Sarah Friar

Chief Financial Officer, OpenAI (angel investor) at openai

Reviewed Updated Jul 21, 2026

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Location San Francisco, California
Check Size $5K-$50K (angel checks; $25K typical)
Last Verified Investment MedAll (Seed) — Jan 5, 2022
Social LinkedIn
Stage Focus
seed series-a series-b
Sector Focus
fintech developer-tools healthtech marketplaces consumer

Background

Sarah Friar is Chief Financial Officer of OpenAI, a role she has held since June 2024 1. She joined OpenAI after six years as CEO of Nextdoor (2018-2024), which she took public in 2021 (NYSE:KIND) 23. Before Nextdoor she was CFO of Square (now Block) from 2012 to 2018, leading the company’s 2015 IPO 23. Earlier in her career she was SVP of Finance & Strategy at Salesforce, a Managing Director in Equity Research at Goldman Sachs, and began her career as a consultant at McKinsey in London and South Africa 34.

Friar earned an MEng in Metallurgy, Economics, and Management from the University of Oxford and an MBA from the Stanford Graduate School of Business, where she was an Arjay Miller Scholar 4. She was granted an OBE by Queen Elizabeth II in 2019 for services to entrepreneurship 4, and she co-founded the nonprofit Ladies Who Launch 4.

Friar currently sits on the board of Walmart (joined 2018; chairs the Technology and eCommerce Committee) and ConsenSys, is a trustee of Stanford University, and serves on the advisory boards of Operation HOPE, the Blavatnik School of Government at Oxford, and the Stanford Digital Economy Lab 34. Prior board seats include Slack Technologies (2017-2021), New Relic (2013-2018), and three Dragoneer Growth Opportunities SPACs 5.

Stated Thesis

Friar does not publish a formal angel-investing thesis. In podcast interviews about her operating career, she has said she is drawn to investing time and capital in businesses that combine commercial ambition with purpose. On Bessemer Venture Partners’ Wish I Knew podcast, she has discussed why “strong conviction in a market thesis can buoy you through hard times” and why founders should never assume it is a bad time to raise money 6. In a 2022 interview she described her leadership stance as “people first” and said her mantra is to hire well and give people “autonomy, encouragement, and tough love” 7.

Inferred Thesis

Based on 6 independently verified angel investments between 2020 and 2022, patterns emerge — though the sample is small and inferences should be treated as directional:

  • Fintech and payments dominate: Bond Financial Technologies (banking-as-a-service, 2020) 8, Step Mobile (teen banking, 2021) 9, and UNIPaaS (embedded payments for marketplaces, 2021) 10 — 3 of 6 confirmed rounds. This aligns with her CFO tenure at Square.
  • Northern Ireland / UK diaspora: MedAll (Belfast healthtech, 2022) 11 and Cloudsmith (Belfast developer tools, 2021) 12 reflect ties to her home region.
  • Co-investment with alumni networks: Alongside former Square colleagues (Gokul Rajaram appears in UNIPaaS and Step rounds; Jacqueline Reses appears in Step) 910, and other operator-angels (Eric Yuan, Ryan Petersen in Bond) 8.
  • Later-stage angel participation: 4 of 6 verified rounds are Series A or later, unusual for a pure angel — reflects her senior operator profile giving her access to already-priced growth rounds.
  • Sector spread: fintech (3), developer infrastructure (1), healthtech (1), real-estate marketplace (1). Not a specialist thesis.
  • Check size: NFX Signal characterizes her sweet spot as $25K, range $5K-$50K 13. Individual round sizes she participates in range from ~$3M to $100M+.

Friar is also an LP in Tapestry VC Fund III (announced July 2026), which focuses on European repeat founders 14.

Portfolio

Company Year Stage Source
Bond Financial Technologies 2020 Series A (Coatue led) 8
UNIPaaS 2021 Seed (TPY Capital led) 10
Belong 2021 Series B (Battery Ventures led) 15
Step Mobile 2021 Series C (General Catalyst led) 9
Cloudsmith 2021 Series A (Tiger Global led) 12
MedAll 2022 Seed (Connect Ventures led) 11

In Their Own Words

On what makes Nextdoor different from other social platforms:

“For me, one of the things that really shines about Nextdoor is how positive the platform is versus a lot of other things that we interact with on the internet.” — Sarah Friar, Entrepreneur, 2020 7

On measuring what matters:

“For example, if we have 10 new neighbors on our platform, is that good? Bad? Numbers without context are dangerous.” — Sarah Friar, Entrepreneur, 2020 7

On diversity:

“Diversity should be a business imperative.” — Sarah Friar, Entrepreneur, 2020 7

On career reflection:

“I would tell myself to not feel like I have to fulfill the mold of what people around me wanted me to do.” — Sarah Friar, Entrepreneur, 2020 7

What Founders Say

No independently sourced founder testimonials about Sarah Friar as an angel investor were found during research. Public funding announcements name her as a participating investor but do not include quotes from portfolio-company founders about the working relationship.

Sources

  1. OpenAI, “OpenAI welcomes CFO and CPO,” June 2024. https://openai.com/index/openai-welcomes-cfo-cpo/↩

  2. Walmart Corporate, “Sarah Friar - Board of Directors,” accessed July 2026. https://corporate.walmart.com/about/board-of-directors/sarah-friar↩↩

  3. Stanford Digital Economy Lab, “Sarah Friar,” accessed July 2026. https://digitaleconomy.stanford.edu/person/sarah-friar/↩↩↩↩

  4. Ladies Who Launch, “About Sarah,” accessed July 2026. https://www.ladieswholaunch.org/about-sarah↩↩↩↩↩

  5. LinkedIn, Sarah Friar profile summary (via public snippet), accessed July 2026. https://www.linkedin.com/in/sarah-friar/↩

  6. Bessemer Venture Partners, “Wish I Knew podcast — Sarah Friar,” accessed July 2026. https://www.bvp.com/wish-i-knew↩

  7. Entrepreneur, “12 Leadership Lessons from Nextdoor CEO Sarah Friar,” 2020. https://www.entrepreneur.com/leadership/12-leadership-lessons-from-nextdoor-ceo-sarah-friar/357817↩↩↩↩↩

  8. PR Newswire, “Bond Raises $32M Series A,” July 15, 2020. https://www.prnewswire.com/news-releases/bond-raises-32m-series-a-301094048.html↩↩↩

  9. Step, “Step Raises $100 Million in Series C Funding,” April 27, 2021. https://step.com/press/step-raises-100-million-in-series-c-funding-and-surpasses-1-5-million-users↩↩↩

  10. PR Newswire, “UNIPaaS raises $10M seed round,” February 9, 2021. https://www.prnewswire.com/il/news-releases/unipaas-a-new-fintech-venture-raises-10m-seed-round-to-build-a-payments-solution-for-digital-marketplaces-and-b2b-saas-companies-843209944.html↩↩↩

  11. RTÉ News, “MedAll raises $3.4m to train healthcare professionals,” January 5, 2022. https://www.rte.ie/news/business/2022/0104/1269824-medall-raises-3-4m-to-train-healthcare-professionals/↩↩

  12. TechCrunch, “Software supply chain platform Cloudsmith raises $15M Series A led by Tiger Global,” September 22, 2021. https://techcrunch.com/2021/09/22/software-supply-chain-platform-cloudsmith-raises-15m-series-a-led-by-tiger-global/↩↩

  13. Signal by NFX, “Sarah Friar’s Investing Profile,” accessed July 2026. https://signal.nfx.com/investors/sarah-friar↩

  14. Silicon Republic, “OpenAI’s Sarah Friar among backers of Tapestry VC’s new ‘repeat founder’ $80m Fund III,” July 2026. https://www.siliconrepublic.com/start-ups/open-ais-sarah-friar-among-backers-of-tapestry-vcs-new-repeat-founder-80m-fund-iii↩

  15. Belong, “Announcing Belong’s $5M Series Seed, $10M Series A and $40M Series B from a16z, GGV and Battery Ventures,” March 2021. https://belonghome.com/blog/series-seed-a-and-b-now-hiring↩