# J2 Ventures: portfolio, investments and team

> J2 Ventures is a vc firm based in United States. 39 investments on record, 17 in the last 12 months, latest Sept 2026. Portfolio, stages, co-investors and team.

Source: https://millionrounds.com/fund/j2-ventures (Millionrounds; every figure on the page links to its filing or article)

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

# J2 Ventures

Last cheque observed Sep 2026; 39 cheques on record.

Email

Deploying now New fund $2.5M, Sept 2026 VC firm

Pre-seed Seed Series A Advanced Computing Biomedical Engineering Cybersecurity

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Deploying now

**94%** of best year **17** **cheques in 12 months**, 39 on record

Since the last cheque **36** days **00** hrs **00** min **00** sec

Median round **$12M** Rounds led **2 of 39** Sole investor **8 rounds** Mostly in **United States, 95%**

Pitch J2 Ventures

## J2 Ventures highlights

- 01 17 cheques in the last 12 months
- 02 Mostly Seed and Venture: 61% of its rounds
- 03 Sole investor in 8 rounds, median $11M

## What they do

> We fuel early-stage companies pioneering technologies across advanced computing, biomedical engineering, cybersecurity, and infrastructure. From their own website

- **Type:** VC firm (from a list, unverified)
- **Cheque size:** Not stated
- **Stages:** Pre-seed Seed Series A Series B Growth
- **Sectors:** Advanced Computing Biomedical Engineering Cybersecurity
- **Based in:** Medford, United States
- **Cold pitches:** Not stated

## The record

Every round we can evidence, newest first **39 appearances**

- **2026** 17 rounds
- **Sept** **[Mesa Quantum](https://millionrounds.com/company/mesa-quantum)** Series A · US · HAX **$12M** With 3 others
- **Sept** **[FemtoAI](https://millionrounds.com/company/femtoai)** Venture · US **$22M** With 2 others
- **Aug** **[InfiniG](https://millionrounds.com/company/infinig)** Seed · US **$5.2M** Sole investor
- **Jul** **[Inner Logic](https://millionrounds.com/company/inner-logic)** Seed · US · TechStartups **$12M** With 8 others
- **Jul** **[Arkenstone Defense](https://millionrounds.com/company/arkenstone-defense)** Seed · US · Ventureburn **$35M** *Led*
- **Jun** **[Phoenix Tailings](https://millionrounds.com/company/phoenix-tailings)** Debt · US **$500M** With 3 others
- **Jun** **[Sazabi](https://millionrounds.com/company/sazabi)** Venture · US **Undisclosed** With 2 others
- **Jun** **[Principal Mineral](https://millionrounds.com/company/principal-mineral)** Venture · US **$280M** Sole investor
- **May** **[Cinder](https://millionrounds.com/company/cinder)** Series B · US · AlleyWatch **$41M** With 7 others
- **May** **[Lumia](https://millionrounds.com/company/lumia)** Crowdfunding · US **$1.5M** With 2 others
- **Apr** **[Flashpass](https://millionrounds.com/company/flashpass)** Seed · US **$4.3M** With 1 other
- **Feb** **[Aalyria](https://millionrounds.com/company/aalyria)** Series B · Crunchbase News **$100M** *Led*
- **Feb** **[Code Metal](https://millionrounds.com/company/code-metal)** Series B · US · Ventureburn **$125M** With 9 others
- **Feb** **[Phoenix Tailings](https://millionrounds.com/company/phoenix-tailings)** Series B · US **$30M** With 3 others
- **Jan** **[SkyFi](https://millionrounds.com/company/skyfi)** Series A · US · TechCrunch **$13M** With 10 others
- **Jan** **[Mesa Quantum](https://millionrounds.com/company/mesa-quantum)** Series A · US **$11M** With 2 others
- **Jan** **[Civic](https://millionrounds.com/company/civic)** Seed · US **$1.0M** With 1 other
- **2025** 13 rounds
- **Sept** **[Unit 221B](https://millionrounds.com/company/unit-221b)** Seed · US · TechCrunch **$5.0M** Sole investor
- **Sept** **[Skyfire](https://millionrounds.com/company/skyfire)** Venture · US · Blitzscaling Ventures **$14M** With 3 others
- **Sept** **[Shift5](https://millionrounds.com/company/shift5)** Series C · US **$75M** With 2 others
- **Jun** **[VectorWave](https://millionrounds.com/company/vectorwave)** Seed · US **$2.5M** Sole investor
- **Jun** **[Phoenix Semiconductor](https://millionrounds.com/company/phoenix-semiconductor)** Seed · US **$5.5M** With 1 other
- **Apr** **[Safi Biosolutions](https://millionrounds.com/company/safi-biosolutions)** Venture · US **Undisclosed** With 1 other
- **Mar** **[LightSource](https://millionrounds.com/company/lightsource)** Series A · US **$33M** With 4 others
- **Feb** **[Lumia](https://millionrounds.com/company/lumia)** Venture · US **$6.8M** With 3 others
- **Feb** **[Musubi](https://millionrounds.com/company/musubi)** Seed · US **$5.0M** Sole investor
- **Jan** **[Micron Biomedical](https://millionrounds.com/company/micron-biomedical)** Series A · US **$16M** Sole investor
- **Jan** **[Holly](https://millionrounds.com/company/holly)** Pre-seed · US **$2.2M** With 1 other
- **Jan** **[FemtoAI](https://millionrounds.com/company/femtoai)** Venture · US **$60K** With 3 others
- **Jan** **[Druid Software](https://millionrounds.com/company/druid-software)** Venture · IE **$20M** Sole investor
- **2024** 6 rounds
- **Dec** **[Aether Biomedical](https://millionrounds.com/company/aether-biomedical)** Venture · PL **Undisclosed** With 2 others
- **Nov** **[Parallel Fluidics](https://millionrounds.com/company/parallel-fluidics)** Seed · US **$7.0M** With 3 others
- **Aug** **[Gamebeast](https://millionrounds.com/company/gamebeast)** Pre-seed · US **$3.7M** With 1 other
- **Mar** **[Redcoat AI](https://millionrounds.com/company/redcoat-ai)** Seed · US **$4.2M** With 2 others
- **Jan** **[Cinder Technologies](https://millionrounds.com/company/cinder-technologies)** Venture · US **Undisclosed** With 3 others
- **Jan** **[Kusari](https://millionrounds.com/company/kusari)** Seed · US **$8.1M** With 2 others
- **2023** 1 round
- **May** **[Sealonix](https://millionrounds.com/company/sealonix)** Series A · US **$20M** Sole investor
- **2022** 1 round
- **Jul** **[Acalvio Technologies](https://millionrounds.com/company/acalvio-technologies)** Series D · US **$17M** With 2 others
- **2021** 1 round
- **Dec** **[Tasso](https://millionrounds.com/company/tasso)** Series B · US **$100M** With 3 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 **2 named**

JA **Jonathan Alexander Bronson** Executive Officer i Filing they signed

MA **Michael Alexander Harstrick** Executive Officer i Filing they signed

We also hold **11** 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

**$577M** gross assets of its funds Oct 2026

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

- **Legal name:** J2 Ventures Advisors, LLC
- **SEC number:** CRD 317140

## What they claim to have backed

From their own portfolio page (on their website)

**19** of 36 we have independently watched raise

[Aalyria Laser fast](https://millionrounds.com/company/aalyria)[Aether Human and](https://millionrounds.com/company/aether-biomedical)[Apex Space Next-gen](https://millionrounds.com/company/apex)[Arkenstone Defense HR](https://millionrounds.com/company/arkenstone-defense)[Cinder Unified intelligence](https://millionrounds.com/company/cinder)[Code Metal Optimized](https://millionrounds.com/company/code-metal)[Druid Global leader](https://millionrounds.com/company/druid-software)[GameBeast Dynamic digital](https://millionrounds.com/company/gamebeast)[InfiniG Mobile coverage](https://millionrounds.com/company/infinig)[Kusari Blueprint for](https://millionrounds.com/company/kusari)[LightSource Effortless, on-budget](https://millionrounds.com/company/lightsource)[Micron Biomedical Injections](https://millionrounds.com/company/micron-biomedical)[Parallel Fluidics Rapid,](https://millionrounds.com/company/parallel-fluidics)[Principal Mineral Building](https://millionrounds.com/company/principal-mineral)[Ravn Rugged communications](https://millionrounds.com/company/ravn)[SkyFi The world's](https://millionrounds.com/company/skyfi)[Tasso Needle free](https://millionrounds.com/company/tasso)[Unit 221B Military](https://millionrounds.com/company/unit-221b)[VectorWave Compute on](https://millionrounds.com/company/vectorwave) Acalvio Leading edge Femtosense Hyper-efficient compute Flashpass Education Upskilling Holly AI powered Lumia Health Biometric MesaQuantum Chip-Scale Quantum Sensing Musubi AI content Nametag Passwordless authentication Oura Ring Clinical Paravision Mission critical Phoenix Semiconductor Legacy Plato Systems Tagless Press Kit Redcoat AI Defense Safi Bio-manufactured human blood Somnair Non-invasive neurostimulation iCOUNTER AI-driven Cyber Defense

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.

New fund on file

**$2.5M**

raised in Sept 2026

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

## The cheque

Pre-seed Seed Series A

Median round joined **$12M** the round, not its cheque Alone, median **$11M**

Led 2 of 39 rounds **5%**

- **Sole investor:** 8 rounds
- **Last cheque:** Sept 2026

Rounds by stage said on their site

- Seed said *12*
- Venture *10*
- Series A said *6*
- Series B said *5*
- Pre-seed said *2*
- Crowdfunding *1*
- Growth said *-*

Cheques by month Led Joined

Nov 2023 Oct 2026

Often in the room with

- [Accel](https://millionrounds.com/fund/accel) 3
- [Gaingels](https://millionrounds.com/fund/gaingels) 3
- [Techstars](https://millionrounds.com/fund/techstars) 3
- [Y Combinator](https://millionrounds.com/fund/y-combinator) 3
- [Amino Capital](https://millionrounds.com/fund/amino-capital) 2
- [BonAngels Venture Partners](https://millionrounds.com/fund/bon-angels) 2

**Pitching J2 Ventures?** 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 J2 Ventures. A count of rooms they were both in, not a relationship either has claimed.

[**Accel** VC firm **3** rounds together](https://millionrounds.com/fund/accel)[**Gaingels** Private equity **3** rounds together](https://millionrounds.com/fund/gaingels)[**Techstars** VC firm **3** rounds together](https://millionrounds.com/fund/techstars)[**Y Combinator** Accelerator **3** rounds together](https://millionrounds.com/fund/y-combinator)[**Amino Capital** Accelerator **2** rounds together](https://millionrounds.com/fund/amino-capital)[**BonAngels Venture Partners** Accelerator **2** rounds together](https://millionrounds.com/fund/bon-angels)[**HAX** Accelerator **2** rounds together](https://millionrounds.com/fund/hax)[**Karman Ventures** VC firm **2** rounds together](https://millionrounds.com/fund/karman-ventures)[**National Institute on Aging** VC firm **2** rounds together](https://millionrounds.com/fund/national-institute-on-aging)[**National Science Foundation** Government **2** rounds together](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno)[**Pioneer Fund** Private equity **2** rounds together](https://millionrounds.com/fund/pioneer-fund-2)[**SOSV** VC firm **2** rounds together](https://millionrounds.com/fund/sosv)

## Recently backed

The latest companies J2 Ventures put money into.

[**Mesa Quantum** $12M · Sept 2026](https://millionrounds.com/company/mesa-quantum)[**FemtoAI** $22M · Sept 2026](https://millionrounds.com/company/femtoai)[**InfiniG** $5.2M · Aug 2026](https://millionrounds.com/company/infinig)[**Inner Logic** $12M · Jul 2026](https://millionrounds.com/company/inner-logic)[**Arkenstone Defense** $35M · Jul 2026](https://millionrounds.com/company/arkenstone-defense)[**Phoenix Tailings** $500M · Jun 2026](https://millionrounds.com/company/phoenix-tailings)

## Mentioned on podcasts

Episodes that name J2 Ventures in their description, not their title.

- [Equity](https://millionrounds.com/podcasts/equity) 9 Oct 2024 · 28 min Investors are betting on user-generated content, and Gamebeast's founder explains why Mentions [J2 Ventures](https://millionrounds.com/fund/j2-ventures) Apple PodcastsShow page

## Quick answers about J2 Ventures

### What does J2 Ventures invest in?

J2 Ventures invests most often at Seed and Venture (61% of the rounds on record), in sectors such as Advanced Computing, Biomedical Engineering and Cybersecurity.

### How active is J2 Ventures?

39 investments on record, 17 of them in the last 12 months, and it led 2. The most recent was in Sept 2026.

### What has J2 Ventures invested in recently?

Its most recent investments on record: Mesa Quantum (Series A, Sept 2026), FemtoAI (Venture, Sept 2026) and InfiniG (Seed, Aug 2026).

### How big are J2 Ventures's cheques?

The median round it joins is $12M.

### Does J2 Ventures lead rounds?

Sometimes: it led 2 of its 39 investments on record (5%).

### Where does J2 Ventures invest?

Most of the companies it backs are in the United States (95%).

### Is J2 Ventures investing now?

Yes: it is actively investing, with 17 investments in the last 12 months.

### Who does J2 Ventures invest alongside?

Most often Accel (3 rounds together), Gaingels (3 rounds together) and Techstars (3 rounds together).

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