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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1551693	Sientra Inc.	SIEN	Orthopedic, Prosthetic & Surgical Appliances & Supplies (3842)	205551000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1397144	Llp Abingworth	38 Jermyn Street London X0 SW1Y 6DN		No	No	Yes	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	2014-10-29	495,000	$15.00	2,199,012	No	4	P	Indirect	See Notes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Notes

Footnotes

These shares were purchased in connection with the Issuer's initial public offering of Common Stock.
Consists of (i) 247,500 shares held of record by Abingworth Bioventures V LP, or ABV V, and (ii) 247,500 shares held of record by Abingworth Bioventures V Co-Invest Growth Equity Fund LP, or AGE. ABV V and AGE are collectively referred to as the "Abingworth Funds." The investment manager of the Abingworth Funds is Abingworth LLP, or Abingworth. Abingworth Bioventures V GP LP, or Abingworth GP, a Scottish limited partnership, serves as the general partner of each of the Abingworth Funds.
Abingworth General Partner V LLP, a Scottish limited liability partnership, serves as the general partner of Abingworth GP. Abingworth GP (acting by its general partner Abingworth General Partner V LLP) has delegated to Abingworth all investment and dispositive power over the shares held by the Abingworth Funds. The reporting person holds the reported securities indirectly through the Abingworth Funds.
The reporting person disclaims beneficial ownership of such shares, except to the extent of its pecuniary interest therein. This report shall not be deemed an admission that the reporting person, the Abingworth Funds or any other person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.