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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
775368	Alleghany Corp	Y	Fire, Marine & Casualty Insurance (6331)	510283071

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1038397	S Thomas Johnson	C/O Alleghany Corporation 7 Times Square Tower, 17Th Floor New York NY 10036		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2010-04-26	250	$0.00	3,271	No	4	A	Direct
Common Stock	Acquisiton	2010-04-27	1,219	$137.46	4,490	No	4	M	Direct
Common Stock	Disposition	2010-04-27	100	$297.00	4,390	No	4	S	Direct
Common Stock	Disposition	2010-04-27	100	$296.80	4,290	No	4	S	Direct
Common Stock	Disposition	2010-04-27	1	$296.77	4,289	No	4	S	Direct
Common Stock	Disposition	2010-04-27	8	$296.76	4,281	No	4	S	Direct
Common Stock	Disposition	2010-04-27	510	$296.75	3,771	No	4	S	Direct
Common Stock	Disposition	2010-04-27	100	$296.71	3,671	No	4	S	Direct
Common Stock	Disposition	2010-04-27	100	$296.70	3,571	No	4	S	Direct
Common Stock	Disposition	2010-04-27	100	$293.46	3,471	No	4	S	Direct
Common Stock	Disposition	2010-04-27	200	$293.40	3,271	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	A	Direct
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Option (right to buy)	Acquisiton	2010-04-26	1	$0.00	500	$300.72
Common Stock	Option (right to buy)	Disposition	2010-04-27	1	$0.00	1,219	$137.46

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
11		2020-04-25	No	4	A	Direct
10		2010-04-30	No	4	M	Direct

Footnotes

Grant of restricted stock for no cash consideration under 2010 Directors' Stock Plan
Includes shares of Common Stock paid by Alleghany Corporation as a stock dividend on April 23, 2010 to stockholders of record on April 1, 2010.
One-third of such option becomes exercisable on each of the first, second and third anniversaries of the date of grant. The option was granted for no cash consideration.
One-third of such option became exercise on each of the first, second and third anniversaries of the date of grant. The option was granted for no cash consideration.