Sec Form 4 Filing - Pepe Emmett Anthony @ GSE SYSTEMS INC - 2022-12-31

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 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 Pepe Emmett Anthony 2. Issuer Name and Ticker or Trading Symbol GSE SYSTEMS INC [ GVP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) 6940 COLUMBIA GATEWAY DRIVE, SUITE 470 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2022 (Street) COLUMBIA, MD21046 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 12/31/2022 F 6,003( 1 ) D $ 0.72 392,049 D Common Stock 12/31/2022 M 12,500 A 404,549 D Common Stock 12/31/2022 F 3,763( 3 ) D $ 0.72 400,786 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Performance Rights ( 2 )( 3 ) 12/31/2022 M 12,500 ( 3 ) 01/01/2026 Common Stock 12,500 ( 3 ) 150,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Pepe Emmett Anthony 6940 COLUMBIA GATEWAY DRIVE SUITE 470 COLUMBIA, MD21046 Chief Financial Officer Signatures /s/ Emmett Pepe 01/04/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Shares withheld by the Issuer for payment of applicable taxes owed due to the vesting of 19,940 restricted share units pursuant to two restricted share unit agreements between the Reporting Person and the Issuer. ( 2 )Each performance right (PR) is a contingent right to receive one share of Issuer Common Stock. PRs vest upon satisfaction of a Service Condition (SC) and a Stock Price Performance Condition (SPPC). The SC is satisfied for sixteen dates (3/31/2022, 6/30/2022, 9/30/2022, 12/31/2022, 3/31/2023, 6/30/2023, 9/30/2023, 12/31/2023, 3/31/2024, 6/30/2024, 9/30/2024, 12/31/2024, 3/31/2025, 6/30/2025, 9/30/2025, and 12/31/2025) if the Issuer has continuously employed the reporting person through that SC date, and 12,500 PRs then will be eligible to vest if the SPPC also has been met. The SPPC requires the Volume Weighted Average Price of the Issuer's Common Stock as quoted on NASDAQ to be at least $1.94 measured over a 20 consecutive trading day period. Once the SPPC is met, PRs that remain unvested shall vest upon satisfaction of each future SC. ( 3 )On June 14, 2022, the Compensation Committee of the Board of Directors of the Issuer certified that the SPPC applicable to these PRs had been satisfied. Accordingly, on December 31, 2022, the SC was satisfied with respect to 12/31/2022, resulting in the vesting of 12,500 PRs and the issuance of 12,500 shares of Common Stock, of which 3,763 shares of Common Stock were withheld by the Issuer for payment of applicable taxes owed due to the vesting of the 12,500 PRs as provided by a restricted share unit agreement between the Reporting Person and the Issuer.

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).

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