Ann Miura-Ko

Background

Ann Miura-Ko is a co-founding partner of Floodgate, one of Silicon Valley’s pioneering seed-stage venture capital firms ¹. She joined Mike Maples Jr. in 2008 to co-found the firm, which had been established as Maples Investments in 2006 ². The firm rebranded to Floodgate Fund in March 2010 ². In her first year at Floodgate, she gave birth to her second child and defended her PhD thesis six weeks later, while simultaneously making her first investment in TaskRabbit ³.

Miura-Ko grew up in Silicon Valley as the daughter of a NASA rocket scientist ⁴. She earned her BS in Electrical Engineering from Yale University in 1998 ⁴. While at Yale, she was a champion debater, placing first in the National Tournament of Champions and second in the State of California in high school debate competitions ⁴. She was also part of a five-person team that competed in the Robocup Competition in Paris ⁴.

She earned her PhD from Stanford University, where her dissertation focused on the mathematical modeling of computer security ¹⁴. Her technical background has shaped her reputation as a pioneer investor in highly technical companies ⁴.

Prior to Floodgate, Miura-Ko worked as a Senior Business Analyst at McKinsey & Company (1998-2001) and as an Analyst at Charles River Ventures (2001-2003) ⁶. She met Mike Maples serendipitously when he was starting a venture capital firm and invited her to be a co-founder ⁴.

At Stanford University, Miura-Ko is a lecturer in engineering, teaching courses on blockchain and intelligent growth strategies for startups ⁴. She is also co-director of the competitive Mayfield Fellows Program, which trains undergraduates to become technology leaders ¹⁴.

Miura-Ko is a co-founding member of All Raise, a nonprofit committed to improving diversity among venture capital funders and startup founders ¹⁴. She co-leads All Raise’s Founders for Change initiative, a group of more than one thousand venture-backed founders committed to improving diversity and inclusion ⁴. She served on the Yale Corporation Board of Trustees from 2019 to 2025 ¹⁵.

Forbes has called her “the most powerful woman in startups” ⁷. She is a repeat member of the Forbes Midas List (debuting at #77 in 2017) and was named to the New York Times Top 20 Venture Capitalists Worldwide ¹⁴⁸.

Stated Thesis

(Self-reported: These represent what Miura-Ko says publicly about her approach. See Inferred Thesis for analysis of actual investment behavior.)

Miura-Ko publicly describes her investment approach around several core concepts:

• Thunder Lizards: Her signature framework, shared with co-founder Mike Maples. She has described it as investing in “those fifteen companies that want to crawl across the pacific ocean and take over Tokyo and eat buildings and trains and generally disrupt markets. We are looking literally for Godzilla” ⁹.

• Co-conspirator, not investor: Miura-Ko frames her role as an active partner to founders rather than a passive capital provider. She has stated: “A great VC cares deeply about the company they’re partnering with; they’re a co-conspirator, not just an investor” ¹⁰.

• Uncovering secrets: She describes seed investing as backing people committed to discovering something new: “I’m always investing in a set of people who are committed to a process of uncovering secrets” and “These aren’t companies yet. They’re a set of insights — a development of a set of secrets” ¹⁰.

• Life’s work conviction: When evaluating founders, she asks: “Why is this your life’s work?” ⁷. She has said it matters when founders believe “in not starting that company, they would die a thousand deaths” ¹¹.

• Legacy investing: She has stated: “We invest in a company that I hope will have a legacy 30, 40, 50 years from now” ⁷.

• Upside over downside: Her investment philosophy emphasizes potential rather than risk mitigation: “You don’t become a better investor by figuring out all the ways something can go wrong. You become a better investor by figuring out how something can go right” ¹².

• Non-consensus bets: She has stated: “You make money by being non-consensus, finding unproven assets that people have under-valued, where you have proprietary information allowing you to value them correctly” ¹⁰.

She partners with only 3-5 founders per year with initial check sizes of $500K-$5M and a sweet spot of $2.5M ⁶¹³. She invests across most industries except biotech and deep tech ¹³.

Inferred Thesis

Based on 26 verified investments personally attributed to Ann Miura-Ko across multiple sources ^13691314:

Stage distribution: - Overwhelmingly pre-seed and seed stage, consistent with stated focus. All 26 verified investments were at seed or pre-seed stage ¹⁶. - Miura-Ko specializes in pre-product/market fit companies — she has over a decade of experience exclusively working with startups before they achieve product/market fit ¹¹³.

Sector concentration (of 26 verified personal investments): - Consumer & marketplaces: 9 of 26 (35%) — Lyft, TaskRabbit, Refinery29, ModCloth, Wanelo, Poparazzi, Popshop Live, Monthly, Emotive ^1391314 - Enterprise SaaS & security: 5 of 26 (19%) — Ayasdi, Xamarin, Okta, Merlin Labs, Loris.ai ³⁹¹⁴ - AI & machine learning: 5 of 26 (19%) — SmarterDx, Hebbia, Counsel Health, ReadyOn, Applied Intuition ¹¹¹ - Healthcare: 3 of 26 (12%) — SmarterDx, Counsel Health, Inscopix ¹¹¹ (SmarterDx counted in both AI and healthcare) - Climate & energy: 2 of 26 (8%) — Nirvana Energy Systems, Terradot ¹⁴ - Education: 2 of 26 (8%) — Thinkful, Maker Media ³¹³ - Other: 2 of 26 (8%) — Chloe and Isabel (fashion), JoyRun (delivery) ³⁹

Note: Some companies span multiple categories. Totals exceed 26 due to overlap (28 category assignments across 26 companies). This represents a subset of her investments through Floodgate; the firm’s full portfolio contains approximately 248 companies ².

Board service pattern: - Miura-Ko takes board seats at her highest-conviction investments. Current and former board seats include: Lyft (through 2023), TaskRabbit, Refinery29, Xamarin, Ayasdi, and Inscopix ³¹⁴.

Geography: - Heavily concentrated in San Francisco Bay Area and Silicon Valley ¹⁶.

Typical check size: - $500K-$5M range with a $2.5M sweet spot ⁶¹³. Earlier investments (2008-2012) used smaller checks of $500K-$1.8M (e.g., TaskRabbit seed round was $1.8M) ³¹⁵.

Founder profile patterns: - Strong affinity for technical founders — her PhD in computer security modeling gives her comfort with highly technical pitches ⁴¹¹. - Notable track record backing female founders: TaskRabbit (Leah Busque), Refinery29 (co-founded by Piera Gelardi and Philippe von Borries), ModCloth, Chloe and Isabel ³⁹. - Values founders with deep personal conviction and domain expertise over general entrepreneurial aspiration ⁹¹¹.

Co-investor patterns: - Strong syndicate relationships with Andreessen Horowitz (co-invested in Okta), Founders Fund (Series A in Lyft), and other tier-1 firms who lead follow-on rounds ²¹⁶.

Notable patterns diverging from stated thesis: - Stated thesis emphasizes contrarian bets that others dismiss, but several investments (Lyft, Okta, Applied Intuition) became consensus winners, suggesting her contrarian signal may be strongest at the very earliest stage before consensus forms. - Growing AI portfolio in recent years (SmarterDx, Hebbia, Counsel Health, ReadyOn) — though she has publicly expressed skepticism about AI hype timelines, stating “There’s so much hype about what ‘can be,’ but that ‘can be’ is more like 10-20 years away” ¹¹. - High pivot rate among portfolio successes — consistent with the broader Floodgate pattern where approximately 80% of exit profits came from companies that executed major pivots ².

Portfolio

This table includes 26 investments personally attributed to Ann Miura-Ko across multiple sources. Years marked with ~ are approximate, based on company founding dates when exact investment dates are not publicly confirmed. Miura-Ko’s investments are made through Floodgate, which has approximately 248 total portfolio companies ²; not all are individually attributed to her vs. Mike Maples or other partners.

In Their Own Words

“I’m always investing in a set of people who are committed to a process of uncovering secrets.” — Ann Miura-Ko, 20VC: The Lyft Memo ¹⁰

“These aren’t companies yet. They’re a set of insights — a development of a set of secrets.” — Ann Miura-Ko, 20VC: The Lyft Memo ¹⁰

“Putting your belief in someone who has nothing proven is really the essence of venture capital.” — Ann Miura-Ko, Deseret News interview, May 2021 ¹²

“You don’t become a better investor by figuring out all the ways something can go wrong. You become a better investor by figuring out how something can go right.” — Ann Miura-Ko, Deseret News interview, May 2021 ¹²

“I’m not an investor that has universal appeal. I’m a bit of a maniacal truth-teller.” — Ann Miura-Ko, Turpentine VC interview ¹⁰

“The point of venture is to invest in something that has the potential to really change how society acts within a particular area or change the nature of work itself.” — Ann Miura-Ko, Turpentine VC interview ¹⁰

“Not losing does not equal winning.” — Ann Miura-Ko, Turpentine VC interview ¹⁰

“I like doing things where people say, ‘That’s just kind of an idiotic move.’” — Ann Miura-Ko, Applied Intuition fireside chat, April 2025 ¹¹

“Where is the real value coming from, and which customers are going to use it? And why? That’s the real question we should be asking.” — Ann Miura-Ko, on AI investing, Applied Intuition fireside chat, April 2025 ¹¹

“If you return 3X of the invested capital regularly, you’re in the top 3% of investors.” — Ann Miura-Ko, Startup Grind interview ⁹

“The best entrepreneurs also don’t see obstacles — they see a path through those obstacles.” — Ann Miura-Ko, Startup Grind interview ⁹

“Greatness is a decision. It’s not something that just sort of happens.” — Ann Miura-Ko, Lean Startup Co. interview ⁷

“I think women are more likely to pitch a firm that has women — for better or for worse. My pitch to female founders is stop doing that — pitch everyone.” — Ann Miura-Ko, Fortune interview, February 2018 ¹⁶

“What I’ve always loved about Lyft is that the way they won is they played their own game.” — Ann Miura-Ko, Fortune interview, February 2018 ¹⁶

“You hear so often about investors making a bet on the entrepreneur, and I really believe in this case, it was just as much John and Logan taking a real bet on me.” — Ann Miura-Ko, on the early Lyft investment, Deseret News, May 2021 ¹²

What Founders Say

Entrepreneurs from TaskRabbit’s Leah Busque, Lyft’s John Zimmer, and Refinery29’s co-founders have praised Miura-Ko for understanding their vision before nearly anyone else ¹⁵. Specific independently sourced testimonials:

Qasar Younis, CEO of Applied Intuition, recounted that after their pitch meeting with Floodgate, Miura-Ko reached out immediately to offer a term sheet. Younis described her evaluation as focused on practical market entry: she praised the founders for being “zero-based about where the wedge would be, and then how you would grow out the business,” and told them their pitch “felt real. It felt like something you could capitalize on” ¹¹.

Ann Miura-Ko has described her first meeting with TaskRabbit founder Leah Busque as “love at first sight,” noting they found common ground in their computer science backgrounds and shared vision for the company. Miura-Ko led TaskRabbit’s $1.8M seed round ¹⁵. (Note: This characterization comes from Miura-Ko’s perspective; no independent Busque quote about Miura-Ko was found.)

Regarding Lyft co-founders John Zimmer and Logan Green, Miura-Ko has said: “John and Logan struck a lot of VCs as being too nice. But at the end of the day, that was a feature and not a bug. Without that… Lyft wouldn’t have been born” ¹⁶. She invested in Lyft when it was valued at $5 million as Zimride, and the investment returned nearly 10,000% ¹²¹⁶. (Note: This is Miura-Ko’s characterization of the founders; no independent Zimmer or Green quote about Miura-Ko was found.)

No additional independently sourced founder testimonials about working with Ann Miura-Ko were found despite dedicated searching across Twitter, podcast transcripts, and press coverage.

Sources