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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1274792	Merrimack Pharmaceuticals Inc	MACK	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1094201	L Gary Crocker	C/O Merrimack Pharmaceuticals, Inc. One Kendall Square, Suite B7201 Cambridge MA 02139		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	Explanation
Common Stock	Acquisiton	2014-05-05	10,000	$6.69	2,738,271	No	4	P	Indirect	By Wife
Common Stock	Acquisiton	2014-05-05	35,000	$1.25	2,773,271	No	4	M	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Wife
No	4	M	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2014-05-05	35,000	$0.00	35,000	$1.25

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2014-08-30	No	4	M	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.51 to $6.87, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within such range.
This option is fully vested.