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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1463729	Receptos Inc.	RCPT	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1222012	Noubar Afeyan	One Memorial Drive, 7Th Floor Cambridge MA 02142	No	No	Yes	No
1255927	Jr M Edwin Kania	One Memorial Drive, 7Th Floor Cambridge MA 02142	No	No	Yes	No
1508052	Flagship Ventures Fund 2007, L.p.	One Memorial Drive, 7Th Floor Cambridge MA 02142	No	No	Yes	No
1508053	Flagship Ventures 2007 General Partner Llc	One Memorial Drive, 7Th Floor Cambridge MA 02142	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
Common Stock	Acquisiton	2013-05-14	1,152,039	$5.25	1,266,324	No	4	C	Direct
Common Stock	Acquisiton	2013-05-14	550,873	$7.73	1,817,197	No	4	C	Direct
Common Stock	Acquisiton	2013-05-14	107,142	$14.00	1,924,339	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	C	Direct
No	4	C	Direct
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Preferred Stock	Disposition	2013-05-14	8,640,289	$0.00	1,152,039	$5.25
Common Stock	Series B Preferred Stock	Disposition	2013-05-14	4,131,552	$0.00	550,873	$7.73

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Direct
0			No	4	C	Direct

Footnotes

The Series A preferred stock and Series B preferred stock converted upon the closing of the Issuer's initial public offering at a conversion ratio of 1 share of common stock for every 7.5 shares of Series A preferred stock and Series B preferred stock, for no additional consideration.
Beneficial ownership consists of: (i) 221,427 shares of common stock held by Flagship Ventures Fund 2007, L.P. ("Flagship Fund"); and (ii) an aggregate of 1,702,912 shares of common stock issued upon conversion of shares of Series A preferred stock and Series B preferred stock held by Flagship Fund. The general partner of Flagship Fund is Flagship Ventures 2007 General Partner LLC ("Flagship GP"), and the managing members of Flagship GP are Noubar B. Afeyan and Edwin M. Kania, Jr. The General Partner and Messrs. Afeyan and Kania have voting and investment control over the shares held by Flagship Fund and may be deemed to be the beneficial owners of such shares and each of them disclaims beneficial ownership of the shares except to the extent of his or its pecuniary interest therein.