SEC Form 4

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	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	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* ALDRICH RICHARD (Last) (First) (Middle) 1365 MAIN STREET (Street) WALTHAM MA 02451 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol PTC THERAPEUTICS, INC. [ PTCT ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 03/07/2013
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
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	06/25/2013		C		583,333	A	(1)	583,333	I	See Footnote(2)
Common Stock	06/25/2013		P		466,667	A	$15	1,050,000	I	See Footnote(2)
Common Stock	06/25/2013		P		300,000	A	$15	300,000	I	See Footnote(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
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 Four Senior Preferred Stock	(1)	03/07/2013		P		583,333		(1)	(1)	Common stock	583,333	$12	583,333	I	See Footnote(2)
Stock Option (right to buy)	$10.85	05/15/2013		P		20,000		(4)	05/15/2023	Common stock	20,000	$10.85	20,000	D
Series Four Senior Preferred Stock	(1)	06/25/2013		C			583,333	(1)	(1)	Common stock	583,333	(1)	0	I	See Footnote(2)

Explanation of Responses:

1. Each share of Series Four Senior Preferred Stock converted automatically into one share of Common Stock upon the closing of PTC Therapeutics, Inc.'s initial public offering without payment of further consideration. The Series Four Senior Preferred Stock had no expiration date.

2. Shares held by Longwood Fund LP. The managing members of Longwood Fund LP, including Mr. Aldrich, share voting and investment power with respect to such shares. Mr. Aldrich disclaims beneficial ownership of the shares held by Longwood Fund LP except to the extent of any pecuniary interest therein.

3. Shares held by RA Capital Biotech Fund LP. The managing members of RA Capital Biotech Fund LP, including Mr. Aldrich, share voting and investment power with respect to such shares. Mr. Aldrich disclaims beneficial ownership of the shares held by RA Capital Biotech Fund LP except to the extent of any pecuniary interest therein.

4. This option was granted on May 15, 2013 and vests over three years, with 8.33% of the shares underlying the option vesting on August 15, 2013 and an additional 8.33% of the original number of shares underlying the option vesting at the end of each successive three-month period thereafter.

	/s/ Mark E. Boulding, attorney-in-fact	06/27/2013
	** 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).
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