# SOSV: portfolio, investments and team

> SOSV is a vc firm based in United States. 950 investments on record, 73 in the last 12 months, latest Oct 2026. Portfolio, stages, co-investors and team.

Source: https://millionrounds.com/fund/sosv (Millionrounds; every figure on the page links to its filing or article)

United States · [Investor](https://millionrounds.com/investors)

# SOSV

Last cheque observed Oct 2026; 950 cheques on record.

Email

Deploying now New fund $7.0M, Jun 2026 VC firm

Pre-seed Psychedelic Protein Tech-enabled Health

Follow SOSV and see its new cheques in your feed. [Start following](https://millionrounds.com/login?join=1&why=follow&next=%2Ffund%2Fsosv)

Deploying now

**57%** of best year **73** **cheques in 12 months**, 950 on record

Since the last cheque **16** days **00** hrs **00** min **00** sec

Median round **$2.5M** Cheque size, as they say **$250K – $525K** Rounds led **2 of 950** Sole investor **263 rounds** Exits **11 from the portfolio** Mostly in **United States, 71%**

Pitch SOSV

## SOSV highlights

- 01 73 cheques in the last 12 months
- 02 Mostly Venture and Seed: 83% of its rounds
- 03 Sole investor in 263 rounds, median $715K
- 04 11 exits from the portfolio

## What they do

> SOSV is the world’s most active deep tech venture capital firm investing at pre-seed From their own website

- **Type:** VC firm (from a list, unverified)
- **Cheque size:** $250K – $525K as they say
- **Stages:** Pre-seed
- **Sectors:** Psychedelic Protein Tech-enabled Health
- **Based in:** New York, United States
- **Cold pitches:** Not stated

## The record

Every round we can evidence, newest first **950 appearances**

- **2026** 55 rounds
- **Oct** **[Metabolize](https://millionrounds.com/company/metabolize)** Seed · US · PR Newswire: financing agreements **$3.2M** With 3 others
- **Oct** **[Blaze Energy](https://millionrounds.com/company/blaze-energy)** Seed · US · HAX **$6.5M** With 6 others
- **Sept** **[Zenithon AI](https://millionrounds.com/company/zenithon-ai)** Seed · GB · Firms' own news pages **$10M** With 5 others
- **Sept** **[Mesa Quantum](https://millionrounds.com/company/mesa-quantum)** Series A · US · HAX **$12M** With 3 others
- **Sept** **[Cradlewise](https://millionrounds.com/company/cradlewise)** Series A · US **$12M** With 3 others
- **Sept** **[Nascent Materials](https://millionrounds.com/company/nascent-materials)** Grant · US **$2.3M** With 2 others
- **Sept** **[Atlantic Fish Company](https://millionrounds.com/company/atlantic-fish-company)** Grant · US **$75K** With 2 others
- **Sept** **[Tru](https://millionrounds.com/company/tru)** Venture **$1.3M** Sole investor
- **Aug** **[Princeton Critical Minerals](https://millionrounds.com/company/princeton-critical-minerals)** Series A · US · HAX **$16M** *Led*
- **Aug** **[California Perovskite Technology](https://millionrounds.com/company/california-perovskite-technology)** Seed · US **$2.1M** Sole investor
- **Aug** **[Princeton Critical Minerals](https://millionrounds.com/company/princeton-critical-minerals)** Grant **$5.0M** With 2 others
- **Jul** **[Sodex Innovations](https://millionrounds.com/company/sodex-innovations)** Series A · AT · Look AI Ventures **$4.6M** With 5 others
- **Jul** **[BugBiome](https://millionrounds.com/company/bugbiome)** Grant · GB **$672K** With 2 others
- **Jul** **[Arculus Solutions](https://millionrounds.com/company/arculus-solutions)** Seed · US **$2.0M** With 2 others
- **Jul** **[InnSight Technology](https://millionrounds.com/company/innsight-technology)** Grant · US **$515K** With 3 others
- **Jul** **[Rybodyn](https://millionrounds.com/company/rybodyn)** Seed · US **$10M** With 1 other
- **Jul** **[Tidal Vision](https://millionrounds.com/company/tidal-vision)** Debt · US **$19M** With 1 other
- **Jul** **[Sharper Sense](https://millionrounds.com/company/sharper-sense)** Grant · US **$100K** With 3 others
- **Jun** **[CroíValve](https://millionrounds.com/company/croivalve)** Series B · IE **$20M** With 4 others
- **May** **[XFuel](https://millionrounds.com/company/xfuel)** Grant · IE **$4.8M** With 3 others
- **Apr** **[Aspect Aerospace](https://millionrounds.com/company/aspect-aerospace)** Grant · US **$1.9M** Sole investor
- **Apr** **[Fermeate](https://millionrounds.com/company/fermeate)** Seed · US **$2.5M** With 2 others
- **Apr** **[NOC Energy](https://millionrounds.com/company/noc-energy)** Seed · US · HAX **$2.7M** With 4 others
- **Apr** **[DeepSpin](https://millionrounds.com/company/deepspin)** Grant · DE **$2.6M** With 4 others
- **Apr** **[Pheronym](https://millionrounds.com/company/pheronym)** Grant · US **$378K** With 3 others
- **Mar** **[Weego](https://millionrounds.com/company/weego)** Seed · MA · Disrupt Africa **$1.1M** With 2 others
- **Mar** **[Alora](https://millionrounds.com/company/alora)** Venture · US **Undisclosed** With 1 other
- **Mar** **[PONS](https://millionrounds.com/company/pons)** Venture · US **Undisclosed** With 1 other
- **Mar** **[Surf Therapeutics](https://millionrounds.com/company/surf-therapeutics)** Seed · US **$6.0M** With 2 others
- **Mar** **[VALANX Biotech](https://millionrounds.com/company/valanx-biotech)** Venture · AT **$3.5M** Sole investor
- **Mar** **[BioLattice](https://millionrounds.com/company/biolattice)** Seed · US **$575K** Sole investor
- **Mar** **[TippingPoint Biosciences](https://millionrounds.com/company/tippingpoint-biosciences)** Seed · US **$4.5M** With 1 other
- **Mar** **[Preemadonna](https://millionrounds.com/company/preemadonna)** US **$500K** With 4 others
- **Mar** **[Cauldron Ferm](https://millionrounds.com/company/cauldron-ferm)** Series A · AU **$13M** With 3 others
- **Mar** **[Flair](https://millionrounds.com/company/flair)** Series B · US **$5.7M** With 2 others
- **Mar** **[Cocoon](https://millionrounds.com/company/cocoon)** Series A · US **$15M** With 2 others
- **Mar** **[Qnetic](https://millionrounds.com/company/qnetic)** Seed · US **$5.0M** With 1 other
- **Mar** **[SEQUENTIAL](https://millionrounds.com/company/sequential)** Seed · GB **$3.5M** With 3 others
- **Feb** **[FLOWN](https://millionrounds.com/company/flown)** Seed · GB **$294K** With 2 others
- **Feb** **[AvantGuard](https://millionrounds.com/company/avantguard)** Venture · US **Undisclosed** With 2 others

An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.

## The team

Named by the firm itself, on a filing, its Form ADV or its company registration **3 named**

SO **Sean O'Sullivan** Director of the General Partner of the General Partner of the Primary Issuer and Senior Partner of the General Partner of the Additional Issuer i Filing they signed

SO **Sean O'Sulllivan** MANAGING MEMBER i Filing they signed

SJ **Stephen John Mccann** Chief Financial Officer i Form ADV

We also hold **77** people at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.

## What the register says

From the firm's own filings with the SEC, which it must file accurately by law

**$1.3B** gross assets of its funds Oct 2026

**4+** funds on file numbered funds in its name

**Exempt** reporting adviser venture or small private funds

- **Legal name:** SOSV Investments LLC
- **SEC number:** CRD 284976

## What they claim to have backed

From their own portfolio page (on their website)

**0** of 1 we have independently watched raise

Sosvdeeptech

Weaker than a round we watched, stronger than a list somebody sold us. A firm is far less willing to put a company on its own site that it never funded.

## Exits from the portfolio

Companies it backed that were later bought or listed **11 in all**

**[Dispatch](https://millionrounds.com/company/dispatch)** Bought by [Amazon](https://millionrounds.com/fund/amazon) **Undisclosed** Nov 2017

**[Splitforce](https://millionrounds.com/company/splitforce)** Bought by Localytics **Undisclosed** Apr 2015

**[Melon](https://millionrounds.com/company/melon)** Bought by DAQRI **Undisclosed** Feb 2015

**[Clarity](https://millionrounds.com/company/clarity)** Bought by [Fundable](https://millionrounds.com/fund/fundable) **Undisclosed** Feb 2015

**[Global Protein Solutions](https://millionrounds.com/company/global-protein-solutions)** Bought by Meatco **Undisclosed** Mar 2014

**[Collaborate.com](https://millionrounds.com/company/collaborate-com)** Bought by [Cisco](https://millionrounds.com/fund/cisco) **Undisclosed** Dec 2013

**[Mapflow](https://millionrounds.com/company/mapflow)** Bought by [LexisNexis](https://millionrounds.com/fund/lexisnexis) **Undisclosed** Sept 2013

**[play140](https://millionrounds.com/company/play140)** Bought by Oomba **$270K** Apr 2012

**[Harmonix Music Systems](https://millionrounds.com/company/harmonix-music-systems)** Bought by [MTV](https://millionrounds.com/fund/mtv) **$175M** Sept 2006

**[Genetic Anomalies](https://millionrounds.com/company/genetic-anomalies)** Bought by THQ **$8.0M** Dec 1999

**[Arris Networks](https://millionrounds.com/company/arris-networks)** Bought by Cascade Communications **$145M** May 1996

An exit counts when it came after the firm's first round in the company. From historical deal records.

New fund on file

**$7.0M**

raised in Jun 2026

From its SEC filing, not a journalist: a firm that has just raised has money to deploy.

## The cheque

Pre-seed

Median round joined **$2.5M** the round, not its cheque Alone, median **$715K**

Led 2 of 950 rounds **0%**

- **Said size:** $250K – $525K
- **Sole investor:** 263 rounds
- **Last cheque:** Oct 2026
- **Exits:** 11 from the portfolio

Rounds by stage said on their site

- Venture *381*
- Seed *332*
- Series A *65*
- Grant *47*
- Pre-seed said *31*

Cheques by month Led Joined

Nov 2023 Oct 2026

Often in the room with

- [HAX](https://millionrounds.com/fund/hax) 100
- [Orbit Ventures](https://millionrounds.com/fund/orbit-ventures) 89
- [Chinaccelerator](https://millionrounds.com/fund/chinaccelerator) 57
- [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) 42
- [Artesian VC](https://millionrounds.com/fund/artesian) 31
- [HAXLR8R](https://millionrounds.com/fund/haxlr8r) 25

**Pitching SOSV?** Put them on your fundraising board with this record on the card, and follow them to hear when they write a new cheque.

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## Who they invest alongside

The investors most often in the same rounds as SOSV. A count of rooms they were both in, not a relationship either has claimed.

[**HAX** Accelerator **100** rounds together](https://millionrounds.com/fund/hax)[**Orbit Ventures** VC firm **89** rounds together](https://millionrounds.com/fund/orbit-ventures)[**Chinaccelerator** Accelerator **57** rounds together](https://millionrounds.com/fund/chinaccelerator)[**National Science Foundation** Government **42** rounds together](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno)[**Artesian VC** Asset manager **31** rounds together](https://millionrounds.com/fund/artesian)[**HAXLR8R** VC firm **25** rounds together](https://millionrounds.com/fund/haxlr8r)[**Plug and Play** Accelerator **17** rounds together](https://millionrounds.com/fund/plug-and-play)[**500 Global** Angel **16** rounds together](https://millionrounds.com/fund/500-startups)[**Entrepreneur First** Accelerator **16** rounds together](https://millionrounds.com/fund/entrepreneurs-first)[**Creative Destruction Lab** Accelerator **15** rounds together](https://millionrounds.com/fund/creative-destruction-lab)[**IndieBio** Accelerator **14** rounds together](https://millionrounds.com/fund/indiebio)[**Gaingels** Private equity **13** rounds together](https://millionrounds.com/fund/gaingels)

## Recently backed

The latest companies SOSV put money into.

[**Mesa Quantum** $12M · Sept 2026](https://millionrounds.com/company/mesa-quantum)[**Cradlewise** $12M · Sept 2026](https://millionrounds.com/company/cradlewise)[**Nascent Materials** $2.3M · Sept 2026](https://millionrounds.com/company/nascent-materials)[**Tru** $1.3M · Sept 2026](https://millionrounds.com/company/tru)[**Princeton Critical Minerals** $16M · Aug 2026](https://millionrounds.com/company/princeton-critical-minerals)[**California Perovskite Technology** $2.1M · Aug 2026](https://millionrounds.com/company/california-perovskite-technology)

## On podcasts

4 episodes naming SOSV in the title, and 4 more that mention it.

- [Inevitable](https://millionrounds.com/podcasts/inevitable) 22 Feb 2024 · 55 min Exploring Material Science Startups with SOSV Mentions [SOSV](https://millionrounds.com/fund/sosv)[Po Bronson](https://millionrounds.com/person/po-bronson) Apple PodcastsShow page
- [Inevitable](https://millionrounds.com/podcasts/inevitable) 7 Mar 2022 · 51 min Ep. 199: Sean O'Sullivan, Managing Director & Founder of SOSV With [Sean O'Sullivan](https://millionrounds.com/person/sean-o-sullivan) Mentions [SOSV](https://millionrounds.com/fund/sosv) Apple PodcastsShow page
- [Capital Allocators](https://millionrounds.com/podcasts/capital-allocators) 17 Jan 2022 · 50 min Sean O'Sullivan – Start-up Development at SOSV, Venture is Eating the Investment World 3 (Capital Allocators, EP.231) With [Sean O'Sullivan](https://millionrounds.com/person/sean-o-sullivan) Mentions [SOSV](https://millionrounds.com/fund/sosv) Apple PodcastsShow page
- [This Week in Startups](https://millionrounds.com/podcasts/this-week-in-startups) 13 May 2020 · 1h 5m E1059: The Power of Accelerators E4 Sean O'Sullivan, Managing General Partner of SOSV on running capital intensive accelerators in hardware, life sciences & food science, unique follow-on strategy, cell-based meat going mainstream, China-based vs. US-ba With [Sean O'Sullivan](https://millionrounds.com/person/sean-o-sullivan) Mentions [SOSV](https://millionrounds.com/fund/sosv) Apple PodcastsShow page

### Mentioned in

- [Scaling Europe](https://millionrounds.com/podcasts/scaling-europe) 30 Sept 2026 · 20 min Alex Higginbottom, Founder at Zenithon AI: BREAKING: Zenithon AI raised $10m Apple PodcastsShow page
- [Inevitable](https://millionrounds.com/podcasts/inevitable) 16 Jan 2025 · 34 min Circular Solutions for Heavy Industry with Cocoon Apple PodcastsShow page
- [Inevitable](https://millionrounds.com/podcasts/inevitable) 16 Jan 2023 · 23 min David Kirtley, Helion Energy Apple PodcastsShow page
- [Inevitable](https://millionrounds.com/podcasts/inevitable) 2 Dec 2021 · 26 min Startup Series: Boston Metal Apple PodcastsShow page

## Quick answers about SOSV

### What does SOSV invest in?

SOSV invests most often at Venture and Seed (83% of the rounds on record), in sectors such as Psychedelic, Protein and Tech-enabled Health.

### How active is SOSV?

950 investments on record, 73 of them in the last 12 months, and it led 2. The most recent was in Oct 2026.

### What has SOSV invested in recently?

Its most recent investments on record: Metabolize (Seed, Oct 2026), Blaze Energy (Seed, Oct 2026) and Zenithon AI (Seed, Sept 2026).

### How big are SOSV's cheques?

The median round it joins is $2.5M. It says it writes cheques of $250K to $525K.

### Does SOSV lead rounds?

Sometimes: it led 2 of its 950 investments on record (0%).

### Where does SOSV invest?

Most of the companies it backs are in the United States (71%), the United Kingdom (11%) and Austria (5%).

### Is SOSV investing now?

Yes: it is actively investing, with 73 investments in the last 12 months.

### Who does SOSV invest alongside?

Most often HAX (100 rounds together), Orbit Ventures (89 rounds together) and Chinaccelerator (57 rounds together).

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