William Ackman
Chairman & CEO @ Pershing Square Tontine Holdings
New York, United States
William Ackman is a Series A investor at Pershing Square Tontine Holdings in New York focused on Software and FinTech. William Ackman is the founder and CEO of Pershing Square Capital Management. He attended Harvard Business School.
- Total investments:
- 30
- Last investment:
- Lead investor:
- 13%
Last updated:
For AI agents: llms.txt
Industries William Ackman invests in
Stages William Ackman invests in
Countries William Ackman invests in
Round sizes
Round size
- Seed
- $1M–$20M
- Series A
- $10M–$33M
- Venture - Series Unknown
- $20M–$200M
Investment Focus
Industry
- Software 6 (20%)
- FinTech 4 (13%)
- Financial Services 4 (13%)
- Information Technology 4 (13%)
- Logistics 3 (10%)
Stage
- Series A 9 (30%)
- Seed 5 (17%)
- Venture - Series Unknown 5 (17%)
- Series B 3 (10%)
- Post-IPO Equity 2 (7%)
Country
- United States 19 (63%)
- Israel 3 (10%)
- Canada 1 (3%)
- Switzerland 1 (3%)
- United Kingdom 1 (3%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Kela Technologies
|
Kela Technologies is a secure, open platform that enables the rapid and seamless integration of commercial and military systems in support of Western defense. | $200M / Venture - Series Unknown / May 05, 2026 | |
Outtake
|
Outtake provides agentic AI cyber defense through the use of AI agents for automated response, real-time classification, and advanced threat detection. In order to combat fraud and impersonation, it focuses on open-source intelligence, multi-surface anti-phishing, and digital identity protection. | $40M / Series B / Jan 28, 2026 | |
|
Outtake
|
Outtake provides agentic AI cyber defense through the use of AI agents for automated response, real-time classification, and advanced threat detection. In order to combat fraud and impersonation, it focuses on open-source intelligence, multi-surface anti-phishing, and digital identity protection. | $16.5M / Series A / Apr 10, 2025 | |
Uber
|
Uber develops, markets, and operates a ridesharing mobile application that allows consumers to submit a trip request that is routed to crowd-sourced partner drivers.Its smartphone application connects drivers with people who need a ride. Its application enables users to arrange and schedule transportation and/or logistics services withthird-party providers. They take on big problems to help drivers, riders, delivery partners, and eaters get moving in more than 600 cities around the world. It also provides Windows Phone App, iPhone App, Blackberry App, and Android App. Uber serves customers in North, Central, and South Americas as well as Europe, the Middle East, Africa, and the Asia PacificGarrett Camp, Oscar Salazar, and Travis Kalanick founded UberCab in March 2009 which became Uber Technologies in October 2010, with its headquarters in San Francisco California, and an engineering center in Bengaluru in India as well as a regional office in Singapore. | $2.3B / Post-IPO Equity / Jan 01, 2025 | |
Better Health
|
Better Health is a support and supplies platform built on peer-to-peer connection. The supported chronic conditions include ostomy, chronic wounds, diabetes, chronic retention, and incontinence. Better Health is trusted by healthcare payers and providers to deliver peer support, education, and medical supplies to drive engagement and adherence,improve outcomes, and lower the cost of care. The result is reduced overutilization, improved mental health, and a 98% customer satisfaction rating. Co-founded by Naama Stauber Breckler and Adam Breckler, Better Health operates in 48 states and serves the members of top payers, including Medicare, Medicaid, Cigna, Humana, Florida Blue, and Oscar, among others. To learn more, visit joinbetter.com. | $14M / Series A / Jun 13, 2024 | |
Tel Aviv Stock Exchange
|
Established in September 1953, the Tel Aviv Stock Exchange (TASE) is an efficient one-stop shop for the securities industry, hosting an increasingly sophisticated range of products to investors, including shares, corporate bonds, treasury bills and bonds, index-tracking products and derivatives on shares, indices and currency exchange rates.TASE is a fully automated exchange with a central order book trading system, providing clearing, settlement and depository services. Supervised by the Israel Securities Authority, it is a regulated market. The TASE is an internationally recognized exchange and is a member of the World Federation of Exchanges (WFE), an observer member of the Federation of European Stock Exchanges (FESE) and an affiliate member of the International Organization of Securities Commissions (IOSCO). The TASE Web site (www.tase.co.il) offers extensive market data as well as vital information on Israel's capital markets. | $65.3M / Post-IPO Secondary / Jan 24, 2024 | |
|
Better Health
|
Better Health is a support and supplies platform built on peer-to-peer connection. The supported chronic conditions include ostomy, chronic wounds, diabetes, chronic retention, and incontinence. Better Health is trusted by healthcare payers and providers to deliver peer support, education, and medical supplies to drive engagement and adherence,improve outcomes, and lower the cost of care. The result is reduced overutilization, improved mental health, and a 98% customer satisfaction rating. Co-founded by Naama Stauber Breckler and Adam Breckler, Better Health operates in 48 states and serves the members of top payers, including Medicare, Medicaid, Cigna, Humana, Florida Blue, and Oscar, among others. To learn more, visit joinbetter.com. | $14M / Series A / Jul 01, 2023 | |
Bremont
|
Bremont is a manufacturer of watches providing an online store with a wide range of designer watches and accessories. | $59.9M / Venture - Series Unknown / Jan 23, 2023 | |
CPKC
|
Canadian Pacific provides customers with a rail service with access to key markets in every corner. They also offer intermodal and rail transportation services. They have warehouses, container handling equipment, and terminals with on-dock rail infrastructure. They offer rail services for sectors including those in the automotive, coal, energy,ethanol, fertilizer and potash, forest products, grain, and industrial products. | Post-IPO Equity / Nov 14, 2022 | |
Winners Alliance
|
Winners Alliance provides services for sports licensing programs that are aimed at helping athletes. Professional athletes train aspiring athletes through the company's sports program, which also includes trading cards, collectibles, and video games. This helps the athletes improve both on and off the field. | $26M / Venture - Series Unknown / Aug 16, 2022 | |
| See all 30 investments → | |||
Co-Investors
About Pershing Square Tontine Holdings
Pershing Square Tontine Holdings Contacts
| Name | Phone | Socials | |
|---|---|---|---|
|
William Ackman
Chairman & CEO
|
|||
4 more contacts available
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FAQ
What does William Ackman invest in?
William Ackman invests primarily in Software, FinTech and Financial Services startups, most often at Series A and Seed stage. Most of the 30 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is William Ackman's check size?
William Ackman typically joins rounds of $1M–$20M at Seed, $10M–$33M at Series A and $20M–$200M at Venture - Series Unknown. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds William Ackman participates in.
When did William Ackman last invest?
The most recent investment recorded for William Ackman closed in May 2026. Shizune tracks 30 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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