Exhibit 99.1

Photronics, Inc.Global Leader in the Merchant Photomask Industry 21st Annual Needham Growth ConferenceJanuary 16, 2019

Safe Harbor Statement 2 This presentation and some of our comments may contain projections or other forward-looking statements regarding future events, our future financial performance, and/or the future performance of the industry. These statements are predictions, and contain risks and uncertainties. Actual events or results may differ materially from those presented. These statements include words like “anticipate”, “believe”, “estimate”, “expect”, “forecast”, “may”, “should”, “plan”, “project” or the negative thereto. We cannot guarantee the accuracy of any forecasts or estimates, and we are not obligated to update any forward-looking statements if our expectations change. If you would like more information on the risks involved in forward-looking statements, please see the documents we file from time to time with the Securities and Exchange Commission, specifically our most recent Form 10K and Form 10Q.Non-GAAP Financial MeasuresThis presentation and some of our comments may reference non-GAAP financial measures. These non-GAAP financial measures exclude certain income or expense items, and are consistent with another way management internally analyzes our results of operations. Non-GAAP information should be considered to be a supplement to, and not a substitute for, financial statements prepared in accordance with GAAP. Please see the “Reconciliation of GAAP to Non-GAAP Financial Information” in this presentation.

Global leader in merchant photomask industryDelivering growth by leveraging core competencies: Operational Excellence, Low Cost Producer, Technology Leadership, Customer IntimacyInvesting aggressively to exploit secular growth opportunitiesChina industry expansion – Made in China 2025Technology inflection from LCD to AMOLEDExplosion of G10.5+ panel capacityOn track for 2020 target: $630M revenue & $0.80 EPSStrategic investments bring top-line growthOperating leverage creates margin expansionShare repurchase reverses dilutionAdditional upside from potential M&A A Compelling Investment Thesis 3

Largest merchant photomask manufacturerUnmatched global footprintInvesting to exploit market disruptions with reciprocal customer commitments Strong balance sheet to fund growth Photronics at a Glance 4

Photomasks are Critical to Electronic Manufacturing 5 ComponentDesign End User Manufacturing Process Photomask

Cost controlSupply chain optimization Low Cost Producer Flexible deliveryHigh yields Operational Excellence Trusted partnerWafer yield enhancement Customer Intimacy Process know-howAdvanced PoR Technology Leader Core Competencies Underpin Sustainable Growth 6

Repositioned the CompanyChinaTotal TAM ~$700M by 2022Region with strongest growth potentialSupported by new manufacturing facilities in 2019IC CaptiveApproximately $2.4B TAMWe are seen as trusted partnerCommitments strengthen sustainabilityHigh-end revenue growthHigh value and high growthSupports China & captive initiatives Delivering on Growth Commitments 7 +131% +85% +42%

Technology as a Tool to Support Business Growth 8 High-End39% Mainstream61% High-End64% Mainstream36% Growth Investment Cycle

Repositioning the companyImproving high-end revenue China investmentsFPD technology inflections Strategic photomask partnershipsAdjacent market M&A Driving Sustainable, Profitable Growth 9 Short term (6-12 months) Medium term (12-36 months) Long term (36+ months) Implemented Ongoing Future

We already have growing business in China19% of total revenue in 201813% of IC revenue39% of FPD revenueGrowing strong since 2015IC +51% CAGRFPD +67% CAGRManufacturing presence in China aims to accelerate growthCustomer contracts will help quickly ramp facilitiesInvestment incentives reduce risk and improve returnsIC JV enables us to compete more effectively Developing and Growing China Business 10 +57% CAGR

IC FPD Location Xiamen Hefei Investment Amount $160M $160M Cleanroom Size ~2,500 m2 ~4,500 m2 Ownership Structure Majority-owned (50.01%) JV Wholly-owned Technology High-end, mainstream, logic, memory Up to G10.5+, AMOLED Production Start First half of 2019 First half of 2019 Incremental Revenue $150M (total for both operations) Investing in China Operations 11 PLAB well positioned for these investmentsGlobal merchant market and technology leaderStrong footprint in AsiaBalance sheet to support investment Customer commitments totaling ~$300M over next three yearsEnables Hefei facility to operate profitablyEnables Xiamen facility to achieve breakeven

Reducing Risk of China Investment 12

Mobile devices moving from LCD to AMOLEDSuperior visual characteristicsLower power consumptionEnables flexible formatPreferred for VR/AR devicesIncreases mask complexityMore mask layers per setTighter specs on each layerExtending technology leadership with P-800 in KoreaOnly firm with this advanced mask writerProduces highest resolution AMOLED masksCompetitive advantage vs. all merchants and captives Leveraging Technology Leadership for Mobile Display AMOLED Adoption 13 Source: Internal Estimates AMOLED remains preferred technology for mobile applications

65” 65” 65” 65” 65” 65” 65” 65” 95% G10.5+  Improved Glass Efficiency for Ultra-Large Screen TV 14 2940 mm x 3370 mm 2200 mm x 2500 mm 1950 mm x 2250 mm 1500 mm x 1850 mm 75” 75” 75” 75” 75” 75” 94% 65” 65” 65” 64% 75” 75” 73% 65” 65” 88%

China represents fastest growing display region64 fabs in production, under construction or being plannedLargest display producer (Korea 2nd)Photomask opportunities in China are attractiveWide range of display technology, including AMOLED & G10.5+No merchant photomask producer with high-end experienceNo G10.5+ photomask producer “Made in China 2025” Driving Growth in FPD Market 15 +17% CAGR Source: Internal Estimates G10.5+ CAGR +62%

64 China Display Fabs in Production by 2022 16 Image from https://commons.wikimedia.org/wiki/File:China-equirect.png LCD (7)AMOLED (15)G10.5+ (7) Photronics LocationsFPD KoreaFPD HefeiFPD Taiwan LCD (25)AMOLED (9)G10.5+ (1) New (29) Existing (35)

China represents fastest growing semiconductor regionGrowing domestic producersInvestments by multi-nationalsMore investment needed to meet national targets2022 forecast is 17%China government target is 40% by 2020, 70% by 2025Photomask opportunities in China are attractiveWide range of nodes in logic and memoryNo strong domestic merchant mask producer “Made in China 2025” Driving Growth in IC Market 17

23 New China 12” IC Fabs 18 Image from https://commons.wikimedia.org/wiki/File:China-equirect.png Photronics LocationsIC KoreaIC XiamenIC TaiwanIC Boise (not shown) Logic (17)Memory (6) Innotron (M) Nexchip (L) YMTC (M) Samsung (M) AOS (L) Unigroup (L) GF (L) SMIC (L) Intel (M) SMIC (L) Cansemi (L) JHICC (M) USC (L) Silan (L) Sien IC (L) HidM (L) AMS (L) TSMC (L) HH Group (L) Unigroup (M) SMIC (L) SMIC (L) HLIC (L)

Top line growth combined with continued focus on driving costs outDisciplined focus on investments to improve ROICMaintain strong balance sheet while returning cash to shareholdersLaunched two buy-back programs in FY18Financial stability through economic downturnFlexibility to invest in other growth opportunities (organic or M&A) Strategic Priorities to Improve Shareholder Value 19

Powerful operating leverage: target 50%Strong operating cash flow generatorPositive free cash flow every fiscal year since 2009Solid balance sheet Solid Financial Fundamentals 20

Key Success Factors“Made in China 2025” – new facilitiesFPD technology inflectionsRepositioning the companyNode migration (logic & memory)Growing business with captive producersIC JV’s in China and TaiwanStable mainstream businessCross-site collaboration to serve global customers On Our Way to 2020 Target 21

Fund organic growthGeographic expansion into ChinaTechnical investments to maintain leadership positionExplore strategic M&APhotomask industry – IC & FPDAdjacencies to increase revenue diversificationDebt repaymentConverts mature in April 2019Established $75M loan agreements in ChinaShare repurchase Repurchased $23M of $45M net authorization in 2018Reduced outstanding shares by 2.6M Clear Capital Deployment Priorities 22 *Net cash defined as cash and cash equivalents less long-term borrowings (including current portion)

Clear path to accelerate profitable growthPrudent stewardship of balance sheetFinancial model to grow income faster than revenueOn track to achieve financial targetsRevenue $630M & EPS $0.80 by 2020Operating margin > 15%Minimum $100M net cashImprove ROIC – no projects accepted below hurdle rate Financial Summary 23

Thank you for your interest! For Additional Information:R. Troy Dewar, CFAVice President, Investor Relations203.740.5610tdewar@photronics.com