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Filing Details

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
1601264	Michael Dybbs	C/O New Leaf Venture Partners 7 Times Square, Suite 3502 New York NY 10036		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	2015-10-27	1,097,745	$0.00	1,097,745	No	4	C	Indirect	See Footnote
Common Stock	Acquisiton	2015-10-27	961,538	$13.00	2,059,283	No	4	P	Indirect	See Footnote

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Preferred Stock	Disposition	2015-10-27	3,208,711	$0.00	1,097,745	$0.00

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

Footnotes

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 by New Leaf Ventures III, L.P. ("NLV-III") and New Leaf Growth Fund I, L.P. ("NLGF"). New Leaf Venture Associates III, L.P. ("NLVA-III") is the general partner of NLV-III and New Leaf Venture Management III, L.L.C. ("NLVM-III") is the general partner of NLVA-III. New Leaf Growth Associates I, L.P. ("NLGA") is the general partner of NLGF and NLVM-III is the general partner of NLGA. Reporting Person is employed by New Leaf Venture Partners, L.L.C., which is affiliated with the above entities and disclaims beneficial ownership of the shares held by NLV-III and NLGF except to the extent of his pecuniary interests therein if any.