# Y Combinator's Martech Investments: 36 Startups in Its Portfolio (2026) > The 36 Martech startups Y Combinator has backed, by stage: $717M raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/y-combinator-martech-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Pre-seed and seed 19 - [Mailgun](https://millionrounds.com/company/mailgun) - [RankScience](https://millionrounds.com/company/rankscience) - [*L* Loops](https://millionrounds.com/company/loops) - [Gusto Collective](https://millionrounds.com/company/gusto-collective) - [Stakeholder Labs](https://millionrounds.com/company/stakeholder-labs) - [Friendbuy](https://millionrounds.com/company/friendbuy) - [Pretty Instant](https://millionrounds.com/company/pretty-instant) - [userfox](https://millionrounds.com/company/userfox) - [*U* Upstream](https://millionrounds.com/company/upstream) - [Inboxbooster](https://millionrounds.com/company/inboxbooster) - [*P* Post.fm](https://millionrounds.com/company/post-fm) - [Procoto](https://millionrounds.com/company/procoto) - [Datlo](https://millionrounds.com/company/datlo) - [Letterdrop](https://millionrounds.com/company/letterdrop) - [Minimal](https://millionrounds.com/company/minimal) - [Affil.ai](https://millionrounds.com/company/affil-ai) - [1stCollab](https://millionrounds.com/company/1stcollab) - [HireSweet](https://millionrounds.com/company/hiresweet) - [SlideMail](https://millionrounds.com/company/slidemail) ## Stage not reported 8 - [Wochit](https://millionrounds.com/company/wochit) - [OneSignal](https://millionrounds.com/company/onesignal) - [Apptimize](https://millionrounds.com/company/apptimize) - [Posterous](https://millionrounds.com/company/posterous) - [Squad](https://millionrounds.com/company/squad) - [*F* FREY](https://millionrounds.com/company/frey) - [Shogun](https://millionrounds.com/company/shogun) - [Arthena](https://millionrounds.com/company/arthena) ## Series A 7 - [Moonshot Brands](https://millionrounds.com/company/moonshot-brands) - [Vector](https://millionrounds.com/company/vector) - [GrowthBook](https://millionrounds.com/company/growthbook) - [Bravely](https://millionrounds.com/company/bravely) - [Ekho Dealer](https://millionrounds.com/company/ekho-dealer) - [*D* Deed](https://millionrounds.com/company/deed) - [Loyal Guru](https://millionrounds.com/company/loyal-guru) ## Series B 2 - [Custora](https://millionrounds.com/company/custora) - [*5* 500Friends](https://millionrounds.com/company/500friends) ## Segment by segment ### Pre-seed and seed 19 startups · $111M raised - [**Mailgun**](https://millionrounds.com/company/mailgun) Mailgun offers APIs that allow users to send, receive and track emails. United States $51M - [**RankScience**](https://millionrounds.com/company/rankscience) RankScience is a San Francisco-based SEO and AI search agency that specializes in automated SEO solutions. United States $20M - [*L* **Loops**](https://millionrounds.com/company/loops) At LOOPS we are focused on closing the loop between quality video, quality audience, and quality brand advertisers. United States $14M - [**Gusto Collective**](https://millionrounds.com/company/gusto-collective) Gusto Collective is a Hong Kong-based augmented reality experience platform that offers web3 marketing services for businesses. Hong Kong SAR China $11M - [**Stakeholder Labs**](https://millionrounds.com/company/stakeholder-labs) Stakeholder Labs is a venture-backed enterprise software company founded in 2022, based in West Hollywood, California. United States $4.2M - [**Friendbuy**](https://millionrounds.com/company/friendbuy) Powering referral marketing for the hottest companies in e-commerce. United States $2.0M - [**Pretty Instant**](https://millionrounds.com/company/pretty-instant) Leading national platform for professional photography services. United States $1.4M - [**userfox**](https://millionrounds.com/company/userfox) userfox is a SaaS product that helps companies improve user retention through welcome, inactivity and custom trigger based emails. United States $1.4M ### Stage not reported 8 startups · $101M raised - [**Wochit**](https://millionrounds.com/company/wochit) Wochit is a cloud-based video creation and editing platform that enables organizations to produce high-impact, short-form video co United States $29M - [**OneSignal**](https://millionrounds.com/company/onesignal) OneSignal is a leading omnichannel customer engagement platform based in San Mateo, California. United States $27M - [**Apptimize**](https://millionrounds.com/company/apptimize) Apptimize is a mobile-first A/B testing and feature release management platform designed for product teams to optimize and iterate United States $19M - [**Posterous**](https://millionrounds.com/company/posterous) Posterous emerged from Y Combinator in the summer of 2008 as an innovative company focused on making blogging simple - as simple a United States $10M - [**Squad**](https://millionrounds.com/company/squad) Creative Design and Development United States $6.9M - [*F* **FREY**](https://millionrounds.com/company/frey) United States $5.8M - [**Shogun**](https://millionrounds.com/company/shogun) Shogun is an E-commerce platform that helps brands create unique buying experiences and optimize their online stores. United States $2.1M - [**Arthena**](https://millionrounds.com/company/arthena) Arthena is a venture-backed financial technology company. United States $1.2M ### Series A 7 startups · $473M raised - [**Moonshot Brands**](https://millionrounds.com/company/moonshot-brands) Moonshot Brands acquires, operates, and grows e-commerce businesses. United States $310M - [**Vector**](https://millionrounds.com/company/vector) Vector is an enterprise and business development firm that provides driving the growth of early-stage tech startups across southeast Asia. United Kingdom $91M - [**GrowthBook**](https://millionrounds.com/company/growthbook) GrowthBook is an open-source platform designed for feature flagging, A/B testing, and product analytics. United States $23M - [**Bravely**](https://millionrounds.com/company/bravely) Bravely is a modern creative consultancy at the intersection of storytelling, technology and marketing company. United States $15M - [**Ekho Dealer**](https://millionrounds.com/company/ekho-dealer) Ekho Dealer is a licensed dealership that vehicle manufacturers can integrate into their websites. United States $15M - [*D* **Deed**](https://millionrounds.com/company/deed) Deed is a challenge-based platform empowering HR specialists to carry out employee activities resulting in motivated and better pe United States $10M - [**Loyal Guru**](https://millionrounds.com/company/loyal-guru) Loyal Guru is a B2B SaaS loyalty platform based in Barcelona, Spain, founded in 2016. Spain $8.9M ### Series B 2 startups · $33M raised - [**Custora**](https://millionrounds.com/company/custora) Custora is the leader in advanced customer analytics for the retail industry. United States $20M - [*5* **500Friends**](https://millionrounds.com/company/500friends) Merkle Loyalty Solutions, formerly 500friends, is a leader in customer loyalty marketing solutions. United States $13M **How this map is made.** Every startup here works in Martech and has raised money in a round we track that names Y Combinator as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Y Combinator's AI portfolio** 1,143 startups · $44B](https://millionrounds.com/portfolio-maps/y-combinator-ai-portfolio)[Sector portfolio **Y Combinator's Fintech portfolio** 338 startups · $24B](https://millionrounds.com/portfolio-maps/y-combinator-fintech-portfolio)[Sector portfolio **Y Combinator's Big Data & Analytics portfolio** 201 startups · $3.4B](https://millionrounds.com/portfolio-maps/y-combinator-big-data-analytics-portfolio)[Sector portfolio **Y Combinator's Healthtech portfolio** 150 startups · $4.2B](https://millionrounds.com/portfolio-maps/y-combinator-healthtech-portfolio)[Sector portfolio **Y Combinator's IT Services portfolio** 148 startups · $840M](https://millionrounds.com/portfolio-maps/y-combinator-it-services-portfolio)[Sector portfolio **Y Combinator's Web3 & Crypto portfolio** 139 startups · $7.4B](https://millionrounds.com/portfolio-maps/y-combinator-web3-crypto-portfolio) ## Raising from investors like Y Combinator? 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