Investors / Phosphor Capital
Phosphor Capital
Venture capital
Phosphor Capital is an investment firm that invests in the top founders in each Y Combinator batch. It invests early and works closely with its portfolio companies.
Invests inAI & Machine Learning
In its own wordsy combinatorearly stagefounder supportpre-seedseed
Your fit with Phosphor Capital
Four questions about your startup
See how your round matches what it backs, point by point.
Or find every investor that fitsPhosphor Capital lists 38 checked portfolio companies on its own site and is named in 9 funding rounds. Its most frequent entry is Seed, 100% of the companies with a known first round. Its largest themes are AI & Machine Learning (39%), Enterprise Software (14%) and Fintech (8%). 92% of its companies are based in United States. It invests most often alongside Y Combinator, Transpose Platform and Eight Capital.
Counts come from funding rounds that name Phosphor Capital, complete from mid-2025: earlier rounds appear only when they were reported later. Round amounts and full round histories are on Fundup AI.
Round figures show recent activity, not Phosphor Capital's whole history. Rounds on record name 9 companies; its own site lists 38. Funding rounds are complete from mid-2025, so counts and the yearly trend undercount a firm that invested before then. The portfolio, themes and places come from its own site and are not affected.
Entry stage
share of companies by the stage of its first roundShow as a table
| Value | |
|---|---|
| Pre-seed | 0% |
| Seed | 100% |
| Series A | 0% |
| Series B | 0% |
| Growth | 0% |
Activity by year
rounds it joined, last 10 yearsShow as a table
| Total | Rounds it led | |
|---|---|---|
| '17 | 0 | 0 |
| '18 | 0 | 0 |
| '19 | 0 | 0 |
| '20 | 0 | 0 |
| '21 | 0 | 0 |
| '22 | 0 | 0 |
| '23 | 0 | 0 |
| '24 | 0 | 0 |
| '25 | 1 | 0 |
| '26 | 8 | 0 |
Investor profile
percentile among all firmsShow as a table
| Measure | Percentile of all firms | Value |
|---|---|---|
| Portfolio size | 76th | 38 companies |
| Recent activity | 93th | 8 rounds in 12 months |
| Early stage | 100th | 100% of entries at pre-seed or seed |
| Evidence | 56th | 3% of companies confirmed by a round |
| Sector focus | 72th | 39% in its largest sector |
| Reach | 70th | 4 countries |
Investment themes
share of its checked companiesThis firmAll checked companies
Show as a table
| This firm | All checked companies | |
|---|---|---|
| AI & Machine Learning | 39% | 18% |
| Enterprise Software | 14% | 8% |
| Fintech | 8% | 12% |
| Cybersecurity | 8% | 4% |
| Space & Defense | 6% | 3% |
| Healthcare & Biotech | 6% | 15% |
| Media & Entertainment | 4% | 4% |
| Education | 4% | 7% |
Invests most often with
firms sharing its portfolio companiesShow as a table
| Share | |
|---|---|
| Y Combinator | 35 |
| Transpose Platform | 13 |
| Eight Capital | 7 |
| Ritual Capital | 7 |
| Rice Capital | 6 |
| Lobster Capital | 5 |
| Pioneer Fund | 5 |
| BoxGroup | 4 |
Its portfolio companies
where they are based, and what their own sites showSite status
- Site answers38100%
- No longer answers00%
- Points to another company00%
- Parked or sold domain00%
A site that stops answering three checks in a row is counted as no longer answering; that is not proof of closure. A site that points to another company is often an acquisition.
Co-investor network
who it backs companies with, and who they back togetherCompare Phosphor Capital head to head
portfolio size, rounds, entry stages, themes and the companies both backThree or more firms at once: portfolio overlap.
Funds
as stated on its siteRecent portfolio activity
when companies last raised with Phosphor Capital| Date | Company | Stage |
|---|---|---|
| 14 Oct 2026 | Seed | |
| 26 May 2026 | Seed | |
| 16 Apr 2026 | Seed | |
| 1 Apr 2026 | Seed | |
| 10 Mar 2026 | Seed | |
| 17 Feb 2026 | Seed | |
| 8 Jan 2026 | Round | |
| 5 Jan 2026 | Seed |
Round details for Phosphor Capital
Amounts, full round histories and every co-investor in Phosphor Capital's rounds are on Fundup AI. VCinfo covers investors and their portfolios.
Portfolio
38 companies checked against their own sites| Company | What it does | Themes | First round with it | Evidence |
|---|---|---|---|---|
| Nexus creates self-operating procedures for businesses | Enterprise SoftwareAI & Machine Learning | Apr 2026Seed | Funding round | |
| The company provides an email inbox API for AI agents | AI & Machine LearningCybersecurity | Mar 2026Seed | Funding round | |
| The company provides an AI recruiter platform for hiring and interviewing candidates. | AI & Machine LearningHuman Resources | Portfolio page | ||
| Andon Labs develops and deploys artificial intelligence to run and grow real businesses autonomously | AI & Machine LearningRobotics & Hardware | Portfolio page | ||
| The company provides a serverless runtime for intelligence, allowing users to run code on demand and share data across their stack. | AI & Machine LearningSpace & Defense | Portfolio page | ||
| Autosana provides AI testing for iOS, Android, and web apps to help companies ship faster | AI & Machine LearningCybersecurity | Feb 2026Seed | Funding round | |
| Circleback provides an AI-powered notetaker and automation tool for meetings and conversations. | AI & Machine LearningSpace & Defense | Portfolio page | ||
| Corgi provides insurance to startups and other businesses | FintechAI & Machine Learning | Jan 2026Round | Page + round | |
| Crustdata indexes every web page on the internet and parses it into one live graph of people and companies, available via API or MCP. | AI & Machine LearningEnterprise Software | Portfolio page | ||
| Deepnight makes cameras effective in dark environments, achieving higher performance at lower costs than thermal cameras | AI & Machine LearningAI & Machine Learning | Portfolio page | ||
| Didit is a full-service marketing agency that offers various services including paid search, social media, SEO, and direct mail | Media & EntertainmentEducation | Portfolio page | ||
| The company provides an API for identity and fraud services, including authentication, verification, and monitoring. | FintechCybersecurity | May 2026Seed | Funding round | |
| The company designs and manufactures custom circuit boards with AI | Robotics & Hardware | Portfolio page | ||
| Domu handles conversations related to debt collection and payment completion for financial institutions. | FintechDeveloper Tools | Portfolio page | ||
| Fazeshift develops AI agents for automating accounts receivable processes. | FintechAI & Machine Learning | Portfolio page | ||
| Greenboard provides compliance software for securities companies | FintechAI & Machine Learning | Portfolio page | ||
| Gumloop builds AI agents for work | AI & Machine LearningEnterprise Software | Portfolio page | ||
| Harper provides business insurance services, including various types of liability insurance and other coverage options, to different industries | FintechIndustrial & Manufacturing | Portfolio page | ||
| Henry automates underwriting, pitch decks, and comps research for commercial real estate teams. | Real Estate & ConstructionAI & Machine Learning | Portfolio page | ||
| The company provides a workspace for AI agent teams to work together on business goals. | AI & Machine LearningEnterprise Software | Apr 2026Seed | Funding round |
About this data
site last read 6 Nov 2026- Site
- phosphorcap.com
- Last read
- 6 Nov 2026
- Watching since
- 6 Nov 2026
- Rounds since
- 17 Nov 2025
- Companies checked
- 38
Rates come from what VCinfo has observed since observation_start. Firms tend to remove companies that closed, so early rates understate reality. A company leaving a portfolio page does not mean it closed or exited. An unreachable site means our checks failed, nothing more.
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