A* Closes $450M Fund III as Kevin Hartz Doubles Down on Small-Fund, High-Conviction Seed Investing
TL;DR
A*, the early-stage venture firm co-founded by Eventbrite and Xoom co-founder Kevin Hartz alongside ex-Coatue partner Bennett Siegel, has closed its third fund at $450 million. That is a 43% step-up over the $315 million Fund II in 2024 and a 50% increase over the $300 million Fund I in 2021, but A* is still deliberately keeping check sizes between $3 million and $5 million and capping the portfolio at around 30 companies. The pitch to LPs is simple. In a market where Sequoia just raised a $7 billion expansion fund and a16z is sitting on tens of billions, a $450 million generalist seed fund is structurally underwriter-friendly, ownership-protective, and capable of returning the entire fund off a single Ramp or Mercor outcome.
Key Takeaways
"Less-is-more" is the only honest seed thesis left in 2026. A* could have raised $1 billion based on Hartz's network, the Ramp markup, and Mercor heat. Choosing to stop at $450 million signals that the GPs are prioritizing fund-level math over AUM growth, which is what disciplined LPs actually want at seed.
The portfolio cap is the real product. Backing 30 companies with $3 million to $5 million checks means A* can underwrite 10%+ ownership at entry without crowding the cap table. That ownership threshold is what gives small-fund seed managers a path to top-decile TVPI when one or two companies break out.
Carnegie Mellon as an anchor LP is a recruiting and dealflow weapon. Endowment money is sticky, signals quality to other LPs, and gives A* a cleaner pipeline into university spinouts and young technical founders, which is exactly where its existing portfolio bias points.
Hartz's teenage-founder thesis is no longer a quirk. Mercor, Ramp, and a cluster of A* bets have validated the idea that the highest-velocity AI and fintech founders are skipping the credentialing track entirely. Fund III lets A* keep scouting at that age bracket while peers are still arguing about it.
Fund Overview
Fund Name: A* Fund III
Fund Size: $450 million
Stage: Seed and early-stage
Check Size: $3 million to $5 million average
Geography: US-focused, generalist
Focus: AI applications, fintech, healthcare, security; roughly 30 companies; ownership-driven
Key LPs: Carnegie Mellon University (publicly named), nonprofits, foundations and endowments
Why This Fund Matters
The 2024 to 2026 fundraising market has fractured into two camps. On one end, the megafunds keep getting bigger: Sequoia at $7 billion for its latest expansion vehicle, Founders Fund nearing a $6 billion growth fund, Kleiner Perkins at $3.5 billion across two AI vehicles. On the other end, a small group of conviction-driven managers, of which A* is now arguably the cleanest example, is deliberately staying under $500 million at seed because the math at that size is the only place where 10% to 15% entry ownership and 5x to 10x DPI still rationally coexist.
A* sits unusually well-positioned in that second camp. Hartz brings the founder-operator credibility that LPs increasingly insist on after a decade of credential-led GPs underperforming, and Siegel adds growth-stage pattern recognition from Coatue that lets A* read late-stage signals back into seed selection. The pair has been disciplined. Fund I was $300 million, Fund II was $315 million, and Fund III at $450 million represents a controlled step-up rather than the doubling or tripling that wrecks most second and third-time funds.
The other structural advantage worth flagging is sector breadth. AI, fintech, healthcare, and security are four of the five sectors that institutional LPs most want exposure to right now, and a generalist seed fund with 30 portfolio companies hits all of them without forcing the GPs into thesis dilution. Specialist seed funds have been raising at half this size, but they pay for the focus by missing the next Ramp because it lived in the wrong category.
Finally, with the AI cycle showing every sign of producing power-law winners at the seed entry point, holding 10%+ ownership in 30 companies is structurally a better bet than holding 3% in 80. A* Fund III is engineered for that outcome.
The Team
Kevin Hartz is the highest-profile name on the masthead and the reason most LPs took the meeting. He co-founded Xoom, which PayPal acquired for $1.1 billion in 2015, and Eventbrite, which went public in 2018 at a peak market cap above $4 billion. He has been an active angel and seed investor for more than a decade, with stakes in PayPal-era network companies and a long bench of repeat founder relationships. Hartz publicly disclosed last fall that close to 20% of A*'s portfolio involved teenage founders, a stance very few institutional GPs are willing to take on the record.
Bennett Siegel is the under-the-radar half of the partnership and arguably the structural reason the firm works. He spent four years as a partner at Coatue Management before joining Hartz to launch A* in 2020, and before that worked at Altamont Capital Partners and Boston Consulting Group. Siegel's late-stage growth lens at Coatue is what gives A* an unusual ability to underwrite seed bets against scale-stage pattern data, which most pure-seed funds simply do not have.
Early Portfolio
A* is best known publicly for backing Ramp, the spend management fintech that has compounded into one of the highest-velocity B2B fintech outcomes of the past five years, and Mercor, the AI talent marketplace that has emerged as one of the most-funded AI-native companies of 2026. The 20% teenage-founder stat implies that a meaningful share of the rest of the portfolio is in similarly asymmetric early bets, including in AI applications and infrastructure where younger technical founders have an advantage.
What This Means for Founders
If you are a seed-stage founder targeting a $3 million to $5 million check with a single conviction-led lead, A* is now structurally one of the most attractive names in the market. The fund will deploy across 30 or so investments over two to three years, which means roughly 10 to 15 new investments per year, so the bar for cutting through is real but the slot count is meaningful. Hartz and Siegel write quickly and lead without needing a syndicate to validate the bet, which is rare at this size.
The value-add is most pronounced for founders who want a generalist lead that can scale ownership into Series A and B alongside growth funds, rather than a niche specialist. If you want a hands-on thematic partner with deep operator backing in your specific vertical, A* is probably not the right primary lead. If you want a clean ownership-driven seed partner that gives you 18 to 24 months of room to find product-market fit without forcing you into a thesis frame, A* is exactly engineered for that.
Fund Momentum Take
This is the cleanest version of the small-fund, high-ownership pitch in the 2026 market. The numbers are honest: $450 million, $3 million to $5 million checks, 30 companies, 10%+ ownership target. The math actually works, which is something we cannot say about most seed funds raising at $200 million to $500 million right now with $1 million checks and no portfolio cap.
The risks worth naming. A* has only two GPs of record, which is a real concentration of decision-making, and Siegel is still relatively newer to seed-stage primary sourcing compared to growth-stage diligence. The teenage-founder thesis is a public differentiator but also a real selection risk if the AI cycle compresses and operator credibility becomes more valuable than raw founder velocity. And the LP base, while sticky, is endowment- and foundation-heavy, which means slower decisions on Fund IV if performance softens.
Our bet. A* Fund III returns the fund off Ramp and Mercor alone, before the rest of the portfolio matures. The interesting question is whether Hartz keeps the next fund this small, or whether the gravitational pull of LPs asking to upsize finally wins. We would bet on the former, which is exactly why this fund is worth tracking.
Frequently Asked Questions
How big is A* Fund III and how does it compare to prior funds?
$450 million, versus $315 million for Fund II in 2024 and $300 million for Fund I in 2021. That is a 43% step-up over Fund II and a 50% step-up over Fund I, which is a disciplined ladder by 2026 standards.
Who runs A*?
Kevin Hartz, co-founder of Xoom and Eventbrite, and Bennett Siegel, formerly a partner at Coatue Management. The firm was founded in 2020.
What sectors does A* invest in?
Generalist by category. AI applications, fintech, healthcare, and security are the publicly named priorities, but A* underwrites across the entire early-stage technology stack.
What check size should I expect from A*?
Between $3 million and $5 million on average, with a target ownership of 10% or more and roughly 30 investments planned out of Fund III.
Who are the LPs in A* Fund III?
Endowments, foundations, and nonprofits, with Carnegie Mellon University publicly named as one of the institutional backers.
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