TECH-ENABLED ENGINEERING AND SOFTWARE PLATFORMFOR THE GLOBAL POWER AND PROCESS INDUSTRIES INVESTOR PRESENTATIONNYSE MKT: GVP

FORWARD LOOKING STATEMENTSAND NON-GAAP FINANCIAL MEASURES This presentation, our remarks, and answers to questions contain statements that are considered forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934. These statements reflect our current expectations concerning future events and results. We use words such as "expect," "intend," "believe," "may," "will," "should," "could," "anticipate," and similar expressions to identify forward-looking statements, but their absence does not mean a statement is not forward-looking. These statements are not guarantees of our future performance and are subject to risks, uncertainties, and other important factors that could cause our actual performance or achievements to be materially different from those we project. For a full discussion of these risks, uncertainties, and factors, we encourage you to read our documents on file with the Securities and Exchange Commission, including those set forth in our periodic reports under the forward-looking statements and risk factors sections. We do not intend to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.This presentation, our remarks, and answers to questions include references to adjusted EBITDA, adjusted net income, and adjusted earnings per share (“adjusted EPS”), which do not adhere to generally accepted accounting principles (“GAAP”). We define adjusted EBITDA as earnings before interest, taxes, depreciation and amortization (“EBITDA”) plus adjustments for consulting support for revenue recognition analysis, stock-based compensation expense, restructuring charges, gain/loss from the changes in fair value of contingent consideration, and write-down of capitalized software development costs. We define adjusted net income as net income plus adjustments for consulting support for revenue recognition analysis, stock-based compensation expense, restructuring charges, gain/loss from the changes in fair value of contingent consideration, and write-down of capitalized software development costs. We define adjusted EPS as adjusted net income divided by fully diluted shares of common stock issued and outstanding. EBITDA, Adjusted EBITDA, adjusted net income, and adjusted EPS are reconciled to net income, the most directly comparable GAAP measure, in the financial tables included in the Appendix to this presentation. We believe that this additional information and the reconciliation we provide may be useful to help evaluate our operations. This information supplements our results as reported in accordance with GAAP and should not be viewed in isolation from, or as a substitute for, our GAAP results.Unless otherwise indicated, all information set forth in this presentation is as of March 9, 2017, with the exception of certain market data presented on Slide 3. We undertake no duty to update or revise the information in light of new information, future events or otherwise, although we may do so from time to time as management believes is appropriate. Any such updating may be made through the filing of reports or documents with the Securities and Exchange Commission, through press releases or through other public disclosures. GSE SYSTEMS, INC. INVESTOR PRESENTATION // *

WHO IS GSE SYSTEMS? GSE SYSTEMS, INC. INVESTOR PRESENTATION // * We provide high-fidelity engineering and training simulators, software and training services to the power and process industries.We are one of the market leaders in the global nuclear and fossil power simulation industry.We provide nuclear facilities with specialized technical training instructors and expert consultants.Our solutions enhance employee and plant performance, reduce risk, and improve technical engineering and design.We have a track record of 40+ years serving a global, blue chip client base. Headquarters Sykesville, MD(Baltimore) Number of employees ~275 IPO date (NYSE MKT: GVP) 1995 Recent price (3/9/17) $3.10 Shares outstanding ~19M Market cap (3/9/17) $59M Total cash (12/31/16) ~$23M Total debt (12/31/16) $0M Enterprise value1 $36M Revenue (2016) $53M EV / Revenue1 0.7x 1 The Enterprise Value and EV/Revenue figures are estimates based on the Recent Price, Market Cap, Total Cash and Total Debt amounts as of the dates provided herein and do not represent the Enterprise Value or EV/Revenue as of the date of this presentation.

1976 1995 2011 2014 2015 GSE Predecessor, Link Simulation, Founded 2011 Fukushima 1950s First nuclear power plants developed 1979 and 1986 Three Mile Island and Chernobyl drive market growth Today and beyondAging workforce, growing global electricity demand, push for carbon-free energy, nuclear new-build momentum IPONYSE MKT: GVP Acquired Nuclear Training & Consulting Business - Hyperspring New ManagementLaunches Turnaround and Growth Strategy 2010 Acquired Engineering Consulting Business - TAS Engineering Acquired Process Software Business - EnVision Systems 40-YEAR HISTORY – FOUNDED IN 1976, REINVENTED IN 2015 GSE SYSTEMS, INC. INVESTOR PRESENTATION // *

GSE SYSTEMS, INC. INVESTOR PRESENTATION // * PROCESS POWER SERVING THE POWER & PROCESS INDUSTRIES NUCLEARWorld leader - significant installed baseAll major reactor typesExpert onsite training and consulting servicesFOSSILCoal; clean coal technologyNatural gas, including IGCCRENEWABLEHydro UPSTREAM OIL AND GASComputer-based tutorials and simulation of production and LNG systemsREFINING / PETROCHEMICALComputer-based tutorials and simulation of all major unit operationsSystem and control verificationAdvanced capabilities around concepts, designs and system interactions Reduce Risk * Increase Revenue * Lower Costs

REVENUE BREAKDOWN – ~$53M (2016) GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Performance Improvement Nuclear Training & Consulting By Segment By Industry Nuclear Fossil North America Europe By Geography Utilities Energy/Other OEMs By End-User Asia Process EngineeringServices EPCs Government

REPRESENTATIVE BLUE CHIP CUSTOMERS x GSE SYSTEMS, INC. INVESTOR PRESENTATION // * The trademarks above are the property of the referenced companies; GSE disclaims ownership of such marks. Inclusion of a representative customer herein is not intended to suggest endorsement or recommendation.

GSE SYSTEMS, INC. INVESTOR PRESENTATION // * BUSINESS MODEL – HOW WE MAKE MONEY ~60%30-40+%Engineering Modeling ServicesFixed price, and time and material contractsPercent complete ~35%10-15%Technical / High-Value StaffingTime and material contractsAs service is performed billing occurs <5%80-90%SoftwareSale of perpetual license with recurring MX, or SaaS annual subscriptionRatable recognition over life of MX agreement Simulation /Engineering Training Training/Simulation Software % of Revenue:Gross Margin:Primarily Selling:Business Model:Accounting:

INVESTMENT HIGHLIGHTS GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Expertise from 40+ years of serving clients in the power and process sectorsProven and differentiated technology for simulation and training solutionsDifficult-to-replicate technology and base of talented, specialized employees New leadership with an “owner/operator” mentalityAligned with shareholders through performance RSU program and stock ownershipImplemented significant Company-wide operational improvements Highly Specialized Technology Platform Global nuclear/fossil simulation market >$500M; US nuclear staffing market >$1BFavorable industry drivers: aging workforce crisis, rising demand for carbon-free electricity, and increasing international deployment of nuclear reactors Aligned Leadership Executing Turnaround 40+ years serving a high-barrier-to-entry market Strong, enduring relationships with blue chip power and process companies Large, Growing Addressable Markets Blue Chip Client Base Cash and equivalents of ~$23M $0 long-term debt 2016 Adjusted EBITDA of $4.6M Strong Financial Position Revitalizing core business growth; near-record backlog at the end of 2016 Evaluating new organic growth initiatives as well as selective, accretive acquisitions that are adjacent to and will enhance our core business Multi-PathGrowth Strategy

NEW GSE SENIOR LEADERSHIP GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Kyle Loudermilk – President & CEO20+ years of executive experience at publicly-listed MicroStrategy and AspenTech, and PE-backed Datatel/Ellucian (Thoma Bravo and Hellman & Freidman)Strong track record revitalizing technology companiesBS, MS, Chemical Engineering – Columbia UniversityHarvard University General Management ProgramChris Sorrells – COO20+ years of experience creating growth strategies for companies at the intersection of power/energy/technology12+ years investing experience as private equity professionalSalomon Smith Barney, Banc of America Securities, NGP Energy Technology PartnersBA – Washington & Lee University; M.Acc. – USC; MBA – College of William & MaryEmmett Pepe – CFO, CPA30+ years of experience in finance management across a variety of business sectors Focus on the software and telecommunications industriesExecutive positions at MicroStrategy, BroadSoft, Software AG, and webMethodsBS, Accounting – Penn State UniversityBahram Meyssami – CTO25 years of experience in the software industryFormer positions as Aspen Technology, Datatel, University of MarylandBS, MS, Ph.D Chemical Engineering – University of MarylandSean Fuller – SVP of Sales25 years of experience in the nuclear industry at General Electric and affiliated companiesFormer positions - Regional Vice President of Sales for Fuel and Services, Vice President Global Services Sales and COO of Global Nuclear Fuel AmericasBS, Mechanical – Nuclear Engineering from Worcester Polytechnic Institute; certified Six Sigma Black Belt August 2015 August 2015 July 2016 December 2015 March 2016

MANAGEMENT INCENTIVES ALIGNED WITHSHAREHOLDERS’ INTERESTS GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Since August 2015 management and Board have purchased ~300,000 shares, or ~1.5% of the Company Vast majority of equity compensation received by executives and key employees is structured in performance-restricted stock units (“PRSUs”) with the following vesting thresholds: GSE share price - 03/09/2017 % of total PRSUs that vest GSE 30-Day VWAP Threshold1 1VWAP = volume weighted average price of GSE common stock GSE share price - 08/24/2015

TURNAROUND PROGRESSINGACCORDING TO PLAN GSE SYSTEMS, INC. INVESTOR PRESENTATION // *   In progress

FINANCIAL AND OPERATING HIGHLIGHTS DEMONSTRATE TURNAROUND SUCCESS GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Backlog (in $M) Gross Margin (%)1 Adj. Net Income (in $M)3 +53% +610 basis points Adjusted EBITDA (in $M)2 1 2015 includes $1.5M write-down of capitalized software dev. costs 2,3 see GAAP to non-GAAP reconciliation in Appendix +231% Return to Profitability

PROVEN TECHNOLOGY / SERVICES GSE SYSTEMS, INC. INVESTOR PRESENTATION // * 459 Nuclear Fossil Oil & Gas, Petrochemical Full-Scope Simulator Installations1 Computer-Based Tutorials & Operator Training Simulators1 Tutorials Simulators 1,262 1 as of January 2016

HIGHLY EDUCATED, SPECIALIZEDEMPLOYEE BASE (~275) GSE SYSTEMS, INC. INVESTOR PRESENTATION // * BS/A MS/A PhD Employees By Degree1 Employees By Technical Focus Employees By Industry/Function Engineering Technical Training Software Development Nuclear Fossil 1 excludes Hyperspring and support staff Corporate Corp./Other Process

SIGNIFICANT MARKET OPPORTUNITY (IN MILLIONS) GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Global Nuclear / Fossil Simulation(~$500M market)1 US Nuclear Staffing / Training(~$1.2B market)1 1source: Company estimates based on various publicly available resources and proprietary research GSE Process Software Optimization (~$4.0B market)1 GSE GSE Performance Improvement Solutions Nuclear Training & Consulting EnVision Software

WHAT IS DRIVING MARKET DEMAND? Increasing demand for carbon-free electricity, such as nuclear powerRising deployment of nuclear reactors globally, with China leading the way Japan’s restart of nuclear reactors post-FukushimaInitiatives such as “Delivering the Nuclear Promise” Widening skills gap and aging workforce—a significant issue in the US power industry GSE SYSTEMS, INC. INVESTOR PRESENTATION // * 1source: NEI estimates per Power Engineering magazine, February 20152source: NEI, September 2015 “Nuclear energy is America’s top source of carbon-free electricity and avoids more than 1/2 billion tons of carbon emissions each year.”2 “39% of the nuclear workforce will be eligible for retirement by 2018, which means the industry must hire 20,000 new workers over the next four years to replace those retiring workers.”1 X

ROBUST NUCLEAR INDUSTRY BENEFITS GSE GSE SYSTEMS, INC. INVESTOR PRESENTATION // * 1source: World Nuclear Association, July 2016; 2,3 source: IEA-NEA, January 2016 TODAY NEAR TERM LONGER TERM Global nuclear reactor installed base1: 440 Ongoing fees for maintenance, re-hosting, retuning, model upgrades, training Nuclear reactors under construction2: 66 New nuclear capacity needed by 2050 to meet Harmony vision3: 1000 GW New simulator sales +Incremental fees for maintenance, re-hosting, retuning, model upgrades New simulator sales+Incremental fees for maintenance, re-hosting, retuning, model upgrades Nuclear Plants Under Construction by Country Operable Nuclear Reactors – Top 10 Countries Projected New Capacity (GW per Year) Required to Meet Harmony Targets3 GSE’s opportunity:

NUCLEAR ENERGY IS VITAL TO EPA’S CLEAN POWER PLAN1 Nuclear: top source of carbon-free electricity in U.S.Avoids >0.5 billion tons of CO2 each year.If nuclear plants close prematurely, EPA’s plan goals become difficult to reach; hence why New York state just passed $500 million per year in subsidies to keep their plants operating.Nuclear is the workhorse of a clean energy grid.Renewables can’t do it all. GSE SYSTEMS, INC. INVESTOR PRESENTATION // * 1source: NEI “5 Reasons Nuclear Energy Is Vital to EPA’s Clean Power Plan,” September 3, 2015

STRONG FINANCIAL POSITION ENABLES EXECUTION OF GROWTH STRATEGY GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Financial flexibility to grow the businessFocused on our defensible core power and process offerings Frame the total available market we currently and potentially can serveOrganic growth thesis: focus on our core and deliver what we have today Target owner-operators and EPCs with our current product and service offeringEngineering software for the power industry EnVision software for the process industry Focused on workforce development and training–think SuccessFactors for the process industryInorganic growth thesis: identify acquisitions that enhance the core business as natural adjacenciesComparable growth strategies: ANSYS (#ANSS) AspenTech (#AZPN) PTC (#PTC)

STRATEGY TO UTILIZE GSE AS AN ACQUISITION PLATFORM GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Understand the power and process vendor ecosystem – look for asymmetrical risk/reward acquisitionsAccumulated database of >150 potential targets, in two categories:softwaretechnical engineering, consulting, training and staffingPlan to be very disciplined, adhering to five main acquisition criteria:Immediate or near-term earnings accretion Strong target company fundamentals Good strategic fit, including capacity to leverage our global footprintHigh potential for cost and revenue synergies Ease of integration – business model, management, and culture

LONG-TERM OPERATING MODEL GOALS GSE SYSTEMS, INC. INVESTOR PRESENTATION // * 2016 Target Revenue Gross Margin R&D (% sales) SG&A (% sales)1 Adj. EBITDA (% sales) Maint. CAPEX (% sales) 1excludes stock-based compensation and change in fair value of contingent consideration

INVESTMENT CONCLUSIONS GSE SYSTEMS, INC. INVESTOR PRESENTATION // * GSE is a tech-enabled engineering and software company focused on the power and process industries Proven simulation and training technology with a highly-specialized employee base Large addressable markets supported by favorable industry drivers Enduring relationships with blue-chip clients developed over 40+ years Strong financial position, including ~$23M cash and $0 long term debt Strong leadership team aligned with shareholders, turning around operations and defining a new growth plan Pursuing attractive organic growth initiatives + complimentary, accretive acquisitions

GSE SYSTEMS, INC. INVESTOR PRESENTATION // * TECH-ENABLED ENGINEERING AND SOFTWARE PLATFORMFOR THE GLOBAL POWER AND PROCESS INDUSTRIES Q&A

GSE SYSTEMS, INC. INVESTOR PRESENTATION // * APPENDIX

EMERGING ADVANCED NUCLEAR REACTOR INDUSTRY GSE SYSTEMS, INC. INVESTOR PRESENTATION // * source: ThirdWay (http://www.thirdway.org/)

FINANCIAL HISTORY GSE SYSTEMS, INC. INVESTOR PRESENTATION // * 1In prior years, the Company recognized revenue on multiple element arrangements which included sales of its EnVision software product as delivery occurred on each element except post contract support ("PCS"). PCS revenue was recognized ratably over the PCS term. During the fourth quarter of 2015, management determined that that Company had not established vendor specific objective evidence ("VSOE") of the fair value for any of the elements in multiple element transactions including sales of its EnVision software licenses. Accordingly, the consolidated financial statements have been revised to recognize all revenue on multiple element transactions including EnVision software license sales ratably over the PCS terms on these transactions since VSOE did not exist for any of the non-software elements in these multiple element transactions. The revision to revenue resulted in a decrease to revenue and an increase in operating loss of $587,000 for the year ended December 31, 2014. The revision also had the effect of increasing billings in excess by $1.2 million, decreasing unbilled receivables by $62,000, increasing prepaid expenses and other current assets by $291,000 and increasing the accumulated deficit by $415,000 at December 31, 2014 as a result of the cumulative adjustment for prior periods. Financial Summary1 Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended 3 Months Ended 3 Months Ended (in $ millions, except shares amounts) 2013 2014 2015 2016 Dec. 30, 2015 Dec. 30, 2016 Revenue 47.6 37.5 56.8 53.1 14.3 13.3 Gross Profit 10.4 10.8 12.9 15.2 4.6 4.3 Gross margin 22% 29% 23% 29% 32% 33% Operating (loss) income -10.7 -7.5 -4.1 1.6 1.2 0.7 Operating margin -22% -20% -7% 3% 2% 5% Net (loss) income -10.5 -7.3 -4.7 1.4 1.0 1.0 Diluted EPS ($0.58) ($0.41) ($0.26) $0.08 $0.06 $0.05 Diluted shares 18,150,915 17,887,859 17,892,891 18,512,266 17,902,489 19,073,513 EBITDA -9.7 -6.6 -3.3 2.4 1.5 1.2 Adjusted EBITDA -2.0 -4.4 1.4 4.6 1.8 2.1 Adjusted net (loss) income -2.8 -5.1 0.0 3.6 1.3 1.9 Adjusted EPS – diluted ($0.15) ($0.29) $0.00 $0.20 $0.07 $0.10 Balance Sheet (in $ millions) Dec. 31, 2016 Cash and cash equivalents 22.9 Current assets 43.8 Total assets 53.6 Current liabilities 31.7 Long-term debt - Total stockholders' equity 21.1

EBITDA AND ADJUSTED EBITDA RECONCILIATION (IN $ THOUSANDS) GSE SYSTEMS, INC. INVESTOR PRESENTATION // * EBITDA and Adjusted EBITDA are not measures of financial performance under generally accepted accounting principles ("GAAP"). Management believes EBITDA and Adjusted EBITDA, in addition to other GAAP measures, provide meaningful supplemental information regarding our operational performance. Our management uses EBITDA, Adjusted EBITDA, and other non-GAAP measures to evaluate the performance of our business and make certain operating decisions (e.g., budgeting, planning, employee compensation and resource allocation). This information facilitates management's internal comparisons to our historical operating results as well as to the operating results of our competitors. Since management finds these measures to be useful, we believe that our investors can benefit by evaluating both non-GAAP and GAAP results. Investors should recognize that EBITDA and Adjusted EBITDA might not be comparable to similarly-titled measures of other companies. These measures should be considered in addition to, and not as a substitute for or superior to, any measure of performance prepared in accordance with GAAP. A reconciliation of non-GAAP EBITDA and Adjusted EBITDA to the most directly comparable GAAP measure in accordance with SEC Regulation G follows: Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended 3 Months Ended 3 Months Ended 3 Months Ended Adjusted EBITDA Summary 2013 2014 2015 2016 Dec. 31, 2015 Dec. 31, 2016 Net income (loss) (10,511) (7,329) (4,705) 1,422 1,026 1,003 Interest income, net (105) (143) (88) (85) (21) (33) Provision for income taxes 147 166 471 350 260 75 Depreciation and amortization 777 738 987 672 234 160 EBITDA (9,692) (6,568) (3,335) 2,359 1,499 1,205 Write-down of capitalized software development costs 2,174 - 1,538 - - - Goodwill impairment loss 4,462 - - - - - Gain/Loss from the change is fair value of contigent consideration 254 229 849 (207) 110 163 Restructuring charges - 1,264 1,791 490 45 3 Stock-based compensation expense 809 712 541 1,550 149 650 Consulting support for finance restructuring - - - 394 - 84 Adjusted EBITDA (1,993) (4,363) 1,384 4,586 1,803 2,105

ADJUSTED NET INCOME AND ADJUSTED EPS RECONCILIATION (IN $ THOUSANDS, EXCEPT SHARE AMOUNTS) GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Adjusted Net Income and adjusted earnings (loss) per share (“adjusted EPS”) are not measures of financial performance under generally accepted accounting principles (“GAAP”). Management believes adjusted net income and adjusted EPS, in addition to other GAAP measures, provide meaningful supplemental information regarding our operational performance. Our management uses Adjusted Net Income and other non-GAAP measures to evaluate the performance of our business and make certain operating decisions (e.g., budgeting, planning, employee compensation and resource allocation). This information facilitates management's internal comparisons to our historical operating results as well as to the operating results of our competitors. Since management finds these measures to be useful, we believe that our investors can benefit by evaluating both non-GAAP and GAAP results. Investors should recognize that Adjusted Net Income and Adjusted EPS might not be comparable to similarly-titled measures of other companies. These measures should be considered in addition to, and not as a substitute for or superior to, any measure of performance prepared in accordance with GAAP. A reconciliation of non-GAAP adjusted net income and adjusted EPS to GAAP net income, the most directly comparable GAAP financial measure, is as follows: Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended Fiscal Year Ended 3 Months Ended 3 Months Ended 3 Months Ended Adjusted Net Income (Loss) Summary 2013 2014 2015 2016 Dec. 31, 2015 Dec. 31, 2016 Net income (loss) (10,511) (7,329) (4,705) 1,422 1,026 1,003 Gain/loss from the change in fair value of contingent consideration 254 229 849 (207) 110 163 Write-down of capitalized software development costs 2,174 - 1,538 - - - Goodwill impairment loss 4,462 - - - - - Restructuring charges - 1,264 1,791 490 45 3 Stock-based compensation expense 809 712 541 1,550 149 650 Consulting support for finance restructuring - - - 394 - 84 Adjusted net income (loss) (2,812) (5,124) 14 3,649 1,330 1,903 Earnings (loss) per share – diluted (0.58) (0.41) (0.26) 0.08 0.06 0.05 Adjusted earnings (loss) per share – diluted (0.15) (0.29) 0.00 0.20 0.07 0.10 Weighted average shares outstanding – diluted 18,150,915 17,887,859 17,892,891 18,512,266 17,902,489 19,073,513

CONTACTS GSE SYSTEMS, INC. INVESTOR PRESENTATION // * Kalle Ahl (212) 836-9614kahl@equityny.comDevin Sullivan(212) 836-9608dsullivan@equityny.com Kyle Loudermilk, CEO(410) 970-7800kyle.loudermilk@gses.comChris Sorrells, COO(410) 970-7802chris.sorrells@gses.com