Alleghany Corp De (Y) SEC Filing 10-K Annual report for the fiscal year ending Monday, December 31, 2012

Exhibit 99.1

ALLEGHANY CORPORATION

7 Times Square Tower, 17^th Floor

New York, NY 10036

ALLEGHANY CORPORATION REPORTS 2012 RESULTS:

STOCKHOLDERS’ EQUITY PER COMMON SHARE

INCREASES 10.8% SINCE 2011 YEAR-END

NEW YORK, NY, February 21, 2013 – Alleghany Corporation (NYSE-Y) reported stockholders’ equity per common share of $379.13 as of December 31, 2012, an increase of 10.8% from stockholders’ equity per common share of $342.12 at 2011 year-end.

Stockholders’ equity per common share as of December 31, 2012 reflects 8,360,959 shares issued in connection with the merger between Alleghany and Transatlantic Holdings, Inc. (“TransRe”), which closed on March 6, 2012. Alleghany’s results for 2012 include TransRe’s operations subsequent to the closing date.

Results for the 2012 fourth quarter include an after-tax underwriting loss, net of reinsurance and reinstatement premiums, of $267.8 million from Super Storm Sandy. In addition, fourth quarter after-tax investment income was reduced by $8.6 million as a result of Sandy losses at Alleghany’s Homesite Group Incorporated investment.

Our recorded loss for Sandy is based on an analysis of reported claims, an underwriting review of in-force contracts, estimates of losses resulting from wind, flood and other perils, and other factors requiring considerable judgment. Our ultimate loss from Sandy may be materially different from the current estimate due to the broad size and complexity of the event and the preliminary nature of the available information.

Results for the fourth quarter and full year include: