55% 97% 99,259
 99,457
 3.83% 97% 90,299
 89,075
 3.84% 97%
Adjustable rate Agency RMBS 265
 268
 2.91% 1% 278
 283
 2.90% 1% 199
 201
 3.14% % 212
 213
 3.10% %
Multifamily 31
 32
 3.56% % 
 
 % %
CMO Agency RMBS:                                
CMO 595
 590
 3.43% 1% 629
 631
 3.43% 1% 555
 555
 3.46% 1% 588
 583
 3.46% 1%
Interest-only strips 95
 100
 4.13% % 101
 112
 4.39% % 74
 84
 3.63% % 77
 84
 3.61% %
Principal-only strips 107
 108
 % % 112
 116
 % % 92
 95
 % % 95
 94
 % %
Total CMO Agency RMBS 797
 798
 3.45% 1% 842
 859
 3.58% 1% 721
 734
 3.22% 1% 760
 761
 3.21% 1%
Total Agency RMBS and TBA securities 69,857
 68,373
 3.56% 99% 72,336
 71,910
 3.55% 99% 100,210
 100,424
 3.82% 98% 91,271
 90,049
 3.83% 98%
Non-Agency RMBS 7
 7
 2.50% % 7
 7
 2.50% % 313
 319
 3.86% % 264
 266
 3.83% 1%
CMBS 28
 29
 6.55% % 28
 29
 6.55% % 343
 353
 3.89% 1% 280
 282
 4.58% %
CRT 848
 884
 5.50% 1% 834
 876
 5.26% % 1,109
 1,129
 5.63% 1% 1,006
 1,012
 5.86% 1%
Total investment portfolio $70,740
 $69,293
 3.59% 100% $73,205
 $72,822
 3.57% 100% $101,975
 $102,225
 3.84% 100% $92,821
 $91,609
 3.85% 100%

1.TBA securities are presented net of long and short positions. For further details of our TBA securities refer to Note 6 of the accompanying consolidated financial statements.
TBA securities are recorded as derivative instruments in our accompanying consolidated financial statements and our TBA dollar roll transactions represent a form of off-balance sheet financing. As of March 31, 20182019 and December 31, 2017,2018, our TBA positions had a net carrying value of $82$70 million and $3$70 million, respectively, reported in derivative assets /(liabilities) on our accompanying consolidated balance sheets. The net carrying value represents the difference between the fair value of the underlying Agency security in the TBA contract and the contract price to be paid or received for the underlying Agency security.
As of March 31, 20182019 and December 31, 2017,2018, the weighted average yield on our investment securities (excluding TBA securities) was 2.93%3.29% and 2.89%3.31%, respectively.



The following tables summarize certain characteristics of our fixed rate Agency RMBS portfolio, inclusive of TBAs, as of March 31, 20182019 and December 31, 20172018 (dollars in millions):
 March 31, 2018 March 31, 2019
 Includes Net TBA Position Excludes Net TBA Position Includes Net TBA Position Excludes Net TBA Position
Fixed Rate Agency RMBS and TBA Securities Par Value 
Amortized
Cost
 Fair Value 
% Lower Loan Balance & HARP 1,2
 
Amortized
Cost Basis
 Weighted Average 
Projected Life
CPR 4
 Par Value 
Amortized
Cost
 Fair Value 
Specified Pool % 1
 
Amortized
Cost Basis
 Weighted Average 
Projected Life
CPR 3
WAC 3
 
Yield 4
 Age (Months)
WAC 2
 
Yield 3
 Age (Months)
Fixed rate              
≤ 15-year              
2.5% $1,991
 $1,998
 $1,965
 47% 101.2% 2.98% 2.13% 66 9% $1,099
 $1,112
 $1,096
 75% 101.1% 2.98% 2.11% 77 10%
3.0% 5,895
 5,942
 5,901
 39% 102.1% 3.50% 2.38% 51 9% 2,343
 2,377
 2,369
 81% 101.7% 3.51% 2.45% 58 9%
3.5% 2,592
 2,670
 2,645
 65% 103.7% 3.98% 2.38% 67 10% 4,594
 4,679
 4,704
 40% 102.2% 4.06% 2.85% 28 12%
4.0% 1,928
 2,001
 1,993
 89% 103.8% 4.40% 2.68% 87 11% 2,257
 2,320
 2,335
 47% 103.2% 4.59% 3.10% 18 12%
4.5% 200
 209
 208
 98% 104.3% 4.87% 3.01% 90 11% 150
 156
 156
 98% 103.9% 4.87% 3.00% 102 12%
≥ 5.0% 3
 3
 3
 23% 102.7% 6.61% 4.64% 126 13% 2
 2
 2
 100% 102.2% 6.59% 4.60% 138 14%
Total ≤ 15-year 12,609
 12,823
 12,715
 55% 102.7% 3.75% 2.42% 66 10% 10,445
 10,646
 10,662
 55% 102.1% 3.85% 2.67% 44 11%
20-year                                  
≤ 3.0% 188
 187
 187
 31% 99.4% 3.55% 3.10% 58 8%
3.5% 352
 359
 359
 74% 102.1% 4.05% 3.00% 61 10% 304
 310
 312
 80% 101.9% 4.05% 3.00% 73 11%
4.0% 104
 108
 108
 74% 103.9% 4.47% 3.16% 34 10% 202
 208
 210
 91% 103.3% 4.44% 3.26% 27 11%
4.5% 52
 56
 55
 99% 106.5% 4.90% 2.96% 88 11% 223
 235
 237
 100% 105.0% 5.00% 3.29% 28 13%
≥ 5.0% 2
 2
 2
 —% 106.0% 5.95% 3.33% 119 16% 2
 2
 2
 —% 105.5% 5.94% 3.33% 132 17%
Total 20-year: 698
 712
 711
 64% 102.0% 4.06% 3.05% 58 10% 731
 755
 761
 89% 103.3% 4.46% 3.16% 46 12%
30-year:              
3.0% 7,015
 6,889
 6,858
 2% 100.2% 3.58% 2.96% 46 6% 3,012
 2,996
 3,005
 3% 100.1% 3.58% 2.97% 50 6%
3.5% 24,235
 25,155
 24,398
 58% 104.5% 4.04% 2.89% 37 6% 30,221
 31,022
 30,806
 51% 102.9% 4.07% 3.07% 38 8%
4.0% 20,473
 21,706
 21,140
 64% 106.6% 4.47% 3.05% 32 7% 35,956
 37,272
 37,419
 68% 103.6% 4.57% 3.39% 24 12%
4.5% 1,218
 1,312
 1,289
 71% 107.7% 4.97% 3.25% 66 9% 15,640
 16,352
 16,587
 73% 104.8% 5.00% 3.61% 15 12%
5.0% 93
 100
 100
 65% 106.9% 5.45% 3.71% 119 9% 128
 137
 139
 120% 106.5% 5.53% 3.72% 63 11%
≥ 5.5% 88
 98
 96
 36% 110.4% 6.18% 3.36% 138 12% 72
 79
 78
 50% 110.0% 6.18% 3.34% 149 13%
Total 30-year 53,122
 55,260
 53,881
 53% 105.1% 4.22% 2.97% 37 7% 85,029
 87,858
 88,034
 61% 103.5% 4.45% 3.31% 28 10%
Total fixed rate $66,429
 $68,795
 $67,307
 54% 104.7% 4.14% 2.88% 42 7% $96,205
 $99,259
 $99,457
 61% 103.3% 4.41% 3.26% 29 10%

1.
Lower loan balance securities representSpecified pools include pools backed by anlower balance loans with original loan balancebalances of ≤ $150,000. Our lower loan balance securities had a weighted average original loan balance of $98,000 and $109,000 for 15-year and 30-year securities, respectively,up to $200K, HARP pools as of March 31, 2018.
2.
HARP securities are defined as pools backed by 100% refinance loans with LTVoriginal LTVs ≥ 80%. Our HARP securities had issued between May 2009 and September 2017, and pools backed by loans 100% originated in New York and Puerto Rico. As of March 31, 2019, lower balance specified pools have a weighted average LTVoriginal loan balance of 114%$111,000 and 136%$117,000 for 15-year and 30-year securities, respectively, asand HARP specified pools have a weighted average original LTV of March 31, 2018.119% and 136% for 15-year and 30-year securities, respectively.
3.2.WAC represents the weighted average coupon of the underlying collateral.
4.3.
Portfolio yield incorporates a projected life CPR assumption based on forward rate assumptions as of March 31, 20182019.





 December 31, 2017 December 31, 2018
 Includes Net TBA Position Excludes Net TBA Position Includes Net TBA Position Excludes Net TBA Position
Fixed Rate Agency RMBS and TBA Securities Par Value 
Amortized
Cost
 Fair Value 
% Lower Loan Balance & HARP 1,2
 
Amortized
Cost Basis
 Weighted Average 
Projected Life
CPR 4
 Par Value 
Amortized
Cost
 Fair Value 
Specified Pool % 1
 
Amortized
Cost Basis
 Weighted Average 
Projected Life
CPR 3
WAC 3
 
Yield 4
 Age (Months)
WAC 2
 
Yield 3
 Age (Months)
Fixed rate              
≤ 15-year              
≤ 2.5% $3,041
 $3,061
 $3,046
 32% 101.2% 2.98% 2.13% 63 9% $1,157
 $1,170
 $1,139
 75% 101.2% 2.98% 2.11% 74 9%
3.0% 5,616
 5,749
 5,724
 33% 102.8% 3.49% 2.18% 62 10% 2,651
 2,677
 2,650
 75% 101.7% 3.51% 2.44% 56 9%
3.5% 2,710
 2,804
 2,804
 75% 103.5% 3.96% 2.42% 69 11% 4,444
 4,498
 4,502
 43% 101.9% 4.07% 2.96% 25 10%
4.0% 2,054
 2,134
 2,145
 89% 103.9% 4.40% 2.68% 84 11% 2,449
 2,507
 2,509
 40% 103.5% 4.47% 2.96% 44 10%
4.5% 215
 224
 225
 98% 104.3% 4.87% 3.01% 88 12% 160
 167
 165
 99% 104.0% 4.87% 3.01% 99 11%
≥ 5.0% 4
 4
 4
 17% 102.8% 6.56% 4.47% 125 44% 2
 2
 2
 100% 102.4% 6.55% 4.57% 134 14%
Total ≤ 15-year 13,640
 13,976
 13,948
 51% 103.0% 3.77% 2.38% 70 10% 10,863
 11,021
 10,967
 54% 102.0% 3.82% 2.68% 46 10%
20-year                                  
≤ 3.0% 195
 193
 198
 31% 99.4% 3.55% 3.10% 55 9%
3.5% 365
 373
 380
 75% 102.1% 4.05% 3.00% 58 11% 314
 320
 318
 80% 102.0% 4.05% 3.00% 70 10%
4.0% 45
 47
 48
 51% 104.2% 4.54% 2.96% 76 11% 206
 214
 213
 91% 103.4% 4.45% 3.28% 24 10%
4.5% 55
 58
 59
 99% 106.5% 4.90% 2.95% 85 11% 230
 242
 241
 100% 105.2% 5.00% 3.35% 25 11%
≥ 5.0% 2
 2
 2
 —% 106.0% 5.95% 3.32% 116 17% 2
 2
 2
 —% 105.7% 5.94% 3.34% 128 16%
Total 20-year: 662
 673
 687
 62% 101.8% 4.02% 3.02% 61 10% 752
 778
 774
 89% 103.4% 4.46% 3.19% 44 11%
30-year:              
≤ 3.0% 7,583
 7,576
 7,592
 1% 100.2% 3.58% 2.96% 43 6% 3,178
 3,133
 3,108
 3% 100.1% 3.58% 2.97% 47 6%
3.5% 24,045
 25,072
 24,800
 56% 104.6% 4.04% 2.84% 35 7% 22,410
 23,258
 22,496
 71% 103.2% 4.06% 3.05% 38 6%
4.0% 21,015
 22,348
 22,166
 64% 106.5% 4.47% 2.99% 29 9% 37,230
 38,564
 38,147
 61% 103.8% 4.54% 3.44% 24 8%
4.5% 1,271
 1,366
 1,369
 71% 107.4% 4.98% 3.18% 62 10% 12,777
 13,319
 13,361
 69% 104.7% 4.99% 3.75% 14 9%
5.0% 97
 103
 104
 65% 106.6% 5.45% 3.69% 116 10% 133
 143
 142
 117% 106.8% 5.53% 3.80% 61 9%
≥ 5.5% 92
 102
 102
 36% 110.0% 6.18% 3.34% 135 14% 75
 83
 80
 49% 110.5% 6.17% 3.35% 147 12%
Total 30-year 54,103
 56,567
 56,133
 52% 105.2% 4.23% 2.93% 34 8% 75,803
 78,500
 77,334
 63% 103.6% 4.41% 3.34% 28 8%
Total fixed rate $68,405
 $71,216
 $70,768
 52% 104.8% 4.15% 2.84% 40 8% $87,418
 $90,299
 $89,075
 62% 103.5% 4.36% 3.28% 30 8%

________________________________
1.Lower loanSee Note 1 in table above for specified pool composition. As of December 31, 2018, lower balance securities representspecified pools backed by an original loan balance of ≤ $150,000. Our lower loan balance securities hadhave a weighted average original loan balance of $97,000$102,000 and $109,000$113,000 for 15-year and 30-year securities, respectively, as of December 31, 2017.
2.and HARP securities are defined asspecified pools backed by 100% refinance loans with LTVs ≥ 80%. Our HARP securities hadhave a weighted average original LTV of 114%119% and 136% for 15-year and 30-year securities, respectively, as of December 31, 2017.respectively.
3.2.WAC represents the weighted average coupon of the underlying collateral.
4.3.Portfolio yield incorporates a projected life CPR assumption based on forward rate assumptions as of December 31, 2017.2018.
As of March 31, 20182019 and December 31, 2017,2018, our investments in CRT and non-Agency securities had the following credit ratings:
 March 31, 2018 December 31, 2017 March 31, 2019 December 31, 2018
CRT and Non-Agency Security Credit Ratings 1
 CRT RMBS CMBS CRT RMBS CMBS CRT RMBS CMBS CRT RMBS CMBS
AAA $
 $7
 $
 $
 $7
 $
 $
 $156
 $62
 $
 $160
 $52
AA 
 42
 190
 
 17
 152
A 17
 45
 33
 17
 33
 15
BBB 26
 
 29
 20
 
 29
 54
 63
 58
 25
 43
 53
BB 139
 
 
 136
 
 
 412
 8
 10
 492
 8
 10
B 698
 
 
 691
 
 
 600
 2
 
 453
 2
 
Not Rated 21
 
 
 29
 
 
 46
 3
 
 25
 3
 
Total $884
 $7
 $29
 $876
 $7
 $29
 $1,129
 $319
 $353
 $1,012
 $266
 $282
 ________________________________
1.Represents the lowest of Standard and Poor's ("S&P"), Moody's, Fitch, DBRS, Kroll Bond Rating Agency ("KBRA") and FitchMorningstar credit ratings, stated in terms of the S&P equivalent rating as of each date.


Our CRT securities reference the performance of loans underlying Agency RMBS issued by Fannie Mae or Freddie Mac, which were subject to their underwriting standards. As of March 31, 2018,2019, our CRT securities had floating and fixed rate coupons ranging from 3.7%3.0% to 8.8%, referenced to loans originated between 20122011 and 2018 with weighted average coupons ranging from 3.6%


3.7% to 4.4%4.9%. As of December 31, December 31, 2017,2018, our CRT securities had floating rate coupons ranging from 3.9% to 8.5%9.5%, referenced to loans originated between 20122011 and 20172018 with weighted average coupons ranging from 3.6%3.8% to 4.4%4.8%.


RESULTS OF OPERATIONS
Non-GAAP Financial Measures
In addition to the results presented in accordance with GAAP, our results of operations discussed below include certain non-GAAP financial information, including "economic interest income",income," "economic interest expense," "net spread and dollar roll income," "net spread and dollar roll income, excluding 'catch-up' premium amortization," "estimated taxable income" and the related per common share measures and certain financial metrics derived from such non-GAAP information, such as "cost of funds" and "net interest margin.spread."
"Economic interest income" is measured as interest income (GAAP measure), adjusted (i) to (i) exclude "catch-up" premium amortization associated with changes in CPR estimates and (ii) to (ii) include TBA dollar roll implied interest income. "Economic interest expense" is measured as interest expense (GAAP measure) adjusted to include TBA dollar roll implied interest expense and interest rate swap periodic costs.income/(cost). "Net spread and dollar roll income, excluding "catch-up" premium amortization" includes (i) the components of economic interest income and economic interest expense and dividends on REIT equity securities ("adjustedother miscellaneous dividend and interest income (referred to as "adjusted net interest and dollar roll income"), less (ii) total operating expenses (GAAP measure), adjusted to exclude non-recurring transaction costs (referred to as "adjusted operating expenses"), net of management fee income (GAAP measure) ("other operating, adjusted, as applicable, to exclude one-time expenses and non-recurring termination fee income (expense), net)."recognized in connection with the sale of MTGE Investment Corp. and corresponding termination of the Company's management agreement with MTGE.
By providing such measures, in addition to the related GAAP measures, we believe we give greater transparency into the information used by our management in its financial and operational decision-making. We also believe it is important for users of our financial information to consider information related to our current financial performance without the effects of certain measures and one-time events that are not necessarily indicative of our current investment portfolio performance and operations.
Specifically, in the case of "adjusted net interest and dollar roll income," we believe the inclusion of TBA dollar roll income is meaningful as TBAs, which are accounted for under GAAP as derivative instruments with gains and losses recognized in other gain (loss) in our consolidated statement of comprehensive income, are economically equivalent to holding and financing generic Agency RMBS using short-term repurchase agreements. Similarly, we believe that the inclusion of periodic interest rate swap settlements in such measure and in "economic interest expense" is meaningful as interest rate swaps are the primary instrument we use to economically hedge against fluctuations in our borrowing costs and it is more indicative of our total cost of funds than interest expense alone. In the case of "economic interest income" and "net spread and dollar roll income, excluding 'catch-up' premium amortization," we believe the exclusion of "catch-up" adjustments to premium amortization cost or benefit is meaningful as it excludes the cumulative effect from prior reporting periods due to current changes in future prepayment expectations and, therefore, exclusion of such cost or benefit is more indicative of the current earnings potential of our investment portfolio. We also believe the exclusion of issuance costs of redeemed preferred stock reported as a reduction to net income available to common stockholders under GAAP and transactions costs associated with our acquisition of AMM reported in general, administrative and other expense under GAAP is meaningful as they represent non-recurring transaction costs and are not representative of our ongoing operating costs. In the case of estimated taxable income, we believe it is meaningful information because it directly relates to the amount of dividends we are required to distribute to maintain our REIT qualification status.
However, because such measures are incomplete measures of our financial performance and involve differences from results computed in accordance with GAAP, they should be considered as supplementary to, and not as a substitute for, results computed in accordance with GAAP. In addition, because not all companies use identical calculations, our presentation of such non-GAAP measures may not be comparable to other similarly-titled measures of other companies. Furthermore, estimated taxable income can include certain information that is subject to potential adjustments up to the time of filing our income tax returns, which occurs after the end of our fiscal year.
Selected Financial Data


The following selected financial data is derived from our interim consolidated financial statements and the notes thereto. The tables below present our condensed consolidated balance sheets as of March 31, 20182019 and December 31, 20172018 and our condensed consolidated statements of comprehensive income and key statistics for the three months ended March 31, 20182019 and 20172018 (in millions, except per share amounts):



($ in Millions, Except Per Share Amounts)        
Balance Sheet Data March 31, 2018 December 31, 2017 March 31, 2019 December 31, 2018
Investment securities, at fair value $55,682
 $57,080
 $95,270
 $84,287
Total assets $69,221
 $70,376
 $118,807
 $109,241
Repurchase agreements and other debt $49,292
 $50,653
 $86,951
 $75,992
Total liabilities $60,883
 $61,622
 $108,306
 $99,335
Total stockholders' equity $8,338
 $8,754
 $10,501
 $9,906
Net book value per common share 1
 $20.03
 $21.09
 $18.21
 $17.54
Tangible net book value per common share 2
 $18.63
 $19.69
 $17.23
 $16.56
 Three Months Ended March 31, Three Months Ended March 31,
Statement of Comprehensive Income Data 2018 2017 2019 2018
Interest income $431
 $296
 $705
 $431
Interest expense 206
 98
 541
 206
Net interest income 225
 198
 164
 225
Other gain (loss), net 217
 (104) 120
 217
Operating expenses 18
 18
 19
 18
Net income 424
 76
 265
 424
Dividend on preferred stock 9
 7
 10
 9
Net income available to common stockholders $415
 $69
 $255
 $415
        
Net income $424
 $76
 $265
 $424
Other comprehensive income (loss) (621) 46
Other comprehensive income (loss), net 400
 (621)
Comprehensive income (loss) (197) 122
 665
 (197)
Dividend on preferred stock 9
 7
 10
 9
Comprehensive income (loss) available (attributable) to common stockholders $(206) $115
 $655
 $(206)
        
Weighted average number of common shares outstanding - basic 391.3
 331.0
 536.7
 391.3
Weighted average number of common shares outstanding - diluted 391.5
 331.1
 537.2
 391.5
Net income per common share - basic and diluted $1.06
 $0.21
Comprehensive income per common share - basic and diluted $(0.53) $0.35
Net income per common share - basic $0.48
 $1.06
Net income per common share - diluted $0.47
 $1.06
Comprehensive income (loss) per common share - basic and diluted $1.22
 $(0.53)
Dividends declared per common share $0.54
 $0.54
 $0.54
 $0.54
 Three Months Ended March 31, Three Months Ended March 31,
Other Data (Unaudited) * 2018 2017 2019 2018
Average investment securities - at par $53,986 $42,218 $87,021
 $53,986
Average investment securities - at cost $56,573 $44,215 $89,952
 $56,573
Average net TBA portfolio - at cost $15,585 $13,460 $8,002
 $15,585
Average total assets - at fair value $68,781 $55,029 $114,994
 $68,781
Average Agency repurchase agreements and other debt outstanding 3
 $49,567 $39,203 $82,070
 $49,567
Average stockholders' equity 4
 $8,535 $7,310 $10,186
 $8,535
Average tangible net book value "at risk" leverage 5
 8.2:1
 7.8:1
 9.3:1
 8.2:1
Tangible net book value "at risk" leverage (as of period end) 6
 8.2:1
 8.0:1
 9.4:1
 8.2:1
Economic return on tangible common equity, unannualized 7
 (2.6)% 1.8%
Expenses % of average total assets, annualized 0.10 % 0.13%
Expenses % of average assets, including average net TBA position, annualized 0.09 % 0.10%
Expenses % of average stockholders' equity, annualized 0.84 % 0.98%
Economic return on tangible common equity 7
 7.3% (2.6)%
Expenses % of average total assets 0.07% 0.10 %
Expenses % of average assets, including average net TBA position 0.06% 0.09 %
Expenses % of average stockholders' equity 0.75% 0.84 %

* Except as noted below, average numbers for each period are weighted based on days on our books and records.


1.Net book value per common share is calculated as our total stockholders' equity, less our preferred stock liquidation preference, divided by our number of common shares outstanding as of period end.


2.Tangible net book value per common share excludes goodwill and other intangible assets, net.goodwill.
3.Other debt includes debt of consolidated VIEs. Amount excludes U.S. Treasury repo agreements and TBA contracts.
4.Average stockholders' equity calculated as our average month-ended stockholders' equity during the period.
5.Average tangible net book value "at risk" leverage is calculated by dividing the sum of our daily weighted average mortgage borrowings outstanding (Agency repo, other debt and TBA securities (at cost)) for the period by the sum of our average stockholders' equity less our average investment in REIT equity securities,adjusted to exclude goodwill and other intangible assets, net for the period. Leverage excludes U.S. Treasury repurchase agreements.
6."At risk" leverage as of period end is calculated by dividing the sum of our mortgage borrowings outstanding and our receivable/payable for unsettled investment securities as of period end (at cost) by the sum of our total stockholders' equity less the fair valueadjusted to exclude goodwill as of investments in REIT equity securities, goodwill and other intangible assets, net at period end. Leverage excludes U.S. Treasury repurchase agreements.
7.Economic return on tangible common equity represents the sum of the change in our tangible net book value per common share and our dividends declared on common stock during the period over our beginning tangible net book value per common share.

Economic Interest Income and Asset Yields
The following table summarizes our economic interest income (a non-GAAP measure) for the three months ended March 31, 20182019 and 20172018, which includes the combination of interest income (a GAAP measure) on our holdings reported as investment securities on our consolidated balance sheets, adjusted to exclude estimated "catch-up" premium amortization adjustments due to changes in our CPR forecast, and implied interest income on our TBA securities (dollars in millions):
Three Months Ended March 31,Three Months Ended March 31,
2018 20172019 2018
Amount Yield Amount YieldAmount Yield Amount Yield
Interest income:              
Cash/coupon interest income$500
 3.70 % $385
 3.65 %$847
 3.89 % $500
 3.70 %
Net premium amortization(69) (0.65)% (89) (0.97)%(142) (0.75)% (69) (0.65)%
Interest income (GAAP measure)431
 3.05 % 296
 2.68 %705
 3.14 % 431
 3.05 %
Estimated "catch-up" premium amortization (benefit) cost due to change in CPR forecast(21) (0.15)% 9
 0.08 %
Estimated "catch-up" premium amortization cost (benefit) due to change in CPR forecast39
 0.17 % (21) (0.15)%
Interest income, excluding "catch-up" premium amortization410
 2.90 % 305
 2.76 %744
 3.31 % 410
 2.90 %
TBA dollar roll income - implied interest income 1,2
120
 3.08 % 90
 2.69 %71
 3.55 % 120
 3.08 %
Economic interest income, excluding "catch-up" amortization (non-GAAP measure) 3
$530
 2.94 % $395
 2.74 %$815
 3.33 % $530
 2.94 %
              
Weighted average actual portfolio CPR for investment securities held during the period8.6%   10.7%  6.3%   8.6%  
Weighted average projected CPR for the remaining life of investment securities held as of period end7.6%   8.2%  10.5%   7.6%  
Average 30-year fixed rate mortgage rate as of period end 4
4.44%   4.14%  4.06%   4.44%  
10-year U.S. Treasury rate as of period end2.74%   2.39%  2.41%   2.74%  
  ________________________________
1.Reported in gain (loss) on derivatives instruments and other securities, net in the accompanying consolidated statements of operations.
2.
Implied interest income from TBA dollar roll transactions is computed as the sum of (i) our TBA dollar roll income and (ii) our estimated TBA implied funding cost (see Economic Interest Expense and Aggregate Cost of Funds below). TBA dollar roll income represents the price differential, or "price drop," between the TBA price for current month settlement versus the TBA price for forward month settlement and is the economic equivalent to interest income on the underlying Agency securities, less an implied funding cost, over the forward settlement period. Amount is net of TBAs used for hedging purposes. Amount excludes TBA mark-to-market adjustments (see .adjustments.
3.The combined asset yield is calculated on a weighted average basis based on our average investment and TBA balances outstanding during the period and their respective yields.
4.Source: Freddie Mac Primary Fixed Mortgage Rate Mortgage Market Survey
The principal elements impacting our economic interest income are the size of our average investment portfolio and the yield (actual orand implied) on our securities. The following istable includes a summary of the estimated impact of each of these elements on our economic interest income for the three months ended March 31, 2018,2019, compared to the prior year period (in millions):


Impact of Changes in the Principal Elements Impacting Economic Interest Income
Three Months Ended March 31, 2018 vs. March 31, 2017
Three Months Ended March 31, 2019 vs. March 31, 2018Three Months Ended March 31, 2019 vs. March 31, 2018
  Due to Change in Average   Due to Change in Average
Total Increase /
(Decrease)
 
Portfolio
Size
 
Asset
Yield
 
Total Increase /
(Decrease)
 
Portfolio
Size
 
Asset
Yield
Interest Income (GAAP measure)$135
 $83
 $52
 $274
 $254
 $20
Estimated "catch-up" premium amortization cost due to change in CPR forecast(30) 
 (30)
Interest income, excluding "catch-up" premium amortization cost105
 83
 22
Estimated "catch-up" premium amortization due to change in CPR forecast 60
 
 60
Interest income, excluding "catch-up" premium amortization 334
 254
 80
TBA dollar roll income - implied interest income30
 23
 7
 (49) (51) 2
Economic interest income, excluding "catch-up" amortization (non-GAAP measure)$135
 $106
 $29
 $285
 $203
 $82


The size of ourOur average investment portfolio, inclusive of TBAs, increased 25%36% (at cost) fromfor the three months ended March 31, 2019, compared to the prior year period, consistingin line with the deployment of a 28% increase in holdings reported as investment securitiesnew equity capital and a 16% increase in TBA securities reported as derivative assets/(liabilities) on our consolidated balance sheets. Thean increase in our investment portfolio was primarily a function oftangible equity issuances during 2017."at risk" leverage ratio. The increase in our average asset yield on our investment portfolio to 2.94% for the three months ended March 31, 2018, from 2.74% forover the prior year period was largely due to changes in asset composition, as we increased our holdings of higher coupon, 30-year fixed rate securities relative to shorter duration assets and lower prepayment speeds in line with higher interest rates.assets.
Leverage
Our primary measure of leverage is our tangible net book value "at risk" leverage ratio. Tangible net book value "at risk" leverageratio, which is measured as the sum of our Agency repurchase agreements, and other debt used to fund our investment securities and our net TBA position (at cost) (together referred to as "mortgage borrowings") and our net receivable/payable for unsettled investment securities, divided by the sum of our total stockholders' equity adjusted to exclude goodwill and other intangible assets.asset.
We include our net TBA position in our measure of leverage because a forward contract to acquire Agency RMBS in the TBA market carries similar risks to Agency RMBS purchased in the cash market and funded with on-balance sheet liabilities. Similarly, a TBA contract for the forward sale of Agency securities has substantially the same effect as selling the underlying Agency RMBS and reducing our on-balance sheet funding commitments. (Refer to Liquidity and Capital Resources for further discussion of TBA securities and dollar roll transactions). Repurchase agreements used to fund short-term investments in U.S. Treasury securities ("U.S. Treasury repo") are excluded from our measure of leverage due to the temporary and highly liquid nature of these investments.
Our tangible net book value "at risk" leverage wasincreased to 9.4x as of March 31, 2019, compared to 9.0x as of December 31, 2018 and 8.2x and 8.1x as of March 31, 2018, in light of improved overall levered returns on Agency RMBS and December 31, 2017, respectively.the availability of suitable financing. The table below presents a summary of our leverage ratios for the periods listed (dollars in millions):
 
Agency Repurchase Agreements and Other Debt 1
 
Net TBA Position
Long/(Short)
2 
 
Average Tangible Net Book Value
"At Risk" Leverage during the Period 3
 
Average
"At Risk" Leverage during the Period
4
 
Tangible Net Book Value "At Risk" Leverage
as of
Period End 3
 
"At Risk" Leverage
as of
Period End
5
 
Agency Repurchase Agreements and Other Debt 1
 
Net TBA Position
Long/(Short)
2 
 
Average Tangible Net Book Value
"At Risk" Leverage during the Period 3
 
Average
"At Risk" Leverage during the Period
4
 
Tangible Net Book Value "At Risk" Leverage
as of
Period End 3
 
"At Risk" Leverage
as of
Period End
5
Quarter Ended 
Average Daily
Amount
 
Maximum
Daily Amount
 
Ending
Amount
 
Average Daily
Amount
 
Ending
Amount
  
Average Daily
Amount
 
Maximum
Daily Amount
 
Ending
Amount
 
Average Daily
Amount
 
Ending
Amount
 
March 31, 2019 $82,070
 $87,877
 $86,590
 $8,002
 $6,885
 9.3:1 8.8:1 9.4:1 9.0:1
December 31, 2018 $68,499
 $77,442
 $75,992
 $8,066
 $7,252
 8.4:1 7.9:1 9.0:1 8.5:1
March 31, 2018 $49,567
 $50,645
 $49,292
 $15,585
 $13,529
 8.2:1 7.7:1 8.2:1 7.6:1 $49,567
 $50,645
 $49,292
 $15,585
 $13,529
 8.2:1 7.7:1 8.2:1 7.6:1
December 31, 2017 $48,122
 $51,322
 $50,653
 $18,355
 $15,739
 8.1:1 7.6:1 8.1:1 7.6:1
March 31, 2017 $39,203
 $41,221
 $39,809
 $13,460
 $14,377
 7.8:1 7.2:1 8.0:1 7.4:1

1.Other debt includes debt of consolidated VIEs. Amounts exclude U.S. Treasury repo agreements.
2.Daily average and ending net TBA position outstanding measured at cost.
3.Tangible net book value "at risk" leverage includes the components of "at risk" leverage with stockholders' equity adjusted to exclude goodwill and other intangible assets, net.
4.Average "at risk" leverage during the period was calculated by dividing the sum of our daily weighted average mortgage borrowings outstanding during the period by the sum of our average month-ended stockholders' equity less our average investment in REIT equity securities for the period.
5."At risk" leverage as of period end is calculated by dividing the sum of our mortgage borrowings outstanding and our receivable/payable for unsettled investment securities as of period end (at cost) by the sum of our total stockholders' equity less the fair value of investments in REIT equity securities at period end. Leverage excludes U.S. Treasury repo agreements.
Economic Interest Expense and Aggregate Cost of Funds
The following table summarizes our economic interest expense and aggregate cost of funds (non-GAAP measures) for the three months ended March 31, 20182019 and 20172018 (dollars in millions), which includes the combination of interest expense on Agency repurchase agreements and other debt (GAAP measure), implied interest expense on our TBA securities and periodic interest rate swap costs:periodic interest (income) cost:


 Three Months Ended March 31, Three Months Ended March 31,
 2018 2017 2019 2018
Economic Interest Expense and Aggregate Cost of Funds 1
 Amount Cost of Funds Amount Cost of Funds Amount Cost of Funds Amount Cost of Funds
Repurchase agreement and other debt - interest expense (GAAP measure) $206
 1.69% $98
 1.01% $541
 2.64 % $206
 1.69%
TBA dollar roll income - implied interest expense 2,3
 58
 1.49% 19
 0.58% 52
 2.60 % 58
 1.49%
Economic interest expense - before interest rate swap costs 4
 264
 1.62% 117
 0.89% 593
 2.64 % 264
 1.62%
Periodic interest costs of interest rate swaps reported in gain (loss) on derivative instruments and other securities, net 5
 9
 0.06% 45
 0.34%
Interest rate swap periodic interest (income) cost, net 2,5
 (83) (0.37)% 9
 0.06%
Total economic interest expense (non-GAAP measure) $273
 1.68% $162
 1.23% $510
 2.27 % $273
 1.68%
 ________________________________


1.Amounts exclude interest rate swap termination fees and variation margin settlements paid or received, forward starting swaps orand the impact of other supplemental hedges, such as swaptions and U.S. Treasury positions.
2.Reported in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income.
3.The implied funding cost of TBA dollar roll transactions is determined using the price differential, or "price drop," between the TBA price for current month settlement versus the TBA price for forward month settlement and market based assumptions regarding the "cheapest-to-deliver" collateral that can be delivered to satisfy the TBA contract, such as the anticipated collateral’s weighted average coupon, weighted average maturity and projected 1-month CPR.  The average implied funding cost for all TBA transactions is weighted based on our daily average TBA balance outstanding for the period.
4.The combined cost of funds for total mortgage borrowings outstanding, before interest rate swap costs, is calculated on a weighted average basis based on average repo, other debt and TBA balances outstanding during the period and their respective cost of funds.
5.Interest rate swap periodic interest (income) cost of fundsis measured as a percent of average mortgage borrowings outstanding for the period.


The principal elements impacting our economic interest expense are (i) the size of our average mortgage borrowings and interest rate swap portfolio outstanding during the period, (ii) the average interest rate (actual orand implied) on our mortgage borrowings and (iii) the average net interest rate paid/received on our interest rate swaps. The following istable includes a summary of the estimated impact of these elements on our economic interest expense for the three months ended March 31, 2018,2019, compared to the prior year period (in millions):
Impact of Changes in the Principal Elements of Economic Interest Expense
Three Months Ended March 31, 2018 vs. March 31, 2017
Three Months Ended March 31, 2019 vs. March 31, 2018Three Months Ended March 31, 2019 vs. March 31, 2018
  Due to Change in Average   Due to Change in Average
Total Increase / (Decrease) Borrowing / Swap Balance Borrowing / Swap Rate Total Increase / (Decrease) Borrowing / Swap Balance Borrowing / Swap Rate
Repurchase agreements and other debt interest expense

$108
 $26
 $82
 $335
 $138
 $197
TBA dollar roll income - implied interest expense39
 3
 36
 (6) (28) 22
Periodic interest rate swap costs(36) 7
 (43)
Interest rate swap periodic interest income/cost (92) 1
 (93)
Total change in economic interest expense$111
 $36
 $75
 $237
 $111
 $126
Our average mortgage borrowings, inclusive of TBAs, increased by 38% for the three months ended March 31, 2019 compared to the prior year period as a function of our higher asset base. The increase in the average interest rate (actual and implied) on our mortgage borrowings increased for current year periodswas largely due toa function of increases in the federal fundsFederal Funds rate which were partly offset by the benefit of shifting a larger portion of our total Agency repo funding through our captive broker-dealer subsidiary, Bethesda Securities, LLC ("BES").during fiscal year 2018. The decrease in our periodic swap costs was due to an increase in the floatingreceive-floating rate received onleg of our pay-fixed receive-floating interest rate swaps and a smaller swap portfolio relativeresetting to our total mortgage borrowings, partly offset by a higher average pay rate.prevailing three-month LIBOR rates.
The table below presents a summary of the ratio of our average interest rates swaps outstanding, excluding forward starting swaps, to our average mortgage borrowings for the three months ended March 31, 20182019 and 20172018 (dollars in millions):
 Three Months Ended March 31, Three Months Ended March 31,
Average Ratio of Interest Rate Swaps (Excluding Forward Starting Swaps) to Mortgage Borrowings Outstanding 2018 2017 2019 2018
Average Agency repo and other debt outstanding $49,567
 $39,203
 $82,070
 $49,567
Average net TBA portfolio outstanding - at cost $15,585
 $13,460
 $8,002
 $15,585
Average mortgage borrowings outstanding $65,152
 $52,663
 $90,072
 $65,152
Average notional amount of interest rate swaps outstanding (excluding forward starting swaps) $41,021
 $35,769
 $45,158
 $41,021
Ratio of average interest rate swaps to mortgage borrowings outstanding 63 % 68 % 50 % 63 %
        
Average interest rate swap pay-fixed rate (excluding forward starting swaps) 1.72 % 1.49 % 1.97 % 1.72 %
Average interest rate swap receive-floating rate (1.63)% (0.99)% (2.72)% (1.63)%
Average interest rate swap net pay/(receive) rate 0.09 % 0.50 % (0.75)% 0.09 %


For the three months ended March 31, 20182019 and 2017,2018, we had an average forward starting swap balance of $3.4$5.9 billion and $0.6$3.4 billion, respectively. Forward starting interest rate swaps do not impact our economic interest expense and aggregate cost of funds until they commence accruing net interest settlements on their forward start dates. Including forward starting swaps, our average ratio of interest rate swaps outstanding to our average mortgage borrowings was 57% and 68% for the three months ended March 31, 2019 and 2018, and 2017 was 68% and 69%, respectively.


Net Interest MarginSpread
The following table presents a summary of our net interest marginspread (including the impact of TBA dollar roll income, and interest rate swap costsswaps and excluding "catch-up" premium amortization) for the three months ended March 31, 20182019 and 2017:2018:
 Three Months Ended March 31, Three Months Ended March 31,
Investment and TBA Securities - Net Interest Margin 2018 2017
Investment and TBA Securities - Net Interest Spread 2019 2018
Average asset yield, excluding "catch-up" premium amortization 2.94 % 2.74 % 3.33 % 2.94 %
Average aggregate cost of funds (1.68)% (1.23)% (2.27)% (1.68)%
Average net interest margin, excluding "catch-up" premium amortization 1.26 % 1.51 %
Average net interest spread, excluding "catch-up" premium amortization 1.06 % 1.26 %
Net Spread and Dollar Roll Income
The following table presents a summary of our net spread and dollar roll income, excluding estimated "catch-up" premium amortization, per diluted common share (a non-GAAP financial measure) and a reconciliation to our net interest income (the most comparable GAAP financial measure) for the three months ended March 31, 20182019 and 20172018 (dollars in millions):
 Three Months Ended March 31, Three Months Ended March 31,
 2018 2017 2019 2018
Net interest income (GAAP measure) $225
 $198
 $164
 $225
TBA dollar roll income, net 1
 62
 71
 19
 62
Periodic interest costs of interest rate swaps, net 1
 (9) (45)
Dividend income from REIT equity securities 1
 1
 
Interest rate swap periodic interest income (cost), net 1
 83
 (9)
Other interest and dividend income 1
 3
 1
Adjusted net interest and dollar roll income 279
 224
 269
 279
Other operating income (expense):        
Management fee income 4
 4
 
 4
Operating expenses (18) (18) (19) (18)
Adjusted operating income (expense), net (14) (14)
Adjusted other operating income (expense), net (19) (14)
Net spread and dollar roll income 265
 210
 250
 265
Dividend on preferred stock 9
 7
 10
 9
Net spread and dollar roll income available to common stockholders (non-GAAP measure) 256
 203
 240
 256
Estimated "catch-up" premium amortization (benefit) cost due to change in CPR forecast (21) 9
 39
 (21)
Net spread and dollar roll income, excluding "catch-up" premium amortization, available to common stockholders (non-GAAP measure) $235
 $212
 $279
 $235
        
Weighted average number of common shares outstanding - basic 391.3
 331.0
 536.7
 391.3
Weighted average number of common shares outstanding - diluted 391.5
 331.1
 537.2
 391.5
Net spread and dollar roll income per common share - basic $0.65
 $0.61
 $0.45
 $0.65
Net spread and dollar roll income per common share - diluted $0.65
 $0.61
 $0.45
 $0.65
Net spread and dollar roll income, excluding "catch-up" premium amortization, per common share - basic $0.60
 $0.64
 $0.52
 $0.60
Net spread and dollar roll income, excluding "catch-up" premium amortization, per common share - diluted $0.60
 $0.64
 $0.52
 $0.60

1.Reported in gain (loss) on derivative instruments and other securities, net in our consolidated statements of comprehensive income
Net spread and dollar roll income, excluding "catch-up" premium amortization adjustments, for the three months ended March 31, 2018 decreased $(0.04) per diluted common share, or (6)%, to $0.60 per diluted common share, compared to $0.64 per diluted common share for the prior year period, primarily due to higher funding costs.


Gain (Loss) on Investment Securities, Net
During the three months ended March 31, 2019, the average fair value of our investment portfolio increased 169 basis points to 100.2% of the weighted average cost basis as of March 31, 2019 due to the decline in long-term interest rates and the outperformance of specified Agency RMBS with favorable prepayment characteristics. During the prior year period, the average fair value of our investment portfolio declined 200 basis points to 97.3% of the weighted average cost basis as of March 31, 2018, due to higher interest rates and lower pay-up values for specified Agency RMBS.


The following table is a summary of our net gain (loss) on investment securities for the three months ended March 31, 20182019 and 20172018 (in millions):
 Three Months Ended March 31, Three Months Ended March 31,
Gain (Loss) on Investment Securities, Net 1
 2018 2017 2019 2018
Loss on sale of investment securities, net $(2) $(84)
Gain (loss) on sale of investment securities, net $60
 $(2)
Unrealized gain (loss) on investment securities measured at fair value through net income, net 2
 (523) 16
 1,060
 (523)
Unrealized gain (loss) on investment securities measured at fair value through other comprehensive income, net (621) 46
 400
 (621)
Total gain (loss) on investment securities, net $(1,146) $(22) $1,520
 $(1,146)

1.Amounts exclude gain (loss) on TBA securities, which are reported in gain (loss) on derivative instruments and other securities, net in our Consolidated Statements of Comprehensive Income.
2.Investment securities acquired after fiscal year 2016 are measured at fair value through net income (see Note 3 of our Consolidated Financial Statements in this Form 10-Q).
Gain (Loss) on Derivative Instruments and Other Securities, Net
The following table is a summary of our gain (loss) on derivative instruments and other securities, net for the three months ended March 31, 20182019 and 20172018 (in millions):
Three Months Ended March 31,Three Months Ended March 31,
2018 20172019 2018
Periodic interest costs of interest rate swaps, net$(9) $(45)
Interest rate swap periodic interest income (cost), net$83
 $(9)
Realized gain (loss) on derivative instruments and other securities, net:      
TBA securities - dollar roll income, net62
 71
19
 62
TBA securities - mark-to-market net loss(432) (250)
TBA securities - mark-to-market net gain (loss)65
 (432)
Payer swaptions6
 
(10) 6
U.S. Treasury securities - long position
 1

 
U.S. Treasury securities - short position3
 6
(66) 3
U.S. Treasury futures - short position110
 2
(45) 110
Interest rate swaps - termination fees and variation margin settlements, net582
 267
(699) 582
REIT equity securities1
 
Other
 1
(6) 1
Total realized gain (loss) on derivative instruments and other securities, net332
 98
(742) 332
Unrealized gain (loss) on derivative instruments and other securities, net:      
TBA securities - mark-to-market net gain78
 218
TBA securities - mark-to-market net gain (loss)(1) 78
Interest rate swaps90
 (200)20
 90
Payer swaptions85
 (11)(17) 85
U.S. Treasury securities - short position209
 (84)(359) 209
U.S. Treasury futures - short position(48) (14)14
 (48)
Other1
 (2)2
 1
Total unrealized gain (loss) on derivative instruments and other securities, net415
 (93)(341) 415
Total gain (loss) on derivative instruments and other securities, net$738
 $(40)$(1,000) $738
For further details regarding our use of derivative instruments and related activity refer to Notes 3 and 6 of our Consolidated Financial Statements in this Form 10-Q.
Estimated Taxable Income
For the three months ended March 31, 20182019 and 2017,2018, we had estimated taxable income available to common stockholders of $196 million and $80 million (or $0.36 and $30 million (or $0.20 and $0.09 per diluted common share), respectively. Income as determined under GAAP differs from income as determined under U.S. federal income tax rules because of both temporary and permanent differences in income and expense recognition. The primary differences are (i) unrealized gains and losses on derivative instruments and other securities marked-to-market in current income for GAAP purposes, but excluded from taxable income until realized or settled, (ii) timing differences, both temporary and potentially permanent, in the recognition of certain realized gains and losses and (iii) temporary differences


related to the amortization of premiums and discounts on investments. Furthermore, our estimated taxable income is subject to potential adjustments up to the time of filing our appropriate tax returns, which occurs after the end of our


fiscal year. The following is a reconciliation of our GAAP net income to our estimated taxable income for the three months ended March 31, 20182019 and 20172018 (dollars in millions, except per share amounts):
Three Months Ended March 31,Three Months Ended March 31,
2018 20172019 2018
Net income$424
 $76
$265
 $424
Estimated book to tax differences:      
Premium amortization, net(23) (3)54
 (23)
Realized gain/loss, net(652) (379)627
 (652)
Net capital loss/(utilization of net capital loss carryforward)245
 276
(12) 245
Unrealized gain/loss, net108
 77
Unrealized (gain)/loss, net(719) 108
Other(13) (10)(9) (13)
Total book to tax differences(335) (39)(59) (335)
Estimated REIT taxable income89
 37
206
 89
Dividend on preferred stock9
 7
10
 9
Estimated REIT taxable income available to common stockholders$80
 $30
$196
 $80
Weighted average number of common shares outstanding - basic391.3
 331.0
536.7
 391.3
Weighted average number of common shares outstanding - diluted391.5
 331.1
537.2
 391.5
Estimated REIT taxable income per common share - basic and diluted$0.20
 $0.09
Estimated REIT taxable income per common share - basic$0.37
 $0.20
Estimated REIT taxable income per common share - diluted$0.36
 $0.20
      
Beginning cumulative non-deductible net capital loss$357
 $452
$182
 $357
Net capital loss / (utilization of net capital loss carryforward)245
 276
Ending cumulative non-deductible net capital loss 1
$602
 $728
Ending cumulative non-deductible net capital loss per ending common share$1.54
 $2.20
Increase (decrease) in net capital loss carryforward(12) 245
Ending cumulative non-deductible net capital loss$170
 $602
Ending cumulative non-deductible net capital loss per common share$0.32
 $1.54
 ________________________________
1.Capital losses in excess of capital gains are not deductible from ordinary taxable income, but may be carried forward for up to five years and applied against future net capital gains. As of March 31, 2018, $0.4 B and $0.2 B of net capital losses were available through 2018 and 2023, respectively.
The following table summarizes dividends declared during the three months ended March 31, 2018 and 2017:
  Dividends Declared per Share
Quarter Ended Series A Preferred Stock Series B Preferred Stock (Per Depositary Share) Series C Preferred Stock (Per Depositary Share) Common Stock
March 31, 2018 $
 $0.484375
 $0.43750
 $0.54
March 31, 2017 $0.50000
 $0.484375
 $
 $0.54



LIQUIDITY AND CAPITAL RESOURCES
Our primary sources of funds are borrowings under master repurchase agreements, asset sales, receipts of monthly principal and interest payments on our investment portfolio and equity offerings. We may also enter into TBA contracts to acquire or dispose of Agency RMBS and TBA dollar roll transactions to finance Agency RMBS purchases. Because the level of our borrowings can be adjusted daily, the level of cash and cash equivalents carried on our balance sheet is significantly less important than the potential liquidity available under our borrowing arrangements. Our leverage will vary periodically depending on market conditions and our assessment of risks and returns. We generally would expect our leverage to be within six to twelve times the amount of our tangible stockholders' equity. However, under certain market conditions, we may operate at leverage levels outside of this range for extended periods of time.
We currently believe that we have sufficient liquidity and capital resources available for the acquisition of additional investments, repayments on borrowings, maintenance of any margin requirements and the payment of cash dividends as required for our continued qualification as a REIT. We currently expect to distribute 100% of our taxable income so that we are not subject to U.S. Federalfederal and state corporate income taxes. Our REIT distribution requirement of at least 90% of our taxable income limits our ability to retain earnings and thereby replenish or increase capital from operations.


Debt Capital
As of March 31, 20182019 and December 31, 2017,2018, our mortgage borrowings consisted of the following (dollars in millions):
 March 31, 2018 December 31, 2017 March 31, 2019 December 31, 2018
Mortgage Borrowings Amount % Amount % Amount % Amount %
Repurchase agreements used to fund Agency RMBS $48,956
 77% $50,296
 75%
Repurchase agreements 1
 $86,324
 93% $75,717
 91%
Debt of consolidated variable interest entities, at fair value 336
 1% 357
 1% 266
 % 275
 %
Total debt 49,292
 78% 50,653
 76% 86,590
 93% 75,992
 91%
Net TBA position, at cost 13,529
 22% 15,739
 24% 6,885
 7% 7,252
 9%
Total mortgage borrowings $62,821
 100% $66,392
 100% $93,475
 100% $83,244
 100%

1.Amount excludes $361 million of repurchase agreements used to fund purchases of U.S. Treasury securities as of March 31, 2019.
Our tangible net book value "at risk" leverage was 8.2x9.4x and 8.1x9.0x as of March 31, 20182019 and December 31, 2017,2018, respectively, measured as the sum of our total mortgage borrowings and net payable / (receivable) for unsettled investment securities, divided by the sum of our total stockholders' equity adjusted to exclude goodwill and other intangible assets and investments in REIT securities.goodwill.
Repurchase Agreements
As part of our investment strategy, we borrow against our investment portfolio pursuant to master repurchase agreements. We expect that the majority of our borrowings under repurchase agreements will have maturities ranging up to one year but may have terms ranging up to five years or longer. Borrowings with maturities greater than one year typically have floating rates of interest based on LIBOR plus or minus a fixed spread.
As of March 31, 2018,2019, we had $49.0$86.3 billion of repurchase agreements outstanding used to fund acquisitions of investment securities with a weighted average costinterest rate of funds of 1.82%2.82% and a weighted average remaining days-to-maturity of 10981 days, compared $50.3$75.7 billion, 1.57%2.79% and 11649 days, respectively, as of December 31, 2017.2018.
To limit our counterparty exposure, we diversify our funding across multiple counterparties and by counterparty region. As of March 31, 2018,2019, we had master repurchase agreements with 4647 financial institutions located throughout North America, Europe and Asia, including counterparties accessed through our wholly-owned captive broker-dealer subsidiary, BES.Bethesda Securities, LLC ("BES"). BES has direct access to bilateral and triparty funding, including the General Collateral Finance Repo service offered by the Fixed Income Clearing Corporation, or "FICC," which provides us greater depth and diversity of funding at favorable terms relative to traditional bilateral repurchase agreement funding. As of March 31, 2018, $18.82019, $35.6 billion of our repurchase agreement funding was sourced through BES.
The table below includes a summary of our Agency RMBS repurchase agreement funding by number of repo counterparties and counterparty region as of March 31, 20182019. For further details regarding our borrowings under repurchase agreements as of March 31, 20182019, please refer to Notes 5 and 7 to our Consolidated Financial Statements in this Form 10-Q.


 March 31, 2018 March 31, 2019
Counter-Party Region Number of Counter-Parties Percent of Agency RMBS Repurchase Agreement Funding Number of Counter-Parties Percent of Repurchase Agreement Funding
North America:        
FICC 1 35% 1 40%
Other 26 44% 27 40%
Total North America 27 79% 28 80%
Europe 14 13% 14 14%
Asia 5 8% 5 6%
Total 46 100% 47 100%
Amounts available to be borrowed under our repurchase agreements are dependent upon lender collateral requirements and the lender's determination of the fair value of the securities pledged as collateral, which fluctuates with changes in interest rates, credit quality and liquidity conditions within the investment banking, mortgage finance and real estate industries. In addition, our counterparties apply a "haircut" to our pledged collateral, which means our collateral is valued at slightly less than market value. This haircut reflects the underlying risk of the specific collateral and protects our counterparty against a change in its value, but


conversely subjects us to counterparty credit risk and limits the amount we can borrow against our investment securities. Our master repurchase agreements do not specify the haircut; rather haircuts are determined on an individual repurchase transaction basis. Throughout the three months ended March 31, 2018,2019, haircuts on our pledged collateral remained stable and, as of March 31, 2018,2019, our weighted average haircut was approximately 4.2%3.9% of the value of our collateral, inclusive of collateral funded through BES. As of March 31, 2018,2019, our maximum amount at risk (or the amount of our repurchase liabilities in excess of the value of collateral pledged) with any counterparty related to our repurchase agreements, excluding the FICC, was less than 5%4% of our tangible stockholders' equity, andwith our top five repo counterparties, representedexcluding the FICC, representing less than 15%13% of our tangible stockholders' equity. As of March 31, 2019, approximately 7% of our tangible stockholder's equity was at risk with the FICC. We could be exposed to credit risk if the FICC or an FICC netting member defaults on its obligations. However, we believe that the risk is minimal due to the FICC's initial and daily mark-to-market margin requirements, guarantee funds and other resources that are available in the event of a default.
We may be required to pledge additional assets to our counterparties in the event the estimated fair value of the existing collateral pledged under our agreements declines and our counterparties demand additional collateral (a "margin call"), which may take the form of additional securities or cash. Specifically, margin calls would result from a decline in the fair value of our investment securities securing our repurchase agreements as well as due to prepayments on the mortgages securing such securities. Similarly, if the estimated fair value of our investment securities increases due to changes in interest rates or other factors, counterparties may release collateral back to us. Our repurchase agreements generally provide that the valuations of securities securing our repurchase agreements are to be obtained from a generally recognized source agreed to by the parties. In certain circumstances, however, our lenders have the sole discretion to determine the value of pledged collateral. In such instances, our lenders are required to act in good faith in making determinations of value. Our repurchase agreements generally provide that in the event of a margin call, we must provide additional securities or cash on the same business day that a margin call is made if the lender provides us notice prior to the margin notice deadline on such day.
As of March 31, 2018,2019, we had met all of our margin requirements and we had unrestricted cash and cash equivalents of $1.0$0.9 billion and unpledged securities of approximately $3.5$4.5 billion, including securities pledged to us and unpledged interests in our consolidated VIEs, available to meet margin calls on our repurchase agreements and other funding liabilities, derivative instruments and for other corporate purposes.
Although we believe we will have adequate sources of liquidity available to us through repurchase agreement financing to execute our business strategy, there can be no assurances that repurchase agreement financing will be available to us upon the maturity of our current repurchase agreements to allow us to renew or replace our repurchase agreement financing on favorable terms or at all. If our repurchase agreement lenders default on their obligations to resell the underlying collateral back to us at the end of the term, we could incur a loss equal to the difference between the value of the collateral and the cash we originally received.
To help manage the adverse impact of interest rate changes on the value of our investment portfolio as well as our cash flows, we utilize an interest rate risk management strategy under which we use derivative financial instruments. In particular, we attempt to mitigate the risk of the cost of our variable rate liabilities increasing at a faster rate than the earnings of our long-term fixed rate assets during a period of rising interest rates. The primary derivative instruments that we use are interest rate swaps, interest rate swaptions, U.S. Treasury securities and U.S. Treasury futures contracts. Please refer to Notes 3 and 6 to our Consolidated Financial Statements in this Form 10-Q for further details regarding our use of derivative instruments.


As with repurchase agreements, our derivative agreements typically require that we pledge/receive collateral to/from our counterparties. Our counterparties, or the central clearing agency, typically have the sole discretion to determine the value of the derivative instruments and the value of the collateral securing such instruments. In the event of a margin call, we must provide additional collateral generally on the same or next business day. We minimize counterparty credit risk associated with our derivative instruments by limiting our counterparties to registered central clearing exchanges and major financial institutions with acceptable credit ratings and by monitoring positions with individual counterparties. Excluding centrally cleared derivative instruments, as of March 31, 2018,2019, our amount at risk with any counterparty related to our interest rate swap and swaption agreements was less than 1% of our stockholders' equity. In the case of centrally cleared derivative instruments, we could be exposed to credit risk if the central clearing agencyexchange or a central clearing member defaults on its respective obligation to perform under the contract.obligations. However, we believe that the risk is minimal due to the exchanges' initial and daily mark to marketmark-to-market margin requirements, and clearinghouse guarantee funds and other resources that are available in the event of a clearing member default.
TBA Dollar Roll Transactions
TBA dollar roll transactions used to finance the purchase of Agency RMBS represent a form of off-balance sheet financing accounted for as derivative instruments. We may also use TBAs to leverage (or deleverage) our investment portfolio using long (or short) TBA contracts (see(See Notes 3 and 6 to our Consolidated Financial Statements in this Form 10-Q additional details on of our TBA transactions).
Under certain market conditions, it may be uneconomical for us to roll our TBA contracts into future months and we may need to take or make physical delivery of the underlying securities. If we were required to take physical delivery to settle a long TBA contract, we would have to fund our total purchase commitment with cash or other financing sources and our liquidity position could be negatively impacted. As of March 31, 20182019, we had a net long TBA position with a total market value of $13.6$7.0 billion


and a net carrying value of $82$70 million recognized in derivative assets/(liabilities), at fair value, on our Consolidated Balance Sheets in this Form 10-Q.
Our TBA dollar roll contracts are also subject to margin requirements governed by the Mortgage-Backed Securities Division ("MBSD") of the FICC and by our prime brokerage agreements, which may establish margin levels in excess of the MBSD. Such provisions require that we establish an initial margin based on the notional value of the TBA contract, which is subject to increase if the estimated fair value of our TBA contract or the estimated fair value of our pledged collateral declines. The MBSD has the sole discretion to determine the value of our TBA contracts and of the pledged collateral securing such contracts. In the event of a margin call, we must generally provide additional collateral on the same business day.
Settlement of our TBA obligations by taking delivery of the underlying securities as well as satisfying margin requirements could negatively impact our liquidity position. However, since we do not use TBA dollar roll transactions as our primary source of financing, we believe that we will have adequate sources of liquidity to meet such obligations.
Bethesda Securities Regulatory Capital Requirements
BES is subject to regulations of the securities business that include but are not limited to trade practices, capital structure, recordkeeping and conduct of directors, officers and employees.  As a self-clearing registered broker-dealer, BES is required to maintain minimum net regulatory capital as defined by SEC Rule 15c3-1 (the "Rule"). As of March 31, 2018,2019, the minimum net capital required was $0.3 million and BES had excess net capital of $264.1$594.2 million. Regulatory capital in excess of the minimum required by the Rule is held to meet levels required by clearing organizations, the clearing bank and other repo counterparties.
Asset Sales and TBA Eligible Securities
We maintain a portfolio of highly liquid mortgage-backed securities. We may sell our Agency securities through the TBA market by delivering them into TBA contracts, subject to "good delivery" provisions promulgated by the Securities Industry and Financial Markets Association ("SIFMA"). We may alternatively sell Agency securities that have more unique attributes on a specified basis when such securities trade at a premium over generic TBA securities or if the securities are not otherwise eligible for TBA delivery. Since the TBA market is the second most liquid market (after the U.S. Treasury market), maintaining a significant level of Agency securities eligible for TBA delivery enhances our liquidity profile and provides price support for our TBA eligible securities at or above generic TBA prices. As of March 31, 2018,2019, approximately 90%94% of our fixed rate Agency RMBS portfolio was eligible for TBA delivery.
Equity Capital
To the extent we raise additional equity capital, we may use cash proceeds from such transactions to purchase additional investment securities, to make scheduled payments of principal and interest on our funding liabilities and/or for other general corporate purposes.  There can be no assurance, however, that we will be able to raise additional equity capital at any particular time or on any particular terms. Furthermore, when the trading price of our common stock is significantly less than our estimate of our current tangible net book value per common share, among other conditions, we may repurchase shares of our common stock, subject to the provisions of a stock repurchase program in effect at such time.



OFF-BALANCE SHEET ARRANGEMENTS


As of March 31, 2018,2019, we did not maintain relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance, or special purpose or variable interest entities, established to facilitate off-balance sheet arrangements or other contractually narrow or limited purposes. Additionally, as of March 31, 2018,2019, we had not guaranteed obligations of unconsolidated entities or entered into a commitment or intent to provide funding to such entities.
FORWARD-LOOKING STATEMENTS
This document contains forward lookingforward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995.  These forward lookingforward-looking statements are based on estimates, projections, beliefs and assumptions of our management as of the date of this Quarterly Report on Form 10-Q and involve risks and uncertainties in predicting future results and conditions.  Our actual performance could differ materially from those projected or anticipated in any forward looking statements due to a variety of factors, including, without limitation, changes in interest rates, the yield curve or prepayment rates; the availability and terms of financing; changes in the market value of our assets; the effectiveness of our risk mitigation strategies; conditions in the market for Agency and other mortgage securities; or legislative or regulatory changes that affect our status as a REIT or our exemption from the Investment Company Act of 1940 or that affect the GSE’s or secondary mortgage market in which we participate.  A discussion of risks and uncertainties that could cause actual results to differ from any of our forward lookingforward-looking statements is


included in our most recent Annual Report on Form 10-K and this document under Item 1A. Risk Factors.  We caution readers not to place undue reliance on our forward lookingforward-looking statements.

Item 3. Quantitative and Qualitative Disclosures about Market Risk
Market risk is the exposure to loss resulting from changes in market factors such as interest rates, foreign currency exchange rates, commodity prices and equity prices. The primary market risks that we are exposed to are interest rate, prepayment, spread, liquidity, extension and credit risk.
Interest Rate Risk
Interest rates are highly sensitive to many factors, including fiscal and monetary policies and domestic and international economic and political considerations, as well as other factors beyond our control. We are subject to interest rate risk in connection with our assets and related financing obligations. Subject to maintaining our qualification as a REIT, we engage in a variety of interest rate management techniques to mitigate the influence of interest rate changes on our net interest income and fluctuations of our net asset value.
We seek to hedge interest rate risk with respect to both the fixed income nature of our assets and the short-term, variable rate nature of our financing. In hedging interest rates with respect to our fixed income assets, we attempt to reduce the risk of losses on the value of our investments that may result from changes in interest rates in the broader markets. In utilizing interest rate hedges with respect to our financing we attempt to improve risk-adjusted returns and, where possible, to obtain a favorable spread between the yield on our assets and the cost of our financing. The principal instruments that we use to hedge our interest rate risk are interest rate swaps, swaptions, U.S. Treasury securities and U.S. Treasury futures contracts.
obligations. Our operating results depend in large part on differences between the income earned on our assets and our cost of borrowing and hedging activities. The costs associated with our borrowings are generally based on prevailing market interest rates. During a period of rising interest rates, our borrowing costs generally will increase while the yields earned on our existing portfolio of leveraged fixed-rate assets will largely remain static. This can result in a decline in our net interest margin. The severity of any such decline would depend on our asset, liability and hedge composition at the time, as well as the magnitude and duration of the interest rate increase.
spread. Changes in the level of interest rates can also affect the rate of mortgage prepayments and the value of our assets.
Interest rates are highly sensitive to many factors, including fiscal and monetary policies and domestic and international economic and political considerations, as well as other factors beyond our control. Subject to maintaining our qualification as a REIT, we engage in a variety of interest rate management techniques to mitigate the influence of interest rate changes on our net interest income and fluctuations of our tangible net asset value. The principal instruments that we use to hedge our interest rate risk are interest rate swaps, swaptions, U.S. Treasury securities and U.S. Treasury futures contracts. Our hedging techniques are highly complex and are partly based on assumed levels of prepayments of our assets. If prepayments are slower or faster than assumed, the maturity our investments will also differ from our expectations, which could reduce the effectiveness of our hedging strategies and may cause losses on such transactions and adversely affect our cash flow.
The severity of potential declines in our tangible net book value due to fluctuations in interest rates would depend on our asset, liability and hedge composition at the time, as well as the magnitude and duration of the interest rate change. Primary measures of an instrument's price sensitivity to interest rate fluctuations are its duration and convexity. Duration measures the estimated percentage change in market value of our assets or our hedge portfolioan instrument that would be caused by a parallel change in short and long-term interest rates. The duration of our assets will vary with changes within interest rates and tends to increase when interest rates rise and decrease when interest rates fall. This "negative convexity" generally increases the interest rate exposure of our investment portfolio in excess of what is measured by duration alone.
We estimate the duration and convexity of our assets using both a third-party risk management system and market data. We review the duration estimates from the third-party model and may make adjustments based on our judgment to better reflect any unique characteristics and market trading conventions associated with certain types of securities.
The table below quantifies the estimated changes in (i) net interest income (including periodic interest costs on our interest rate swaps); (ii) the fair value of our investment portfolio (including derivatives and other securities used for hedging purposes); and (iii)in our tangible net book value per common share as of March 31, 20182019 and December 31, 20172018 should interest rates go up or down by 50 and 100 basis points, assuming instantaneous parallel shifts in the


yield curve and including the impact of both duration and convexity. All changes in income and valuevalues in the table below are measured as percentage changes from the base interest rate scenario. The base interest rate scenario assumes interest rates and prepayment projections as of March 31, 20182019 and December 31, 2017.2018.
To the extent that these estimates or other assumptions do not hold true, which is likely in a period of high volatility, actual results could differ materially from our projections. Moreover, if different models were employed in the analysis, materially different projections could result. Lastly, while the table below reflects the estimated impact of interest rate changes on a static portfolio, we actively manage our portfolio and we continuously adjust the size and composition of our asset and hedge portfolio.


Interest Rate Sensitivity 1
Interest Rate Sensitivity 1,2
Interest Rate Sensitivity 1,2
 Percentage Change in Projected March 31, 2019 December 31, 2018
Change in Interest Rate 
Net Interest Income 2
 
Portfolio Market
 Value 3,4
 
Tangible Net Asset
Value 3,5
 Estimated Change in Portfolio Market Value Estimated Change in Tangible Net Book Value Per Common Share Estimated Change in Portfolio Market Value Estimated Change in Tangible Net Book Value Per Common Share
As of March 31, 2018 
-100 Basis Points -7.1% -0.1% -1.4% -1.0% -10.6% -0.7% -7.3%
-50 Basis Points -2.8% +0.1% +1.2% -0.2% -2.6% -0.1% -1.0%
+50 Basis Points +0.7% -0.4% -3.9% -0.3% -3.6% -0.3% -3.1%
+100 Basis Points +1.6% -1.0% -9.8% -1.1% -12.4% -0.9% -9.3%
 
As of December 31, 2017 
-100 Basis Points -10.4% -1.0% -9.1%
-50 Basis Points -3.9% -0.2% -1.9%
+50 Basis Points +0.4% -0.2% -2.0%
+100 Basis Points +0.2% -0.7% -6.6%

1.Interest rate sensitivity is derivedDerived from models that are dependent on inputs and assumptions provided by third parties, assumes there are no changes in mortgage spreads and assumes a static portfolio. Actual results could differ materially from these estimates.
2.
Represents the estimated dollar change in net interest income expressed as a percent of net interest income based on asset yields and cost of funds as of such date. It includes the effect of periodic interest costs on our interest rate swaps, but excludes costs associated with our forward starting swaps and other supplemental hedges, such as swaptions and U.S. Treasury securities. Amounts also exclude costs associated with our TBA position and TBA dollar roll income/loss, which are accounted for as derivative instruments in accordance with GAAP. Base case scenario assumes interest rates and forecasted CPR of 7.6% and 8.4% as of March 31, 2018 and December 31, 2017, respectively. As of March 31, 2018, rate shock scenarios assume a forecasted CPR of 10%, 8%, 7% and 6% for the -100, -50, +50 and +100 basis points scenarios, respectively. As of December 31, 2017, rate shock scenarios assume a forecasted CPR of 13%, 10%, 7% and 7% for such scenarios, respectively. Estimated dollar change in net interest income does not include the impact of retroactive "catch-up" premium amortization adjustments due to changes in our forecasted CPR.
3.Includes the effect of derivatives and other securities used for hedging purposes.
4.Estimated dollar change in investment portfolio value expressed as a percent of the total fair value of our investment portfolio as of such date.
5.Estimated dollar change in portfolio value expressed as a percent of tangible stockholders' equity, net of the aggregate preferred stock liquidation preference, as of such date.

Prepayment Risk
Prepayment risk is the risk that our assets will be repaid at a faster rate than anticipated. Interest rates and numerous other factors affect the rate of prepayments, including housing prices, general economic conditions, loan age, size and loan-to-value ratios, and the pace of GSE buyouts of delinquent loans underlying our securities among other factors. Generally, prepayments increase during periods of falling mortgage interest rates and decrease during periods of rising mortgage interest rates. However, this may not always be the case.
If our assets prepay at a faster rate than anticipated, we may be unable to reinvest the repayments at acceptable yields. If the proceeds are reinvested at lower yields than our existing assets, our net interest income would be negatively impacted. We also amortize or accrete premiums and discounts we pay or receive at purchase relative to the stated principal of our assets into interest income over their projected lives using the effective interest method. If the actual and estimated future prepayment experience differs from our prior estimates, we are required to record an adjustment to interest income for the impact of the cumulative difference in the effective yield.
Extension Risk
Extension risk is the risk that our assets will be repaid at a slower rate than anticipated and generally increases when interest rates rise. In which case, we may have to finance our investments at potentially higher costs without the ability to reinvest principal into higher yielding securities because borrowers prepay their mortgages at a slower pace than originally expected, adversely impacting our net interest margin,spread, and thus our net interest income.
As of March 31, 2019 and December 31, 2018, our investment securities (excluding TBAs) had a weighted average projected CPR of 10.5% and 7.9%, respectively, and a weighted average yield of 3.29% and 3.31%, respectively. The table below presents estimated weighted average projected CPRs and yields for our investment securities should interest rates go up or down by 50 and 100 basis points.


Interest Rate Sensitivity 1
  March 31, 2019 December 31, 2018
Change in Interest Rate Weighted Average Projected CPR 
Weighted Average Asset Yield 2
 Weighted Average Projected CPR 
Weighted Average Asset Yield 2
-100 Basis Points 20.3% 3.01% 14.1% 3.15%
-50 Basis Points 15.0% 3.17% 10.3% 3.25%
+50 Basis Points 7.7% 3.36% 6.5% 3.33%
+100 Basis Points 6.2% 3.40% 5.7% 3.38%

1.Derived from models that are dependent on inputs and assumptions provided by third parties and assumes a static portfolio. Actual results could differ materially from these estimates. Table excludes TBA securities.
2.Asset yield based on historical cost basis and does not include the impact of retroactive "catch-up" premium amortization adjustments due to changes in projected CPR.
Spread Risk
Spread risk is the risk that the market spread between the yield on our assets and the yield on benchmark interest rates linked to our interest rate hedges, such as U.S. Treasury rates and interest rate swap rates, may vary. The inherent spread risk associated with our investment securities and the resulting fluctuations in fair value of these securities can occur independent of interest rates and may relate to other factors impacting the mortgage and fixed income markets, such as actual or anticipated monetary policy actions by the Fed,U.S. and foreign central banks, liquidity, or changes in required rates of return on different assets. Our strategies are generally


not specifically designed to protect against spread risk, thus while we use interest rate swaps and other hedges to attempt to protect against moves in interest rates, our hedges will typically not protect our net book value against spread risk and our tangible net book value could decline if spreads widen.
The table below quantifies the estimated changes in the fair value of our assets, net of hedges, and our tangible net book value per common share as of March 31, 20182019 and December 31, 20172018 should spreads widen or tighten by 10 and 25 basis points. The estimated impact of changes in spreads is in addition to our interest rate shock sensitivity included in the interest rate shock table above. The table below assumes a spread duration of 5.74.9 and 5.35.6 years as of March 31, 20182019 and December 31, 2017,2018, respectively, based on interest rates and prices as of such dates. However, our portfolio's sensitivity of mortgage spread changes will vary with changes in interest rates and in the size and composition of our portfolio. Therefore, actual results could differ materially from our estimates.
Spread Sensitivity 1
Spread Sensitivity 1,2
Spread Sensitivity 1,2
 Percentage Change in Projected March 31, 2019 December 31, 2018
Change in MBS Spread 
Portfolio
Market
Value 2,3
 
Tangible Net Asset
Value 2,4
 Estimated Change in Portfolio Market Value Estimated Change in Tangible Net Book Value Per Common Share Estimated Change in Portfolio Market Value Estimated Change in Tangible Net Book Value Per Common Share
As of March 31, 2018  
-25 Basis Points +1.4% +13.4% +1.2% +13.5% +1.4% +14.3%
-10 Basis Points +0.6% +5.4% +0.5% +5.4% +0.6% +5.7%
+10 Basis Points -0.6% -5.4% -0.5% -5.4% -0.6% -5.7%
+25 Basis Points -1.4% -13.4% -1.2% -13.5% -1.4% -14.3%
 
As of December 31, 2017 
-25 Basis Points +1.3% +12.6%
-10 Basis Points +0.5% +5.0%
+10 Basis Points -0.5% -5.0%
+25 Basis Points -1.3% -12.6%

1.Spread sensitivity is derived from models that are dependent on inputs and assumptions provided by third parties, assumes there are no changes in interest rates and assumes a static portfolio. Actual results could differ materially from these estimates.
2.Includes the effect of derivatives and other securities used for hedging purposes.
3.Estimated dollar change in investment portfolio value expressed as a percent of the total fair value of our investment portfolio as of such date.
4.Estimated dollar change in portfolio value expressed as a percent of tangible stockholders' equity, net of the aggregate preferred stock liquidation preference, as of such date.


Liquidity Risk
Our liquidity risk principally arises from financing long-term fixed rate assets with shorter-term variable rate borrowings.  As of March 31, 20182019, we had unrestricted cash and cash equivalents of $1.00.9 billion and unpledged securities of approximately $3.54.5 billion available to meet margin calls on our funding liabilities and derivative contracts and for other corporate purposes.  However, should the value of our collateral or the value of our derivative instruments suddenly decrease, margin calls relating to our funding liabilities and derivative agreements could increase, causing an adverse change in our liquidity position. Furthermore, there is no assurance that we will always be able to renew (or roll) our short-term funding liabilities. In addition, our counterparties have the option to increase our haircuts (margin requirements) on the assets we pledge against our funding liabilities, thereby reducing the amount that can be borrowed against an asset even if they agree to renew or roll our funding liabilities. Significantly higher haircuts can reduce our ability to leverage our portfolio or even force us to sell assets, especially if correlated with asset price declines or faster prepayment rates on our assets.
In addition, we often utilize TBA dollar roll transactions to invest in and finance Agency RMBS. Under certain conditions it may be uneconomical to roll our TBA dollar roll transactions beyond the next settlement date and we could have to take physical delivery of the underlying securities and settle our obligations for cash, which could negatively impact our liquidity position, result in defaults or force us to sell assets under adverse conditions.
Credit Risk
Credit risk is the risk that we may not receive full repayment of principal, interest or other remuneration related toOur credit sensitive instruments. Investments ininvestments, such as CRT and non-Agency securities, expose us to credit risk.the risk of nonpayment of principal, interest or other remuneration we are contractually entitled to. We are also exposed to credit risk in the event our derivative counterparties do not perform under the terms of our derivative agreements or in the event our repurchase agreement counterparties default on their obligations to resell the underlying collateral back to us at the end of the repo term.


We accept credit exposure related to our credit sensitive assets at levels we deem to be prudent within the context of our overall investment strategy. We attempt to manage this risk through prudent asset selection, pre-acquisition due diligence, post-acquisition performance monitoring, and the sale of assets where we identify negative credit trends. We may also manage credit risk with credit default swaps or other financial derivatives that we believe are appropriate. Additionally, we may vary the mix of our interest rate and credit sensitive assets or our duration gap to adjust our credit exposure and/or improve the return profile of our assets, such as when we believe credit performance is inversely correlated with changes in interest rates. Our credit risk related to derivative and repurchase agreement transactions is largely mitigated by limiting our counterparties to major financial institutions with acceptable credit ratings or to registered central clearinghouses and monitoring concentration levels with any one counterparty. We also monitor and adjust the amount of collateral pledged based on changes in market value.
There is no guarantee that our efforts to manage credit risk will be successful and we could suffer losses if credit performance is worse than our expectations or our counterparties default on their obligations. AsExcluding amounts cleared through a central clearing exchange, as of March 31, 2018,2019, our maximum amount at risk with any counterparty related to our repurchase agreements was less than 5%4% of our tangible stockholders' equity and our maximum amount at risk with any counterpartyless than 1% of tangible stockholders' equity related to our interest rate swap and swaption agreements, excluding centrally cleared swaps, was less than 1% of our stockholders' equity.

agreements.


Item 4. Controls and Procedures
We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our Securities Exchange Act of 1934, as amended (the "Exchange Act") reports is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure based on the definition of "disclosure controls and procedures" as promulgated under the Exchange Act and the rules and regulations thereunder. In designing and evaluating the disclosure controls and procedures, management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.
We, including our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the design and operation of our disclosure controls and procedures as of March 31, 2018.2019. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective.
Changes in Internal Control over Financial Reporting
There have been no changes in our "internal control over financial reporting" (as defined in Rule 13a-15(f) of the Exchange Act) that occurred during the last fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.




PART II. OTHER INFORMATION
Item 1. Legal Proceedings
AGNC is named as a nominal defendant in three stockholder derivative lawsuits filed against the Company and certain of our current and former directors and officers. There have been no material changes to such matters previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017. We believe the claims in these lawsuits lack merit, and we expect that the defendants will vigorously defend them. See also "Loss Contingencies" in Note 3 to our Consolidated Financial Statements included in this Form 10-Q.2018.

Item 1A. Risk Factors
There have been no material changes to the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017.2018.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
None.

Item 3. Defaults upon Senior Securities
None.

Item 4. Mine Safety Disclosures
Not applicable.

Item 5. Other Information
None.




Item 6.     Exhibits and Financial Statement Schedules
(a)    Exhibit Index
Exhibit No.Description
*3.1AGNC Investment Corp. Amended and Restated Certificate of Incorporation, as amended, incorporated herein by reference to Exhibit 3.1 of Form 10-Q for the quarter ended March 31, 2018 (File No. 001-34057), filed May 7, 2018.
*3.2AGNC Investment Corp. Third Amended and Restated Bylaws, as amended, incorporated herein by reference to Exhibit 3.2 of Form 10-Q for the quarter ended September 30, 2016 (File No. 001-34057), filed November 7, 2016.
*3.3Certificate of Designations of 7.750% Series B Cumulative Redeemable Preferred Stock, incorporated herein by reference to Exhibit 3.4 of Form 8-A (File No. 001-34057), filed May 7, 2014.
*3.4Certificate of Designations of 7.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, incorporated herein by reference to Exhibit 3.5 of Form 8-A (File No. 001-34057), filed August 18, 2017.
*3.5Certificate of Elimination of 8.000% Series A Cumulative Redeemable Preferred Stock, incorporated herein by reference to Exhibit 3.1 of Form 8-K (File No 001-34057), filed October 26, 2017.
*3.6Certificate of Designations of 6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, incorporated herein by reference to Exhibit 3.5 of Form 8-A (File No 001-34057), filed March 6, 2019.
*4.1Instruments defining the rights of holders of securities: See Article IV of our Amended and Restated Certificate of Incorporation, as amended, incorporated herein by reference to Exhibit 3.1 of Form 10-Q for the quarter ended March 31, 2018 (File No. 001-34057) filed May 7, 2018.
*4.2Instruments defining the rights of holders of securities: See Article VI of our Third Amended and Restated Bylaws, as amended, incorporated herein by reference to Exhibit 3.2 of Form 10-Q for the quarter ended September 30, 2016 (File No. 001-34057) filed November 7, 2016.
*4.3Form of Certificate for Common Stock, incorporated herein by reference to Exhibit 4.3 of Form 10-Q for the quarter ended September 30, 2016 (File No. 001-34057), filed November 7, 2016.
*4.4Specimen 7.750% Series B Cumulative Redeemable Preferred Stock Certificate, incorporated herein by reference to Exhibit 4.1 of Form 8-A (File No. 001-34057), filed May 7, 2014.
*4.5Specimen 7.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock Certificate, incorporated herein by reference to Exhibit 4.1 of Form 8-A (File No. 001-34057), filed August 18, 2017.
*4.6Specimen 6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock Certificate, incorporated herein by reference to Exhibit 4.1 of Form 8-A (File No. 001-34057), filed March 6, 2019.
*4.7Deposit Agreement relating to 7.750% Series B Cumulative Redeemable Preferred Stock, dated May 8, 2014, among American Capital Agency Corp., Computershare Inc. and Computershare Trust Company, N.A., jointly as depositary, incorporated herein by reference to Exhibit 4.2 of Form 8-K (File No. 001-34057), filed May 8, 2014.
*4.8Form of Depositary Receipt representing 1/1,000th of a share of 7.750% Series B Cumulative Redeemable Preferred Stock (included as part of Exhibit 4.7), incorporated herein by reference to Exhibit A of Exhibit 4.2 of Form 8-K (File No. 001-34057), filed May 8, 2014.
*4.9Deposit Agreement relating to 7.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, dated August 22, 2017, among AGNC Investment Corp., Computershare Inc. and Computershare Trust Company, N.A., jointly as depositary, incorporated herein by reference to Exhibit 4.2 of Form 8-K (File No. 001-34057) filed August 22, 2017.
*4.10Form of Depositary Receipt representing 1/1,000th of a share of 7.00% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock (included as part of Exhibit 4.9), incorporated herein by reference to Exhibit A of Exhibit 4.2 of Form 8-K (File No. 001-34057) filed August 22, 2017.


*4.11Deposit Agreement relating to 6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, dated March 6, 2019, among AGNC Investment Corp., Computershare Inc. and Computershare Trust Company, N.A., jointly as depositary, incorporated herein by reference to Exhibit 4.2 of Form 8-K (File No. 001-34057) filed March 6, 2019.
*4.12Form of Depositary Receipt representing 1/1,000th of a share of 6.875% Series D Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock (included as part of Exhibit 4.11), incorporated herein by reference to Exhibit A of Exhibit 4.2 of Form 8-K (File No. 001-34057) filed March 6, 2019.
† 10Form of AGNC Investment Corp. 2016 Equity and Incentive Compensation Plan Restricted Stock Unit Agreement for Non-Employee Directors, filed herewith.
31.1Certification of CEO Pursuant to Section 302(a) of the Sarbanes-Oxley Act of 2002.
31.2Certification of CFO Pursuant to Section 302(a) of the Sarbanes-Oxley Act of 2002.
32Certification of CEO and CFO Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
Exhibit No.101.INS**Description
inline XBRL document


101.INS**XBRL Instance Document
101.SCH**XBRL Taxonomy Extension Schema Document
101.CAL**XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB**XBRL Taxonomy Extension Labels Linkbase Document
101.PRE**XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF**XBRL Taxonomy Extension Definition Linkbase Document

*    Previously filed
**This exhibit is being furnished rather than filed, and shall not be deemed incorporated by reference into any filing, in accordance with Item 601 of Regulation S-K
Management contract or compensatory plan or arrangement


(b)Exhibits
    See the exhibits filed herewith.
 
(c)Additional financial statement schedules
 None.




SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 
   
AGNC INVESTMENT CORP.
     
   By:
/s/    GARY D. KAIN
    Gary D. Kain

Chief Executive Officer and

Chief Investment Officer (Principal Executive Officer)
Date:May 7, 20183, 2019   
     
   By:
/s/    BERNICEE. BELL
    
Bernice E. Bell

Senior Vice President and
Chief Financial Officer
( (Principal Financial Officer and Principal FinancialAccounting Officer)
Date:May 7, 20183, 2019   







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