require management’s most significant exercise of judgment on both a quantitative and qualitative basis. The accounting estimates that result require the use of assumptions about certain matters that are highly uncertain at the time of estimation. To the extent actual experience differs from the assumptions used, our financial condition, results of operations and cash flows would be affected, possibly materially.
See Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Estimates” of the 2018 Form
10-K
for a more complete description of our critical accounting estimates.
In general, we follow a policy of maintaining a relatively liquid financial condition at our unrestricted holding companies. This policy has permitted us to expand our operations through internal growth at our subsidiaries and through acquisitions of, or substantial investments in, operating companies. As of June 30, 2019, we held total marketable securities and cash of $1,405.4 million compared with $1,122.3 million as of December 31, 2018. The increase in the six months ended June 30, 2019 primarily reflects appreciation in the value of the equity securities portfolio held at the holding company-level and the receipt of dividends from TransRe and RSUI, partially offset by repurchases of shares of our common stock, as discussed below. The $1,405.4 million is comprised of $430.0 million at the Alleghany parent company, $889.0 million at AIHL and $86.4 million at the TransRe holding company. We also hold certain
non-marketable
investments at our unrestricted holding companies. We believe that we have and will have adequate internally generated funds, cash resources and unused credit facilities to provide for the currently foreseeable needs of our business, and we had no material commitments for capital expenditures as of June 30, 2019.
Stockholders’ equity attributable to Alleghany stockholders was approximately $8.7 billion as of June 30, 2019, compared with approximately $7.7 billion as of December 31, 2018. The increase in stockholders’ equity in the first six months of 2019 primarily reflects net earnings and appreciation in the value of our debt securities portfolio due to a decrease in interest rates and credit spreads, partially offset by repurchases of our common stock, all as discussed below. As of June 30, 2019, we had 14,430,862 shares of our common stock outstanding, compared with 14,576,509 shares of our common stock outstanding as of December 31, 2018.
On September 9, 2014, we completed a public offering of $300.0 million aggregate principal amount of our 4.90% senior notes due on September 15, 2044. On June 26, 2012, we completed a public offering of $400.0 million aggregate principal amount of our 4.95% senior notes due on June 27, 2022. On September 20, 2010, we completed a public offering of $300.0 million aggregate principal amount of our 5.625% senior notes due on September 15, 2020. See Note 8 to Notes to Consolidated Financial Statements set forth in Part II, Item 8, “Financial Statements and Supplementary Data” of the 2018 Form
10-K
for additional information on the senior notes.
On July 31, 2017, we entered into a five-year credit agreement, or the “Credit Agreement,” with certain lenders party thereto, which provides for an unsecured revolving credit facility in an aggregate principal amount of up to $300.0 million. The credit facility is scheduled to expire on July 31, 2022, unless earlier terminated. Borrowings under the Credit Agreement will be available for working capital and general corporate purposes, including permitted acquisitions and repurchases of common stock. Borrowings under the Credit Agreement bear a floating rate of interest based in part on our credit rating, among other factors. The Credit Agreement contains representations, warranties and covenants customary for bank loan facilities of this nature.
There were no borrowings under the Credit Agreement from inception through June 30, 2019.
Common Stock Repurchases.
In November 2015, our Board of Directors authorized the repurchase of shares of our common stock at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million, or the “2015 Repurchase Program.” In June 2018, our Board of Directors authorized, upon the completion of the 2015 Repurchase Program, the repurchase of additional shares of our common stock at such times and at prices as management determines to be advisable, up to an aggregate of $400.0 million, or the “2018 Repurchase Program.” In the fourth quarter of 2018, we completed the 2015 Repurchase Program and subsequent repurchases have been made pursuant to the 2018 Repurchase Program. As of June 30, 2019, we had $178.3 million remaining under our repurchase authorization.
The following table presents the shares of our common stock that we repurchased in the three and six months ended June 30, 2019 and 2018:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | Three Months Ended June 30, | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Cost of shares repurchased (in millions) | | $ | | | | | | | | $ | | | | | | | | $ | | | | | | | | $ | | |
Average price per share repurchased | | $ | | | | | | | | $ | | | | | | | | $ | | | | | | | | $ | | |
In February 2018, our Board of Directors declared a special dividend of $10.00 per share for stockholders of record on March 5, 2018. On March 15, 2018, we paid dividends to stockholders totaling $154.0 million.