#11Q 2023 Financial Results BIGCOMMERCE#2B Disclaimer This presentation has been prepared by BigCommerce Holdings, Inc. ("we," "us," "our," "BigCommerce" or the "Company"). This presentation may contain forward-looking statements which constitute the views of the Company with respect to future events which can be identified by the use of forward-looking terminology such as "anticipate," "believe," "budget," "can," "continue," "commit," "control," "could," "estimate," "expect," "intend," "may," "ongoing," "plan," "potential," "predict," "project," "should," "will," "target" and similar words or phrases. These forward-looking statements include statements concerning the following: the impact of the COVID-19 pandemic and the associated economic uncertainty on the Company, our customers, and our partners, and our response thereto; our expectations regarding our revenue, expenses, sales, and operations; anticipated trends and challenges in our business and the markets in which we operate; our ability to compete in our industry and innovation by our competitors; our ability to anticipate market needs or develop new or enhanced services to meet those needs; our ability to manage growth and to expand our infrastructure; our ability to establish and maintain intellectual property rights; our ability to manage expansion into international markets and new industries; our ability to hire and retain key personnel; our ability to successfully identify, manage, and integrate any existing and potential acquisitions; our ability to adapt to emerging regulatory developments, technological changes, and cybersecurity needs; and our anticipated cash needs and our estimates regarding our capital requirements and our need for additional financing; and such other risks and uncertainties described more fully in our documents filed with or furnished to Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2022 as filed with the SEC on March 1, 2023 and the future annual, quarterly and current reports that we file with the SEC. The statements are made based upon management's beliefs and assumptions and on information available to management as of the date of this presentation. Forward-looking statements involve both known and unknown risks, and there is no assurance that such statements are correct or will prove, with the passage of time, to be correct. Actual events, results, achievements or performance may differ materially from those reflected, implied or contemplated by such forward looking statements. All forward-looking statements attributable to us are expressly qualified by these cautionary statements. Any past performance information presented herein is not a guarantee or indication of future results and should not be relied upon for such reason. The information contained herein may change at any time without notice, and we undertake no duty to update this information except as required by law. This presentation also contains estimates and other statistical data made by independent parties and by us relating to market size and other data about our industry. This data involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such data and estimates. In addition, projections, assumptions and estimates of our future performance and the future performance of the markets in which we operate are necessarily subject to a high degree of uncertainty and risk. Neither we nor our affiliates, advisors or representatives makes any representation as to the accuracy or completeness of that data or undertake to update such data after the date of this presentation. In addition to financial information prepared in accordance with generally accepted accounting principles in the United States ("GAAP"), we use certain non-GAAP financial measures to clarify and enhance our understanding, and aid in the period-to-period comparison, of our performance. We believe that these non-GAAP financial measures provide supplemental information that is meaningful when assessing our operating performance because they exclude the impact of certain amounts that our management and board of directors do not consider part of core operating results when assessing our operational performance, allocating resources, preparing annual budgets, and determining compensation. The non-GAAP measures have limitations, including that they may not be directly comparable to other companies, and you should not consider them in isolation or as a substitute for or superior to our GAAP financial information. See the Appendix to this presentation for a reconciliation of non-GAAP financial measures to their nearest GAAP equivalent. 2#3Who is BigCommerce#4BCompany overview BigCommerce is the Open SaaS platform for all stages of ecommerce growth ▸ BigCommerce is the premier open SaaS and composable platform for ecommerce ▸ We enable merchants to run best-of-breed technology solutions without friction ▸ We're growing enterprise rapidly ▸ We're the leader in omnichannel selling, helping merchants boost sales regardless of their size or existing platform Gillette W LIMITED TIME OFFER electrostate with a Poo Prote ProGlide Shield FREE $22 812 ADD TO CART UPLIFT DESK Skullcandy BADGLEY MISCHKA GET STARTED PRODUCTS SHAVING TIPS Get everything you need to start looking and feeling your best when you subscribe to your favorite razor THERE'S A BEST FOR EVERY MAN. SHOP NOW ABOUT GIFTS solo stove LIMITED TIME OFFER: Receive a free travel case with any ProGlide or ProGlide Shield purchase LONDON Gillette TED BAKER How It Works NATORI Leica berlin PACKAGING LONDON Login MOLTON BROWN ScJohnson PETER CHRISTIAN a 1-#5B Company overview BigCommerce at 3/31/23 $317M ARR +13% 1Q23 | +43% 1Q22 +43% 1Q21 $ Consistent revenue growth +9% 1Q23 | +42% 1Q22 +27% 2022 | +44% 2021 ~t F +21% enterprise account ARR growth ~t 77% Q1'23 non-GAAP gross margin $- Customer Target Segments Enterprise Mid-market target: $1M-$50M GMV Large enterprise target: $50M+ 72% of account ARR Non-enterprise SMB target: <$1M GMV 28% of account ARR Note: All statistics as of 3/31/2023 unless otherwise noted and include impact of the acquisition of Feedonomics. $229M Enterprise ARR 72% of total $317M ARR $39,260 enterprise account ARPA +11% 1Q23 | +12% 1Q22 5,828 enterprise accounts +9% 1Q23 | +51% 1Q22 Q1'23 new store launches Including Curology, innovative health and beauty brand; Conn's Home Plus, a leading retailer of furniture, appliances, and electronics; Tottenham Hotspur, one of the world's top football clubs; ASSA ABLOY, a global leader in door-opening solutions used in many of the world's locks and security installations; Harley-Davidson, iconic automotive brand; Diamonds Direct, a worldwide leader in diamond sourcing, selection, education and value 5#6B BigCommerce Enterprise accounts "Enterprise accounts” have at least one contracted enterprise plan. These accounts include mid market customers with $1M-50M per year in GMV to enterprise customers with greater than $50M per year in GMV Enterprise accounts: (a) may require complex product feature sets (b) look for custom-negotiated, multi-year contracts (c) want technical and professional services offerings (d) include merchants in both mid market and enterprise segments#7B BigCommerce enterprise accounts @ IPO vs today Enterprise accounts Mid-market target: $1-50M GMV Large enterprise target: $50M+ GMV Non-enterprise accounts SMB target: <$1M GMV $90M Note: statistics as of 3/31/23 $77M 3Q20 (IPO) Enterprise account ARR Retail account ARR 54% of account ARR Average revenue per enterprise account: $28,370 46% of account ARR $229M $88M 1Q23 72% of account ARR Average revenue per enterprise account: $39,260 28% of account ARR BigCommerce's enterprise business has grown rapidly in the brief time since IPO, driven by our key business strategy: disrupting legacy enterprise ecommerce.#8FINANCIALS Investing to win in the mid market and enterprise segments to drive Enterprise ARR growth +32% +37% +41% YOY $35 $38 +41% +44% $42 $46 $51 +46% +44% $55 $61 Note: growth rates represent organic + inorganic growth +44% +40% $67 $71 +44% $80 IPO +48% $90 +51% $101 +58% $112 +54% $123 +78% $160 +72% $173 +68% ■ Enterprise ARR $mil *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition $189 +68% $207 +35% $216 +21% || 1Q18 2Q18 3Q18 4Q18 1Q19 2Q19 3Q19 4Q19 1Q20 2Q20 3Q20 4Q20 1Q21 2Q21 3Q21 4Q21 1Q22 2Q22 3Q22 4Q22 1Q23 +30% $224 $229#9The market BigCommerce serves#10B FINANCIALS Global ecommerce momentum continues to accelerate and gain long-term share over brick and mortar Adoption of ecommerce is accelerating 19% 19% $5,920 $5,437 $5,075 il 20% 2021 2022 Retail ecommerce spend ($bil) 2023 21% $6,478 22% $7,046 23% Sources: eMarketer, Dec 2022; Morgan Stanley Research; William Blair Research $7,619 2024 2025 2026 Retail ecommerce (% of global retail spend) Many enterprises use 'monolithic' legacy ecommerce platforms that need to be replaced for more modern and flexible architecture Headless and composable commerce architecture makes implementing new ecommerce software for B2C and B2B merchants easier than the old rip-and-replace model#11BAddressable market: platform spend BigCommerce serves B2C and B2B merchants all on one platform Ecommerce platform spend forecasted to grow to $13.5B in 2026 Worldwide digital commerce applications revenue by deployment ($Bn) 7.0 8.0 9.2 10.5 12.0 13.5 2021A 2022E 2023E 2024E 2025E 2026E ■On-premise/other software ■Public cloud services (own IP) Source: IDC Worldwide Digital Commerce Applications Revenue Snapshot, May 2022. 21% CAGR (1%) CAGR 4 Enterprises are choosing Cloud/SaaS over on-premise software 4 BigCommerce uniquely combines the flexibility of open-source with API-first composability and the benefits of multi-tenant SaaS B2B application revenue spend is growing faster than B2C, and BigCommerce enables merchants to run B2B and B2B or a hybrid version on one platform 11#12BAddressable market: platform spend + digital marketing + major PSR components Addressable market expanding beyond platform spending $28BN TAM $BN TAM 30 25 20 15 10 5 0 2021E 2022E 2023E 2024E 2025E Payments Gross Margins¹ 95%+ 100% 75% ■ Platform ■ Digital marketing / Omni ■Apps Shipping Note:¹ Gross margins represent BIGC estimates based on net revenue recognition on PSR Sources and assumptions: (1) Tech platform spending based on IDC Worldwide Digital Commerce Applications Revenue Snapshot, 2021; (2) Digital marketing / Omnichannel spending based on eMarketer, March 2021, assuming US ecommerce ad spending is approximately 50% of global, with 2% addressable by BIGC through Feedonomics; (3) App TAM assumed to be equal to tech platform spending reflecting potential BIGC 20% revenue share; (4) Shipping and payments spending based on Grand View Research market size studies from May and June 2021; assuming 2% and 10% addressable, respectively. 12#13The BigCommerce go to market strategy#14B Growth strategy BigCommerce Strategic Focus STRATEGIC INITIATIVES STRATEGY PILLARS # Enterprise International Omnichannel Open SaaS Disruptive Tech A B2B Composable Commerce- as-a-Service 14#15BOMNICHANNEL Merchants want to be able to sell more everywhere. G 4 4 4 Accelerate growth by easily listing products across social channels, marketplaces, search engines and new regions. Drive channel performance through accurate and optimized listings. Elevate customer experience through consistent listings, up-to-date inventory levels and automated order syncing for fast fulfillment. Increase operational efficiency with a combination of automated and managed services. TED BAKER LONDON PUMA SONOS ♥CVS Health. * ebay amazon More GMV 3 Better customer experience Higher conversion Improved data and listings B 100+ ad, social, and marketplace channels More traffic f Increased views and ROAS O All trademarks and logos are the property of their respective owners (o 8#16B2B buyers across industries expect a modern experience similar to what B they see in consumer-focused ecommerce Publishing, Printing, IT & Electronics Industrial & Ag Supply Food, Beverage & CBD Healthcare, Medical & Safety Supply Apparel, Sports & Outdoors Manufacturing Homegoods & Building Supply Harvard Business Publishing Corporate Learning FARMER BOY amtouch DENTAL SUPPLY KELTY berlin PACKAGING ckfoods ovation in Food Cont HKⓇ living sherrilltree SIEMENS Healthineers USCutter XGREEN ROADS McDurmon ML ResMed MANN LAKE BEE & AG SUPPLY suppliesoutlet, BEER VERTICAL PPE Meistmel Protective EXNIORPAT Black Diamond BOBUX Odiono LifetimeBrands TECTRAN Driven to be BETTER BARRON DESIGNS Rainbow ECOScience CANDY CLUB SafetyCulture NATORI ascdirect.co.uk THE ON-LINE PACKAGING COMPANY Interform. EMPIRE Moulding & Millwork AMOND Building Products Company HANNA instruments Clarion WALTON'S Everything but the Meat. GIRL & DUG SAN DIEGO PORTLAND UDSON ASTENERG www.NSONPRSTENERS COM 1-877-49-SCREW S SILK WORLDWIDE THE ATS Advanced Technology Services, Inc. PREMIER SAFETY FUJITSU DE ELECTRONICS GZS TOBEN HSWHOLESALE JUUL MASTER DISTRIBUTOR PAN JANUFACTURING COOK&BOARDMAN GILDAN Orangetheory panache BRANDS GROUP BOXHUB. AORN SAFE SURGERY TOGETHER psi DuraMark Technologies ACLS The Chas. E. Phipps Company#17B Strategic Initiative Composable for enterprise ecommerce seeking the most modern approach to technology For enterprise customers, now more than ever, flexibility and composability are especially important: freedom to mix, match and combine best of breed tech solutions to create a more customized and robust technology stack. B2C and B2B merchants can now create the most modern customer experiences and enterprise grade solutions without limitations or complexity. MKM Mountain Equipment Company MACHA ALLIANCE Kōkatat TED BAKER LONDON GOREWEAR LARQ MitoQ K2 SPICEOLOGY solo stove YET! 4 C L E S Murad. bensons for beds 19SPORTS ●●● FOUR PILLARS LA PERIA SOG STUDIES AND OBSERVATIONS Fortune Brands A home and security company#18B COMPOSABLE (HEADLESS) Customer snapshot by integration NEXT. Gatsby NuxtJS WORDPRESS contentful CONTENTSTACK @algolia o bloomreach Ollie petit planet FORCITE VP VIDEOPRO K2 Black Diamond holly yashi SPICEOLOGY Airomé LONDON unu TED BAKER MITOQ solo stove Good Beautiful Spencil. 19SPORTS C4 CL e s LA PERLA Mountain Equipment Company HK GOREWEAR LARQ CANDLE WARMERS MKM OURA URBAN JUNGLE Kōkatat THE SCHOOL OF LIFE bensons for beds Murad. Since 1963 APPELLES. FOUR PILLARS SOGE STUDIES AND OBSERVATIONS Fortune Brands A home and security company#19B Commerce-as-a-Service Enable commerce anywhere, powered by BigCommerce 4 BigCommerce enables partners to create and sell customized commerce solutions powered by our platform technology. Ability to go-to-market with partners to serve more merchants in more ways and more places Tailor ecommerce to the specific needs of a category or use case ↓↑ avasam clover Cross-sell ecommerce fully integrated with a technology, application or service Payu silk Localize BigCommerce anywhere in the world in terms of sales, marketing, service WINE DIRECT InfoTrax </> UNBOUND COMMERCE Jmango Extend commerce to mobile apps, devices, form factors, and virtual use cases Zarla Embed ecommerce trial experiences within an existing offering 19#20B Strong enterprise customers across multiple verticals Health & Beauty MOLTON BROWN LONDON Apparel Electronics Home & Garden Food & Beverage Sports & Outdoors Automotive B2B & Industrial Chap Stick BADGLEY MISCHKA. BULK NUTRIENTS XGREEN ROADSⓇ Nature's One PURE SUPPLEMENTS ONE KINGS LANE THE musicdirect® .COM WINE TIENDA CLUB PUEBLA GORE® DUXIANA FARMER BOY FLYER 'EUROSPORT TUNING WEAR Mrs. K SPORTS. birdsnest SHARP Appliances BEER CARTEL) ITS FORCITE V m MEYER'S chairking CARILOHA BURROW CLEAN DAY BACKYARD STORE a NATORI LA PERIA motorola defy Tienda Chivas Lammes CANDIES SINCE 1885 PRIORITY TIRE ROCK BOTTOM GOLF Nikon Harvard Business Publishing Corporate Learning PETER CHRISTIAN JIMMY BRINGS pure barre MOONBIKES A MITOQ Leica vodafone BRICKHOUSE SECURITY. KYOCERA SGS Precision Tools YETI LARQ GRENSON ENGLAND 1966 Brock's PERFORMANCE AN aippine dots CHEM Black Diamond mountain rose herbs Reebok AMERICAN Ollie solo stove LEATHER ABI AND JOSEPH Mountain Equipment Company Skullcandy TECTRAN Driven to be BETTER VAN CAFE victoriahealth JOHNNIE WALKER BASKITS FOLD B3 NORWALL Big Green Egg The Ultimate Cooking Experience POWER SYSTEMS UNITED AQUA GROUP ******* WHEELS www.bbwheelsonline.com marucci FishUSA AMERICA'S TACKLE SHOP® KING ww BAKING HKⓇ living COMPANY mazda ResMed#21BackOffice, PIM, B2B, Hosting CMS BACKOFFICE PEOPLEVOX Brightpearl SKUVAULT LINNWORKS Acumatica skubana An incredible ecosystem of best of breed partner solutions OMNISTOCK B2B ΚΑΤΑΝΑ netlify PIM BIGCOMMERCE B2B EDITION behalf xentral ORACLE NETSUITE CMS/HOSTING/HEADLESS logicbroker. TradeCentric Jmango Formerly PunchOut2Go o bloomreach CONTENTSTACK™ contentful Vue Storefront magnolia STYLA shogun Acquia prismic umbraco B storyblok DEITY FALCON uniform Vercel akeneo inRiver sales layer CREDIT KEY Sage FedEx. FRONT. COMMERCE SALSIFY comestri. Plytix pimberly Insights, Tax & Accounting TAX & ACCOUNTING Avalara AvaTax quickbooks VERTEX xero INSIGHTS Pay Helm Segment ll"Fueled Ⓡ Google Big Query Shipping SHIPPING & FULFILLMENT ShipStation® SHIPPER HQ ShipBob shippo 90+ PREFERRED & ELITE DHL Globale sendcloud Happy Returns by PayPal Digital River DROPSHIPPING huboo ~unarvar avasam spocket Odoba Payments & FinTech PAYMENTS PayPal affirm) stripe Omnichannel MARKETPLACES & AD PLATFORMS ROUTE Google Shopping facebook Instagram Tik Tok parcelLab Target+ ebay Microsoft amazon Braintree adyen worldpay Klarna. mollie PARTNERS checkout.com nexi barclaycard authorize net cybersource Opayo Payu A Visa Solution mercado pago WALLETS & ACCELERATED CHECKOUT PayPal amazon pay G Pay Pay BOLT B Walmart MULTICHANNEL LISTINGS / FEEDS Sales & Orders feedonomics codisto channelengine ADVERTISING CAMPAIGN MANAGEMENT POS O TEAMWORK COMMERCE clover OMS Caut libre BigCommerce PARTNER mercado ROI HUNTER 1,000+ APPS fluentcommerce deckcommerce @posnow □ Square DYNAMIC CREATIVE Zettle by PayPal PIPE17 Marketing Automation EMAIL & MARKETING AUTOMATION dotdigital Constant Contact attentive mailchimp LOYALTY, REVIEWS & UGC AANNEX CLOUD LOYALTYLION nosto INTELLIGENT MERCHANDISING searchspring sendlane omnisend klaviyo Privy hawksearch By Bridgeline RATINGS & REVIEWS yotpo. 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Trustpilot J Judge.me SHOPGATE CUSTOMER SUPPORT & CRM LiveChat zendeskgorgias HubSpot UNBOUND JMANGO COMMERCE Stamped REVIEWS & RATINGS 50+ INDUSTRY CATEGORIES 21#22Financials#23B Continued focus on high value enterprise accounts as mix continues to shift further towards larger B2C and B2B merchants 43% 57% 1Q21 Enterprise account ARR as a % of total ARR 41% 59% 37% 63% 36% 64% 33% Enterprise account ARR 67% 2Q21 3Q21 4Q21 1Q22 30% 70% 29% 71% 28% Retail account ARR 72% 28% 72% 2Q22 3Q22 4Q22 1Q23 +54% +58% $123M $112M Enterprise account ARR ($M) +68% +72% $189M +78% $173M $160M 1Q21 2Q21 3Q21 4Q21 1Q22 *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition +35% +68% $216M $207M +30% $224M +21% $229M 2Q22 3Q22 4Q22 1Q23 23#24B Resilient subscription revenue growth through strategic shift to enterprise accounts, despite slower trends in consumer spending +22% YoY $112M $29M $83M 2019 +36% $152M $49M $104M 2020 y/y: Subscription Services 17% y/y: Partner and Services 38% 25% 65% Subscription Services Note: Amounts may not add due to rounding. +44% $220M $65M $155M 2021 49% 33% +27% $279M $73M $206M 2022 33% 13% +41% $47M $15M +35% $49M $15M $32M $34M 52% +49% $59M $17M $42M 1Q21 2Q21 3Q21 36% 42% 59% +42% +50% $65M $66M $18M $47M $48M 58% $18M 22% 30% 34% Partner and Services *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition 4Q21 1Q22 2Q22 50% +22% +12% +9% +39% $72M $72M $72M $68M 23% $17M $51M 51% 12% $19M $53M 3Q22 26% 12% $19M $18M $53M 4Q22 1Q23 14% $54M 6% 12% -1%#25B Healthy gross margin profile leading path towards profitable growth +22% YoY $85M 2019 % of total revenue: 76% Non-GAAP gross profit ($M) +40% $119M 2020 78% +46% $174M 2021 79% +23% $213M 2022 76% 81% $38M 80% $39M Non-GAAP gross profit ($M) 80% $47M 77% 76% 77% $56M $55M 76% $49M $50M 75% $52M 1Q21 2Q21 3Q21 4Q21 1Q22 2Q22 3Q22 4Q22 Note: Non-GAAP gross profit and gross margin exclude the effect of stock-based compensation and related payroll tax expense. See appendix for reconciliation of Non-GAAP measures to GAAP. 77% $56M 1Q23 25#26Driving leverage to deliver profitable growth. Targeting positive adjusted EBITDA in Q4'23 Non-GAAP operating expense as % of revenue 17% 38% 55% 2019 Operating margin: (34%) 18% 30% 48% 2020 (18%) 19% 27% 43% 2021 (10%) 20% Sales & Marketing 27% 46% 2022 (17%) Operating (7%) Margin % 19% 26% 43% 1Q21 Research & Development Non-GAAP operating expense as % of revenue (9%) 19% 27% 43% 2Q21 (6%) 18% 25% 43% (18%) (19%) 21% 28% 45% 20% General & Administrative 28% 46% (20%) 21% 28% 48% (16%) 22% 26% 45% (13%) 19% 26% 44% (9%) 19% 24% 43% 3Q21 4Q21 1Q22 2Q22 3Q22 4Q22 1Q23 Note: In Q1 2023, we reclassified certain costs that we had previously included in general and administrative expense into sales and marketing expense. To maintain consistency between comparable periods, the equivalent change has been applied to prior periods. This change in classification had no effect on the reported results of our operations or cash flow. Note: Non-GAAP operating expenses and operating margin exclude the effect of stock-based compensation and related payroll tax expense. See appendix for reconciliation of Non-GAAP measures to GAAP. Amounts may not add due to rounding. 26#274 Consistent merchant cohort growth, driven by increases in GMV and enterprise net revenue retention As merchants transact and grow in GMV, net revenue retention improves for SMB, mid-market, and enterprise base Strong LTV to CAC ratio of 3.8:1 for 2022 NRR for enterprise accounts was 111% in 2022 2016 2017 Annual Merchant Billings by Cohort 2018 2019 2020 2021 2022 Pre-2017 2017 cohort 2018 cohort ■2019 cohort 2020 cohort 2021 cohort ■2022 cohort Note: Annual Merchant Billings by Cohort includes both subscription plan revenue and partner and services revenue for the enterprise account cohort that joined the platform in the indicated period. 27#28Key Metrics 1 Annual revenue run-rate 2 Subscription annual revenue run-rate 3 Annual revenue run-rate for enterprise accounts 4 Enterprise accounts as a percent of annual revenue run-rate 5 Average revenue per account for enterprise accounts 6 Number of enterprise accounts 28#29BARR growth expected to improve behind increased focus and investments in high value, high retention enterprise accounts... (as of 3/31/23) +22% YoY $108M Q1 +25% $115M Q2 +26% +26% $129M $121M 2019 Q3 Q4 +27% $152M $137M Q1 +32% $167M Q2 +41% $196M +38% $181M 2020 Total ARR ($M) Q3 +38% +43% $209M Q4 Q1 Q2 +52% $269M $254M 2021 Q3 +48% $280M +41% +43% $296M Q4 Q1 Q2 +20% $305M 2022 Q3 +16% +13% $312M $317M Q4 *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition Note: Annual revenue run-rate ("ARR") is calculated as the sum of: (1) contractual monthly recurring revenue at the end of the period, which includes platform subscription fees, invoiced growth adjustments, feed management subscription fees, recurring professional services revenue, and other recurring revenue, multiplied by twelve to prospectively annualize recurring revenue, and (2) the sum of the trailing twelve-month non-recurring and variable revenue, which includes one-time partner integrations, one-time fees, payments revenue share, and any other revenue that is non-recurring and variable. Q1 2023 29#30B...with Subscription ARR growth pacing ahead of non-subscription ARR... (as of 3/31/23) 2 $84M Q1 $89M $94M Q2 2019 Q3 +23% YoY $99M Q4 +24% $104M Q1 +28% $114M Q2 +31% $123M 2020 Subscription ARR ($M) Q3 +34% $133M +37% $143M Q4 Q1 +34% $153M Q2 +57% $193M 2021 Q3 +54% $204M Q4 +48% +49% $226M $212M Q1 Q2 +15% +17% +21% $238M $233M $244M 2022 Q3* Q4 *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition Note: "Subscription annual revenue run-rate" is calculated by subtracting the trailing twelve months of partner and services revenue from Total annual revenue run-rate Q1 2023 30#31...and enterprise accounts outpacing non-enterprise accounts and partner and services revenue (as of 3/31/23) +44% YoY +46% $51M $55M Q1 Q2 +44% $61M 2019 Q3 +44% +40% $67M $71M Q4 Q1 +44% $80M Q2 2020 Enterprise ARR ($M) +51% $112M +48% $101M $90M Q3 +54% +58% $123M Q4 Q1 *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition Note: Enterprise accounts represent any account with at least one BigCommerce enterprise plan Q2 +78% $160M 2021 Q3 +68% +68% $207M +72% $189M $173M Q4 Q1 Q2 +35% $216M 2022 Q3* +21% +30% $229M $224M Q4 Q1 2023 31#32B (as of 3/31/23) 4 47% 72% of ARR from enterprise accounts today, driven by durable growth in mid market and enterprise segments Q1 48% Q2 50% 2019 Q3 52% Q4 52% Q1 % of ARR attributable to enterprise accounts 53% Q2 54% 2020 Q3 56% Q4 57% Q1 Note: Enterprise accounts represent any account with at least one BigCommerce enterprise plan 59% Q2 2021 63% Q3 64% Q4 67% Q1 70% Q2 2022 71% Q3 72% Q4 72% Q1 2023 32#33Mid market strength and up market progress into enterprise segment driving steady growth in ARPA over time (as of 3/31/23) B 5 +27% YoY $21.0k Q1 +25% $21.9k Q2 +24% $23.2k 2019 Q3 +22% $24.4k Q4 +19% $25.1k Q1 ARPA attributable to enterprise accounts ($k) +23% $28.4k $26.9k Q2 +22% $29.9k 2020 Q3 +26% +23% $31.6k $31.4k Q4 +17% +17% $33.3k Q1 Q2 2021 Q3 +15% $34.3k Q4 +12% $35.2k Q1 +17% +11% +22% +13% $38.1k $38.9k $38.7k $39.3k Q2 Q3 2022 Q4 Note: Average revenue per account ("ARPA") for enterprise accounts is calculated at the end of a period by including customer-billed revenue and an allocation of partner and services revenue, where applicable. Q1 2023 33#34Mid market and enterprise focus yielding account growth and opportunities with larger, more complex customers (as of 3/31/23) B 6 +13% YoY 2.4k Q1 +17% 2.5k Q2 +17% 2.6k 2019 Q3 +17% 2.7k Q4 +17% 2.8k Q1 +17% 3.0k Q2 Number of enterprise accounts ($k) +21% 3.2k 2020 Q3 +23% 3.4k Q4 +32% +26% 3.9k 3.6k Q1 Q2 +50% +52% 5.0k 4.8k 2021 Q3 Q4 +51% +38% 5.4k 5.4k Q1 Q2 +9% +15% +16% 5.8k 5.8k 5.6k 2022 Q3* Q4 *Note: Q3 2022 marks the 1 year anniversary of the Feedonomics acquisition Note: Enterprise accounts represent any account with at least one BigCommerce enterprise plan. Year-over-year growth rates may not compute due to rounding. Q1 2023 34#35Investment highlights Large and growing addressable market Strong, long-term secular tailwinds tied to digital commerce with TAM expanding beyond ecommerce platform spending in the US and abroad Open SaaS Disruptive platform and partner approach that prioritizes enterprise functionality, best of breed technologies and freedom of choice for all merchants Consistent revenue growth Revenue mix shift to mid-market and enterprise customers driving durable, consistent revenue growth and strong unit economics Strong gross margins High margin revenue share from established partnership agreements has driven consistently high gross margins Increasing operating leverage Continuing to invest in long-term growth opportunities while managing spend to hit adjusted EBITDA break-even Q4'23 35#36Appendix#37GAAP income statement Figures in thousands Revenue Cost of Revenue (¹) Gross Profit Operating Expenses Sales & Marketing (¹) Research & Development (¹) General & Administrative (¹) Acquisition Related Expenses Restructuring Charges Amortization of Intangible Assets Total Operating Expenses Loss from Operations Interest Income Interest Expense Other (Expense) Income Loss Before Provision for Income Taxes Provision for Income Taxes Net Loss Year Ended December 31, 2022 2021 $219,855 48,479 171,376 104,845 64,547 51,344 23,299 3,284 247,319 (75,943) 130 (828) (70) (76,711) (34) ($76,677) $279,075 69,980 209,095 141,342 88,253 69,441 35,216 7,332 8,078 349,622 (140,567) 4,198 (2,828) (227) (139,424) 495 ($139,919) Three Months Ended March 31, 2022 2023 $66,050 17,103 48,947 33,639 20,944 15,846 12,660 2,037 85,126 (36,179) 122 (709) (156) (36,922) 115 ($37,037) $71,757 17,446 54,311 34,052 20,845 16,494 4,125 420 2,033 77,969 (23,658) 2,426 (722) 31 (21,923) 197 ($22,120) (1) Includes stock-based compensation. Note: In Q1 2023, we reclassified certain costs that we had previously included in general and administrative expense into sales and marketing expense. To maintain consistency between comparable periods, the equivalent change has been applied to prior periods. This change in classification had no effect on the reported results of our operations or cash flow. 37#38Non-GAAP reconciliation Figures in thousands Gross Profit GAAP Gross Profit Stock-based Compensation (¹) Non-GAAP Gross Profit Non-GAAP Gross Margin Sales & Marketing GAAP S&M Expense Stock-based Compensation (¹) Non-GAAP S&M Expense Non-GAAP S&M as % of Revenue Research & Development GAAP R&D Expense Stock-based Compensation (¹) Non-GAAP R&D Expense Non-GAAP R&D as a % of Revenue General & Administrative GAAP G&A Expense Stock-based Compensation (¹) Non-GAAP G&A Expense Non-GAAP G&A as % of Revenue Operating Loss GAAP Operating Loss Stock-based Compensation (¹) Acquisition Related Expenses Restructuring Charges Amortization of Intangible Assets Non-GAAP Operating Loss Non-GAAP Operating Margin Q1'21 $37,410 415 $37,825 81% $21,960 1,913 $20,047 43% $13,535 1,267 $12,268 26% $10,457 1,824 $8,633 19% ($8,542) 5,419 ($3,123) (7%) Q2'21 Q3'21 $38,828 $46,882 545 $39,373 80% $23,676 2,461 $21,215 43% $14,725 1,526 $13,199 27% $11,591 2,405 $9,186 19% ($12,271) $6,937 1,107 ($4,227) (9%) 310 $47,192 80% $27,438 2,192 $25,246 43% $13,033 2,167 $ 10,866 18% $16,532 $19,755 $64,547 $20,944 1,624 1,753 6,170 2,563 $14,908 $18,003 $58,377 $18,381 25% 28% 27% 28% ($21,315) $6,293 9,792 Q4'21 2021 Q1'22 $48,256 $171,376 $48,947 852 2,122 868 $49,108 $173,498 $49,815 76% 79% 75% 1,402 ($3,828) (6%) $16,263 $51,344 2,454 8,850 $13,809 $42,495 21% 19% $31,771 $104,845 $33,639 $36,033 $35,973 $35,697 $141,342 $34,052 2,828 9,394 2,975 3,567 3,254 3,757 13,553 2,867 $28,943 $95,451 $30,664 $32,466 $32,719 $31,940 $127,789 $31,185 45% 46% 48% 45% 44% 46% 43% 43% $15,846 2,702 $13,144 20% ($33,815) ($75,943) ($36,179) 7,887 26,535 9,108 12,400 23,299 12,660 1,882 3,284 ($11,647) ($22,825) (18%) (10%) Q2'22 Q3'22 $51,343 $54,866 987 1,091 $52,330 $55,957 77% 77% 2,037 ($12,374) (19%) $22,394 3,042 $19,352 28% $17,526 3,338 $14,188 21% ($39,140) 10,934 12,521 $22,245 $22,669 $88,253 3,144 3,639 12,388 $19,101 $19,030 $75,865 26% 26% 27% $18,932 3,296 $15,636 22% Q4'22 2022 $53,939 $209,095 1,280 4,226 $55,219 $213,321 76% 76% ($30,560) 10,785 6,260 2,016 2,009 ($13,676) ($11,499) (20%) (16%) $17,137 $69,441 3,483 12,819 $13,654 $56,622 19% 20% ($34,687) ($140,567) 12,159 42,986 3,775 35,216 7,332 7,332 2,016 8,078 ($9,405) ($46,955) (13%) (17%) Q1'23 $54,311 1,189 $55,500 77% (1) Includes payroll tax associated with stock-based compensation expense. Note: In Q1 2023, we reclassified certain costs that we had previously included in general and administrative expense into sales and marketing expense. To maintain consistency between comparable periods, the equivalent change has been applied to prior periods. This change in classification had no effect on the reported results of our operations or cash flow. $20,845 3,503 $17,342 24% $16,494 3,079 $13,415 19% ($23,658) 10,638 4,125 420 2,033 ($6,442) (9%) 38#39Adjusted EBITDA reconciliation Figures in thousands Net Loss Stock-based Compensation Expense Payroll Tax Associated with Stock-based Compensation Expense Third-party Acquisition Related Costs Depreciation Amortization of Intangible Assets Interest Income Interest Expense Provision for Income Taxes Restructuring Charges Other Income/Expense Adjusted EBITDA Year Ended December 31, 2021 ($76,677) 25,424 1,111 23,299 2,867 3,284 (130) 828 (34) 70 ($19,958) 2022 ($139,919) 42,332 654 35,216 3,344 8,078 (4,198) 2,828 495 7,332 227 ($43,611) Three Months Ended March 31, 2022 ($37,037) 8,962 146 12,660 789 2,037 (122) 709 115 156 ($11,585) 2023 ($22,120) 10,487 151 4,125 957 2,033 (2,426) 722 197 420 (31) ($5,485) 39#40B Non-GAAP net loss reconciliation Figures in thousands Net Loss Stock-based Compensation Expense Payroll Tax Associated with Stock-based Compensation Expense Third-party Acquisition Related Costs Amortization of Intangible Assets Restructuring Charges Non-GAAP Net Loss Year Ended December 31, 2021 ($76,677) 25,424 1,111 23,299 3,284 ($23,559) 2022 ($139,919) 42,332 654 35,216 8,078 7,332 ($46,307) Three Months Ended March 31, 2022 ($37,037) 8,962 146 12,660 2,037 ($13,232) 2023 ($22,120) 10,487 151 4,125 2,033 420 ($4,904) 40