Bbif Treasury Fund NCSR Certified annual shareholder report (management investment company)

UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT
INVESTMENT COMPANIES

Investment Company Act file number 811-21199 and 811-21298

Name of Fund: WCMA Treasury Fund and Master Treasury LLC

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, WCMA Treasury
Fund and Master Treasury LLC, 55 East 52^ndStreet, New York, NY 10055.

Registrant’s telephone number, including area code: (800) 221-7210

Date of fiscal year end: 03/31/2010

Date of reporting period: 03/31/2010

Item 1 – Report to Stockholders

Annual Report

March 31, 2010

WCMA Government Securities Fund

WCMA Treasury Fund


Table of Contents
	Page
Dear Shareholder	3
Annual Report:
Fund Information	4
Disclosure of Expenses	4
Fund Financial Statements:
Statements of Assets and Liabilities	5
Statements of Operations	6
Statements of Changes in Net Assets	7
Fund Financial Highlights	8
Fund Notes to Financial Statements	12
Fund Report of Independent Registered Public Accounting Firm	16
Fund Important Tax Information	16
Portfolio Information	17
Master LLCs Financial Statements:
Schedules of Investments	18
Statements of Assets and Liabilities	20
Statements of Operations	21
Statements of Changes in Net Assets	21
Master LLCs Financial Highlights	22
Master LLCs Notes to Financial Statements	23
Master LLCs Report of Independent Registered Public Accounting Firm	25
Officers and Directors	26
Additional Information	29

2 ANNUAL REPORT

MARCH 31, 2010

Dear Shareholder

The past year has seen a remarkable turnaround from the conditions that plagued the global economy and financial markets in 2008 through early

2009. In our opinion, the “Great Recession” likely ended at some point last summer, thanks primarily to massive fiscal and monetary stimulus. From that

point, the global economy has moved into recovery mode and, we believe, is getting ready to start transitioning into an expansion.

Global equity markets bottomed in early 2009 and since that time have soared dramatically higher as investors were lured back into the markets by

depressed valuations, desire for higher yields and increasing confidence that all-out financial disaster had been averted. There have been several correc-

tions along the way and volatility levels have remained elevated — reflections of mixed economic data, lingering deflation issues (especially in Europe)

and concerns over the future direction of interest rates. On balance, however, strong corporate earnings and a positive macro backdrop have helped keep

the equity bull market intact. From a geographic perspective, US equities have generally outpaced their international counterparts in recent months, as

the domestic economic recovery has been more pronounced.

Within fixed income markets, improving economic conditions, concerns over the US deficit and a lack of demand at recent Treasury auctions have

recently conspired to push Treasury yields higher (and prices correspondingly lower). In this environment, Treasuries have dramatically underperformed

other areas of the bond market, particularly the high yield sector, which has been benefiting from increased investor demand. Meanwhile, municipal

bonds outperformed taxable sectors over the twelve-month period thanks to continued high demand levels, but have struggled in recent months against

a weak fundamental backdrop marked by ongoing state and local budget problems. As in the taxable arena, high yield municipals have been outper-

forming the rest of the market.

Regarding cash investments, yields on money market securities remain near all-time lows (producing returns only marginally above zero percent), with

the Federal Open Market Committee reiterating that economic circumstances are likely to necessitate an accommodative interest rate stance for an

“extended period.”


Against this backdrop, the major market averages posted the following returns:
Total Returns as of March 31, 2010	6-month	12-month
US equities (S&P 500 Index)	11.75%	49.77%
Small cap US equities (Russell 2000 Index)	13.07	62.76
International equities (MSCI Europe, Australasia, Far East Index)	3.06	54.44
3-month Treasury bill (BofA Merrill Lynch 3-Month Treasury Bill Index)	0.05	0.17
US Treasury securities (BofA Merrill Lynch 10-Year US Treasury Index)	(2.62)	(6.30)
Taxable fixed income (Barclays Capital US Aggregate Bond Index)	1.99	7.69
Tax-exempt fixed income (Barclays Capital Municipal Bond Index)	0.28	9.69
High yield bonds (Barclays Capital US Corporate High Yield 2% Issuer Capped Index)	10.97	55.64

Past performance is no guarantee of future results. Index performance shown for illustrative purposes only. You cannot invest directly in an index.

Global financial markets continue to show signs of improvement, but questions about the strength and sustainability of the recovery abound. Through

periods of uncertainty, as ever, BlackRock’s full resources are dedicated to the management of our clients’ assets. For additional market perspective

and investment insight, visit www.blackrock.com/shareholdermagazine, where you’ll find the most recent issue of our award-winning Shareholder®

magazine, as well as its quarterly companion newsletter, Shareholder Perspectives. As always, we thank you for entrusting BlackRock with your invest-

ments, and we look forward to your continued partnership in the months and years ahead.

THIS PAGE NOT PART OF YOUR FUND REPORT


Fund Information
Current Seven-Day Yields
	7-Day SEC Yields		7-Day Yields
	WCMA Government	WCMA	WCMA Government	WCMA
As of March 31, 2010	Securities Fund	Treasury Fund	Securities Fund	Treasury Fund
Class 1	0.00%	0.00%	0.00%	0.00%
Class 2	0.00%	0.00%	0.00%	0.00%
Class 4	0.00%	0.00%	0.00%	0.00%
Class 4	0.00%	0.00%	0.00%	0.00%
The 7-Day SEC Yields may differ from the 7-Day Yields shown above due to the fact that the 7-Day SEC Yields exclude distributed capital gains.
Past performance is not indicative of future results

Disclosure of Expenses

Shareholders of each Fund may incur the following charges: (a) expenses
related to transactions, including sales charges, redemption fees and
exchange fees; and (b) operating expenses including administration fees,
distribution fees including 12b-1 fees and other Fund expenses. The
expense example below (which is based on a hypothetical investment
of $1,000 invested on October 1, 2009 and held through March 31,
2010) is intended to assist shareholders both in calculating expenses
based on an investment in each Fund and in comparing these expenses
with similar costs of investing in other mutual funds.

The table below provides information about actual account values and
actual expenses. In order to estimate the expenses a shareholder paid
during the period covered by this report, shareholders can divide their
account value by $1,000 and then multiply the result by the number
corresponding to their Fund and share class under the heading entitled
“Expenses Paid During the Period.”

The table also provides information about hypothetical account values
and hypothetical expenses based on each Fund’s actual expense ratio
and an assumed rate of return of 5% per year before expenses. In order
to assist shareholders in comparing the ongoing expenses of investing
in these Funds and other funds, compare the 5% hypothetical example
with the 5% hypothetical examples that appear in other funds’ share-
holder reports.

The expenses shown in the table are intended to highlight shareholders’
ongoing costs only and do not reflect any transactional expenses, such
as sales charges, redemption fees or exchange fees. Therefore, the hypo-
thetical example is useful in comparing ongoing expenses only, and will
not help shareholders determine the relative total expenses of owning dif-
ferent funds. If these transactional expenses were included, shareholder
expenses would have been higher.


		Actual			Hypothetical²
	Beginning	Ending		Beginning	Ending
	Account Value	Account Value		Account Value	Account Value
	October 1,	March 31,	Expenses Paid	October 1,	March 31,	Expenses Paid
	2009	2010	During the Period¹	2009	2010	During the Period¹
WCMA Government Securities Fund
Class 1	$1,000	$1,000.20	$0.80	$1,000	$1,024.10	$0.81
Class 2	$1,000	$1,000.20	$0.80	$1,000	$1,024.10	$0.81
Class 3	$1,000	$1,000.20	$0.80	$1,000	$1,024.10	$0.81
Class 4	$1,000	$1,000.20	$0.80	$1,000	$1,024.10	$0.81
WCMA Treasury Fund
Class 1	$1,000	$1,000.20	$0.65	$1,000	$1,024.25	$0.66
Class 2	$1,000	$1,000.20	$0.65	$1,000	$1,024.25	$0.66
Class 3	$1,000	$1,000.20	$0.65	$1,000	$1,024.25	$0.66
Class 4	$1,000	$1,000.20	$0.65	$1,000	$1,024.25	$0.66

¹For each class of WCMA Government Securities Fund, expenses are equal to the annualized expense ratio for the class (0.16% for Class 1, 0.16% for Class 2, 0.16% for
Class 3 and 0.16% for Class 4), and for each class of WCMA Treasury Fund, expenses are equal to the annualized expense ratio for the class (0.13% for Class 1, 0.13% for
Class 2, 0.13% for Class 3 and 0.13% for Class 4), multiplied by the average account value over the period, multiplied by 182/365 (to reflect the one-half year period
shown). Because the Funds are feeder funds, the expense table example reflects the expenses of both the feeder fund and the Master LLC in which it invests.
²Hypothetical 5% annual return before expenses is calculated by pro rating the number of days in the most recent fiscal half year divided by 365.

4 ANNUAL REPORT

MARCH 31, 2010


Statements of Assets and Liabilities
	WCMA	WCMA
	Government	Treasury
March 31, 2010	Securities Fund	Fund
Assets
Investments at value — Master Government Securities LLC and Master Treasury LLC
(individually "Government LLC" and "Treasury LLC", or collectively the "Master LLCs"), respectively¹	$ 359,832,842	$ 1,178,882,363
Capital shares sold receivable.	1,438,174	339,574
Prepaid expenses	25,338	47,067
Other assets	1,074	6,183
Total assets	361,297,428	1,179,275,187
Liabilities
Contributions payable to the Master LLCs	1,438,174	339,574
Administration fee payable	47,615	23,034
Service and distribution fees payable	14,284	—
Officer's and Directors’ fees payable	41	147
Other accrued expenses payable	55,054	27,857
Total liabilities	1,555,168	390,612
Net Assets	$ 359,742,260	$ 1,178,884,575
Net Assets Consist of
Paid-in capital^2,3	$ 359,732,315	$ 1,178,846,476
Accumulated net realized gains allocated from the Master LLCs	9,945	38,099
Net Assets	$ 359,742,260	$ 1,178,884,575
Net Asset Value
Class 1
Net assets	$ 13,269,701	$ 25,131,679
Shares outstanding	13,269,540	25,131,563
Net asset value	$ 1.00	$ 1.00
Class 2
Net assets	$ 60,952,936	$ 160,005,418
Shares outstanding	60,950,447	159,998,354
Net asset value	$ 1.00	$ 1.00
Class 3
Net assets	$ 135,353,434	$ 445,844,392
Shares outstanding	135,350,123	445,830,195
Net asset value	$ 1.00	$ 1.00
Class 4
Net assets	$ 150,166,189	$ 547,903,086
Shares outstanding	150,162,207	547,886,365
Net asset value	$ 1.00	$ 1.00
¹Investments at cost	$ 359,832,842	$ 1,178,882,363
²Shares authorized	unlimited	unlimited
³Par value per share	$ 0.10	$ 0.10

See Notes to Financial Statements.

ANNUAL REPORT

MARCH 31, 2010


Statements of Operations
	WCMA	WCMA
	Government	Treasury
Year Ended March 31, 2010	Securities Fund	Fund
Investment Income
Income	$ 348	$ 77
Net investment income allocated from the Master LLCs:
Interest	882,267	2,704,726
Expenses	(299,359)	(1,760,819)
Total income	583,256	943,984
Expenses
Service and distribution — Class 1	111,659	280,005
Service and distribution — Class 2	432,471	1,294,332
Service and distribution — Class 3	544,713	2,029,479
Service and distribution — Class 4	716,138	2,064,047
Administration	1,037,654	3,312,848
Registration	664,759	557,231
Professional	18,652	22,642
Federal insurance	15,674	38,687
Transfer agent — Class 1	5,509	10,937
Transfer agent — Class 2	6,592	17,836
Transfer agent — Class 3	4,358	14,364
Transfer agent — Class 4	7,545	10,984
Printing	17,497	47,892
Officer and Directors	190	599
Miscellaneous	13,329	17,092
Total expenses	3,596,740	9,718,975
Less fees waived by administrator	(987,195)	(3,187,199)
Less expenses reimbursed by administrator	(213,823)	—
Less service and distribution fees waived — Class 1	(111,616)	(280,005)
Less service and distribution fees waived — Class 2	(430,208)	(1,294,332)
Less service and distribution fees waived — Class 3	(539,136)	(2,029,479)
Less service and distribution fees waived — Class 4	(709,737)	(2,064,047)
Transfer agent fees reimbursed — Class 1	(5,163)	(9,571)
Transfer agent fees reimbursed — Class 2	(6,120)	(17,704)
Transfer agent fees reimbursed — Class 3	(4,030)	(13,992)
Transfer agent fees reimbursed — Class 4	(6,897)	(10,620)
Total expenses after fees waived and reimbursed	582,815	812,026
Net investment income	441	131,958
Realized Gain Allocated from the Master LLCs
Net realized gain from investments	19,773	91,374
Net Increase in Net Assets Resulting from Operations	$ 20,214	$ 223,332

See Notes to Financial Statements.

6 ANNUAL REPORT

MARCH 31, 2010


Statements of Changes in Net Assets
	WCMA			WCMA
	Government			Treasury
	Securities Fund			Fund
	Year Ended March 31,			Year Ended March 31,
Increase (Decrease) in Net Assets:	2010		2009	2010	2009
Operations
Net investment income	$ 441	$ 3,324,918		$ 131,958	$ 6,329,208
Net realized gain	19,773		28,008	91,374	100,148
Net increase in net assets resulting from operations	20,214		3,352,926	223,332	6,429,356
Dividends and Distributions to Shareholders From
Net investment income:
Class 1	(1,130)		(23,187)	(3,762)	(27,004)
Class 2	(9,870)		(419,279)	(46,510)	(626,650)
Class 3	(21,965)		(1,149,057)	(130,926)	(2,631,317)
Class 4	(28,659)		(1,733,395)	(138,420)	(3,044,237)
Net realized gain:
Class 1	(389)		—	(2,038)	—
Class 2	(973)		—	(4,232)	—
Class 3	(2,717)		—	(13,642)	—
Class 4	(5,749)		—	(4,064)	—
Decrease in net assets resulting from dividends and distributions to shareholders	(71,452)		(3,324,918)	(343,594)	(6,329,208)
Capital Share Transactions
Net increase (decrease) in net assets derived from capital share transactions	(142,258,446)		(7,868,135)	(303,439,118)	431,702,587
Net Assets
Total increase (decrease) in net assets	(142,309,684)		(7,840,127)	(303,559,380)	431,802,735
Beginning of year	502,051,944		509,892,071	1,482,443,955	1,050,641,220
End of year	$ 359,742,260	$ 502,051,944		$1,178,884,575	$1,482,443,955
Undistributed net investment income	—	$ 61,183		—	$ 187,660

See Notes to Financial Statements.

ANNUAL REPORT

MARCH 31, 2010


Financial Highlights							WCMA Government Securities Fund
			Class 1					Class 2
		Year Ended March 31,					Year Ended March 31,
	2010	2009	2008	2007	2006	2010	2009	2008	2007	2006
Per Share Operating Performance
Net asset value, beginning of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Net investment income	0.0000	0.0019	0.0274	0.0351	0.0199	0.0000	0.0051	0.0336	0.0407	0.0259
Net realized and unrealized gain	0.0001	0.0000	0.0013	0.0003	0.0001	0.0000	0.0001	0.0011	0.0004	0.0001
Net increase from investment operations	0.0001	0.0019	0.0287	0.0354	0.0200	0.0000	0.0052	0.0347	0.0411	0.0260
Dividends and distributions from:
Net investment income	(0.0002)	(0.0019)	(0.0274)	(0.0351)	(0.0199)	(0.0002)	(0.0051)	(0.0336)	(0.0407)	(0.0259)
Net realized gain	(0.0000)	—	—	(0.0000)	(0.0000)	(0.0000)	—	—	(0.0000)	(0.0000)
Total dividends and distributions	(0.0002)	(0.0019)	(0.0274)	(0.0351)	(0.0199)	(0.0002)	(0.0051)	(0.0336)	(0.0407)	(0.0259)
Net asset value, end of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Investment Return¹
Total investment return	0.02%	0.19%	2.77%	3.55%	2.01%	0.02%	0.51%	3.41%	4.13%	2.63%
Ratios to Average Net Assets²
Total expenses	1.50%	1.61%	1.62%	1.59%	1.59%	1.18%	1.27%	1.26%	1.28%	1.27%
Total expenses after fees
waived and reimbursed	0.22%	1.06%	1.62%	1.59%	1.59%	0.21%	0.76%	1.00%	1.03%	0.99%
Net investment income	0.00%³	0.19%	2.68%	3.51%	1.99%	0.00%³	0.51%	3.32%	4.07%	2.58%
Supplemental Data
Net assets, end of year (000)	$ 13,270	$ 9,160	$ 10,544	$ 11,122	$ 18,837	$ 60,953	$ 70,723	$ 88,881	$ 82,655	$115,872

¹Where applicable, total investment returns include the reinvestment of dividends and distributions.
²Includes the Fund’s share of the Master LLC’s allocated expenses and/or net investment income.
³Amount is less than 0.01%.

See Notes to Financial Statements.

8 ANNUAL REPORT

MARCH 31, 2010


Financial Highlights (concluded)							WCMA Government Securities Fund
			Class 3					Class 4
		Year Ended March 31,					Year Ended March 31,
	2010	2009	2008	2007	2006	2010	2009	2008	2007	2006
Per Share Operating Performance
Net asset value, beginning of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Net investment income	0.0000	0.0070	0.0368	0.0439	0.0291	0.0000	0.0070	0.0368	0.0439	0.0291
Net realized and unrealized gain	0.0000	0.0001	0.0010	0.0004	0.0001	0.0000	0.0001	0.0003	0.0003	0.0002
Net increase from investment operations	0.0000	0.0071	0.0378	0.0443	0.0292	0.0000	0.0071	0.0371	0.0442	0.0293
Dividends and distributions from:
Net investment income	(0.0002)	(0.0070)	(0.0368)	(0.0439)	(0.0291)	(0.0002)	(0.0070)	(0.0368)	(0.0439)	(0.0291)
Net realized gain	(0.0000)	—	—	(0.0000)	(0.0000)	(0.0000)	—	—	(0.0000)	(0.0000)
Total dividends and distributions	(0.0002)	(0.0070)	(0.0368)	(0.0439)	(0.0291)	(0.0002)	(0.0070)	(0.0368)	(0.0439)	(0.0291)
Net asset value, end of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Investment Return¹
Total investment return	0.02%	0.70%	3.74%	4.47%	2.96%	0.02%	0.70%	3.74%	4.47%	2.96%
Ratios to Average Net Assets²
Total expenses	0.88%	0.97%	0.96%	0.98%	0.97%	0.87%	0.96%	0.95%	0.98%	0.98%
Total expenses after fees
waived and reimbursed	0.21%	0.55%	0.68%	0.71%	0.67%	0.22%	0.56%	0.68%	0.71%	0.67%
Net investment income	0.00%³	0.68%	3.67%	4.41%	2.88%	0.00%³	0.72%	3.59%	4.41%	3.10%
Supplemental Data
Net assets, end of year (000)	$135,353	$159,693	$154,833	$158,327	$158,500	$150,166	$262,476	$255,634	$208,801	$207,778

See Notes to Financial Statements.

ANNUAL REPORT

MARCH 31, 2010


Financial Highlights									WCMA Treasury Fund
			Class 1					Class 2
		Year Ended March 31,					Year Ended March 31,
	2010	2009	2008	2007	2006	2010	2009	2008	2007	2006
Per Share Operating Performance
Net asset value, beginning of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Net investment income	0.0000	0.0015	0.0251	0.0331	0.0184	0.0001	0.0041	0.0307	0.0385	0.0241
Net realized and unrealized gain	0.0001	0.0001	0.0006	0.0002	0.0002	0.0001	0.0001	0.0003	0.0003	0.0001
Net increase from investment operations	0.0001	0.0016	0.0257	0.0333	0.0186	0.0002	0.0042	0.0310	0.0388	0.0242
Dividends and distributions from:
Net investment income	(0.0002)	(0.0015)	(0.0251)	(0.0331)	(0.0184)	(0.0002)	(0.0041)	(0.0307)	(0.0385)	(0.0241)
Net realized gain	(0.0000)	—	—	(0.0000)	(0.0001)	(0.0000)	—	—	(0.0000)	(0.0001)
Total dividends and distributions	(0.0002)	(0.0015)	(0.0251)	(0.0331)	(0.0185)	(0.0002)	(0.0041)	(0.0307)	(0.0385)	(0.0242)
Net asset value, end of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Investment Return¹
Total investment return	0.02%	0.15%	2.53%	3.35%	1.87%	0.03%	0.41%	3.10%	3.91%	2.45%
Ratios to Average Net Assets²
Total expenses	1.45%	1.50%	1.53%	1.57%	1.55%	1.12%	1.17%	1.21%	1.26%	1.24%
Total expenses after fees
waived and reimbursed	0.20%	0.91%	1.53%	1.57%	1.55%	0.20%	0.70%	0.98%	1.04%	0.98%
Net investment income	0.00%³	0.12%	2.29%	3.32%	3.82%	0.01%	0.33%	2.98%	3.85%	2.42%
Supplemental Data
Net assets, end of year (000)	$ 25,132	$ 23,784	$ 33,561	$ 14,251	$ 17,407	$160,005	$225,289	$141,916	$ 98,905	$118,142

See Notes to Financial Statements.

10 ANNUAL REPORT

MARCH 31, 2010


Financial Highlights (concluded)									WCMA Treasury Fund
			Class 3					Class 4
		Year Ended March 31,					Year Ended March 31,
	2010	2009	2008	2007	2006	2010	2009	2008	2007	2006
Per Share Operating Performance
Net asset value, beginning of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Net investment income	0.0001	0.0064	0.0343	0.0421	0.0277	0.0001	0.0064	0.0343	0.0421	0.0277
Net realized and unrealized gain	0.0001	0.0001	0.0002	0.0003	0.0001	0.0001	0.0001	0.0001	0.0002	0.0001
Net increase from investment operations	0.0002	0.0065	0.0345	0.0424	0.0278	0.0002	0.0065	0.0344	0.0423	0.0278
Dividends and distributions from:
Net investment income	(0.0002)	(0.0064)	(0.0343)	(0.0421)	(0.0277)	(0.0002)	(0.0064)	(0.0343)	(0.0421)	(0.0277)
Net realized gain	(0.0000)	—	—	(0.0000)	(0.0001)	(0.0000)	—	—	(0.0000)	(0.0001)
Total dividends and distributions	(0.0002)	(0.0064)	(0.0343)	(0.0421)	(0.0278)	(0.0002)	(0.0064)	(0.0343)	(0.0421)	(0.0278)
Net asset value, end of year	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Investment Return¹
Total investment return	0.03%	0.64%	3.48%	4.28%	2.81%	0.03%	0.64%	3.48%	4.28%	2.81%
Ratios to Average Net Assets²
Total expenses	0.81%	0.87%	0.89%	0.96%	0.94%	0.81%	0.87%	0.89%	0.95%	0.93%
Total expenses after fees
waived and reimbursed	0.20%	0.50%	0.62%	0.68%	0.63%	0.19%	0.50%	0.61%	0.68%	0.63%
Net investment income	0.01%	0.50%	3.22%	4.23%	2.80%	0.01%	0.53%	3.06%	4.24%	2.86%
Supplemental Data
Net assets, end of year (000)	$445,844	$640,439	$375,727	$171,739	$167,197	$547,903	$592,932	$499,438	$126,693	$ 88,886

See Notes to Financial Statements.

ANNUAL REPORT

MARCH 31, 2010

Notes to Financial Statements WCMA Government Securities Fund and WCMA Treasury Fund

1. Organization and Significant Accounting Policies:

WCMA Government Securities Fund and WCMA Treasury Fund
(collectively the “Funds” or individually as the “Fund”) are registered
under the Investment Company Act of 1940, as amended (the “1940
Act”), as no load, diversified, open-end management investment compa
nies. Each Fund is organized as a Massachusetts business trust. WCMA
Government Securities Fund and WCMA Treasury Fund seek to achieve
their investment objectives by investing all of their assets in Master
Government Securities LLC and Master Treasury LLC, respectively,
(collectively the “Master LLCs”), which have the same investment
objective and strategies as the Funds. Each Master LLC is organized
as a Delaware limited liability company. The value of each Fund’s invest
ment in the applicable Master LLC reflects each Fund’s proportionate
interest in the net assets of the respective Master LLC. The percentage
of the Master LLCs owned by the Funds at March 31, 2010 was 52.9%
for WCMA Government Securities Fund and 41.3% for WCMA Treasury
Fund. The performance of each Fund is directly affected by the perform
ance of the applicable Master LLC. The financial statements of the
Master LLCs, including the Schedules of Investments, are included else
where in this report and should be read in conjunction with the Funds’
financial statements. The Boards of Trustees of the Funds and the
Boards of Directors of the Master LLCs are referred to throughout this
report as the “Board of Directors” or the “Board.” The Funds’ financial
statements are prepared in conformity with accounting principles gener
ally accepted in the United States of America (“US GAAP”), which may
require the use of management accruals and estimates. Actual results
may differ from these estimates. Each Fund’s shares are divided into
four classes, designated Class 1, Class 2, Class 3 and Class 4. Each
Class 1, Class 2, Class 3 and Class 4 share of a Fund represents an
interest in the same assets of the Fund and has identical voting, divi-
dend, liquidation and other rights and the same terms and conditions,
except that each class bears certain expenses related to service and
distribution of such shares and the additional incremental transfer
agency costs resulting from the conversion of shares and has exclusive
voting with respect to matters relating to such shareholder servicing and
distribution expenditures.

The following is a summary of significant accounting policies followed
the Funds:

Valuation: Each Fund records its investment in the respective Master
LLC at fair value. Valuation of securities held by the Master LLCs is
discussed in Note 1 of the Master LLCs’ Notes to Financial Statements,
which are included elsewhere in this report. Each Fund seeks to main-
tain its net asset value per share at $1.00, although there is no assur-
ance that they will be able to do so on a continuing basis.

Fair Value Measurements: Various inputs are used in determining the
fair value of investments, which are as follows:

•Level 1 — price quotations in active markets/exchanges for identical
assets and liabilities

•Level 2 — other observable inputs (including, but not limited to:
quoted prices for similar assets or liabilities in markets that are
active, quoted prices for identical or similar assets in markets that
are not active, inputs other than quoted prices that are observable
for the assets or liabilities (such as interest rates, yield curves,
volatilities, prepayment speeds, loss severities, credit risks and
default rates) or other market-corroborated inputs)

•Level 3 — unobservable inputs based on the best information
available in the circumstances, to the extent observable inputs
are not available (including the Funds’ own assumptions used in
determining the fair value of investments)

The inputs or methodologies used for valuing securities are not
necessarily an indication of the risk associated with investing in
those securities.

As of March 31, 2010, the Funds’ investments in the Master LLCs were
classified as Level 2. The Funds believe more relevant disclosure regard-
ing fair value measurements relates to the Master LLCs, which is dis-
closed in Note 1 of the Master LLCs’ Notes to Financial Statements,
which are included elsewhere in this report.

Investment Transactions and Investment Income: For financial reporting
purposes, investment transactions in the Master LLCs are accounted for
on a trade date basis. Each Fund records daily its proportionate share
of the applicable Master LLC’s income, expenses and realized gains and
losses. In addition, each Fund accrues its own income and expenses.
Income and realized gains and losses on investments are allocated daily
to each class based on its relative net assets.

Dividends and Distributions: Dividends from net investment income
are declared and reinvested daily. Distributions of realized gains, if any,
are recorded on the ex-dividend dates. The amount and timing of divi-
dends and distributions are determined in accordance with federal
income tax regulations, which may differ from US GAAP.

Income Taxes: It is each Fund’s policy to comply with the requirements
of the Internal Revenue Code of 1986, as amended, applicable to regu-
lated investment companies and to distribute substantially all of its tax-
able income to its shareholders. Therefore, no federal income tax
provision is required.

12 ANNUAL REPORT

MARCH 31, 2010

Notes to Financial Statements (continued) WCMA Government Securities Fund and WCMA Treasury Fund

The Funds file US federal and various state and local tax returns. No
income tax returns are currently under examination. The statute of limita-
tions on the Funds’ US federal tax returns remains open for the four
years ended March 31, 2010. The statutes of limitations on the Funds’
state and local tax returns may remain open for an additional year
depending upon the jurisdiction. There are no uncertain tax positions
that require recognition of a tax liability.

Recent Accounting Standard: In January 2010, the Financial Accounting
Standards Board issued amended guidance to improve disclosure about
fair value measurements which will require additional disclosures about
transfers into and out of Levels 1 and 2 and separate disclosures about
purchases, sales, issuances and settlements in the reconciliation for fair
value measurements using significant unobservable inputs (Level 3). It
also clarifies existing disclosure requirements relating to the levels of
disaggregation for fair value measurement and inputs and valuation
techniques used to measure fair value. The amended guidance is effec-
tive for financial statements for fiscal years beginning after December
15, 2009, and interim periods within those fiscal years, except for dis-
closures about purchases, sales, issuances and settlements in the roll-
forward of activity in Level 3 fair value measurements, which are effective
for fiscal years beginning after December 15, 2010, and for interim peri-
ods within those fiscal years. The impact of this guidance on the Funds’
financial statements and disclosures is currently being assessed.

Other: Expenses directly related to each Fund or its classes are charged
to that Fund or class. Other operating expenses shared by several funds
are pro rated among those funds on the basis of relative net assets or
other appropriate methods. Other expenses of the Funds are allocated
daily to each class based on its relative net assets or other appropriate
methods. The Funds have an arrangement with the custodian whereby
fees may be reduced by credits earned on uninvested cash balances,
which if applicable are shown as fees paid indirectly in the Statements
of Operations. The custodian imposes fees on overdrawn cash balances,
which can be offset by accumulated credits earned or may result in
additional custody charges.

2. Administration Agreement and Other Transactions with
Affiliates:

The PNC Financial Services Group, Inc. (“PNC”), Bank of America
Corporation (“BAC”) and Barclays Bank PLC (“Barclays”) are the largest
stockholders of BlackRock, Inc. (“BlackRock”). Due to the ownership
structure, PNC is an affiliate of the Funds for 1940 Act purposes, but
BAC and Barclays are not.

Each Fund has entered into an Administration Agreement with BlackRock
Advisors, LLC (the “Administrator”), an indirect, wholly owned subsidiary
of BlackRock, to provide administration services (other than investment

advice and related portfolio activities). For such services, each Fund
pays the Administrator a monthly fee at an annual rate of 0.25% of
each Fund’s average daily net assets. The Funds do not pay an advisory
fee or investment management fee.

Each Fund has entered into a Distribution Agreement and a Distribution
and Shareholder Servicing Plan (the “Distribution Plan”) with BlackRock
Investments, LLC (“BRIL”), an affiliate of BlackRock.

Pursuant to the Distribution Plan and in accordance with Rule 12b-1
under the 1940 Act, the Funds pay BRIL ongoing service and distribution
fees. The fees are accrued daily and paid monthly at annual rates based
upon the average daily net assets of the shares of the Funds as follows:


	Service	Distribution
	Fee	Fee
Class 1	0.25%	0.750%
Class 2	0.25%	0.425%
Class 3	0.25%	0.125%
Class 4	0.25%	0.125%

The ongoing service and/or distribution fee compensates BRIL for pro-
viding shareholder servicing and/or distribution related services to
shareholders. The Funds have entered into a contractual arrangement
with the Administrator and BRIL to waive and/or reimburse a portion of
each Fund’s direct fees and expenses to ensure that the net expenses
for WCMA Government Securities Fund’s Class 2 Shares is 0.32% higher
than those of CMA Government Securities Fund and the net expenses
for WCMA Treasury Fund’s Class 2 Shares is 0.35% higher than those of
CMA Treasury Fund, and the net expenses of the respective Class 3 and
Class 4 Shares are equal to those of CMA Government Securities Fund
and CMA Treasury Fund. The fee/expense waiver or reimbursement
includes service and distribution fees. This arrangement has a one-year
term and is renewable. These amounts are included in service and distri-
bution fees waived in the Statements of Operations.

In addition to the contractual arrangement described above, the
Administrator and BRIL voluntarily agreed to waive a portion of their
respective administration and service and distribution fees and/or
reimburse operating expenses to enable each class of the Funds to
maintain minimum daily levels of net investment income. These amounts
are included in fees waived by administrator, other expenses reimbursed,
service and distribution fees waived and transfer agent fees reimbursed
in the Statements of Operations. The Administrator and BRIL may dis-
continue this waiver or reimbursement at any time.

Certain officers and/or directors of the Funds are officers and/or
directors of BlackRock or its affiliates. The Funds reimburse the
Administrator for compensation paid to the Funds’ Chief
Compliance Officer.

ANNUAL REPORT

MARCH 31, 2010

Notes to Financial Statements (continued)

WCMA Government Securities Fund and WCMA Treasury Fund

3. Capital Share Transactions:

The number of shares sold, reinvested and redeemed corresponds to the net proceeds from the sale of shares, reinvestment of dividends and cost of
shares redeemed, respectively, since shares are sold and redeemed at $1.00 per share.


Transactions in capital shares for each class were as follows:
	WCMA Government		WCMA
	Securities Fund		Treasury Fund
	Year Ended March 31,		Year Ended March 31,
	2010	2009	2010	2009
Class 1
Shares sold	236,865,916	283,482,357	703,329,859	491,011,608
Shares issued to shareholders in reinvestment of dividends and distributions	1,510	23,187	5,762	27,004
Total issued	236,867,426	283,505,544	703,335,621	491,038,612
Shares redeemed	(232,756,249)	(284,889,994)	(701,984,670)	(500,818,017)
Net increase (decrease)	4,111,177	(1,384,450)	1,350,951	(9,779,405)
Class 2
Shares sold	359,659,638	490,812,773	1,151,587,831	1,409,680,012
Shares issued to shareholders in reinvestment of dividends and distributions	10,790	419,279	50,625	626,650
Total issued	359,670,428	491,232,052	1,151,638,456	1,410,306,662
Shares redeemed	(369,432,346)	(509,395,008)	(1,216,905,646)	(1,326,947,726)
Net increase (decrease)	(9,761,918)	(18,162,956)	(65,267,190)	83,358,936
Class 3
Shares sold	848,555,042	1,247,373,657	4,198,603,120	5,155,098,196
Shares issued to shareholders in reinvestment of dividends and distributions	24,565	1,149,057	144,303	2,631,317
Total issued	848,579,607	1,248,522,714	4,198,747,423	5,157,729,513
Shares redeemed	(872,902,057)	(1,243,672,674)	(4,393,292,250)	(4,893,060,425)
Net increase (decrease)	(24,322,450)	4,850,040	(194,544,827)	264,669,088
Class 4
Shares sold	1,960,207,635	1,731,725,118	4,069,876,434	5,368,276,462
Shares issued to shareholders in reinvestment of dividends and distributions	34,234	1,733,395	142,253	3,044,237
Total issued	1,960,241,869	1,733,458,513	4,070,018,687	5,371,320,699
Shares redeemed	(2,072,527,124)	(1,726,629,282)	(4,114,996,739)	(5,277,866,731)
Net increase (decrease)	(112,285,255)	6,829,231	(44,978,052)	93,453,968

14 ANNUAL REPORT

MARCH 31, 2010

Notes to Financial Statements (concluded) WCMA Government Securities Fund and WCMA Treasury Fund

4. Federal Insurance:

The Funds participated in the US Treasury Department’s Temporary
Guarantee Program for Money Market Funds (the “Program”). As a result
of the Funds’ participation in the Program, in the event a Fund’s net
asset value fell below $0.995 per share, shareholders in the Fund would
have had federal insurance of $1.00 per share up to the lesser of a
shareholder’s balance in the Fund as of the close of business on
September 19, 2008, or the amount held in the Fund by the share-
holder on the date that the guarantee was triggered. Any increase in the
number of shares in a shareholder’s account after the close of business

on September 19, 2008 and any investments after a shareholder closed
their account would not have been guaranteed. As a participant in the
Program, which expired September 18, 2009, each Fund paid a part-
icipation fee of 0.03% for the period December 19, 2008 through
September 18, 2009 of the Fund’s shares outstanding value as of Sept-
ember 19, 2008. The participation fee for the period April 1, 2009 to
September 18, 2009 is included in federal insurance in the Statements
of Operations. These fees are not covered by the contractual agreement
to reduce fees and reimburse expenses.

5. Income Tax Information:

The tax character of distributions paid during the years ended March 31, 2010 and March 31, 2009 was as follows:


			March 31, 2010		March 31, 2009
			WCMA Government	WCMA	WCMA Government	WCMA
			Securities Fund	Treasury Fund	Securities Fund	Treasury Fund
Ordinary income			$ 71,452 $	343,594	$ 3,324,918 $	6,329,208
Total			$ 71,452 $	343,594	$ 3,324,918 $	6,329,208
As of March 31, 2010, the tax components of accumulated net earnings
were as follows:
	WCMA
	Government	WCMA
	Securities	Treasury
	Fund	Fund
Undistributed ordinary income	$ 10,978	$ 44,079
Net unrealized losses*	(1,033)	(5,980)
Total accumulated net earnings	$ 9,945	$ 38,099

* The differences between book-basis and tax-basis net unrealized losses were
attributable primarily to the timing and recognition of partnership income.

6. Subsequent Events:

Management’s evaluation of the impact of all subsequent events on the
Funds’ financial statements was completed through the date the finan-
cial statements were issued and the following items were noted:

On May 19, 2010, the Board approved names changes for WCMA
Government Securities Fund and WCMA Treasury Fund to BBIF
Government Securities Fund and BBIF Treasury Fund. The name
changes will be effective June 18, 2010.

ANNUAL REPORT

MARCH 31, 2010

Report of Independent Registered Public Accounting Firm

WCMA Government Securities Fund
and WCMA Treasury Fund

To the Shareholders and Boards of Trustees of WCMA
Government Securities Fund and WCMA Treasury Fund:

We have audited the accompanying statements of assets and liabilities
of WCMA Government Securities Fund and WCMA Treasury Fund (the
“Funds”) as of March 31, 2010, and the related statements of operations
for the year then ended, the statements of changes in net assets for
each of the two years in the period then ended, and the financial high-
lights for each of the five years in the period then ended. These financial
statements and financial highlights are the responsibility of the Funds’
management. Our responsibility is to express an opinion on these finan-
cial statements and financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public
Company Accounting Oversight Board (United States). Those standards
require that we plan and perform the audit to obtain reasonable assur-
ance about whether the financial statements and financial highlights are
free of material misstatement. The Funds are not required to have, nor
were we engaged to perform, an audit of their internal control over finan-
cial reporting. Our audits included consideration of internal control over
financial reporting as a basis for designing audit procedures that are
appropriate in the circumstances, but not for the purpose of expressing

an opinion on the effectiveness of the Funds’ internal control over finan-
cial reporting. Accordingly, we express no such opinion. An audit also
includes examining, on a test basis, evidence supporting the amounts
and disclosures in the financial statements, assessing the accounting
principles used and significant estimates made by management, as well
as evaluating the overall financial statement presentation. We believe
that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred
to above present fairly, in all material respects, the financial positions
of WCMA Government Securities Fund and WCMA Treasury Fund as of
March 31, 2010, the results of their operations for the year then ended,
the changes in their net assets for each of the two years in the period
then ended, and the financial highlights for each of the five years in the
period then ended, in conformity with accounting principles generally
accepted in the United States of America.

Deloitte & Touche LLP
Princeton, New Jersey
May 27, 2010

Important Tax Information

The following information is provided with respect to the ordinary income distributions paid by the Funds during the fiscal year ended March 31, 2010:


	WCMA
	Government	WCMA
	Securities	Treasury
	Fund	Fund
Federal Obligation Interest	21.42%*	38.41%*
Interest-Related Dividends and Qualified Short-Term Capital Gains for Non-U.S. Residents	100.00%**	100.00%**

* The law varies in each state as to whether and what percentage of dividend income attributable to Federal obligations is exempt from state income tax. We recommend
that you consult your tax advisor to determine if any portion of the dividends you received is exempt from state income taxes. Additionally, at least 50% of the assets of
WCMA Treasury Fund were invested in Federal obligations at the end of each fiscal quarter.

** Represents the portion of the taxable ordinary income dividends eligible for exemption from US withholding tax for nonresident aliens and foreign corporations.

16 ANNUAL REPORT

MARCH 31, 2010


Portfolio Information as of March 31, 2010			Master Government Securities LLC
			and Master Treasury LLC
Portfolio Composition
	Percent of		Percent of
Master Government Securities LLC	Net Assets	Master Treasury LLC	Net Assets
U.S. Treasury Obligations	60%	U.S. Treasury Obligations	109%
Repurchase Agreements	40	Liabilities in Excess of Other Assets	(9)
Total	100%	Total	100%

ANNUAL REPORT

MARCH 31, 2010

Schedule of Investments March 31, 2010

Master Government Securities LLC
(Percentages shown are based on Net Assets)


	Par
Issue	(000)	Value
U.S. Treasury Obligations
U.S. Treasury Bills (a):


0.50%, 4/01/10	$ 20,000	$ 19,999,722
0.08% — 0.15%, 4/08/10	40,001	39,999,743
0.15%, 4/15/10	35,000	34,997,813
0.03% — 0.06%, 4/22/10	20,984	20,983,247
0.19%, 4/29/10	10,000	9,998,510
0.14%, 5/06/10	5,000	4,999,288
0.11% — 0.15%, 5/13/10	48,000	47,992,636
0.10% — 0.11%, 5/20/10	5,000	4,999,285
0.14% — 0.18%, 5/27/10	16,798	16,793,905
0.13% — 0.14%, 6/03/10	10,000	9,997,653
0.16% — 0.33%, 6/17/10	52,900	52,875,017
0.18%, 7/08/10	23,000	22,988,615
0.13%, 7/15/10	7,800	7,797,014
0.50%, 7/29/10	8,000	7,986,667
0.17%, 8/12/10	35,000	34,977,853
0.19%, 8/19/10	13,500	13,490,155
0.19%, 8/26/10	15,000	14,988,283
0.19%, 9/02/10	25,000	24,980,087
0.32%, 11/18/10	15,000	14,969,550
Total U.S. Treasury Obligations — 59.6%		405,815,043
Repurchase Agreements
Bank of America Securities LLC, 0.11%, 4/07/10
(Purchased on 3/31/10 to be repurchased at
$33,000,706, collateralized by various Government
National Mortgage Association, 0.00% — 17.00% due
5/15/10 — 10/15/51, par and fair value of
$730,115,043, $33,915,221, respectively)	33,000	33,000,000
Barclays Capital Inc., 0.14%, 4/05/10 (Purchased
on 3/04/10 to be repurchased at $35,004,296,
collateralized by U.S. Treasury Note, 3.88% due
9/15/10, par and fair value of $35,061,800,
$35,700,092, respectively)	35,000	35,000,000
Citigroup Global Markets, Inc., 0.11%, 4/07/10
(Purchased on 3/31/10 to be repurchased at
$33,000,101, collateralized by various Government
National Mortgage Association, 3.12% — 11.00% due
1/15/11 — 3/15/40, par and fair value of
$498,732,568, $33,660,000, respectively)	33,000	33,000,000
Credit Suisse Securities (USA) LLC, 0.12%, 4/01/10
(Purchased on 3/25/10 to be repurchased at
$33,000,770, collateralized by various U.S. Treasury
Notes, 2.00% due 4/15/12 — 7/15/14, par and fair
value of $29,648,000, $33,383,985, respectively)	33,000	33,000,000
Deutsche Bank Securities, Inc., 0.11%, 4/07/10
(Purchased on 3/31/10 to be repurchased at
$33,000,706, collateralized by various Government
National Mortgage Association, 5.50% — 7.00% due
12/15/38 — 7/15/50, par and fair value of
$44,172,096, $33,660,001, respectively)	33,000	33,000,000
HSBC Securities (USA) Inc., 0.00%, 4/01/10
(Purchased on 3/31/10 to be repurchased at
$22,000,000, collateralized by various U.S. Treasury
Notes, 0.88% — 3.50% due 4/15/10 — 7/15/19, par
and fair value of $18,762,400, $22,337,173,
respectively)	22,000	22,000,000


	Par
Issue	(000)	Value
Repurchase Agreements (concluded)
JPMorgan Securities Inc., 0.00%, 4/01/10 (Purchased
on 3/31/10 to be repurchased at $22,000,000
collateralized by various U.S. Treasury Notes, 1.38% —
9.88% due 2/15/13 — 11/15/15, par and fair value
of $24,075,000, $22,424,080, respectively)	$ 22,000	$ 22,000,000
Mizuho Securities (USA) LLC, 0.01%, 4/01/10
(Purchased on 3/31/10 to be repurchased at
$20,000,006, collateralized by U.S. Treasury Note, 3.63%
due 4/15/28, par and fair value of $12,339,400,
$20,400,005, respectively)	20,000	20,000,000
RBS Securities Inc., 0.12%, 4/07/10 (Purchased on
3/31/10 to be repurchased at $33,000,770
collateralized by various U.S. Treasury Obligations,
0.00% — 8.13% due 6/24/10 — 11/15/39, par and
fair value of $35,001,300, $33,096,832, respectively)	33,000	33,000,000
UBS Securities LLC, 0.01%, 4/01/10 (Purchased on
3/31/10 to be repurchased at $9,192,003
collateralized by various U.S. Treasury Notes, 1.25% —
2.63% due 4/15/12 — 7/15/19, par and fair value
of $8,466,000, $9,338,070, respectively)	9,192	9,192,000
Total Repurchase Agreements — 40.2%		273,192,000
*Total Investments (Cost — $679,007,043) — 99.8%**		679,007,043
Other Assets Less Liabilities — 0.2%		1,457,474
Net Assets — 100.0%		$ 680,464,517

* Cost for federal income tax purposes.
(a) Rates shown are the discount rates or range of discount rates paid at the time of
purchase.
• Fair Value Measurements — Various inputs are used in determining the fair value
of investments, which are as follows:
• Level 1 — price quotations in active markets/exchanges for identical assets
and liabilities
• Level 2 — other observable inputs (including, but not limited to: quoted prices
for similar assets or liabilities in markets that are active, quoted prices for
identical or similar assets or liabilities in markets that are not active, inputs
other than quoted prices that are observable for the assets or liabilities (such
as interest rates, yield curves, volatilities, prepayment speeds, loss severities,
credit risks and default rates) or other market-corroborated inputs)
• Level 3 — unobservable inputs based on the best information available In
the circumstances, to the extent observable inputs are not available (including
the Master LLC's own assumptions used in determining the fair value
of investments)
The inputs or methodologies used for valuing securities are not necessarily an
indication of the risk associated with investing in those securities. For information
about the Master LLC's policy regarding valuation of investments and other
significant accounting policies, please refer to Note 1 of the Notes to
Financial Statements.
The following table summarizes the inputs used as of March 31, 2010 in deter-
mining the fair valuation of the Master LLC’s investments:


Investments in Securities

Valuation Inputs	Level 1	Level 2	Level 3	Total
Assets:
Repurchase
Agreements	—	$273,192,000	—	$273,192,000
U.S. Treasury
Obligations	—	405,815,043	—	405,815,043
Total	—	$679,007,043	—	$679,007,043

See Notes to Financial Statements.

18 ANNUAL REPORT

MARCH 31, 2010

Schedule of Investments March 31, 2010

Master Treasury LLC

(Percentages shown are based on Net Assets)


	Par
Issue	(000)	Value
U.S. Treasury Obligations
U.S. Treasury Bills (a):
0.04% — 0.50%, 4/01/10	$ 258,945	$ 258,943,465
0.05% — 0.15%, 4/08/10	168,342	168,338,603
0.04% — 0.13%, 4/15/10	497,923	497,906,910
0.06% — 0.14%, 4/22/10	59,424	59,421,596
0.06% — 0.19%, 4/29/10	206,502	206,486,934
0.10% — 0.14%, 5/06/10	236,839	236,807,000
0.11% — 0.17%, 5/13/10	371,033	370,972,948
0.10% — 0.17%, 5/20/10	52,872	52,863,714
0.10% — 0.16%, 5/27/10	140,000	139,968,111
0.13% — 0.14%, 6/03/10	88,463	88,442,309
0.15% — 0.16%, 6/10/10	163,599	163,549,883
0.16% — 0.22%, 6/17/10	99,676	99,633,530
0.16% — 0.17%, 6/24/10	175,000	174,934,184
0.15%, 7/01/10	175,000	174,934,689
0.18%, 7/08/10	75,000	74,962,875
0.13%, 7/15/10	757	756,710
0.15%, 7/22/10	50,000	49,977,243
0.14% — 0.50%, 7/29/10	107,445	107,387,592
0.17%, 8/12/10	80,000	79,949,378
0.19%, 9/02/10	50,000	49,960,174
0.24%, 9/23/10	35,000	34,958,933
0.32%, 11/18/10	25,000	24,949,250
*Total Investments (Cost — $3,116,106,031) — 109.1%**		3,116,106,031
Liabilities in Excess of Other Assets — (9.1)%		(259,877,523)
Net Assets — 100.0%		$2,856,228,508

* Cost for federal income tax purposes.
(a) Rates shown are discount rates or a range of discount rates paid at the time of
purchase.

• Fair Value Measurements — Various inputs are used in determining the fair value
of investments, which are as follows:
• Level 1 — price quotations in active markets/exchanges for identical assets
and liabilities
• Level 2 — other observable inputs (including, but not limited to: quoted prices
for similar assets or liabilities in markets that are active, quoted prices for
identical or similar assets or liabilities in markets that are not active, inputs
other than quoted prices that are observable for the assets or liabilities (such
as interest rates, yield curves, volatilities, prepayment speeds, loss severities,
credit risks and default rates) or other market-corroborated inputs)
• Level 3 — unobservable inputs based on the best information available In
the circumstances, to the extent observable inputs are not available (including
the Master LLC's own assumptions used in determining the fair value of invest-
ments)
The inputs or methodologies used for valuing securities are not necessarily an indi-
cation of the risk associated with investing in those securities. For information
about the Master LLC's policy regarding valuation of investments and other signifi-
cant accounting policies, please refer to Note 1 of the Notes to Financial
Statements.
The following table summarizes the inputs used as of March 31, 2010 in deter-
mining the fair valuation of the Master LLC’s investments:


Investments in Securities

Valuation Inputs	Level 1	Level 2	Level 3	Total
Assets:
U.S. Treasury
Obligations	—	$3,116,106,031	—	$3,116,106,031
Total	—	$3,116,106,031	—	$3,116,106,031

See Notes to Financial Statements.

ANNUAL REPORT

MARCH 31, 2010


Statements of Assets and Liabilities
	Master
	Government	Master
March 31, 2010	Securities LLC	Treasury LLC
Assets
Investments at value — unaffiliated¹	$ 405,815,043	$3,116,106,031
Repurchase agreements at value — unaffiliated²	273,192,000	—
Cash	448	955
Contributions receivable from investors	1,512,860	339,574
Interest receivable	4,436	—
Prepaid expenses	40,680	59,025
Total assets	680,565,467	3,116,505,585
Liabilities
Investments purchased payable	—	259,913,533
Investment advisory fees payable	52,628	246,200
Other affiliates payable	3,069	14,331
Officer’s and Directors’ fees payable	320	723
Other accrued expenses payable	44,933	102,290
Total liabilities	100,950	260,277,077
Net Assets	$ 680,464,517	$2,856,228,508
Net Assets Consist of
Investors’ capital	$ 680,464,517	$2,856,228,508
¹Investments at cost — unaffiliated	$ 405,815,043	$3,116,106,031
²Repurchase agreements at cost — unaffiliated	$ 273,192,000	—

See Notes to Financial Statements.

20 ANNUAL REPORT

MARCH 31, 2010


Statements of Operations
			Master
			Government	Master
Year Ended March 31, 2010			Securities LLC	Treasury LLC
Investment Income
Interest			$ 1,791,891	$ 7,786,718
Expenses
Investment advisory			1,823,881	5,421,189
Accounting services			212,261	496,220
Professional			68,519	83,089
Custodian			42,560	88,201
Officers and Directors			25,993	69,233
Printing			1,334	5,510
Other			20,346	62,482
Total expenses			2,194,894	6,225,924
Less fees waived by advisor			(1,585,400)	(1,268,850)
Less fees paid indirectly			(200)	—
Total expenses after fees waived			609,294	4,957,074
Net investment income			1,182,597	2,829,644
Realized Gain
Net realized gain from investments			37,081	264,676
Net Increase in Net Assets Resulting from Operations			$ 1,219,678	$ 3,094,320
Statements of Changes in Net Assets
	Master Government Securities LLC		Master Treasury LLC
	Year Ended March 31,		Year Ended March 31,
Increase (Decrease) in Net Assets:	2010	2009	2010	2009
Operations
Net investment income	$ 1,182,597	$ 12,798,197	$ 2,829,644	$ 38,527,822
Net realized gain	37,081	70,576	264,676	386,252
Net increase in net assets resulting from operations	1,219,678	12,868,773	3,094,320	38,914,074
Capital Transactions
Proceeds from contributions	5,503,473,147	7,917,912,535	16,001,007,571	30,062,271,749
Fair value of withdrawals	(5,994,676,614)	(8,068,455,169)	(18,866,037,313)	(27,869,340,433)
Net increase (decrease) in net assets derived from capital transactions	(491,203,467)	(150,542,634)	(2,865,029,742)	2,192,931,316
Net Assets
Total increase (decrease) in net assets	(489,983,789)	(137,673,861)	(2,861,935,422)	2,231,845,390
Beginning of year	1,170,448,306	1,308,122,167	5,718,163,930	3,486,318,540
End of year	$ 680,464,517	$1,170,448,306	$ 2,856,228,508	$ 5,718,163,930
See Notes to Financial Statements.

ANNUAL REPORT

MARCH 31, 2010


Financial Highlights			Master Government Securities LLC
		Year Ended March 31,
	2010	2009	2008	2007	2006
Total Investment Return
Total investment return	0.18%	1.05%	4.16%	4.90%	3.37%
Ratios to Average Net Assets
Total expenses	0.26%	0.23%	0.24%	0.26%	0.26%
Total expenses after fees waived and paid indirectly	0.07%	0.20%	0.24%	0.26%	0.26%
Net investment income	0.14%	1.03%	3.99%	4.84%	3.31%
Supplemental Data
Net assets, end of year (000)	$680,465	$ 1,170,448	$ 1,308,122 $	964,413	$ 968,809
				Master Treasury LLC
		Year Ended March 31,
	2010	2009	2008	2007	2006
Total Investment Return
Total investment return	0.10%	0.98%	3.87%	4.70%	3.22%
Ratios to Average Net Assets
Total expenses	0.17%	0.16%	0.21%	0.26%	0.26%
Total expenses after fees waived and paid indirectly	0.14%	0.16%	0.21%	0.26%	0.26%
Net investment income	0.08%	0.81%	3.42%	4.63%	3.14%
Supplemental Data
Net assets, end of year (000)	$2,856,229	$5,718,164	$3,486,319 $	874,719	$ 873,537

See Notes to Financial Statements.

22 ANNUAL REPORT

MARCH 31, 2010

Notes to Financial Statements Master Government Securities LLC and Master Treasury LLC

1. Organization and Significant Accounting Policies:

Master Government Securities LLC and Master Treasury LLC (collectively
the “Master LLCs” or individually a “Master LLC”) are registered under
the Investment Company Act of 1940, as amended (the “1940 Act”),
and are each organized as a Delaware limited liability company. The
Limited Liability Company Agreement of each Master LLC permits the
Board of Directors to issue non-transferable interests in that Master LLC
subject to certain limitations. The Boards of Directors of the Master LLCs
is referred to throughout this report as the “Board of Directors” or the
“Board.” The Master LLCs’ financial statements are prepared in conform-
ity with accounting principles generally accepted in the United States of
America, which may require the use of management accruals and esti-
mates. Actual results may differ from these estimates.

The following is a summary of significant accounting policies followed by
the Master LLCs:

Valuation: The Master LLCs’ policy is to fair value their financial instru-
ments at market value. The Master LLCs’ investments are valued under
the amortized cost method which approximates current market value in
accordance with Rule 2a-7 of the 1940 Act. Under this method, securi-
ties are valued at cost when purchased and thereafter, a constant pro-
portionate amortization of any discount or premium is recorded until the
maturity of the security.

Repurchase Agreements: The Master LLCs may invest in repurchase
agreements, under which the counterparty agrees to repurchase the
security at a mutually agreed upon time and price. The counterparty will
be required on a daily basis to maintain the value of the securities held
as collateral subject to the agreement at no less than the repurchase
price. The agreements are conditioned upon the collateral being
deposited under the Federal Reserve book entry system or held in a
segregated account by the Master LLCs’ custodian. In the event the
counterparty defaults and the fair value of the collateral declines, the
Master LLCs could experience losses, delays and costs in liquidating
the collateral.

Investment Transactions and Investment Income: For financial reporting
purposes, investment transactions are recorded on the dates the trans-
actions are entered into (the trade dates). Realized gains and losses on
investment transactions are determined on the identified cost basis.
Interest income, including amortization of premiums and accretion of
discount on debt securities, is recognized on the accrual basis.

Income Taxes: The Master LLCs are classified as partnerships for federal
income tax purposes. As such, each investor in each Master LLC is
treated as the owner of its proportionate share of the net assets,
income, expenses and realized and unrealized gains and losses of that
Master LLC. Therefore, no federal income tax provision is required. It is

intended that each Master LLC’s assets will be managed so an investor
in the Master LLC can satisfy the requirements of Subchapter M of the
Internal Revenue Code of 1986, as amended.

Each Master LLC files US federal and various state and local tax returns.
In October, 2009, the Internal Revenue Service commenced an exami-
nation of Master Treasury LLC’s US federal tax return for the year ended
March 31, 2008. The examination was completed in April, 2010 and did
not result in any adjustments to the tax return. Master Government
Securities LLC’s income tax returns are not currently under examination.
The statute of limitations on each Master LLC’s US federal tax returns
remain open for each of the four years ended March 31, 2010. The
statutes of limitations on each Master LLC’s state and local tax returns
may remain open for an additional year depending upon the jurisdiction.

Recent Accounting Standard: In January 2010, the Financial Accounting
Standards Board issued amended guidance to improve disclosures
about fair value measurements which will require additional disclosures
about transfers into and out of Levels 1 and 2 and separate disclosures
about purchases, sales, issuances and settlements in the reconciliation
for fair value measurements using significant unobservable inputs (Level
3). It also clarifies existing disclosure requirements relating to the levels
of disaggregation for fair value measurement and inputs and valuation
techniques used to measure fair value. The amended guidance is effec-
tive for financial statements for fiscal years beginning after December
15, 2009, and interim periods within those fiscal years, except for dis-
closures about purchases, sales, issuances and settlements in the roll-
forward of activity in Level 3 fair value measurements, which are effective
for fiscal years beginning after December 15, 2010, and for interim peri-
ods within those fiscal years. The impact of this guidance on the Master
LLCs’ financial statements and disclosures is currently being assessed.

Other: Expenses directly related to each Master LLC are charged to that
Master LLC. Other operating expenses shared by several funds are pro-
rated among those funds on the basis of relative net assets or other
appropriate methods. The Master LLCs have an arrangement with the
custodian whereby fees may be reduced by credits earned on uninvested
cash balances, which if applicable are shown as fees paid indirectly in
the Statements of Operations. The custodian imposes fees on overdrawn
cash balances, which can be offset by accumulated credits earned or
may result in additional custody charges.

2. Investment Advisory Agreement and Other Transactions
with Affiliates:

The PNC Financial Services Group, Inc. (“PNC”), Bank of America
Corporation (“BAC”) and Barclays Bank PLC (“Barclays”) are the largest
stockholders of BlackRock, Inc. (“BlackRock”). Due to the ownership
structure, PNC is an affiliate of the Master LLCs for 1940 Act purposes,
but BAC and Barclays are not.

ANNUAL REPORT

MARCH 31, 2010

Notes to Financial Statements (concluded) Master Government Securities LLC and Master Treasury LLC

The Master LLCs entered into an Investment Advisory Agreement with
BlackRock Advisors, LLC (the “Manager”), an indirect, wholly owned sub-
sidiary of BlackRock, to provide investment advisory and administration
services. The Manager is responsible for the management of each
Master LLC’s portfolio and provides the necessary personnel, facilities,
equipment and certain other services necessary to the operations of
each Master LLC. For such services, each Master LLC pays the Manager
a monthly fee at the following annual rates of each Master LLC’s average
daily net assets as follows:


Not exceeding $500 million	0.25%
In excess of $500 million , but not exceeding $1 billion	0.175%
In excess of $1 billion	0.125%

The Manager voluntarily agreed to waive a portion of the advisory fees
and/or reimburse operating expenses of each Master LLC to enable the
feeders that invest in the Master LLCs, respectively, to maintain minimum
levels of net investment income. These amounts are shown as fees
waived by advisor in the Statements of Operations. The Manager may
discontinue this waiver or reimbursement at any time.

The Manager has entered into a separate sub-advisory agreement with
BlackRock Institutional Management Corporation (“BIMC”), an affiliate of
the Manager, under which the Manager pays BIMC for services it pro-
vides, a monthly fee that is a percentage of the investment advisory fee
paid by each Master LLC to the Manager.

For the year ended March 31, 2010, the Master LLCs reimbursed the
Manager the following amounts for certain accounting services, which
are included in accounting services in the Statements of Operations:


	Reimbursement
	to Manager
Master Government Securities LLC	$ 15,572
Master Treasury LLC	$ 83,249

Certain officers and/or directors of the Master LLCs are officers and/or
directors of BlackRock or its affiliates.

3. Market and Credit Risk:

In the normal course of business, each Master LLC invests in securities
and enters into transactions where risks exist due to fluctuations in the
market (market risk) or failure of the issuer of a security to meet all its
obligations (credit risk). The value of securities held by each Master LLC
may decline in response to certain events, including those directly involv-
ing the issuers whose securities are owned by the respective Master LLC;
conditions affecting the general economy; overall market changes; local,
regional or global political, social or economic instability; and currency
and interest rate and price fluctuations. Similar to credit risk, each
Master LLC may be exposed to counterparty risk, or the risk that an
entity with which each Master LLC has unsettled or open transactions
may default. The Master LLCs manage counterparty risk by entering into
transactions only with counterparties that they believe have the financial
resources to honor their obligations and by monitoring the financial
stability of those counterparties. Financial assets, which potentially
expose each Master LLC to credit and counterparty risks, consist princi-
pally of investments and cash due from counterparties. The extent of
each Master LLC’s exposure to credit and counterparty risks with respect
to these financial assets is by their value recorded in the Master LLCs’
Statements of Assets and Liabilities, less any collateral held by the
Master LLCs.

4. Subsequent Events:

Management has evaluated the impact of all subsequent events on each
Master LLC through the date the financial statements were issued, and
has determined that there were no subsequent events requiring adjust-
ment or additional disclosure in the financial statements.

24 ANNUAL REPORT

MARCH 31, 2010

Report of Independent Registered Public Accounting Firm

Master Government Securities LLC
and Master Treasury LLC

To the Investors and Boards of Directors of Master
Government Securities LLC and Master Treasury LLC:

We have audited the accompanying statements of assets and liabilities
of Master Government Securities LLC and Master Treasury LLC (the
“Master LLCs”), including the schedules of investments, as of March 31,
2010, and the related statements of operations for the year then ended,
the statements of changes in net assets for each of the two years in the
period then ended, and the financial highlights for each of the five
years in the period then ended. These financial statements and financial
highlights are the responsibility of the Master LLCs’ management. Our
responsibility is to express an opinion on these financial statements
and financial highlights based on our audits.

We conducted our audits in accordance with the standards of the Public
Company Accounting Oversight Board (United States). Those standards
require that we plan and perform the audit to obtain reasonable assur-
ance about whether the financial statements and financial highlights
are free of material misstatement. The Master LLCs are not required to
have, nor were we engaged to perform, an audit of their internal control
over financial reporting. Our audits included consideration of internal
control over financial reporting as a basis for designing audit procedures
that are appropriate in the circumstances, but not for the purpose of
expressing an opinion on the effectiveness of the Master LLCs’ internal
control over financial reporting. Accordingly, we express no such opinion.

An audit also includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by manage-
ment, as well as evaluating the overall financial statement presentation.
Our procedures included confirmation of securities owned as of March
31, 2010, by correspondence with the custodian and brokers; where
replies were not received from brokers, we performed other auditing
procedures. We believe that our audits provide a reasonable basis for
our opinion.

In our opinion, the financial statements and financial highlights referred
to above present fairly, in all material respects, the financial positions
of Master Government Securities LLC and Master Treasury LLC as of
March 31, 2010, the results of their operations for the year then ended,
the changes in their net assets for each of the two years in the period
then ended, and the financial highlights for each of the five years in the
period then ended, in conformity with accounting principles generally
accepted in the United States of America.

Deloitte & Touche LLP
Princeton, New Jersey
May 27, 2010

ANNUAL REPORT

MARCH 31, 2010


Officers and Directors
				Number of BlackRock-
				Advised Registered
	Position(s)	Length		Investment Companies
	Held with	of Time		(“RICs”) Consisting of
Name, Address	Funds/	Served as		Investment Portfolios	Public
and Year of Birth	Master LLCs	a Director²	Principal Occupation(s) During Past 5 Years	(“Portfolios”) Overseen	Directorships
Non-Interested Directors¹
Ronald W. Forbes	Co-Chair of	Since	Professor Emeritus of Finance, School of Business, State University	36 RICs consisting of	None
55 East 52nd Street	the Board	2002	of New York at Albany since 2000.	104 Portfolios
New York, NY 10055	and Director
1940
Rodney D. Johnson	Co-Chair of	Since	President, Fairmount Capital Advisors, Inc. since 1987; Director,	36 RICs consisting of	None
55 East 52nd Street	the Board	2007	Fox Chase Cancer Center since 2004; Member of the Archdiocesan	104 Portfolios
New York, NY 10055	and Director		Investment Committee of the Archdiocese of Philadelphia since
1941			2004; Director, The Committee of Seventy (civic) since 2006.
David O. Beim	Director	Since	Professor of Finance and Economics at the Columbia University	36 RICs consisting of	None
55 East 52nd Street		2007	Graduate School of Business since 1991; Trustee, Phillips Exeter	104 Portfolios
New York, NY 10055			Academy since 2002; Chairman, Wave Hill, Inc. (public garden and
1940			cultural center) from 1990 to 2006.
Dr. Matina Horner	Director	Since	Executive Vice President of Teachers Insurance and Annuity Associa-	36 RICs consisting of	NSTAR (electric
55 East 52nd Street		2007	tion and College Retirement Equities Fund from 1989 to 2003.	104 Portfolios	and gas utility)
New York, NY 10055
1939
Herbert I. London	Director and	Since	Professor Emeritus, New York University since 2005; John M. Olin	36 RICs consisting of	AIMS Worldwide,
55 East 52nd Street	Member of the	2007	Professor of Humanities, New York University from 1993 to 2005	104 Portfolios	Inc. (marketing)
New York, NY 10055	Audit Committee		and Professor thereof from 1980 to 2005; President, Hudson
1939			Institute (policy research organization) since 1997 and Trustee
			thereof since 1980; Chairman of the Board of Trustees for Grantham
			University since 2006; Director, InnoCentive, Inc. (strategic solutions
			company) since 2005; Director, Cerego, LLC (software development
			and design) since 2005.
Cynthia A. Montgomery	Director	Since	Professor, Harvard Business School since 1989; Director, Harvard	36 RICs consisting of	Newell Rubbermaid,
55 East 52nd Street		2002	Business School Publishing since 2005; Director, McLean Hospital	104 Portfolios	Inc. (manufacturing)
New York, NY 10055			since 2005.
1952
Joseph P. Platt, Jr.	Director	Since	Director, The West Penn Allegheny Health System (a not-for-profit	36 RICs consisting of	Greenlight Capital
55 East 52nd Street		2007	health system) since 2008; Director, Jones and Brown (Canadian	104 Portfolios	Re, Ltd (reinsurance
New York, NY 10055			insurance broker) since 1998; General Partner, Thorn Partners, LP		company); WQED
1947			(private investment) since 1998; Partner, Amarna Corporation, LLC		Multi-Media (public
			(private investment company) from 2002 to 2008.		broadcasting not-for-
					profit)
Robert C. Robb, Jr.	Director	Since	Partner, Lewis, Eckert, Robb and Company (management and	36 RICs consisting of	None
55 East 52nd Street		2007	financial consulting firm) since 1981.	104 Portfolios
New York, NY 10055
1945
Toby Rosenblatt	Director	Since	President, Founders Investments Ltd. (private investments) since	36 RICs consisting of	A.P. Pharma, Inc.
55 East 52nd Street		2007	1999; Director, College Access Foundation of California	104 Portfolios	(specialty
New York, NY 10055			(philanthropic foundation) since 2009; Director, Forward		pharmaceuticals)
1938			Management, LLC since 2007; Director, The James Irvine
Foundation (philanthropic foundation) from 1998 to 2008.

26 ANNUAL REPORT

MARCH 31, 2010


Officers and Directors (continued)
				Number of BlackRock-
				Advised Registered
		Length		Investment Companies
	Position(s)	of Time		(“RICs”) Consisting of
Name, Address	Held with	Served as		Investment Portfolios	Public
and Year of Birth	Funds/Master LLCs	a Director²	Principal Occupation(s) During Past 5 Years	(“Portfolios”) Overseen	Directorships
Non-Interested Directors¹(concluded)
Kenneth L. Urish	Chair of the Audit	Since	Managing Partner, Urish Popeck & Co., LLC (certified public	36 RICs consisting of	None
55 East 52nd Street	Committe and	2007	accountants and consultants) since 1976; Member of External	104 Portfolios
New York, NY 10055	Director		Advisory Board, The Pennsylvania State University Accounting
1951			Department since 2001; Trustee, The Holy Family Foundation
			since 2001; Committee Member, Professional Ethics Committee
of the Pennsylvania Institute of Certified Public Accountants
			from 2007 to 2010; President and Trustee, Pittsburgh Catholic
			Publishing Associates from 2003 to 2008; Director, Inter-Tel from
			2006 to 2007.
Frederick W. Winter	Director and	Since	Professor and Dean Emeritus of the Joseph M. Katz School of	36 RICs consisting of	None
55 East 52nd Street	Member of the	2007	Business, University of Pittsburgh since 2005 and Dean thereof	104 Portfolios
New York, NY 10055	Audit Committee		from 1997 to 2005; Director, Alkon Corporation (pneumatics)
1945			since 1992; Director, Tippman Sports (recreation) since 2005;
			Director, Indotronix International (IT services) from 2004 to 2008.
	¹Directors serve until their resignation, removal or death, or until December 31 of the year in which they turn 72. The Boards have approved one-year
	extensions in the terms of Directors who turn 72 prior to December 31, 2013.
	²Date shown is the earliest date a person has served as a director for the Funds/Master LLCs covered by this annual report. Following the combination of
	Merrill Lynch Investment Managers, L.P. (“MLIM”) and BlackRock, Inc. (“BlackRock”) in September 2006, the various legacy MLIM and legacy BlackRock
	fund boards were realigned and consolidated into three new fund boards in 2007. As a result, although the chart shows certain directors as joining the
	Funds’/Master LLCs’ boards in 2007, each director first became a member of the board of other legacy MLIM or legacy BlackRock funds as follows:
	David O. Beim, 1998; Ronald W. Forbes, 1977; Dr. Matina Horner, 2004; Rodney D. Johnson, 1995; Herbert I. London, 1987; Cynthia A. Montgomery,
	1994; Joseph P. Platt, Jr., 1999; Robert C. Robb, Jr., 1998; Toby Rosenblatt, 2005; Kenneth L. Urish, 1999 and Frederick W. Winter, 1999.
Interested Directors³
Richard S. Davis	Director	Since	Managing Director, BlackRock, Inc. since 2005; Chief Executive	169 RICs consisting of	None
55 East 52nd Street		2007	Officer, State Street Research & Management Company from 2000	298 Portfolios
New York, NY 10055			to 2005; Chairman of the Board of Trustees, State Street Research
1945			Mutual Funds from 2000 to 2005.
Henry Gabbay	Director	Since	Consultant, BlackRock, Inc. from 2007 to 2008; Managing Director, 169 RICs consisting of		None
55 East 52nd Street		2007	BlackRock, Inc. from 1989 to 2007; Chief Administrative Officer,	298 Portfolios
New York, NY 10055			BlackRock Advisors, LLC from 1998 to 2007; President of BlackRock
1947			Funds and BlackRock Bond Allocation Target Shares from 2005 to
			2007 and Treasurer of certain closed-end funds in the BlackRock
			fund complex from 1989 to 2006.

³Mr. Davis is an “interested person” as defined in the 1940 Act, of the Funds/Master LLCs based on his position with BlackRock, Inc. and its affiliates.
Mr. Gabbay is an “interested person” of the Funds/Master LLCs based on his former positions with BlackRock, Inc. and its affiliates as well as his owner-
ship of BlackRock, Inc. and The PNC Financial Services Group, Inc. securities. Directors serve until their resignation, removal or death, or until December
31 of the year in which they turn 72. The Boards have approved one-year extensions in the terms of Directors who turn 72 prior to December 31, 2013.

ANNUAL REPORT

MARCH 31, 2010


Officers and Directors (concluded)
	Position(s)
Name, Address	Held with		Length of
and Year of Birth	Funds/Master LLCsTime Served			Principal Occupation(s) During Past 5 Years
Officers¹
Anne Ackerley	President and		Since	Managing Director of BlackRock, Inc. since 2000; Vice President of the BlackRock-advised funds from 2007 to
55 East 52nd Street	Chief Executive		2009²	2009; Chief Operating Officer of BlackRock’s Global Client Group (GCG) since 2009; Chief Operating Officer
New York, NY 10055	Officer			of BlackRock’s U.S. Retail Group from 2006 to 2009; Head of BlackRock’s Mutual Fund Group from 2000
1962				to 2006.
Richard Hoerner, CFA	Vice		Since	Managing Director of BlackRock, Inc. since 2000; Co-head of BlackRock’s Cash Management Portfolio Management
55 East 52nd Street	President		2009	Group since 2002; Member of the Cash Management Group Executive Committee since 2005.
New York, NY 10055
1958
Jeffrey Holland, CFA	Vice		Since	Managing Director of BlackRock, Inc. since 2010; Director of BlackRock, Inc. from 2006 to 2009; Chief Operating
55 East 52nd Street	President		2009	Officer of BlackRock’s U.S. Retail Group since 2009; Co-head of Product Development and Management for
New York, NY 10055				BlackRock’s U.S. Retail Group from 2007 to 2009; Product Manager of Raymond James & Associates from
1971				2003 to 2006.
Brendan Kyne	Vice		Since	Managing Director of BlackRock, Inc. since 2010; Director of BlackRock, Inc. from 2008 to 2009; Head of Product
55 East 52nd Street	President		2009	Development and Management for BlackRock’s U.S. Retail Group since 2009, Co-head thereof from 2007 to
New York, NY 10055				2009; Vice President of BlackRock, Inc. from 2005 to 2008.
1977
Simon Mendelson	Vice		Since	Managing Director of BlackRock, Inc. since 2005; Chief Operating Officer and head of the Global Client Group for
55 East 52nd Street	President		2009	BlackRock’s Global Cash Management Business since 2007; Head of BlackRock’s Strategy and Development Group
New York, NY 10055				from 2005 to 2007; Partner of McKinsey & Co. from 1997 to 2005.
1964
Brian Schmidt	Vice		Since	Managing Director of BlackRock, Inc. since 2004; Various positions with U.S. Trust Company from 1991 to 2003
55 East 52nd Street	President		2009	including Director from 2001 to 2003 and Senior Vice President from 1998 to 2003; Vice President, Chief Financial
New York, NY 10055				Officer and Treasurer of Excelsior Funds, Inc., Excelsior Tax-Exempt Funds, Inc. and Excelsior Funds Trust from 2001
1958				to 2003.
Christopher Stavrakos, CFA Vice			Since	Managing Director of BlackRock, Inc. since 2006; Co-head of BlackRock’s Cash Management Portfolio
55 East 52nd Street	President		2009	Management Group since 2006; Senior Vice President, CIO, and Director of Liability Management for the
New York, NY 10055				Securities Lending Group at Mellon Bank from 1999 to 2006.
1959
Neal Andrews	Chief		Since	Managing Director of BlackRock, Inc. since 2006; Senior Vice President and Line of Business Head of Fund
55 East 52nd Street	Financial		2007	Accounting and Administration at PNC Global Investment Servicing (U.S.) Inc. from 1992 to 2006.
New York, NY 10055	Officer
1966
Jay Fife	Treasurer		Since	Managing Director of BlackRock, Inc. since 2007 and Director in 2006; Assistant Treasurer of the Merrill Lynch
55 East 52nd Street			2007	Investment Managers, L.P. (“MLIM”) and Fund Asset Management, L.P. advised funds from 2005 to 2006; Director
New York, NY 10055				of MLIM Fund Services Group from 2001 to 2006.
1970
Brian Kindelan	Chief		Since	Chief Compliance Officer of the BlackRock-advised funds since 2007; Managing Director and Senior Counsel of
55 East 52nd Street	Compliance		2007	BlackRock, Inc. since 2005.
New York, NY 10055	Officer
1959
Howard Surloff	Secretary		Since	Managing Director and General Counsel of U.S. Funds of BlackRock, Inc. since 2006; General Counsel (U.S.) of
55 East 52nd Street			2007	Goldman Sachs Asset Management, L.P. from 1993 to 2006.
New York, NY 10055
1965				��
	¹Officers of the Funds/Master LLCs serve at the pleasure of the Boards.
	²Ms. Ackerley has been President and Chief Executive Officer since 2009 and was Vice President from 2007 to 2009.
	Further information about the Officers and Directors is available in the Funds’/Master LLCs’ Statement of Additional Information, which can be obtained
	without charge by calling (800) 221-7210.
Investment Advisor		Custodian			Accounting Agent	Distributor	Address of the Funds
and Administrator		State Street Bank			State Street Bank	BlackRock Investments, LLC	100 Bellevue Parkway
BlackRock Advisors, LLC		and Trust Company			and Trust Company	New York, NY 10022	Wilmington, DE 19809
Wilmington, DE 19809		Boston, MA 02111			Princeton, NJ 08540
Sub-Advisor		Transfer Agent			Independent Registered	Legal Counsel
BlackRock Institutional		Financial Data			Public Accounting Firm	Sidley Austin LLP
Management Corporation		Services, Inc.			Deloitte & Touche LLP	New York, NY 10019
Wilmington, DE 19809		Jacksonville, FL 32246			Princeton, NJ 08540

28 ANNUAL REPORT

MARCH 31, 2010

Additional Information

General Information

Electronic Delivery

Electronic copies of most financial reports and prospectuses are available
on the Fund’s website or shareholders can sign up for e-mail notifications
of quarterly statements, annual and semi-annual reports and prospec-
tuses by enrolling in the Fund’s electronic delivery program.

Shareholders Who Hold Accounts with Investment Advisors, Banks or
Brokerages:

Please contact your financial advisor to enroll. Please note that not all
investment advisors, banks or brokerages may offer this service.

Householding

The Funds will mail only one copy of shareholder documents, including
prospectuses, annual and semi-annual reports and proxy statements, to
shareholders with multiple accounts at the same address. This practice
is commonly called “householding” and it is intended to reduce
expenses and eliminate duplicate mailings of shareholder documents.
Mailings of your shareholder documents may be householded indefi-
nitely unless you instruct us otherwise. If you do not want the mailing
of these documents to be combined with those for other members of
your household, please contact the Fund at (800) 221-7210.

Availability of Quarterly Portfolio Schedule

The Funds/Master LLCs file their complete schedule of portfolio
holdings with the Securities and Exchange Commission (the “SEC”)

for the first and third quarters of each fiscal year on Form N-Q. The
Funds’/Master LLCs’ Forms N-Q are available on the SEC’s website
at http://www.sec.gov and may also be reviewed and copied at the
SEC’s Public Reference Room in Washington, D.C. Information on the
operation of the Public Reference Room may be obtained by calling
(800) SEC-0330. The Funds’/Master LLCs’ Forms N-Q may also be
obtained upon request and without charge by calling (800) 221-7210.

Availability of Proxy Voting Policies and Procedures

A description of the policies and procedures that the Funds/Master
LLCs use to determine how to vote proxies relating to portfolio
securities is available (1) without charge, upon request, by calling
(800) 221-7210; (2) at www.blackrock.com; and (3) on the SEC’s
website at http://www.sec.gov

Availability of Proxy Voting Record

Information about how the Funds/Master LLCs voted proxies relating to
securities held in the Funds’/Master LLCs’ portfolio during the most
recent 12-month period ended June 30 is available upon request and
without charge (1) at www.blackrock.com or by calling (800) 221-7210
and (2) on the SEC’s website at http://www.sec.gov.

ANNUAL REPORT

MARCH 31, 2010

Additional Information (concluded)

BlackRock Privacy Principles

BlackRock is committed to maintaining the privacy of its current and
former fund investors and individual clients (collectively, “Clients”) and
to safeguarding their non-public personal information. The following
information is provided to help you understand what personal informa-
tion BlackRock collects, how we protect that information and why in cer-
tain cases we share such information with select parties.

If you are located in a jurisdiction where specific laws, rules or regula-
tions require BlackRock to provide you with additional or different pri-
vacy-related rights beyond what is set forth below, then BlackRock will
comply with those specific laws, rules or regulations.

BlackRock obtains or verifies personal non-public information from and
about you from different sources, including the following: (i) information
we receive from you or, if applicable, your financial intermediary, on
applications, forms or other documents; (ii) information about your
transactions with us, our affiliates, or others; (iii) information we receive
from a consumer reporting agency; and (iv) from visits to our websites.

BlackRock does not sell or disclose to non-affiliated third parties any
non-public personal information about its Clients, except as permitted
by law or as is necessary to respond to regulatory requests or to service
Client accounts. These non-affiliated third parties are required to protect
the confidentiality and security of this information and to use it only for
its intended purpose.

We may share information with our affiliates to service your account or
to provide you with information about other BlackRock products or serv-
ices that may be of interest to you. In addition, BlackRock restricts
access to non-public personal information about its Clients to those
BlackRock employees with a legitimate business need for the informa-
tion. BlackRock maintains physical, electronic and procedural safeguards
that are designed to protect the non-public personal information of its
Clients, including procedures relating to the proper storage and disposal
of such information.

30 ANNUAL REPORT

MARCH 31, 2010

#WCMAGOVTR-3/10

This report is transmitted to shareholders only. It is not authorized
for use as an offer of sale or a solicitation of an offer to buy shares
of the Funds unless accompanied or preceded by each Fund’s cur-
rent prospectus. An investment in the Funds is not insured or guar-
anteed by the Federal Deposit Insurance Corporation or any other
government agency. Although the Funds seek to preserve the value
of your investment at $1.00 per share, it is possible to lose money
by investing in the Funds. Total return information assumes rein-
vestment of all distributions. Past performance results shown in
this report should not be considered a representation of future
performance. For current month-end performance information,
call (800) 221-7210. Each Fund’s current 7-day yield more closely
reflects the current earnings of the Fund than the total returns
quoted. Statements and other information herein are as dated
and are subject to change.

Item 2 – Code of Ethics – The registrant (or the “Fund”) has adopted a code of ethics, as of the end
of the period covered by this report, applicable to the registrant’s principal executive officer,
principal financial officer and principal accounting officer, or persons performing similar
functions. During the period covered by this report, there have been no amendments to or
waivers granted under the code of ethics. A copy of the code of ethics is available without
charge at www.blackrock.com.

Item 3 – Audit Committee Financial Expert – The registrant’s board of directors or trustees, as
applicable (the “board of directors”) has determined that (i) the registrant has the following
audit committee financial expert serving on its audit committee and (ii) each audit
committee financial expert is independent:
Kenneth L. Urish

Under applicable securities laws, a person determined to be an audit committee financial
expert will not be deemed an “expert” for any purpose, including without limitation for the
purposes of Section 11 of the Securities Act of 1933, as a result of being designated or
identified as an audit committee financial expert. The designation or identification as an
audit committee financial expert does not impose on such person any duties, obligations, or
liabilities greater than the duties, obligations, and liabilities imposed on such person as a
member of the audit committee and board of directors in the absence of such designation or
identification.

Item 4 – Principal Accountant Fees and Services


	(a) Audit Fees		(b) Audit-Related Fees¹		(c) Tax Fees²		(d) All Other Fees³
	Current	Previous	Current	Previous	Current	Previous	Current	Previous
	Fiscal Year	Fiscal Year	Fiscal Year	Fiscal Year	Fiscal Year	Fiscal Year	Fiscal Year	Fiscal Year
Entity Name	End	End	End	End	End	End	End	End
WCMA Treasury	$6,800	$6,800	$0	$0	$6,100	$6,100	$450	$733
Fund
Master Treasury
LLC	$24,400	$24,400	$0	$0	$9,200	$6,100	$0	$0

1 The nature of the services include assurance and related services reasonably related to the performance of the audit of
financial statements not included in Audit Fees.
2 The nature of the services include tax compliance, tax advice and tax planning.
3 The nature of the services include a review of compliance procedures and attestation thereto.

(e)(1) Audit Committee Pre-Approval Policies and Procedures:
The registrant’s audit committee (the “Committee”) has adopted policies and
procedures with regard to the pre-approval of services. Audit, audit-related and tax
compliance services provided to the registrant on an annual basis require specific pre-
approval by the Committee. The Committee also must approve other non-audit services
provided to the registrant and those non-audit services provided to the registrant’s affiliated
service providers that relate directly to the operations and the financial reporting of the
registrant. Certain of these non-audit services that the Committee believes are a) consistent
with the SEC’s auditor independence rules and b) routine and recurring services that will
not impair the independence of the independent accountants may be approved by the
Committee without consideration on a specific case-by-case basis (“general pre-approval”).
The term of any general pre-approval is 12 months from the date of the pre-approval, unless
the Committee provides for a different period. Tax or other non-audit services provided to
the registrant which have a direct impact on the operation or financial reporting of the
registrant will only be deemed pre-approved provided that any individual project does not
exceed $10,000 attributable to the registrant or $50,000 for all of the registrants the

Committee oversees. For this purpose, multiple projects will be aggregated to determine if
they exceed the previously mentioned cost levels.
Any proposed services exceeding the pre-approved cost levels will require specific
pre-approval by the Committee, as will any other services not subject to general pre-
approval (e.g., unanticipated but permissible services). The Committee is informed of each
service approved subject to general pre-approval at the next regularly scheduled in-person
board meeting. At this meeting, an analysis of such services is presented to the Committee
for ratification. The Committee may delegate to one or more of its members the authority to
approve the provision of and fees for any specific engagement of permitted non-audit
services, including services exceeding pre-approved cost levels.

(e)(2) None of the services described in each of Items 4(b) through (d) were approved by
the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X.


(f) Not Applicable
(g) Affiliates’ Aggregate Non-Audit Fees:
	Current Fiscal Year	Previous Fiscal Year
Entity Name	End	End
WCMA Treasury Fund	$17,327	$414,333
Master Treasury LLC	$19,977	$413,600

(h) The registrant’s audit committee has considered and determined that the provision of
non-audit services that were rendered to the registrant’s investment adviser (not including
any non-affiliated sub-adviser whose role is primarily portfolio management and is
subcontracted with or overseen by the registrant’s investment adviser), and any entity
controlling, controlled by, or under common control with the investment adviser that
provides ongoing services to the registrant that were not pre-approved pursuant to paragraph
(c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal
accountant’s independence.

Regulation S-X Rule 2-01(c)(7)(ii) – $10,777, 0%

Item 5 – Audit Committee of Listed Registrants – Not Applicable

Item 6 – Investments
(a) The registrant’s Schedule of Investments is included as part of the Report to
Stockholders filed under Item 1 of this form.
(b) Not Applicable due to no such divestments during the semi-annual period covered since
the previous Form N-CSR filing.

Item 7 – Disclosure of Proxy Voting Policies and Procedures for Closed-End Management
Investment Companies – Not Applicable

Item 8 – Portfolio Managers of Closed-End Management Investment Companies – Not Applicable

Item 9 – Purchases of Equity Securities by Closed-End Management Investment Company and
Affiliated Purchasers – Not Applicable

Item 10 – Submission of Matters to a Vote of Security Holders – The registrant’s Nominating and
Governance Committee will consider nominees to the board of directors recommended by
shareholders when a vacancy becomes available. Shareholders who wish to recommend a

nominee should send nominations which include biographical information and set forth the
qualifications of the proposed nominee to the registrant’s Secretary. There have been no
material changes to these procedures.

Item 11 – Controls and Procedures

11(a) – The registrant’s principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant’s disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
“1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 15(d)-15(b) under the Securities Exchange Act of 1934, as amended.

11(b) – There were no changes in the registrant’s internal control over financial reporting (as
defined in Rule 30a-3(d) under the 1940 Act) that occurred during the second fiscal quarter
of the period covered by this report that have materially affected, or are reasonably likely to
materially affect, the registrant’s internal control over financial reporting.

Item 12 – Exhibits attached hereto

12(a)(1) – Code of Ethics – See Item 2

12(a)(2) – Certifications – Attached hereto

12(a)(3) – Not Applicable

12(b) – Certifications – Attached hereto

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by
the undersigned, thereunto duly authorized.

WCMA Treasury Fund and Master Treasury LLC

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
WCMA Treasury Fund and Master Treasury LLC

Date: May 27, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer (principal executive officer) of
WCMA Treasury Fund and Master Treasury LLC

Date: May 27, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
WCMA Treasury Fund and Master Treasury LLC

Date: May 27, 2010

Bbif Treasury Fund Inactive N-CSRCertified annual shareholder report (management investment company)