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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
1345709	E Sarah Nash	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	Disposition	2014-04-17	36,698	$0.00	940,296	No	5	G	Indirect	By Trust
Common Stock	Acquisiton	2014-05-07	15,000	$6.79	955,296	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	5	G	Indirect	By Trust
No	4	P	Direct

Footnotes

The reporting person was previously a trustee of a grantor retained annuity trust. All shares of the issuer held by such trust were previously reported as beneficially owned by the reporting person on a Form 3 filed on 2/1/12. The reported transaction represents the termination of such trust and the distribution of a portion of the shares held by such trust to beneficiaries not reportable by the reporting person. The remaining 27,750 shares held by such trust were distributed to the reporting person and continue to be reported in this Form 4 as directly owned.
The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.74 to $6.81, 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.