# MassChallenge: portfolio, investments and team

> MassChallenge is an accelerator based in United States. 984 investments on record, 77 in the last 12 months, latest Sept 2026.

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

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

# MassChallenge

Last cheque observed Sep 2026; 984 cheques on record.

Deploying now Accelerator

Pre-seed Seed Series A Sustainability Sustainable Social Impact

Deploying now

**47%** of best year **77** **cheques in 12 months**, 984 on record

Since the last cheque **55** days **00** hrs **00** min **00** sec

Median round **$1.8M** Rounds led **0 of 984** Sole investor **259 rounds** Exits **3 from the portfolio** Mostly in **United States, 53%**

Pitch MassChallenge

## MassChallenge highlights

- 01 77 cheques in the last 12 months
- 02 Mostly Venture and Seed: 67% of its rounds
- 03 Sole investor in 259 rounds, median $373K
- 04 3 exits from the portfolio

## What they do

- **Type:** Accelerator (from a list, unverified)
- **Cheque size:** Not stated
- **Stages:** Pre-seed Seed Series A Series B
- **Sectors:** Sustainability Sustainable Social Impact
- **Based in:** Boston, United States
- **Cold pitches:** Not stated

## The record

Every round we can evidence, newest first **984 appearances**

- **2026** 54 rounds
- **Sept** **[INIA Biosciences](https://millionrounds.com/company/inia-biosciences)** Seed · US **$1.5M** With 2 others
- **Sept** **[Greencovery](https://millionrounds.com/company/greencovery)** Seed · NL **$1.2M** Sole investor
- **Sept** **[Oklo](https://millionrounds.com/company/oklo)** US **$1.0B** With 2 others
- **Sept** **[DynamiCare Health](https://millionrounds.com/company/dynamicare-health)** Venture · US **$720K** With 1 other
- **Jul** **[moneyHOP](https://millionrounds.com/company/moneyhop)** Venture · GB **$826K** Sole investor
- **Jul** **[NALA Membranes](https://millionrounds.com/company/nala-membranes)** Growth · US **$11M** With 2 others
- **Jul** **[Microcaps](https://millionrounds.com/company/microcaps)** Venture · CH **$10M** With 1 other
- **Jul** **[Treeless](https://millionrounds.com/company/treeless)** Seed · CH **$1.5M** Sole investor
- **Jul** **[Waveguide](https://millionrounds.com/company/waveguide)** Debt · US **$200K** Sole investor
- **Jul** **[Infinite Cooling](https://millionrounds.com/company/infinite-cooling)** Venture · US **$5.3M** With 2 others
- **Jun** **[Rrreefs](https://millionrounds.com/company/rrreefs)** Crowdfunding · CH **$1.1M** Sole investor
- **Jun** **[Combioxin S.A.](https://millionrounds.com/company/combioxin-s-a)** Grant · CH **$1.4M** Sole investor
- **Jun** **[Hydromea](https://millionrounds.com/company/hydromea)** Grant · CH **$1.0M** With 3 others
- **May** **[iSpecimen](https://millionrounds.com/company/ispecimen)** US **$2.5M** Sole investor
- **May** **[Noriware](https://millionrounds.com/company/noriware)** Grant · CH **$1.4M** With 1 other
- **May** **[PerPlant](https://millionrounds.com/company/perplant)** Seed · DK **$1.2M** With 3 others
- **May** **[SALT ATHLETIC](https://millionrounds.com/company/salt-athletic)** US **$365K** Sole investor
- **May** **[Natrion](https://millionrounds.com/company/natrion)** Venture · US **Undisclosed** With 1 other
- **Apr** **[UMNAI](https://millionrounds.com/company/umnai)** Pre-seed · GB **$232K** Sole investor
- **Apr** **[BLP Digital](https://millionrounds.com/company/blp-digital)** Secondary · CH **$50M** With 2 others
- **Apr** **[MuukTest](https://millionrounds.com/company/muuktest)** Grant · US **$499K** With 4 others
- **Apr** **[Confidentialmind](https://millionrounds.com/company/confidentialmind)** Seed · FI **$4.1M** With 2 others
- **Apr** **[Neurava](https://millionrounds.com/company/neurava)** Grant · US **$4.0M** With 2 others
- **Apr** **[Patientory](https://millionrounds.com/company/patientory)** Venture · US **$500K** With 2 others
- **Apr** **[Naturbeads](https://millionrounds.com/company/naturbeads)** Grant · GB **$4.8M** With 3 others
- **Mar** **[Flourish Care](https://millionrounds.com/company/flourish-care)** Seed · US **$5.7M** With 2 others
- **Mar** **[AgZen](https://millionrounds.com/company/agzen)** Series B · US **$10M** With 2 others
- **Mar** **[Matidor.com](https://millionrounds.com/company/matidor-com)** Venture · CA **Undisclosed** With 3 others
- **Mar** **[Malama Health](https://millionrounds.com/company/malama-health)** Seed · US **$6.9M** With 2 others
- **Mar** **[Surf Therapeutics](https://millionrounds.com/company/surf-therapeutics)** Seed · US **$6.0M** With 2 others
- **Mar** **[SolidWatts](https://millionrounds.com/company/solidwatts)** Seed · CH **$2.3M** With 3 others
- **Mar** **[EnVision Endoscopy](https://millionrounds.com/company/envision-endoscopy)** Series A · US **$500K** With 2 others
- **Mar** **[Cyclops.io](https://millionrounds.com/company/cyclops-io)** Seed · US **$8.0M** With 1 other
- **Mar** **[Plair](https://millionrounds.com/company/plair)** Venture · CH **$1.3M** With 2 others
- **Mar** **[Starling Medical](https://millionrounds.com/company/starling-medical)** Venture · US **$825K** With 3 others
- **Mar** **[Clean Valley Bio-filtration Technologies](https://millionrounds.com/company/clean-valley-bio-filtration-technologies)** Debt · CA **$4.0M** With 2 others
- **Mar** **[Amulet](https://millionrounds.com/company/amulet)** Debt · US **$758K** With 2 others
- **Feb** **[Breaker](https://millionrounds.com/company/breaker)** Seed · AU · Startup Daily **$9.0M** With 2 others
- **Feb** **[Shearwater Aerospace](https://millionrounds.com/company/shearwater-aerospace)** Seed · CA **$3.0M** Sole investor
- **Feb** **[Apeiron labs](https://millionrounds.com/company/apeiron-labs)** Series A · US **$9.5M** 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

We hold **2** 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.

## Exits from the portfolio

Companies it backed that were later bought or listed **3 in all**

**[Ubersense](https://millionrounds.com/company/ubersense)** Bought by Hudl **Undisclosed** Sept 2014

**[IntegralReach](https://millionrounds.com/company/integralreach)** Bought by [Rovi Corporation](https://millionrounds.com/fund/rovi-corporation) **Undisclosed** Apr 2013

**[Locately](https://millionrounds.com/company/locately)** Bought by [Service Management Group](https://millionrounds.com/fund/service-management-group) **Undisclosed** Aug 2012

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

## The cheque

Pre-seed Seed Series A

Median round joined **$1.8M** the round, not its cheque Alone, median **$373K**

Led 0 of 984 rounds **0%**

- **Sole investor:** 259 rounds
- **Last cheque:** Sept 2026
- **Exits:** 3 from the portfolio

Rounds by stage said on their site

- Venture *335*
- Seed said *270*
- Grant *154*
- Series A said *71*
- Pre-seed said *49*
- Series B said *28*

Cheques by month Led Joined

Nov 2023 Oct 2026

Often in the room with

- [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) 104
- [Techstars](https://millionrounds.com/fund/techstars) 71
- [Venture Kick](https://millionrounds.com/fund/venture-kick) 43
- [EIC Accelerator](https://millionrounds.com/fund/eic-accelerator) 29
- [Innosuisse](https://millionrounds.com/fund/innosuisse) 27
- [Y Combinator](https://millionrounds.com/fund/y-combinator) 26

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## Who they invest alongside

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

[**National Science Foundation** Government **104** rounds together](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno)[**Techstars** VC firm **71** rounds together](https://millionrounds.com/fund/techstars)[**Venture Kick** Accelerator **43** rounds together](https://millionrounds.com/fund/venture-kick)[**EIC Accelerator** Government **29** rounds together](https://millionrounds.com/fund/eic-accelerator)[**Innosuisse** Government **27** rounds together](https://millionrounds.com/fund/innosuisse)[**Y Combinator** Accelerator **26** rounds together](https://millionrounds.com/fund/y-combinator)[**MassVentures** VC firm **23** rounds together](https://millionrounds.com/fund/massventures)[**Right Side Capital Management** VC firm **22** rounds together](https://millionrounds.com/fund/right-side-capital-management)[**EISMEA** Investment firm **18** rounds together](https://millionrounds.com/fund/eismea)[**National Institutes of Health** Government **18** rounds together](https://millionrounds.com/fund/national-institutes-of-health)[**Google for Startups** Accelerator **17** rounds together](https://millionrounds.com/fund/google-for-startups)[**Plug and Play** Accelerator **16** rounds together](https://millionrounds.com/fund/plug-and-play)

## Recently backed

The latest companies MassChallenge put money into.

[**INIA Biosciences** $1.5M · Sept 2026](https://millionrounds.com/company/inia-biosciences)[**Greencovery** $1.2M · Sept 2026](https://millionrounds.com/company/greencovery)[**DynamiCare Health** $720K · Sept 2026](https://millionrounds.com/company/dynamicare-health)[**moneyHOP** $826K · Jul 2026](https://millionrounds.com/company/moneyhop)[**NALA Membranes** $11M · Jul 2026](https://millionrounds.com/company/nala-membranes)[**Microcaps** $10M · Jul 2026](https://millionrounds.com/company/microcaps)

## On podcasts

1 episode naming MassChallenge in the title, and 1 more that mention it.

- [This Week in Startups](https://millionrounds.com/podcasts/this-week-in-startups) 6 May 2020 · 1h 5m E1054: The Power of Accelerators E3 Siobhan Dullea, CEO of MassChallenge on running a non-profit accelerator, accepting hundreds of companies per year, what makes a great application, why East Coast investors are more conservative & more! Mentions [MassChallenge](https://millionrounds.com/fund/masschallenge) Apple PodcastsShow page

### Mentioned in

- [BRAVE Southeast Asia Tech](https://millionrounds.com/podcasts/brave-southeast-asia) 5 Aug 2021 · 59 min Q&A: Cofounder Compatibility, Role Negotiations & Minimum Viable Relationship - E82 Apple PodcastsShow page

## Quick answers about MassChallenge

### What does MassChallenge invest in?

MassChallenge invests most often at Venture and Seed (67% of the rounds on record), in sectors such as Sustainability, Sustainable and Social Impact.

### How active is MassChallenge?

984 investments on record, 77 of them in the last 12 months. The most recent was in Sept 2026.

### What has MassChallenge invested in recently?

Its most recent investments on record: INIA Biosciences (Seed, Sept 2026), Greencovery (Seed, Sept 2026) and Oklo (Undisclosed round, Sept 2026).

### How big are MassChallenge's cheques?

The median round it joins is $1.8M.

### Does MassChallenge lead rounds?

Rarely, if at all: none of its 984 investments on record names it as the lead.

### Where does MassChallenge invest?

Most of the companies it backs are in the United States (53%), Switzerland (23%) and the United Kingdom (8%).

### Is MassChallenge investing now?

Yes: it is actively investing, with 77 investments in the last 12 months.

### Who does MassChallenge invest alongside?

Most often National Science Foundation (104 rounds together), Techstars (71 rounds together) and Venture Kick (43 rounds together).

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Built from the rounds we watched, its filings and its own website, refreshed every night. [How we count](https://millionrounds.com/methodology) · [Report a correction](https://millionrounds.com/corrections?slug=masschallenge) · [Is this your firm? Claim it](https://millionrounds.com/claim?org=masschallenge)