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

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(Print or Type Responses)

1. Name and Address of Reporting Person * KOUNINIS EFSTATHIOS A   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) VP of Finance & CAO (Last) (First) (Middle) C/O PEGASYSTEMS INC., 1 ROGERS STREET 3. Date of Earliest Transaction (Month/Day/Year) 03/04/2019 (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 03/04/2019   M   309 (1) A $ 0 993 D   Common Stock 03/04/2019   F   89 D $ 66.32 904 D   Common Stock 03/04/2019   M   171 (2) A $ 0 1,075 D   Common Stock 03/04/2019   F   49 D $ 66.32 1,026 D   Common Stock 03/05/2019   M   890 (3) A $ 0 1,916 D   Common Stock 03/05/2019   F   259 D $ 64.84 1,657 D   Common Stock 03/05/2019   M   511 (4) A $ 0 2,168 D   Common Stock 03/05/2019   F   151 D $ 64.84 2,017 (5) D

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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

Restricted Stock Units (6)

$ 0

03/04/2019

M

309 (1)

03/02/2016

(7)

Common Stock

309

$ 0

1,239

D

Restricted Stock Units (6)

$ 0

03/04/2019

M

171 (2)

03/02/2018

(7)

Common Stock

171

$ 0

2,046

D

Restricted Stock Units (6)

$ 0

03/05/2019

M

890 (3)

03/05/2019

(7)

Common Stock

890

$ 0

0

D

Restricted Stock Units (6)

$ 0

03/05/2019

M

511 (4)

03/05/2019

(7)

Common Stock

511

$ 0

2,047

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KOUNINIS EFSTATHIOS A C/O PEGASYSTEMS INC. 1 ROGERS STREET CAMBRIDGE, MA 02142			VP of Finance & CAO

Signatures

/s/ Janet Mesrobian, Esq., Attorney-In-Fact for Efstathios Kouninis		03/06/2019
**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 5% vesting on March 2, 2019, with a release date of March 4, 2019, the first business day following the vesting. The original grant was 6,192 restricted stock units, with 20% vesting on March 2, 2016, and the remaining 80% vesting in equal quarterly installments over the remaining 4 years.
(2)	Represents 5% vesting on March 2, 2019, with a release date of March 4, 2019, the first business day following the vesting. The original grant was 3,410 restricted stock units, with 20% vesting on March 2, 2018 and the remaining 80% vesting in equal quarterly installments over the remaining 4 years.
(3)	Represents 100% vesting on March 5, 2019. The original grant was 890 restricted stock units, which were granted on March 5, 2018. As part of the Company's 2018 Corporate Incentive Plan (CICP), Mr. Kouninis elected to receive his annual bonus in RSUs.
(4)	Represents 20% vesting on March 5, 2019. The original grant was 2,558 restricted stock units, with the remaining 80% vesting in equal quarterly installments over the remaining 4 years.
(5)	Does not include shares of common stock subject to unvested restricted stock units and/or options awards.
(6)	Each restricted stock unit represents the right to receive, following vesting, one share of the issuer's common stock.
(7)	Once vested, the shares of common stock are not subject to expiration.

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