| FORM 4 | UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940 |
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| Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). | |||||||||||||||||
1. Name and Address of Reporting Person*
(Street)
| 2. Issuer Name and Ticker or Trading Symbol Dimension Therapeutics, Inc. [ DMTX ] | 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)
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| 3. Date of Earliest Transaction (Month/Day/Year) 10/27/2015 | ||||||||||||||||||||||||||
| 4. If Amendment, Date of Original Filed (Month/Day/Year) | 6. Individual or Joint/Group Filing (Check Applicable Line)
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| Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned | ||||||||||
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| 1. Title of Security (Instr. 3) | 2. Transaction Date (Month/Day/Year) | 2A. Deemed Execution Date, if any (Month/Day/Year) | 3. Transaction Code (Instr. 8) | 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) | 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) | 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) | 7. Nature of Indirect Beneficial Ownership (Instr. 4) | |||
| Code | V | Amount | (A) or (D) | Price | ||||||
| Common Stock | 10/27/2015 | C | 3,250,085 | A | (1) | 3,250,085 | I | See Footnotes(3)(4) | ||
| Common Stock | 10/27/2015 | C | 1,947,613 | A | (2) | 5,197,698 | I | See Footnotes(3)(4) | ||
| Common Stock | 10/27/2015 | P | 200,000 | A | $13 | 5,397,698 | I | See Footnotes(3)(4) | ||
| Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) | |||||||||||||||
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| 1. Title of Derivative Security (Instr. 3) | 2. Conversion or Exercise Price of Derivative Security | 3. Transaction Date (Month/Day/Year) | 3A. Deemed Execution Date, if any (Month/Day/Year) | 4. Transaction Code (Instr. 8) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) | 6. Date Exercisable and Expiration Date (Month/Day/Year) | 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) | 8. Price of Derivative Security (Instr. 5) | 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) | 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) | 11. Nature of Indirect Beneficial Ownership (Instr. 4) | ||||
| Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | ||||||||
| Series A Preferred Stock | (1) | 10/27/2015 | C | 9,500,000 | (1) | (1) | Common Stock | 3,250,085 | (1) | 0 | I | See Footnotes(3)(4) | |||
| Series B Preferred Stock | (2) | 10/27/2015 | C | 5,692,874 | (2) | (2) | Common Stock | 1,947,613 | (2) | 0 | I | See Footnotes(3)(4) | |||
1. Name and Address of Reporting Person*
(Street)
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1. Name and Address of Reporting Person*
(Street)
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1. Name and Address of Reporting Person*
(Street)
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| Explanation of Responses: |
| 1. 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. |
| 2. 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. |
| 3. 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, and 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. |
| 4. This report on Form 4 is jointly filed by GP V, Advisors, and Isaly. Each of the Reporting Persons 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. The Reporting Persons have designated a representative, currently Rishi Gupta, an employee of Advisors, to serve on the Issuer's board of directors. This report shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose. |
| /s/ Samuel D. Isaly | 10/29/2015 | |
| ** Signature of Reporting Person | Date | |
| Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. | ||
| * If the form is filed by more than one reporting person, see Instruction 4 (b)(v). | ||
| ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). | ||
| Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure. | ||
| Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number. | ||
