FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person *   Mitford Kathleen 2. Date of Event Requiring Statement (Month/Day/Year) 03/08/2018 3. Issuer Name and Ticker or Trading Symbol PTC INC. [PTC] (Last) (First) (Middle) 140 KENDRICK STREET 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) EVP, Products 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) NEEDHAM, MA 02494 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 5,746 D   Common Stock 3,330 I Spouse

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	  (2)	  (2)	Common Stock	1,843	$ 0 (1)	D	Â
Restricted Stock Units	  (3)	  (3)	Common Stock	4,918	$ 0 (1)	D	Â
Restricted Stock Units	  (4)	  (4)	Common Stock	3,911	$ 0 (1)	D	Â
Restricted Stock Units	  (5)	  (5)	Common Stock	3,911	$ 0 (1)	D	Â
Restricted Stock Units	  (6)	  (6)	Common Stock	15,383	$ 0 (1)	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mitford Kathleen 140 KENDRICK STREET NEEDHAM, MA 02494	Â	Â	  EVP, Products	Â

Signatures

/s/Catherine Gorecki by power of attorney filed 3/9/2018		03/09/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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).
(1)	Each restricted stock unit represents a contingent right to receive one share of PTC Inc. common stock.
(2)	Time-based restricted stock units granted November 2, 2015 that vest as to 1,843 RSUs on November 15, 2018.
(3)	Time-based restricted stock units granted on October 31, 2016 that vest as to 2,459 RSUs on each of November 15, 2018 and November 15, 2019.
(4)	Time-based restricted stock units granted on November 15, 2017 that vest in three substantially equal installments on each of November 15, 2018, November 15, 2019 and November 15, 2020.
(5)	Aspirational performance-based RSUs granted on November 15, 2017 that can only be earned to the extent the established performance criteria are met for the performance period ending September 30, 2018. Any RSUs earned will vest in three substantially equal installments on November 15, 2018, 2019 and 2020.
(6)	Time-based restricted stock units granted on March 7, 2018 that vest in three substantially equal installments on March 15, 2019, 2020 and 2021.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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