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Filing Details

Accession Number:: 0001104659-15-074205
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2015-10-29 18:14:31
Reporting Period:: 2015-10-27

Filing Date:: 2015-10-29
Accepted Time:: 2015-10-29 18:14:31
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1592288	Dimension Therapeutics Inc.	DMTX	Biological Products, (No Disgnostic Substances) (2836)	463942159

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1537370	Rishi Gupta	C/O Dimension Therapeutics, Inc. 840 Memorial Drive, 4Th Floor Cambridge MA 02139		Yes	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2015-10-27	3,250,085	$0.00	3,250,085	No	4	C	Indirect	See Footnotes
Common Stock	Acquisiton	2015-10-27	1,947,613	$0.00	5,197,698	No	4	C	Indirect	See Footnotes
Common Stock	Acquisiton	2015-10-27	200,000	$13.00	5,397,698	No	4	P	Indirect	See Footnotes

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

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Preferred Stock	Disposition	2015-10-27	9,500,000	$0.00	3,250,085	$0.00
Common Stock	Series B Preferred Stock	Disposition	2015-10-27	5,692,874	$0.00	1,947,613	$0.00

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

Footnotes

The Series A Preferred Stock automatically converted into Common Stock, for no additional consideration, on a 2.923-for-1 basis at the closing of the Issuer's initial public offering, and had no expiration date.
The Series B Preferred Stock automatically converted into Common Stock, for no additional consideration, on a 2.923-for-1 basis at the closing of the Issuer's initial public offering, and had no expiration date.
These securities are held of record by OrbiMed Private Investments V, LP ("OPI V"). OrbiMed Capital GP V LLC ("GP V") is the sole general partner of OPI V. OrbiMed Advisors LLC ("Advisors") is the managing member of GP V. Samuel D. Isaly ("Isaly"), a natural person, is the managing member of and owner of a controlling interest in Advisors. By virtue of such relationships, GP V, Advisors and Isaly may be deemed to have voting and investment power over the securities held by OPI V and as a result may be deemed to have beneficial ownership over such securities. The Reporting Person is an employee of Advisors.
Each of GP V, Advisors, Isaly, and the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any such entity or person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose.