PROOF stands for the Pro Rata Opportunity Fund. We invest strategic capital alongside select early stage VC firms, to maximize upside in their best performing companies.
Venture capital firms investing in early stage companies typically negotiate ‘pro-rata investment rights,’ allowing them to maintain ownership in subsequent rounds of funding as they grow. Since early stage VCs invest across a broad swath of portfolio companies, over time, they inevitably run out of capital to maintain their pro-rata ownership in their best performing companies. When pro-rata is surrendered, board seats and the right to invest in future rounds are at stake.
Through our investments, we allow our network partner VCs to maintain their influence on the board, preserve their position in the cap table and optimize returns in companies experiencing meteoric growth.
Venture capital firms investing in early stage companies typically negotiate ‘pro-rata investment rights,’ allowing them to maintain ownership in subsequent rounds of funding as they grow. Since early stage VCs invest across a broad swath of portfolio companies, over time, they inevitably run out of capital to maintain their pro-rata ownership in their best performing companies. When pro-rata is surrendered, board seats and the right to invest in future rounds are at stake.
Through our investments, we allow our network partner VCs to maintain their influence on the board, preserve their position in the cap table and optimize returns in companies experiencing meteoric growth.
Location: United States, Virginia, Reston
Employees: 1-10
Founded date: 2015
Investment Type: Venture Capital
Investment Stage: Pre-Seed; Seed; Series A; Series B
Portfolio 93
| Date | Name | Website | Total Raised | Location |
| 11.08.2026 | Flagler He... | flaglerhealth.io | $50M | United Sta... |
| 19.02.2026 | Ownwell | ownwell.com | $55.75M | United Sta... |
| 08.01.2025 | Medable, I... | medable.com | $576M | United Sta... |
| 08.01.2025 | Jackpocket | jackpocket.com | $191M | United Sta... |
| 08.01.2025 | forage | joinforage.com | $22M | United Sta... |
| 08.01.2025 | Laurel | laurel.ai | $136.5M | United Sta... |
| 08.01.2025 | Heroes | makeheroes.co | $265.16M | - |
| 08.01.2025 | MasterClas... | masterclass.com | $455M | United Sta... |
| 08.01.2025 | Manticore ... | manticoregames.com | $160M | United Sta... |
| 08.01.2025 | ZERO | zerosystems.com | $12M | United Sta... |
Show more
Persons 6
| Date | First Name | Last Name | Title | Location | |||
| - | Thanasis | Delistathi... | CO-FOUNDER... | linkedin.c... | - | - | - |
| - | JOHN | BACKUS | CO-FOUNDER... | linkedin.c... | twitter.co... | - | - |
| - | JENNIFER | SCHRETTER | GENERAL PA... | linkedin.c... | - | - | - |
| - | Ha | Dao | ASSOCIATE | linkedin.c... | - | - | - |
| - | BRYAN | CIAMBELLA | General Pa... | linkedin.c... | - | - | - |
| - | JOHN | BURKE | CO-FOUNDER... | linkedin.c... | - | j****e@tru... | - |
Mentions in press and media 13
| Date | Title | Description |
| 16.08.2026 | Flagler Health Revolutionizes Musculoskeletal Care with AI | Flagler Health announced a $50 million Series B funding round. This capital boost targets the $400 billion musculoskeletal (MSK) care market. Its innovative AI operating system directly integrates into existing EMRs. The platform drasticall... |
| 11.08.2026 | Flagler Health raises $50M Series B to build the AI operating system for $400 billion musculoskeletal care market | Flagler Health has raised $50 million in Series B funding to tackle one of healthcare’s expensive but less visible problems: doctors spending much of their day doing work that has little to do with treating patients. The New York-based star... |
| 11.08.2026 | Flagler Health Receives $50M Series B Round | NEW YORK, NY, Flagler Health, an AI-native platform for musculoskeletal healthcare, today announced it raised a $50 million Series B, bringing total funding raised to $63 million. >> Click here for more funding data on Flagler Health... |
| 11.08.2026 | Flagler Health Raises $50M To Transform MSK Care With AI | Funding Backs AI-Powered MSK Care Flagler Health has raised $50 million in Series B funding to expand its AI-native platform for musculoskeletal healthcare. Bessemer Venture Partners led the round, with participation from SignalFire, Alumni... |
| 11.08.2026 | Flagler Health Raises $50M in Series B Funding | Flagler Health, a NYC-based provider of an AI-native platform for musculoskeletal (MSK) healthcare, raised $50M in Series B funding. The round was led by Bessemer Venture Partners with participation from SignalFire, Alumni Ventures, Streaml... |
| 11.08.2026 | Flagler Health Raises $50M to Build the AI Operating System for MSK Care | What You Should Know Flagler Health announced a $50M Series B funding round led by Bessemer Venture Partners, bringing its total capital raised to $63M. Additional round participants include SignalFire, Alumni Ventures, Streamlined, 186 Ven... |
| 23.02.2026 | Ownwell Secures $50 Million. Property Tax Relief Expands Nationally. | Ownwell, a leading property tax appeals platform, announced a $50 million Series B funding round. This brings its total capital to $74 million. The investment fuels national expansion. It supports new AI-powered tools for homeowners. These ... |
| 19.02.2026 | Ownwell Rises $50M in Series B Funding | Ownwell, an Austin, TX-based property tax monitoring and appeal services provider, raised $50M in Series B funding. The round included $30M in equity led by Alpha Edison and Mercato Partners, with participation from Intuit Ventures, Left La... |
| 19.02.2026 | Ownwell: $50 Million Series B Secured For Property Tax Appeals Platform | Ownwell, a property tax appeals platform focused on helping U.S. homeowners reduce their property tax bills, announced it has raised $50 million in Series B financing and launched a new National Appeals Packet to expand its services nationw... |
| 17.08.2022 | Narrating brand story across numerous media platforms lands $110 million for VidMob | Under increased pressure to maximise every marketing dollar, improving creative effectiveness and efficiency has become a marketing imperative. The need to execute a brand story across numerous media platforms and formats has made it increa... |
Show more