Aaron Holiday
Co-founder and Managing Partner @ 645 Ventures
New York, United States
Aaron Holiday is a Series A investor at 645 Ventures in New York focused on Software and Consumer. Aaron is the co-founder and Managing Partner at 645 Ventures. He oversees the firm’s investing approach, strategy, investor relations, and governance.Prior to 645, he developed advanced equities program trading and foreign exchange derivatives software at Goldman Sachs and GFI Group, and he established operational experience working with CEOs tobuild high-growth tech companies.As the first Managing Entrepreneurial Officer at Cornell Tech, Aaron worked in tandem with Greg Pass (former Chief Technology Officer of Twitter) to create and pioneer the campus Studio culture and pedagogy. He also guided complex technology startups toward commercial success, including companies like Nanit, where he led 645's seed stage investment. Aaron is now on the governing board of Cornell Tech, alongside a small group of tech and business leaders.Aaron received a B.S. in Computer Science with honors from Morehouse College and an MBA from Cornell University’s Johnson School of Management.
- Total investments:
- 14
- Last investment:
- Lead investor:
- 36%
Last updated:
For AI agents: llms.txt
Industries Aaron Holiday invests in
Stages Aaron Holiday invests in
Countries Aaron Holiday invests in
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Investment Focus
Industry
- Software 3 (21%)
- Consumer 2 (14%)
- E-Commerce 2 (14%)
- Health Care 2 (14%)
- Mobile Apps 2 (14%)
Stage
- Series A 5 (36%)
- Seed 4 (29%)
- Series B 3 (21%)
- Pre-Seed 1 (7%)
- Convertible Note 1 (7%)
Country
- United States 8 (57%)
- Spain 1 (7%)
- Mexico 1 (7%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| Upside is the only nationally scalable housing stability platform purpose-built for healthcare. The company partners with health plans and employers to identify and stabilize members and employees experiencing housing instability, connecting them to safe, supportive housing while reducing avoidable emergency utilization and improving healthoutcomes. Upside pairs dedicated Care Guides with AI-supported housing orchestration to deliver measurable results at scale. The platform serves Medicaid, Medicare Advantage, D-SNP, commercial, and employer-sponsored populations across the full housing continuum, from crisis intervention to long-term tenancy support. Founded in 2020 and headquartered in Fort Lauderdale, FL, Upside is redefining how healthcare addresses housing as a foundation of care. | $20M / Series A / Jun 25, 2026 | ||
| Efficient Capital Labs provides capital in a fast, seamless, and cost-effective manner to SaaS Businesses. Efficient Capital is the new Venture Capital. Efficient Capital cater to B2B SaaS businesses that maintain a significant product and operations presence in India, while generating their revenues from the US and other top markets.The firmalso helps businesses to a non-dilutive capital to help grow the business. | $11M / Series A / Aug 21, 2024 | ||
| Efficient Capital Labs provides capital in a fast, seamless, and cost-effective manner to SaaS Businesses. Efficient Capital is the new Venture Capital. Efficient Capital cater to B2B SaaS businesses that maintain a significant product and operations presence in India, while generating their revenues from the US and other top markets.The firmalso helps businesses to a non-dilutive capital to help grow the business. | $7M / Seed / Jul 13, 2023 | ||
| Causely is an autonomous service reliability platform that enables engineering teams to consistently meet reliability expectations of application users in complex, cloud-native environments. | $10.8M / Seed / Jun 29, 2023 | ||
| Innerwell is a first-of-its-kind psychedelic teletherapy platform. They partnered with leaders in psychedelic therapy education, Fluence Training, to create a foundational course in ketamine-assisted psychotherapy that will equip you with the knowledge you need to practice confidently. | $3M / Pre-Seed / Jun 01, 2022 | ||
| Upside is the only nationally scalable housing stability platform purpose-built for healthcare. The company partners with health plans and employers to identify and stabilize members and employees experiencing housing instability, connecting them to safe, supportive housing while reducing avoidable emergency utilization and improving healthoutcomes. Upside pairs dedicated Care Guides with AI-supported housing orchestration to deliver measurable results at scale. The platform serves Medicaid, Medicare Advantage, D-SNP, commercial, and employer-sponsored populations across the full housing continuum, from crisis intervention to long-term tenancy support. Founded in 2020 and headquartered in Fort Lauderdale, FL, Upside is redefining how healthcare addresses housing as a foundation of care. | $5M / Seed / Apr 20, 2022 | ||
| Skydropx is a logistics management system for e-commerce and retail in LATAM. It helps reduce time and costs by centralizing all the shipments in one place to provide better customer service. Skydropx helps ship postage at feasible rates, tracks and integrates shipments into the user's shopping cart in real-time using API, and utilizes anetwork of independent drivers for fast delivery, enabling users to send and receive parcels in a simplified manner. | $20M / Series A / Oct 26, 2021 | ||
| Genially is the world-leader in interactive visual communication. Use Genially as your all-in-one online tool to create stunning presentations, interactive images, infographics, dossiers, quizzes, resumes, etc. and enrich them with interactivity and animation effects in seconds. You no longer need a team of designers and programmers to make animpact with striking, visual communication in a flash. Use interactive and animated effects to easily distribute information in layers that viewers can explore and discover. Leave outdated content creation software behind, and stun and engage your audience with Genially. The Wow Effect is just a few clicks away.Choose from over 1000 templates, or start from scratch. Join a community of millions of users worldwide that includes businesspeople, teachers, marketers, designers and companies like Hulu, Danone, Michelin and Heineken. The future of communication awaits you. | $20M / Series B / Sep 22, 2021 | ||
| Spiketrap is your AI-powered data partner to seamlessly collect, store, and visualize critical user-generated content from across the internet. We monitor, measure, and help you manage the ebbs and flows of unfiltered discussions in order to improve your development decisions.Every creative endeavor is unique, and each audience communicatesdifferently. Maximize your understanding of your audience with Spiketrap while increasing your time-to-action via data-driven decisions.It was founded in 2016 and headquartered in San Francisco, California. | $3M / Seed / Jul 01, 2020 | ||
| Squire is a booking and payment platform that connects people with great barbers nationwide. Squire provides barbers and shop owners with the ability to operate their businesses with cashless and contactless pay transactions, thereby streamlining service interaction and helping them earn and retain loyal clients as a result. | $27M / Series B / Jun 09, 2020 | ||
| See all 14 investments → | |||
Co-Investors
About 645 Ventures
645 Ventures is an early-stage venture capital firm that partners with exceptional founders who are building iconic companies. We invest at the Seed and Series A stages and leverage our Voyager software platform to enable our Success team and Connected Network to help founders scale to the growth stage. Select portfolio companies that have reachedthe growth stage include Iterable, Goldbelly, Resident, Eden Health, FiscalNote, and Squire.We invest in four main areas: SaaS for the Second Wave, Citizen Professionals, The Engineering Value Chain Revolution, and Personalized Consumer Applications. You can read more here: https://645ventures.com/themes/645 Ventures has $200m+ in AUM and is growing fast with backing from leading institutional investors, including university endowments, funds of funds, and pension funds. We have over 35 active companies in our portfolio in the areas of enterprise SaaS, infrastructure software, and consumer technology. Several of our portfolio companies have been acquired by Google, Facebook, Expedia, and private equity firms.
645 Ventures Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Alessio Fanelli
Principal, Investment & Research
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Blake Jennelle
CTO In Residence
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Guerin Schwarberg
Vice President
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Justin Fargione
Senior Full Stack Engineer
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Matt Hawes
Associate
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FAQ
What does Aaron Holiday invest in?
Aaron Holiday invests primarily in Software, Consumer and E-Commerce startups, most often at Series A and Seed stage. Most of the 14 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
How do I contact Aaron Holiday?
Public channels for Aaron Holiday include LinkedIn, X (Twitter) and the website linked on this profile. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Aaron Holiday last invest?
The most recent investment recorded for Aaron Holiday closed in Jun 2026. Shizune tracks 14 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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