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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1301106	National Interstate Corp	NATL	Fire, Marine & Casualty Insurance (6331)	341607394

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1566289	J Anthony Mercurio	3250 Interstate Drive Richfield OH 44286	Executive Vp & Coo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Shares ($0.01 Par Value)	Acquisiton	2015-11-11	1,613	$20.41	33,116	No	4	M	Direct
Common Shares ($0.01 Par Value)	Disposition	2015-11-11	1,613	$27.47	31,503	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Shares ($0.01 Par Value)	Option (Right to Buy)	Disposition	2015-11-11	1,613	$0.00	1,613	$20.41

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
5,940	2007-01-01	2016-02-08	No	4	M	Direct

Footnotes

The price reported represents a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.40 to $27.50. The reporting person undertakes to provide to National Interstate Corporation ("NATL"), any security holder of NATL, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.
Options vested 20% per year each January 1, beginning January 1, 2007.