2026 Investor Day May 14 | New York City

Welcome andOpening Remarks VP, Investor Relations David Kelley

Disclaimers Important Information About Littelfuse, Inc. This presentation does not constitute or form part of, and should not be construed as, an offer or solicitation to purchase or sell securities of Littelfuse, Inc. and no investment decision should be made based upon the information provided herein. Littelfuse strongly urges you to review its filings with the Securities and Exchange Commission, which can be found at investor.littelfuse.com. This website also provides additional information about Littelfuse. The information on our website is not part of, and is not incorporated into, this presentation. “Safe Harbor” Statement Under the Private Securities Litigation Reform Act of 1995. These risks, uncertainties and other factors include, but are not limited to, risks and uncertainties relating to general economic conditions; product demand and market acceptance; economic conditions; the impact of competitive products and pricing; product quality problems or product recalls; capacity and supply difficulties or constraints; coal mining exposures reserves; cybersecurity matters; failure of an indemnification for environmental liability; changes in import and export duty and tariff rates; exchange rate fluctuations; commodity price fluctuations; the effect of the Company’s accounting policies; labor disputes and shortages; restructuring costs in excess of expectations; pension plan asset returns less than assumed; uncertainties related to political or regulatory changes; integration of acquisitions may not be achieved in a timely manner, or at all; limited realization of the expected benefits from investment and strategic plans; the risk that expected benefits, synergies and growth prospects of the Basler acquisition and/or potential future acquisitions may not be achieved in a timely manner, or at all; the risk that Basler’s business may not be successfully integrated with Littelfuse acquisition of Basler; the risk that the Company's investments in its serviceable addressable markets does not result in the projected growth or synergies; and other risks which may be detailed in the company’s Securities and Exchange Commission filings. Should one or more of these risks or uncertainties materialize or should the underlying assumptions prove incorrect, actual results and outcomes may differ materially from those indicated or implied in the forward-looking statements. This presentation should be read in conjunction with information provided in the financial statements appearing in the company’s Annual Report on Form 10-K for the year ended December 27, 2025. Further discussion of the risk factors of the company can be found under the caption “Risk Factors” in the company’s Annual Report on Form 10-K for the year ended December 27, 2025, and in other filings and submissions with the SEC, each of which are available free of charge on the company’s investor relations website at investor.littelfuse.com and on the SEC’s website at http://www.sec.gov. These forward-looking statements are made as of the date hereof. The company does not undertake any obligation to update, amend or clarify these forward-looking statements to reflect events or circumstances after the date hereof or to reflect the availability of new information. Non-GAAP Financial Measures. The information included in this presentation includes the non-GAAP financial measures of organic net sales growth, adjusted operating margin, adjusted EBITDA margin, adjusted diluted earnings per share, adjusted effective tax rate, free cash flow conversion, and consolidated net leverage ratio (as defined in the credit agreement). A reconciliation of these non-GAAP financial measures to the most directly comparable GAAP financial measures are set forth in the appendix. The company believes that these non-GAAP financial measures provide useful information to investors regarding its operational performance, ability to generate cash and its credit position enhancing an investor’s overall understanding of its core financial performance. The company believes that free cash flow is a useful measure of its ability to generate cash. The company believes that these non-GAAP financial measures are commonly used by financial analysts and provide useful information to analysts. Management uses these measures when assessing the performance of the business and for business planning purposes. Note that the definitions of these non-GAAP financial measures may differ from those terms as defined or used by other companies.

Who We Are Today: Littelfuse Snapshot (NASDAQ: LFUS) A Market Leader in Shaping Solutions for the Safe and Efficient Transfer of Electrical Energy 1927 Founded ~17,000 Total Employees $2.4B 2025 Revenue $499M 2025 EBITDA $366M 2025 FCF 1.0x Net Leverage COMPANY OVERVIEW 2025 REVENUE BY END MARKET Energy and Industrial Infrastructure (EII) Industrial Infrastructure Energy Infrastructure Computing, Communications & Diversified Industrials (CCDI) Data Center & Building Infrastructure Diversified Industrials Consumer Electronics Transportation & Logistics (T&L) Passenger Vehicle Commercial Vehicle End Market 9% 21% 7% 17% 9% 18% 19%

Today’s Agenda Moving the World Forward in Transportation & Logistics (T&L) Dave Ruppel | SVP & GM, T&L Market Accelerating Long-Term Growth through Semiconductor Innovation Karim Hamed | SVP & GM, Semiconductor Products Delivering More Resilient Growth and Scaling Operational Excellence to Drive Strong Shareholder ValueAbhi Khandelwal | EVP & CFO Closing Remarks: The Leader in Safe and Efficient Electrical Energy Transfer Greg Henderson | President & CEO Welcome and Opening Remarks David Kelley | VP, Investor Relations Shaping the Future of Global Electrification Greg Henderson | President & CEO Building a Brighter Global Future through Energy & Industrial Infrastructure (EII) Peter Kim | SVP & GM, EII Market Strengthening Our Leadership Position in Computing, Communications, and Diversified Industrials (CCDI) Deepak Nayar | SVP & GM, CCDI Market BREAK 10:00 AM Q&A SESSION 11:15 AM LEADERSHIP LUNCHEON 12:00 PM 9:00 AM 10:15 AM

President & CEO Greg Henderson Shaping the Future of Global Electrification

Differentiated and Timely Opportunity to Capitalize onGlobal Electrification Megatrend Computing, Communications & Diversified Industrials (CCDI) Energy & IndustrialInfrastructure (EII) Transportation & Logistics(T&L) GLOBAL ELECTRICITY DEMAND IS ACCELERATING 36,000 TWh by 2030 Driven by a Growing Need Across Our End Markets | 50% “DC Native” Demand by 2030 vs. 25% Today1 1 Company estimate.

We Are the Enablers – From Milliwatts to Megawatts HIGHER CURRENT HIGHER VOLTAGE HV Data Center Rack LV Data Center Rack Grid Transmission Substation Passenger Vehicle Electrification Solar Power Generation BESSContainer GlucoseMonitor Material Handling CommercialSpace Commercial HVAC USB-CProtection E-Bike Medium- & High-Voltage Industrial Drives SmartMeter Commercial Vehicle Electrification Providing Safe and Efficient Transfer of Electrical Energy Across the Power Spectrum Computing, Communications & Diversified Industrials (CCDI) Energy & IndustrialInfrastructure (EII) Transportation & Logistics(T&L)

Overvoltage BROAD-BASED TECHNOLOGY EXPERTISE Value Proposition – Delivering a Complete Set of Solutions toSolve Customers’ Complex Challenges Protects against too much voltage, suppressing surges and spikes Unrivaled Ability to Provide Protection Across Electrical Ecosystem at a Global Scale Advanced Protection & Power Solutions Provides smart, integrated control by detecting, responding, and managing faults in real time Power Semis to Protective Relays MOVs to Semiconductor Protection Overcurrent Protects against too much current, stopping overheating and damage Fuses to Circuit Breakers

Poised to Capitalize on Accelerating End-Market Growth LITTELFUSE SAM IS GROWING MID-SINGLE DIGITS $22B SAM1 $30B SAM1 2025 2030 POSITIONING US FOR ACCELERATING GROWTH $4.5B Revenue $1.1B Adj. EBITDA Our 2030 Ambition Energy and Industrial Infrastructure Market (EII) Transportation & Logistics Market (T&L) Computing, Communications & Diversified Industrials Market (CCDI) 1 Company estimate.

Evolution of Our Long-Term Strategic Priorities SharpenedFocus on Growth Opportunities Partneringwith Market Leaders Enhancing Operational Excellence

Sharpened Focus onThree Key High-Growth Opportunities (HGOs) HIGH-GROWTH OPPORTUNITIES Growing +Double-Digits CAGR Energy and Industrial Infrastructure Market (EII) Grid & Utility Infrastructure Computing, Communications & Diversified Industrials Market (CCDI) Data Center Aerospace & Defense End Market Above-Market Driven by Capabilities and Go-To-Market CORE GROWTHGrowing Mid-Single-Digits CAGR Overcurrent Overvoltage Advanced Protection & Power Solutions SHARPENED FOCUS

Our Strategic Approach to M&A Strengthen Solutions Capabilities Expand solutions for customers’ next-gen architectures Enhance technology leadership positioning in safe and efficient electrical energy transfer Bolster partnerships with market leaders FOCUS ON ACCELERATING HIGH-GROWTH OPPORTUNITIES Enhance Market Exposure Amplify exposure to HGOs: Grid & Utility Infrastructure, Data Center, and A&D Expand to adjacent market or regional opportunities Drive addressable market expansion and diversification SHARPENED FOCUS

New Market-Oriented Sales Structure Enhances Partnerships Optimized Go-to-Market Approach Drives Greater Intentionality Around Cross-Sell Opportunities CUSTOMER SEGMENTATION FUELING GROWTH ENABLERS ~2/3 of Revenue: Direct Customer Partnership Strategic Partnership Focused on Solving Complex Problems to Drive Innovation Global Leading and Emerging Customers ~1/3 of Revenue: Served via Distribution Channel Partnerships (Over 100,000 Customers) with a Long Tail and Strong Profitability Broad Market Customers PARTNERING WITH MARKET LEADERS

Go-to-Market Strategy In-Action 2020 – 2025 ExampleGlobal EV and Clean Energy Leader Littelfuse Solutions Are in Every Product for This Customer 2025 – 2030 OpportunityData Center HGO Significant Content Opportunity with Market Leaders Scaling Our Go-To-Market Strategy Across Our Marketsto Unlock Significant Profitable Growth >20% CAGR(2020 – 2025) +2x 2025 Design Wins PARTNERING WITH MARKET LEADERS

Scaling Operational Excellence Across Our Organization Elevating Our Operational Mindset Driving Portfolio and Footprint Optimization SQDCI = Safety, Quality, Delivery, Cost, Inventory. Scaling Business and AI Processes Leveraging best practices Programmatic SQDCI initiatives Deploying global operating model Sharpened customer focus Continuous portfolio rationalization Footprint optimization Scalable resource allocation AI-enabled productivity enhancements Enhanced acquisition execution OPERATIONAL EXCELLENCE

Right Strategy to Capitalize on Our Opportunities Unparalleled Capabilities to Enable Transformation and Enhance Growth Transformational Shift in Electrification of Our Markets Why We Are Excited for the Future Driving Value for Stakeholders

Building a Brighter GlobalFuture through Energy and Industrial Infrastructure (EII) SVP & GM, EII Market Peter Kim

Key Messages Capturing accelerating global demand for energy expansion, electrification, and industrial infrastructure through differentiated, mission-critical solutions 1 Enabling the modernization of industrial markets through safe, reliable, and efficient high-power systems 2 Positioned as a systems solution partner by expanding integrated technologies for leading global customers 3

Energy & Industrial Infrastructure Market Snapshot KEY HIGHLIGHTS EII END MARKETS AS A % OF TOTAL 2025 REVENUE1 EXAMPLES OF MARKET-LEADING CUSTOMERS 1 Pro-forma inclusive of Basler. ~$600M1 2025 EII Revenue Expanding Global Customer Base Leading: 43% • Emerging: 24% • Broad: 33% (% of 2025 EII Revenue) Industrial Infrastructure Industrial Automation Mining, Oil & Gas Commercial Construction Building Infrastructure Energy Infrastructure Grid & Utility Battery Energy Storage Systems (BESS) Renewables 9% 21% 7% 17% 9% 18% 19%

2025 2030 Positioned to Grow Significantly Above Market Leading EII market growth drivers Grid & Utility Infrastructure Battery Energy Storage Systems Data Center Infrastructure Renewables 1 Company estimate. Serviceable Addressable Market1 ~6%Market Growth Rate1(2025 – 2030) +Double DigitsLFUS Growth Rate1 (2025 – 2030)

Our Right to Win – EII Sustainable Competitive Advantages Increased focus with leading OEM customers supported by strong channel partnerships Solution selling with opportunity to expand system-level partnerships Complex, customized innovation driven by market-leading engineering and technology capabilities Deep solution-level collaboration with market leading customers Product Performance Best-in-class, high-power products enable leading prevention measures, performance, quality, and reliability for our customers’ applications OEM Relationships TailoredSolutions

Capitalizing on Our Growth Opportunities 23 INVESTOR DAY 2026 Energy Infrastructure Industrial Infrastructure

Industrial InfrastructureCapitalizing on Long-Term Growth and Modernization Trusted Partner Powering the Next Generation of Industrial Systems ~2x CAPITAL SPEND IN INDUSTRIAL ELECTRIFICATION IN THE NEXT 5 YEARS Key Drivers of Market Growth Our Opportunity System-level solutions enabled through broad technology offering Reduced customer design complexity through application-tailored sub-systems Deep technical expertise supported by global engineering teams and laboratories Electrification of Industrial Systems Increased Adoption of Smarter and Connected Solutions Improving Energy Efficiency and Sustainability 1 1 Company estimate.

Customer Success StoryLeading Solutions for Next Generation of Industrialization RESULTS OUR UNIQUE SOLUTION BACKGROUND As automation systems advance, industrial OEMs face rising demand for power stability, efficiency, and safety – driving need for reliable systems and sustained uptime High-performance power semiconductors improve system reliability and efficiency Fast-acting fuses enable system protection, maximizing uptime Intelligent protective relays ensure safety and scalable operations Customer Value Littelfuse Value Increase Asset Reliability by 25% Minimize Energy Losses and Improve System Efficiency by +3% System SolutionsDrive 2x Opportunity Solution is ScalableAcross Industrial Markets

Energy InfrastructureCapitalizing on Significant Grid & Utility Infrastructure Investment Well-Positioned to Enable Accelerating Grid & Utility Infrastructure Evolution +$3T ESTIMATED GRIDINVESTMENT THROUGH 2030 Key Drivers of Market Growth Rapidly Expanding Electricity Demand Modernization of Aged Infrastructure Rising Need for Grid Flexibility Our Opportunity Higher power requires more innovative solutions Our leading technology capabilities strengthen grid resilience Basler acquisition enhances our differentiated system- level capabilities 1 1 Company estimate. High Growth Opportunity

Customer Success StoryComprehensive Protection and Switching for BESS Architecture RESULTS OUR UNIQUE SOLUTION BACKGROUND As BESS system scaled to higher power levels, an integrator faced challenges ensuring end-to-end protection and safe, reliable grid connectivity Coordinated, high-voltage DC fuses enable seamless system-wide protection Integrated power semiconductor solutions drive more efficient switching architecture Basler protection relays enhance intelligent power monitoring, designed to promote longer uptime Customer Value Littelfuse Value High Growth Opportunity Reduce Unplanned Downtime by 40% System-SafetyArchitecture Drives Faster Utility Integration Application Engineering Expertise to be Trusted Partner of Choice Protection Solutions Become Standard Reference for New Designs

Capturing accelerating global demand for energy expansion, electrification, and industrial infrastructure through differentiated, mission-critical solutions 1 Enabling the modernization of industrial markets through safe, reliable, and efficient high-power systems 2 Positioned as a systems solution partner by expanding integrated technologies for leading global customers 3 Key Takeaways 28 INVESTOR DAY 2026

Deepak Nayar SVP & GM, CCDI Market Strengthening Our Leadership Position in Computing, Communications, and Diversified Industrials (CCDI)

Key Messages Capitalizing on megatrends in electrification, driven by outsized growth from Data Centers and Aerospace & Defense 1 Delivering differentiated, high-value solutions to solve more complex customer challenges 2 Expanding go-to-market model with increased emphasis on growing with our key customers as they shift to new technology platforms 3

Computing, Communications, and Diversified Industrials Market Snapshot KEY HIGHLIGHTS CCDI END MARKETS AS A % OF TOTAL 2025 REVENUE Data Center & Building Infrastructure Data Center Building & Industrial Controls Diversified Industrials Aerospace & Defense Medical Broad Distribution Reach Consumer Electronics Consumer Electronics Appliances EXAMPLES OF MARKET-LEADING CUSTOMERS ~$1,100M 2025 CCDI Revenue Extensive Global Customer Base Leading: 33% • Emerging: 33% • Broad: 34% (% of 2025 CCDI Revenue) 9% 21% 7% 17% 9% 18% 19%

2025 2030 Data Center Diversified Industrials Positioned to Grow in Attractive Addressable Market 1 Company estimate. Leading ccdi market growth drivers Serviceable Addressable Market1 ~8%Market Growth Rate1(2025 – 2030) +Double DigitsLFUS Growth Rate1 (2025 – 2030)

Our Right to Win – CCDI Sustainable Competitive Advantages Leadership position in passives and protection with complementary high-voltage semiconductor capabilities Ability to win with portfolio breadth as our complementary products enable a more complete customer solution and competitive advantage Alignment with customers in product development at the engineering level to co-create solutions for next-gen architectures Go-to-market model shift to better serve customers with full solution set Engineering expertise to solve complex protection challenges in data center, aerospace & defense and diversified industrials Proven track record of delivering market-leading and reliable technologies to meet customer needs ProductPortfolio Customer Collaboration Technology Differentiation

Capitalizing on Our Growth Opportunities Data Center Diversified Industrials 34 INVESTOR DAY 2026

Data CenterMarket-Leading Protection from Grid to Chip Server / Storage / Networking F Power Distribution Unit (PDU) Remote Power Panel (RPP) Rack PDU IT load / IT gear power-only Sidecar (1 MW+) G PSU shelf HVDC bus (±400 / 800 VDC) DC PDU Low Voltage Switchgear Automatic Transfer Switch (ATS) Motor Control Center (MCC) Power-factor correction Harmonic filtering Medium Voltage Switchgear Main power distribution Feeder / branch MV / LV transformer Backup Power / Generator Engine system Fuel and exhaust system Control and monitoring Cooling and lubrication Onsite Power Battery energy storage system Renewable energy Thermal Management I HVAC systems Liquid cooling Immersion cooling UPS H High-power battery systems Power Factor Correction (PFC) High wattage power supplies Power Distribution Units (PDUs) Power Busway / Cable E Feeder / riser busway Busways Tap-off boxes Monitoring and sensing Gray Space: Power to the Building White Space: Power Inside the Building D C A B A B D C H H E F I I G High Growth Opportunity

Data CenterHigher Power Demands Accelerate Growth Opportunity $6T DATA CENTER INFRASTRUCTURE INVESTMENT(2025 – 2030)1 >15% CAGR DATA CENTERPOWER USAGE(2025 – 2030)1 …Leading to High-Voltage Opportunities for Littelfuse Capabilities across the power spectrum with system-level understanding of customers’ needs Leading high-voltage protection partner to customers across the data center ecosystem 2x – 4x Content Upliftas market transitions to high-voltage architectures 25% – 30%+ CAGR Estimated data center revenue growth through 2030 Significant Data Center Infrastructure Investment …and Increased Power Usage Driving High-Voltage Architecture Expertise in High Voltage Protection Creates Unique Right to Win 1 Company estimate. High Growth Opportunity

Customer Success StoryProviding Data Center Solutions from Grid to Chip RESULTS OUR UNIQUE SOLUTION BACKGROUND Leading hyperscaler requires more advanced and comprehensive protection solutions as their architecture evolves from low to high voltage Enabled various eco-system partners on infrastructure, rack, and board level solutions Utilized our full portfolio of capabilities including passives, protection, power, and high-voltage industrial fuses Brought value through reliability, performance, systems level support, and agency insights Leveraged current partnership to co-create future solutions to enable continued architecture evolution Customer Value Littelfuse Value Enabling Best-in-Class Performance, Reliability, and Safety Sold 20+ LFUS Solutions Across Various Applications Anticipated Revenue +3x Over 5-Year Period High Growth Opportunity

Diversified IndustrialsTrusted Brand with Strong Franchise Value Market Leadership Driving Best-in-Class Growth and Profitability Trusted brand and technology solution provider for the safe and efficient transfer of electrical energy Direct sales to accelerate growth in key focus areas including Aerospace & Defense and Medical Leveraging key, longstanding distribution partnerships to service diverse, broad base of customers Market leader serving >50,000 end customers Highly profitable franchise with strong cash contribution

Diversified Industrials – Aerospace & Defense (A&D)Capitalizing on Significant A&D Growth Opportunity +15% ESTIMATED AEROSPACE & DEFENSE SAM CAGR (2025 – 2030) Key Drivers of Market Growth Increasing Defense Budget Commercialization of Space Air Travel Recovery Significant Opportunity to Expand Market Share through Targeted Investments 1 Company estimate. 1 Our Opportunity Long history ofmission-critical technology capabilities Leveraging ongoing market evolution Higher voltageand power Focused key account management + targeted inorganic expansion High Growth Opportunity

Customer Success StoryMission-Critical Solutions for Commercial Space Innovator RESULTS OUR UNIQUE SOLUTION BACKGROUND Leading commercial space customer has evolved beyond traditional rocket manufacturer into a fully integrated space infrastructure platform operating across A&D market Established preferred supplier status through initial engagement in circuit protection Leveraged protection, power semiconductors, and electromechanical technology capabilities to expand share Strengthened position as strategic, multi-product solutions partner through customization Enabled recurring design wins with long product lifecycles Customer Value Littelfuse Value Solution Solved for High Reliability, High Voltage Power Complexity Timely Delivery of Optimized Protection and Power Solutions for Next-Gen Space Systems Expanded Revenue +5x Over 5-Year Period Broadened ODM Design Partner Relationships to Enhance Market Opportunity High Growth Opportunity

Key Takeaways 41 Capitalizing on megatrends in electrification, driven by outsized growth from Data Centers and Aerospace & Defense 1 Delivering differentiated, high-value solutions to solve more complex customer challenges 2 Expanding go-to-market model with increased emphasis on our key customers to grow share in new technology platforms 3 INVESTOR DAY 2026

Break ~15 Minutes

Moving the WorldForward in Transportation and Logistics (T&L) SVP & GM, T&L Market David Ruppel

Key Messages Optimizing our go-to-market approach to be more effective, selective, and proactive with leading customers 1 Enhancing and diversifying our market position through early, deep, and technical partnerships with leading OEMs to drive above market growth 2 Sharpening focus on megatrends and operational excellence to enhance long-term profitable growth 3

Transportation & Logistics Market Snapshot KEY HIGHLIGHTS T&L END MARKETS AS A % OF TOTAL 2025 REVENUE Passenger Vehicle OEMs and Tier 1 Suppliers Global Exposure - North America, Europe, and China Commercial Vehicle HD and MD Trucking Material Handling, Construction and Ag Equipment Recreational Vehicles and Powersports Warehouse Automation and Robotics EXAMPLES OF MARKET-LEADING CUSTOMERS ~$700M 2025 T&L Revenue Optimizing T&L Customer Base Leading: 27% • Emerging: 40% • Broad: 33% (% of 2025 T&L Revenue) 9% 21% 7% 17% 9% 18% 19%

Positioned to Diversify and Grow in Expansive Addressable Market ~1%Global Vehicle Production Growth Rate1(2025 – 2030) +Mid-Single DigitsLFUS Growth Rate1 (2025 – 2030) 1 Company estimate. 2025 2030 Serviceable Addressable Market1

Our Right to Win – T&L Sustainable Competitive Advantages Long history of co-innovation with leading global Transportation customers Operational excellence mindset driving enhanced focus on commercial vehicle opportunities with market leading customers Comprehensive and market leading low-, medium-, and high-voltage capabilities to serve evolving customer needs System-level architecture approach to evolving applications such as BMS, battery disconnect, connectivity, and HMI Customizable and scalable solutions for multi-tech circuit protection and modular power distribution Global footprint and scale with best-in-class testing and local-for-local manufacturing Customer Partnerships Collaborative Innovation Scalable Portfolio

Capitalizing on Our Growth Opportunities Electrification and Functional Safety Trends Go-to-Market & Operational Mindset Optimization 48 INVESTOR DAY 2026

Unlocking Outgrowth Opportunities throughGlobal Electrification and Functional Safety Evolutions Background Est. +1% Global Production Rate1 Electrification Evolution: Global Transportation evolution continues despite slowing EV growth rates Functional Safety Adoption: Higher voltage, ADAS, and autonomous adoption make functional safety critical to ensuring system reliability Customers increasingly reliant on proven suppliers with comprehensive capabilities, flexible solutions, and global scale Comprehensive Solutions, Technical Expertise, and Global Scale to Enable Ongoing T&L Evolutions Our Opportunity Enabling electrification growth opportunities at scale through portfolio of market-leading 12V to medium- and high-voltage systems Leveraging deep customer relationships to co-develop and design next-gen solutions with industry-leading functional safety features Re-deploying engineering resources through operational mindset to focus on systems that support long-term growth and profitability enhancements +Mid-Single-Digits Outgrowth ADAS = Automated Driver Assistance System. 1 Company estimate.

Customer Success StorySolving for Safety Challenges with Global Automotive Leader Global automotive customer identified specific challenges across EV models: Battery safety Packaging Launch timing Designed and implemented differentiated multi-technology circuit protection modules Drove superior performance within customer packaging and timing constraints Provided ultra-fast circuit protection that enabled a differentiated, higher level of functional safety +20X Dollar Content / Unit Compared to Traditional ICE Design Opened Door to Further Tech Engagements Across Our Portfolio RESULTS OUR UNIQUE SOLUTION BACKGROUND Solved Electrificationand Functional Safety Challenges to Enable Accelerated Launch Customer Value Littelfuse Value

Optimization Mindset to Enhance Our Long-Term Profitable Growth Maximizing Returns and Driving Market Outperformance Pivoting Portfolio Toward Highest PotentialCustomers and Applications Sharpened Focus Right customers, applications, and opportunities Driving to Scale Opportunity funnel target shifted to driving more meaningful value with leading OEMs Reducing Complexity Redeploying resources for larger, scalable, and leverageable opportunities Low High Customer Volume and Revenue Potential Prioritizeand Grow Efficiency and Scale Reducing Complexity

Customer Success StoryDriving Significant Momentum with Commercial Vehicle Market Leader RESULTS OUR UNIQUE SOLUTION BACKGROUND Accelerated Platform Development and Launch Supply Chain Simplification and Inventory Reduction Architected an optimized system solution for an accessory control module Reduced development costs and time-to-market Leveraged CAN switching platform with Littelfuse multi-technology capabilities Leading commercial vehicle customer required scaled solution to growing complexity of multiple vehicle platforms and problems associated with configuring and powering connected accessories Customer Value Littelfuse Value Significant Potential Annual Revenue with Multi-Year Contribution +4x Content Opportunity Driving Further Scaled Opportunities CAN = Controller Area Network.

Key Takeaways 53 Optimizing our go-to-market approach to be more effective, selective, and proactive with leading customers 1 Enhancing and diversifying our market position through early, deep, and technical partnerships with leading OEMs to drive above market growth 2 Sharpening focus on megatrends and operational excellence to enhance long-term profitable growth 3 INVESTOR DAY 2026

Accelerating Long-Term Growth through Semiconductor Innovation SVP & GM, Semiconductor Products Dr. Karim Hamed

Key Messages Leveraging our well aligned Semiconductor products to enable growth across key focus end markets 1 Enhancing our portfolio by delivering solutions that complement Littelfuse’s broader technologies and capabilities 2 Driving long-term growth and profitability improvement through our Semiconductor products business 3

Overvoltage Protects against too much voltage, suppressing surgesand spikes Advanced Protection & Power Solutions Provides smart, integrated control by detecting, responding, and managing faults in real time High-Power Stacks and Full Protection Modules TVS and ESD Diodes Overcurrent Protects against too much current, stopping overheating and damage Solid State Protection and Power Modules for Breakers Semiconductor Products Business Snapshot 1 Semiconductor revenue is embedded within EII, CCDI, and T&L end markets. KEY ENABLER OF OUR GROWTH STRATEGY EXAMPLES OF MARKET-LEADING CUSTOMERS Serving 40,000+ Customers Across Our Network 2025 REVENUE BY PRODUCT Power 50% Protection 50% ~$670M1 Enhancing Growth Across Our End Markets EII While Strengthening Long-Term Positioning in HGOs CCDI T&L BROAD-BASED TECHNOLOGY EXPERTISE

Leveraging Technology Transitions in High-Growth Opportunities to Outpace Market Growth Large, Attractive SAM Capitalizing on High-Growth Opportunities Grid & Utility Infrastructure Data Center Diversified Industrials – Aerospace & Defense Protection + Power Semi Double-Digits % CAGR1 (2025 – 2030) ~$6B 20301 1 Company estimate.

New, Focused Semiconductor StrategyPositioned to Deliver Consistent, Profitable Growth Enabling Portfolio that Enhances Littelfuse Positioning Across End Markets PROTECTION Market leader poised for continued growth SAM expansion via innovation and new market penetration Strong profitability and cash flow POWER Focused strategy to deliver sustainable, long-term profitable growth Leveraging core competencies to drive growth in high-value applications Manufacturing optimization to be a key driver of profitability improvement DELIVERING LEADING SOLUTIONS ACROSS PROTECTION AND POWER +

Protection Semiconductors Maintaining and Expanding Leading Position through Innovation Accelerating the Next Phase of Growth and Margin Expansion 1 Company estimate (2025 – 2030 CAGR). Building on Strong Foundation Positioned as a market leader with a long track record of success Delivering >10% 5-year CAGR1 and margins above corporate average Looking Ahead: Key Priorities Expand core end market positions benefiting from secular growth trends Accelerate penetration in new end markets where we have a significant right-to-win Strategically deploy R&D to higher-value, higher-ASP solutions (5x – 10x)

Customer Success StorySolving High-Value Protection Challenges through Core Competencies RESULTS OUR UNIQUE PROTECTION PLATFORM CUSTOMER PROBLEM High-Power, Software Configurable,Solid-State Protection Module Scalable Across Growth End Markets HVDC enables higher system efficiency Risk of catastrophicarc flash events Requires reliable, advanced protection solutions with electronic reset capability Customer Value Littelfuse Value Integrates 5X Functions Reduces Cost of Ownership Higher Value Capture

Power SemiconductorsExecuting on a More Focused, Customer-Centric Strategy Driving Accelerating Long-Term Growth and Enhanced Profitability Pivoting Portfolio Toward High-Value Applications Target Outcomes Sharpening Our Growth Focus Focusing on areas where we have a strong right to win, market share, and an attractive SAM Rationalizing Our Portfolio Exiting areas of low value Optimizing Our Manufacturing Manufacturing to support a more focused product strategy in highest growth, high-power applications More reliable partner for our customers 1 Sustained long-term revenue growth 2 Meaningful margin expansion by 2030 3 Low High VALUE Investto Grow

Customer Success StorySolving High-Value Power Challenges through Core Competencies RESULTS OUR UNIQUE POWER PLATFORM CUSTOMER PROBLEM Deployed High-Power Stack with Integrated Cooling Architecture Seamless power transfer between UPS systems and backup power sources Provides compact, high-power-density design while maximizing system reliability STS = Static Transfer Switch. UPS = Uninterruptable Power Supply. Data centers require uninterrupted power toIT racks STS detects faults and instantly switches to backup power Requires a reliable andfast power solution to enable seamless switching Customer Value Littelfuse Value Differentiated Tech Solution +$400M Opportunity inHigh-Power Stacks Scalable Solution Across Broader Customer Network

Key Takeaways 63 INVESTOR DAY 2026 Leveraging our well aligned Semiconductor products to enable growth across key focus end markets 1 Enhancing our portfolio by delivering solutions that complement Littelfuse’s broader technologies and capabilities 2 Driving long-term growth and profitability improvement through our Semiconductor products business 3

EVP & CFO Abhi Khandelwal Delivering More Resilient Growth and Scaling Operational Excellence to Drive Strong Shareholder Value

Key Messages Enhancing organic growth opportunities in large and expanding markets, augmented by strategic acquisitions 1 Accelerating shareholder value creation through disciplined capital allocation 2 3 Delivering a more stable, less cyclical earnings profile and greater through-cycle resiliency 4 Elevating operational performance by combining a well-defined operational playbook with renewed operational rigor to drive improved profit margins

2025 Revenue Profile – Three Strong Segments Serving Diverse and Growing Set of End Markets Reporting Segment Product based segments serving diverse end markets Complementary capabilities enhanced by go-to-market shift Meaningful content and outgrowth opportunities across segments Broad exposure to end markets poised to benefit from secular electrification megatrend Diversification drives enhanced long-term growth stability Next-gen technology advancements across end markets 21% 9% 17% 18% Transportation Electronics Industrial Energy andIndustrialInfrastructure(EII) Computing,Communications& DiversifiedIndustrials (CCDI) Transportation & Logistics(T&L)

= +7% – 9% Organic Revenue CAGR Above-Market Core Growth Outsized HGO Growth 24% – 26%Adj. EBITDA Margin Scale and Leverage Operational Excellence, Product Rationalization +6% – 8%Inorganic Revenue CAGR Strategic M&A Supported by Strong Cash Generation >$25.00 EPSHigh-Teens EPS CAGR Best-in-Class Performance Mid-Teens ROIC Littelfuse Value Creation Playbook (2025 – 2030) A Stronger, More Resilient Growth and Profitability Story Organic Growth Margin Expansion Inorganic Growth Value Creation

Poised to Drive Sustainable Growth Driven by Organic Execution and Enhanced by Strategic M&A Core Growing Above-MarketAcross Segments Electronics Transportation Industrial HGOs Sharpened Focus on HGOs Across Markets EII: Grid & Utility Infrastructure CCDI: Data Center and Aerospace & Defense Strategic M&A Executing Strategic and Disciplined Acquisitions in Targeted Areas Expands solution capabilities and technology positioning Enhances market exposure and expands our serviceable addressable market +7% – 9%ORGANIC GROWTH +6% – 8%INORGANIC GROWTH HGOs = High-Growth Opportunities.

Leverage areas of best-in-class operating practices across global footprint Drive continuous portfolio rationalization to enhance long-term profitability Deploy capital to enhance productivity via AI and footprint optimization Our Focus on Operational Excellence Expected to Enhance Profitability as We Scale Deployed Operational and Financial Metrics to Measure and Drive Long-Term Enhancements TOP PRIORITIES EXECUTION HIGHLIGHTS AND OPPORTUNITIES Transportation segment initiatives driving structural margin enhancements Identified semiconductor rationalization opportunities to enhance long-term margin profile Leveraging AI to enhance productivity Acquisition execution a key focus point Basler exceeding expectations 1 2 3

Generating Strong FCF to Support Growth Maintaining 100%+ FCF conversion target (2021 – 2025 average FCF conversion: 100%+) A proven history of strong cash generation Focusing on driving long-term cash returns of strategic investments and M&A Delivering FCF enhancements through working capital improvements Positioned to Deliver $600M+ Annual FCF by 2030 HIGHLIGHTS See Appendix for reconciliation of non-GAAP figures.

Consistent, Strong Balance Sheet ManagementWhile Delivering Acquisitive Growth Flexible Capital Structure and History of Balance Sheet Consistency Capital Summary and Financial Highlights ($M, As of 3/28/2026) Cash & Cash Equivalents $482 Total Assets $3,856 Debt $635 Total Stockholders’ Equity $2,514 Consolidated Net Leverage Ratio 1.0x Available Credit Under Revolving Credit Facility $599 Net Debt to EBITDA Track Record of Maintaining Leverage withinTargeted Range While Driving M&A Model 2.5x 1.0x Target Long-Term Range

Disciplined and Balanced Capital Deployment Strategy FUTURE PRIORITIES Organic Investments Long-term revenue growth Enhanced productivity Targeting 3% – 4% CapEx as a % of Sales Strategic Acquisitions Strengthens technology positioning Enhances market exposure Return Capital to Shareholders Consistent dividend payout Opportunistic share repurchases 1 Company estimate.

Our Approach to Strategic M&A – Sharpened Focus on Enhanced Growth, Profitability, and Returns FINANCIAL FILTERS Enhances Long-Term Organic Growth (Targeted 7% – 9%) Expands Margins and Strengthens Long-Term Profitability Focuses on Cash Returns (Double-Digit ROIC) Strengthen Solution Capabilities Expand solutions for customers’ next-gen architectures Enhance technology leadership positioning in safe and efficient electrical energy transfer Bolster partnershipswith market leaders Enhance Market Exposure Amplify exposure to HGOs: Grid & Utility Infrastructure, Data Center, and A&D Expand to adjacent market or regional opportunities Drive addressable market expansion and diversification FOCUS ON ACCELERATING HIGH-GROWTH OPPORTUNITIES

HIGHLIGHTS AND UPDATE M&A Spotlight – Basler Acquisition Capital Deployed ~$350M 2026E Revenue Contribution $130M – $135M Strategic and Financial Rationale Bolsters Technology Differentiation Diversifies End Market Exposure Enhances Long-Term Organic Growth Expands Margins and Strengthens LT Profitability Focuses on Cash Returns Enhances high-growth industrial exposure Leverages longstanding customer relationships with market leaders Q1 performance exceeded expectations Drives strong 2026E financial impact to our portfolio Revenue: $130M – $135M Adj. EBITDA Margin: High-Teens Adj. EPS Accretion: $0.15+ Previous Est. Accretion: $0.10 – $0.15 Dec 2025

Our 2030 Ambition $4.5BRevenue $1.1B Adj. EBITDA $600M Free Cash Flow Note: Company estimates for 2030.

Annual Revenue Growth Bridge ($B) $2.4B +8% – 10% ~$4.5B Core market growth driven by content expansion across segments and go-to-market contribution HGOs led by Grid & Utility Infrastructure, Data Center, and Aerospace & Defense Product rationalization est. (-1% – 2%) annually Inorganic driven by strategic M&A focus Segment Organic Growth Assumptions: Electronics: High-Single Digits Transportation: Mid-Single Digits Industrial: Double Digits DRIVERS AND ASSUMPTIONS (-1% – 2%) +6% – 8% +7% – 9% Organic Note: see Appendix for reconciliation of non-GAAP figures. 1 Company estimate. 1

Adjusted EBITDA Bridge ($B)Based on Revenue Growth and Adj. EBITDA Margin Outlook Midpoints $X.x 30% – 35% Conversion ~$1.1B Core + HGO conversion in-line with historic levels (30% – 35%) Optimization to drive structural profitability enhancements; ~$50M identified Strategic M&A focused on driving double-digit ROIC Estimated margin expansion across Electronics, Transportation, and Industrial segments 2030 Target: 24% – 26% Adj. EBITDA Margin1 DRIVERS AND ASSUMPTIONS $0.5B ~$50M ~$200M ~$400M Note: see Appendix for reconciliation of non-GAAP figures. 1 Company estimate. 1

Enhancing organic growth opportunities in large and expanding markets, augmented by targeted acquisitions 1 Enhancing shareholder value creation through disciplined capital allocation 2 Elevating operational performance by combining a well-defined operational playbook with renewed operational rigor to drive improved profit margins 3 Delivering a more stable, less cyclical earnings profile and greater through-cycle resiliency 4 Key Takeaways 78 INVESTOR DAY 2026

President & CEO Greg Henderson Closing Remarks: Leader in Safe and Efficient Electrical Energy Transfer

Right Strategy to Capitalize on Our Opportunities Unparalleled Capabilities to Enable Transformation and Enhance Growth Transformational Shift in Electrification of Our Markets Why We Are Excited for the Future Driving Value for Stakeholders

Q&A All Presenters

Appendix Non-GAAP to GAAP Reconciliation Tables

Supplemental Financial Information Non-GAAP EPS reconciliation Q4-25 Q4-24 YTD-25 YTD-24 GAAP diluted EPS $ (9.72) $ (2.09) $ (2.89) $ 4.00 EPS impact of Non-GAAP adjustments (below) 12.41 3.61 13.57 3.97 Adjusted diluted EPS $ 2.69 $ 1.53 $ 10.68 $ 7.97 Non-GAAP adjustments – (income) / expense (in millions) Q4-25 Q4-24 YTD-25 YTD-24 Acquisition-related and integration costs (a) $ 2.4 $ 2.4 $ 5.4 $ 5.1 Purchase accounting inventory adjustments (b) 1.1 — 0.6 — Restructuring, impairment and other charges (c) 306.9 98.1 320.1 108.4 Gain on sale of fixed assets (d) — — — (1.5) Loss on sale of the Marine business (e) — — 0.3 — Non-GAAP adjustments to operating (loss) income 310.4 100.5 326.4 112.0 Other expense (income), net (f) 0.6 1.6 0.6 1.3 Non-operating foreign exchange loss (gain) 1.1 (13.5) 16.6 (9.2) Non-GAAP adjustments to (loss) income before income taxes 312.2 88.5 343.6 104.1 Income taxes (g) 2.4 (1.5) 4.6 4.7 Non-GAAP adjustments to net (loss) income 309.8 90.0 339.0 99.4 Total EPS impact $ 12.41 $ 3.61 $ 13.57 $ 3.97 Note: Total will not always foot due to rounding. (a) reflected in selling, general and administrative expenses (“SG&A”). (b) reflected in cost of sales. (c) reflected in restructuring, impairment and other charges. In the fourth quarter of 2025, the Company recorded a $301.2 million non-cash goodwill impairment charge related to the Electronics-Semiconductor reporting unit within the Electronics segment. In addition, during the fourth quarter of 2025, the Company recognized a $0.5 million and $0.4 million impairment charges related to certain machinery and equipment in the commercial vehicle business within the Transportation segment and the electronics products business within the Electronics segment, respectively. In the fourth quarter of 2024, the Company recorded $92.6 million of non-cash impairment charges, which included $47.8 million for the impairment of intangible assets primarily related to certain acquired customer relationships, developed technology, and tradename in the Industrial controls and sensors reporting unit within the Industrial segment, and $36.1 million and $8.6 million non-cash goodwill impairment charge associated with the Industrial controls and sensors reporting unit within the Industrial segment and the Automotive sensors reporting unit within the Transportation segment, respectively. In addition, during the first quarter of 2024, the Company recognized a $0.9 million impairment related to certain machinery and equipment in the commercial vehicle business within the Transportation segment. (d) 2024 amount reflected a gain of $0.5 million recorded for the sale of a land use right within the Electronics segment and a gain of $1.0 million for the sale of two buildings within the Transportation segment. (e) 2025 amount reflected $0.3 million loss related to the sale of the Marine business within the Transportation segment. (f) 2025 included $0.6 million increase in coal mining reserves. 2024 included $1.8 million increase in coal mining reserves, partially offset by a reversal of $0.5 million for an asset retirement obligation charge related the disposal of a business in 2019. (g) reflected the tax impact associated with the non-GAAP adjustments.

Supplemental Financial Information Cont’d Adjusted operating margin / Adjusted EBITDA reconciliation (in millions) Q4-25 Q4-24 YTD-25 YTD-24 Net (loss) income $ (242.1) $ (51.8) $ (71.7) $ 100.2 Add: Income taxes 12.9 9.1 75.3 51.7 Interest expense 8.3 9.4 34.3 38.7 Foreign exchange loss (gain) 1.1 (13.5) 16.6 (9.2) Other income, net (3.0) (2.7) (17.0) (22.6) GAAP operating (loss) income $ (222.8) $ (49.5) $ 37.5 $ 158.8 Non-GAAP adjustments to operating (loss) income 310.4 100.5 326.4 112.0 Adjusted operating income $ 87.6 $ 51.0 $ 363.9 $ 270.8 Amortization of intangibles 15.5 14.7 59.8 62.1 Depreciation expenses 18.5 17.3 74.9 68.3 Adjusted EBITDA $ 121.6 $ 83.0 $ 498.6 $ 401.2 Net sales $ 593.9 $ 529.5 $ 2,386.3 $ 2,190.8 Net (loss) income as a percentage of net sales (40.8)% (9.8)% (3.0)% 4.6 % Operating margin (37.5)% (9.3)% 1.6% 7.2% Adjusted operating margin 14.7% 9.6% 15.2% 12.4% Adjusted EBITDA margin 20.5% 15.7% 20.9% 18.3%

Supplemental Financial Information Cont’d Adjusted EBITDA by Segment (in millions) YTD-25 YTD-24 Electronics Transportation Industrial Electronics Transportation Industrial GAAP operating income $ 220.1 $ 84.8 $ 59.0 $ 169.9 $ 58.6 $ 42.3 Add: Add back amortization 40.4 13.5 5.9 39.4 13.5 9.2 Add back depreciation 47.6 21.2 6.1 40.4 22.1 5.8 Adjusted EBITDA $ 308.1 $ 119.5 $ 71.0 $ 249.7 $ 94.2 $ 57.3 Adjusted EBITDA Margin 22.9% 17.7% 19.5 % 21.0% 14.0% 17.3 % YTD-25 YTD-24 Net sales (in thousands) Electronics Transportation Industrial Electronics Transportation Industrial Electronics – Semiconductor $ 669,579 $ — $ — $ 615,372 $ — $ — Electronics – Passive Products and Sensors 675,943 — — 571,401 — — Commercial Vehicle Products — 320,545 — — 320,549 — Passenger Car Products — 293,641 — — 278,332 — Automotive Sensors — 62,191 — — 73,553 — Industrial Products — — 364,395 — — 331,561 Total $ 1,345,522 $ 676,377 $ 364,395 $ 1,186,77 $ 672,434 $ 331,561

Supplemental Financial Information Cont’d Income tax reconciliation Q4-25 Q4-24 YTD-25 YTD-24 Income taxes $ 12.9 $ 9.1 $ 75.3 $ 51.7 Effective rate (5.6)% (21.3)% 2,088.2% 34.0% Non-GAAP adjustments - income taxes 2.4 (1.5) 4.6 4.7 Adjusted income taxes $ 15.3 $ 7.6 $ 79.9 $ 56.4 Adjusted effective rate 18.4% 16.6% 23.0% 22.0% Free cash flow reconciliation Q4-25 Q4-24 YTD-25 YTD-24 Net cash provided by operating activities $ 138.7 $ 160.6 $ 433.8 $ 367.6 Less: Purchases of property, plant and equipment (18.9) (25.8) (67.6) (75.9) Free cash flow $ 119.7 $ 134.8 $ 366.1 $ 291.7 Free cash flow conversion Q4-25 Q4-24 YTD-25 YTD-24 Net (loss) income $ (242.1) $ (51.8) $ (71.7) $ 100.2 Free cash flow 119.7 134.8 366.1 291.7 Free cash flow conversion (49.4)% (260.2)% (510.6)% 291.1%

Supplemental Financial Information Cont’d Consolidated Total Debt (in millions) As of March 28, 2026 Consolidated total debt $ 631.5 Unamortized debt issuance costs 3.5 Finance lease liability 0.2 Consolidated funded indebtedness 635.2 Cash held in U.S. (up to $400 million) 67.6 Net debt $ 567.6 Consolidated EBITDA (in millions) Twelve Months Ended March 28, 2026 Net Loss $ (40.3) Interest expense 32.4 Income taxes 80.5 Depreciation expense 75.4 Amortization expense 62.0 Non-cash additions: Stock-based compensation expense 28.1 Purchase accounting inventory step-up charge 6.4 Unrealized loss on investments 2.1 Impairment charges 301.9 Other 34.1 Consolidated EBITDA (1) $ 582.6 Consolidated Net Leverage Ratio (as defined in the Credit Agreement) * 1.0x * Our Credit Agreement and Private Placement Note with maturities ranging from 2027 to 2031, contain financial ratio covenants providing that if, as of the last day of each fiscal quarter, the Consolidated Net Leverage ratio at such time for the then most recently concluded period of four consecutive fiscal quarters of the Company exceeds 3.50:1.00, an Event of Default (as defined in the Credit Agreement and Private Placement Senior Notes) is triggered. The Credit Agreement were amended in Q1 2026 and now allow to add restructuring charges and business optimization expenses in addition to the Prior credit agreement. (1) Represents Consolidated EBITDA as defined in our Credit Agreement and Private Placement Senior Notes and is calculated using the most recently concluded period of four consecutive quarters.

Supplemental Financial Information Cont’d Adjusted operating margin / Adjusted EBITDA reconciliation (in millions) YTD-25 Net loss $ (71.7) Add: Income taxes 75.3 Interest expense 34.3 Foreign exchange loss 16.6 Other income, net (17.0) GAAP operating income $ 37.5 Non-GAAP adjustments to operating income 326.4 Adjusted operating income $ 363.9 Amortization of intangibles 59.8 Depreciation expense 74.9 Adjusted EBITDA $ 498.6 Net sales $ 2,386.3 Net loss as a percentage of net sales (3.0) % Operating margin 1.6 % Adjusted operating margin 15.2 % Adjusted EBITDA margin 20.9 %

Supplemental Financial Information Cont’d Free cash flow reconciliation YTD-2021 YTD-2022 YTD-2023 YTD-2024 YTD-2025 Net cash provided by operating activities $ 373.3 $ 419.7 $ 457.4 $ 367.6 $ 433.8 Less: Purchases of property, plant and equipment (90.6) (104.3) (86.2) (75.9) (67.6) Free cash flow $ 282.7 $ 315.4 $ 371.2 $ 291.7 $ 366.1 Free cash flow conversion YTD-2021 YTD-2022 YTD-2023 YTD-2024 YTD-2025 Accumulated 5 years Net income (loss) $ 283.8 $ 373.3 $ 259.5 $ 100.2 $ (71.7) $ 945.1 Free cash flow 282.7 315.4 371.2 291.7 366.1 1,627.1 Free cash flow conversion 99.6 % 84.5 % 143.0 % 291.1 % (510.6) % 172.2 %

* Our Credit Agreement and Private Placement Note with maturities ranging from 2025 to 2032, contain financial ratio covenants providing that if, as of the last day of each fiscal quarter, the Consolidated Net Leverage ratio at such time for the then most recently concluded period of four consecutive fiscal quarters of the Company exceeds 3.50:1.00, an Event of Default (as defined in the Credit Agreement and Private Placement Senior Notes) is triggered. The Credit Agreement and Private Placement Senior Notes were amended in Q2 2022 and now allow for the addition of acquisition and integration costs up to 15% of Consolidated EBITDA and the netting of up to $400M of Available Cash (Cash held by US Subsidiaries). (1) Represents Consolidated EBITDA as defined in our Credit Agreement and Private Placement Senior Notes and is calculated using the most recently concluded period of four consecutive quarters. Supplemental Financial Information Cont’d Consolidated Total Debt As of December 27, 2025 Consolidated Total Debt $ 802.6 Unamortized debt issuance costs 1.8 Finance lease liability 0.2 Consolidated funded indebtedness $ 804.6 Cash held in U.S. (up to $400 million) 144.3 Net debt $ 660.3 (in millions)Consolidated EBITDA Twelve Months Ended December 27, 2025 Net loss $ (71.9) Interest expense 34.3 Income taxes 75.3 Depreciation 74.9 Amortization 59.8 Non-cash additions: Stock-based compensation expense 27.3 Purchase accounting inventory step-up charge 0.6 Unrealized loss on investments 3.6 Impairment charges 302.1 Other 38.5 Consolidated EBITDA (1) $ 544.5 Consolidated Net Leverage Ratio (as defined in the Credit Agreement)* 1.2x

(1) As reported is based on Q4 and FY 2024 result published on January 28, 2025. Actual is based on the final 10-K report. * Our Credit Agreement and Private Placement Note with maturities ranging from 2024 to 2032, contain financial ratio covenants providing that if, as of the last day of each fiscal quarter, the Consolidated Net Leverage ratio at such time for the then most recently concluded period of four consecutive fiscal quarters of the Company exceeds 3.50:1.00, an Event of Default (as defined in the Credit Agreement and Private Placement Senior Notes) is triggered. The Credit Agreement and Private Placement Senior Notes were amended in Q2 2022 and now allow for the addition of acquisition and integration costs up to 15% of Consolidated EBITDA and the netting of up to $400M of Available Cash (Cash held by US Subsidiaries). (2) Represents Consolidated EBITDA as defined in our Credit Agreement and Private Placement Senior Notes and is calculated using the most recently concluded period of four consecutive quarters. Supplemental Financial Information Cont’d Consolidated Total Debt As of December 28, 2024 Consolidated Total Debt $ 856.1 Unamortized debt issuance costs 2.8 Finance lease liability 0.3 Consolidated funded indebtedness $ 859.2 Cash held in U.S. (up to $400 million) 302.2 Net debt $ 557.0 (in millions) Twelve Months Ended December 28, 2024 Twelve Months Ended December 28, 2024 Consolidated EBITDA As Reported (1) Actual (1) Net Income $ 112.8 $ 100.0 Interest expense 38.7 38.7 Income taxes 51.7 51.7 Depreciation 68.3 68.3 Amortization 62.1 62.1 Non-cash additions: Stock-based compensation expense 26.0 26.0 Unrealized loss on investments (0.1) (0.1) Impairment charges 93.5 93.5 Other 3.7 3.7 Consolidated EBITDA (2) $ 456.7 $ 443.9 Consolidated Net Leverage Ratio (as defined in the Credit Agreement)* 1.2x 1.3x

* Our Credit Agreement and Private Placement Note with maturities ranging from 2023 to 2032, contain financial ratio covenants providing that if, as of the last day of each fiscal quarter, the Consolidated Net Leverage ratio at such time for the then most recently concluded period of four consecutive fiscal quarters of the Company exceeds 3.50:1.00, an Event of Default (as defined in the Credit Agreement and Private Placement Senior Notes) is triggered. The Credit Agreement and Private Placement Senior Notes were amended in Q2 2022 and now allow for the addition of acquisition and integration costs up to 15% of Consolidated EBITDA and the netting of up to $400M of Available Cash (Cash held by US Subsidiaries). (1) Represents Consolidated EBITDA as defined in our Credit Agreement and Private Placement Senior Notes and is calculated using the most recently concluded period of four consecutive quarters. Supplemental Financial Information Cont’d Consolidated Total Debt As of December 30, 2023 Consolidated Total Debt $ 871.9 Unamortized debt issuance costs 3.8 Finance lease liability $ 0.7 Consolidated funded indebtedness $ 876.4 Cash held in U.S. (up to $400 million) $ 178.6 Net debt $ 697.8 (in millions) Consolidated EBITDA Twelve Months Ended December 30, 2023 Net Income $ 259.4 Interest expense 39.9 Income taxes 69.1 Depreciation 71.6 Amortization 65.8 Non-cash additions: Stock-based compensation expense 23.9 Unrealized loss on investments 0.3 Impairment charges 4.9 Other 13.4 Consolidated EBITDA (1) $ 548.3 Consolidated Net Leverage Ratio (as defined in the Credit Agreement)* 1.3x

* Our Credit Agreement and Private Placement Note with maturities ranging from 2023 to 2032, contain financial ratio covenants providing that if, as of the last day of each fiscal quarter, the Consolidated Net Leverage ratio at such time for the then most recently concluded period of four consecutive fiscal quarters of the Company exceeds 3.50:1.00, an Event of Default (as defined in the Credit Agreement and Private Placement Senior Notes) is triggered. The Credit Agreement and Private Placement Senior Notes were amended in Q2 2022 and now allow for the addition of acquisition and integration costs up to 15% of Consolidated EBITDA and the netting of up to $400M of Available Cash (Cash held by US Subsidiaries). (1) Represents Consolidated EBITDA as defined in our Credit Agreement and Private Placement Senior Notes and is calculated using the most recently concluded period of four consecutive quarters. Supplemental Financial Information Cont’d Consolidated Total Debt As of December 31, 2022 Consolidated Total Debt $ 1,001.5 Unamortized debt issuance costs 4.8 Finance lease liability $ 1.8 Consolidated funded indebtedness $ 1,008.1 Cash held in U.S. (up to $400 million) $ 110.6 Net debt $ 897.5 (in millions) Consolidated EBITDA Twelve Months Ended December 31, 2022 Net Income $ 373.3 Interest expense 26.2 Income taxes 69.7 Depreciation 65.0 Amortization 55.7 Non-cash additions: Stock-based compensation expense 23.6 Purchase accounting inventory step-up charge 15.6 Unrealized loss on investments 14.0 Impairment charges 4.5 Other 81.9 Consolidated EBITDA (1) $ 729.5 Consolidated Net Leverage Ratio (as defined in the Credit Agreement)* 1.2x

* Our Private Placement Senior Notes, with maturities ranging from 2022 to 2030, contain a financial ratio covenant providing that if, as of the last day of each fiscal quarter, the ratio of Consolidated total gross debt at such time to Consolidated EBITDA for the then most recently concluded period of four consecutive fiscal quarters of the Company exceeds 3.50:1.00, an Event of Default (as defined in the Private Placement Senior Notes) is triggered (1) Represents Consolidated EBITDA as defined in our Private Placement Senior Notes and is calculated using the most recently concluded period of four consecutive quarters. Supplemental Financial Information Cont’d Consolidated Total Debt As of January 1, 2022 Consolidated total gross debt $ 615.0 Unamortized debt issuance costs (3.1) Consolidated Total Debt $ 611.9 (in millions) Consolidated EBITDA (as defined in the Private Placement Senior Notes) (1) Twelve Months Ended January 1, 2022 Net Income $ 283.8 Interest expense 18.5 Income taxes 57.2 Depreciation 55.9 Amortization 42.7 Non-cash additions (reductions): Non-cash pension settlement charge 19.9 Stock-based compensation expense 19.6 Purchase accounting inventory step-up charge 8.4 Unrealized gain on investments (8.9) Other 26.7 Consolidated EBITDA (as defined in the Private Placement Senior Notes) (1) $ 523.8 Ratio of Consolidated total gross debt to Consolidated EBITDA (as defined in Private Placement Senior Notes)* 1.2x

Appendix Speaker Bios

Dr. Henderson was appointed President and Chief Executive officer effective February 10, 2025. From 2017 to 2024, Dr. Henderson served as the Senior Vice President of the Automotive & Energy, Communications, and Aerospace Group for Analog Devices, Inc. (NASDAQ: ADI), a semiconductor company specializing in data conversion, signal processing and power management technology. Previously, he served as Vice President of the RF and Microwave Business for Analog Devices from 2014 to 2017, and as Vice President of the RF and Microwave Business for Hittite Microwave Corporation until its acquisition by Analog Devices in 2014. Before joining Hittite, Dr. Henderson held various positions of increasing technical and leadership responsibility at Harris Corporation, Tyco Electronics, TriQuint Semiconductor, and IBM (NYSE: IBM). Dr. Henderson holds a bachelor’s degree in electrical engineering from Texas Tech University and a Ph.D. in electrical engineering from the Georgia Institute of Technology. GREG HENDERSONPresident and Chief Executive Officer, Member of Board of Directors

Mr. Khandelwal joined Littelfuse in 2025 as Executive Vice President and Chief Financial Officer. Prior to joining Littelfuse, he served as Senior Vice President and Chief Financial Officer of IDEX Corporation, an industrial design and manufacturing company, from 2023 to 2025. Prior to that, Mr. Khandelwal served as Chief Financial Officer of Multi-Color Corporation, a manufacturer of printed labels for consumer goods, from 2022 to 2023, and as Senior Vice President and Chief Financial Officer of CIRCOR International, a pump & valve systems and custom engineering & design company, from 2020 to 2021. From 2010 to 2020, Mr. Khandelwal held various finance roles at IDEX Corporation, including as Vice President of Finance Operations, Treasury and Financial Planning & Analysis. ABHI KHANDELWALExecutive Vice President and Chief Financial Officer

Mr. Kim joined Littelfuse in 2003 as Manager, Global Procurement. He then held various positions of increasing responsibility at Littelfuse including Director, Global Procurement; Director, Electronics Product Management; Vice President, Asia Sales; Vice President, Global Sales from 2017 to 2019; and Vice President and General Manager, Industrial Business from 2019 until assuming his current position in 2022. PETER KIMSenior Vice President and General Manager, EII Market

Mr. Nayar joined Littelfuse in 2005 as Business Line Director of the Electronics Business Unit. He then held various positions of increasing responsibility at Littelfuse including Vice President, Global Sales, Electronics Business Unit; Senior Vice President, Electronics Business Unit from 2011 until 2019; and Senior Vice President and General Manager, Electronics and Industrial Business from 2019 until assuming his current position in 2022. DEEPAK NAYARSenior Vice President and General Manager, CCDI Market

Mr. Ruppel joined Littelfuse in his current position in 2024. Prior to joining Littelfuse, Mr. Ruppel served as President at IDEX Optical Technologies from 2021 to 2024, and previously served in leadership roles at Montevideo Technology, Inc., Herman Miller, Eaton and Cooper Industries. DAVE RUPPELSenior Vice President and General Manager, T&L Market

Dr. Hamed joined Littelfuse in 2025. Prior to joining, he was most recently at Analog Devices where he served as Corporate Vice President, Industrial and Healthcare Business Group. Previously, he served as Vice President, Industrial Instrumentation Business Unit, and General Manager, Microwave Communications Group. Dr. Hamed also served in various leadership and technical roles at Hittite Microwave Corporation, TriQuint Semiconductor, and Mimix Broadband. Dr Hamed received a PhD in Electrical & Computer Engineering from Queen’s University in Canada. KARIM HAMEDSenior Vice President and General Manager, Semiconductor Business