FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * KRA DOUGLAS I   2. Issuer Name and Ticker or Trading Symbol PEGASYSTEMS INC [PEGA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP, Global Customer Success (Last) (First) (Middle) C/O PEGASYSTEMS INC., 1 ROGERS STREET 3. Date of Earliest Transaction (Month/Day/Year) 09/01/2017 (Street) CAMBRIDGE, MA 02142 4. If Amendment, Date 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 (City) (State) (Zip) 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 09/01/2017   M   1,524 A $ 0 24,817 D   Common Stock 09/01/2017   F   801 (1) D $ 57.7 24,016 D   Common Stock 09/01/2017   S   723 (2) D $ 57.49 (3) 23,293 D   Common Stock 09/01/2017   M   978 A $ 0 24,271 D   Common Stock 09/01/2017   F   514 (1) D $ 57.7 23,757 D   Common Stock 09/01/2017   S   464 (2) D $ 57.49 (3) 23,293 D   Common Stock 09/05/2017   M   557 (4) A $ 0 23,850 D   Common Stock 09/05/2017   F   263 D $ 57.65 23,587 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	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 control number.		SEC 1474 (9-02)

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 Underlying Securities (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 of Derivative Security: 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

Stock Options

$ 6

09/01/2017

M

1,524

12/13/2008(5)

12/13/2017

Common Stock

32,000

$ 0

4,568

D

Stock Options

$ 5.94

09/01/2017

M

978

12/11/2009(6)

12/11/2018

Common Stock

11,740

$ 0

2,934

D

Restricted Stock Units (7)

$ 0

09/05/2017

M

557 (4)

03/02/2016

(8)

Common Stock

11,145

$ 0

5,573

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KRA DOUGLAS I C/O PEGASYSTEMS INC. 1 ROGERS STREET CAMBRIDGE, MA 02142			SVP, Global Customer Success

Signatures

/s/ Janet Mesrobian, Esq., Attorney-In-Fact for Douglas Kra		09/06/2017
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Represents the exercise price of the Stock Options referenced in Table II and Mr. Kra's tax liability, which were paid by way of withholding by the Company of shares of equal value.
(2)	Sold pursuant to a pre-arranged stock trading plan under rule 10b5-1 of the Securities Exchange Act of 1934, as amended.
(3)	Represents the weighted average of the sale prices on September 1, 2017, ranging from $57.15 to $57.70.
(4)	Represents 5% vesting on September 2, 2017, with a release date of September 5, 2017, the first business day following the vesting. The original grant was 11,145 restricted stock units, with 20% vesting on March 2, 2016, and the remaining 80% vesting in equal quarterly installments over the remaining 4 years.
(5)	Options vested 20% on December 13, 2008, with the remaining 80% vesting in equal quarterly installments over the next four years.
(6)	Options vested 20% on December 11, 2009, with the remaining 80% vesting in equal quarterly installments over the next four years.
(7)	Each restricted stock unit represents the right to receive, following vesting, one share of Pegasystems Inc.'s common stock.
(8)	Once vested, the shares of common stock are not subject to expiration.

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

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.