# Longwood Fund: portfolio, investments and team > Longwood Fund is a vc firm based in United States. 53 investments on record, 8 in the last 12 months, latest Aug 2026. Portfolio, stages, co-investors and team. Source: https://millionrounds.com/fund/longwood-fund (Millionrounds; every figure on the page links to its filing or article) United States · [Investor](https://millionrounds.com/investors) # Longwood Fund Last cheque observed Aug 2026; 53 cheques on record. Email Deploying now New fund $158M, Dec 2024 VC firm Seed Series A Series B Analytics Bio Technology Biotechnology Follow Longwood Fund and see its new cheques in your feed. [Start following](https://millionrounds.com/login?join=1&why=follow&next=%2Ffund%2Flongwood-fund) Deploying now **67%** of best year **8** **cheques in 12 months**, 53 on record Since the last cheque **79** days **00** hrs **00** min **00** sec Median round **$60M** Cheque size, as they say **$100K – $5.0M** Rounds led **1 of 53** Sole investor **4 rounds** Exits **2 from the portfolio** Mostly in **United States, 89%** Pitch Longwood Fund ## Longwood Fund highlights - 01 8 cheques in the last 12 months - 02 Mostly Series A and Series B: 75% of its rounds - 03 Sole investor in 4 rounds, median $12M - 04 2 exits from the portfolio ## What they do > Filed 1 private fund offering with the SEC, the most recent in 2023-12 From their own website - **Type:** VC firm (from a list, unverified) - **Cheque size:** $100K – $5.0M as they say - **Stages:** Seed Series A Series B Growth - **Sectors:** Analytics Bio Technology Biotechnology - **Based in:** Boston, United States - **Cold pitches:** Not stated ## The record Every round we can evidence, newest first **53 appearances** - **2026** 6 rounds - **Aug** **[Khartis Therapeutics](https://millionrounds.com/company/khartis-therapeutics)** Series B · US · Ventureburn **$50M** With 5 others - **Apr** **[Neomorph](https://millionrounds.com/company/neomorph)** Series B · US · TechStartups **$100M** With 4 others - **Apr** **[Sidewinder Therapeutics](https://millionrounds.com/company/sidewinder-therapeutics)** Series B · US · Ventureburn **$137M** With 8 others - **Apr** **[Coultreon Biopharma](https://millionrounds.com/company/coultreon-biopharma)** Series A · BE **$125M** With 2 others - **Feb** **[Evommune](https://millionrounds.com/company/evommune)** US **$125M** With 5 others - **Jan** **[Mediar Therapeutics](https://millionrounds.com/company/mediar-therapeutics)** Series B · US **$76M** With 2 others - **2025** 11 rounds - **Nov** **[AAVantgarde Bio](https://millionrounds.com/company/aavantgarde-bio)** Series B · IT **$141M** With 3 others - **Nov** **[Verastem Oncology](https://millionrounds.com/company/verastem-oncology)** US **$90M** With 4 others - **Oct** **[Vertero](https://millionrounds.com/company/vertero)** Series D · US **$20M** With 2 others - **Sept** **[Avenzo Therapeutics](https://millionrounds.com/company/avenzo-therapeutics)** Series B · US **$60M** With 5 others - **Sept** **[Crystalys Therapeutics](https://millionrounds.com/company/crystalys-therapeutics)** Series A · US **$205M** With 3 others - **Sept** **[KalVista Pharmaceuticals](https://millionrounds.com/company/kalvista-pharmaceuticals)** Debt · US **$125M** With 4 others - **Apr** **[Solu Therapeutics](https://millionrounds.com/company/solu-therapeutics)** Series A · US **$41M** With 3 others - **Feb** **[XyloCor Therapeutics](https://millionrounds.com/company/xylocor-therapeutics)** Series B · US · Crunchbase News **$68M** With 2 others - **Feb** **[Newleos Therapeutics](https://millionrounds.com/company/newleos-therapeutics)** Series A · US **$94M** With 3 others - **Jan** **[Interius BioTherapeutics](https://millionrounds.com/company/interius-biotherapeutics)** Venture · US **$22M** With 3 others - **Jan** **[Be Biopharma](https://millionrounds.com/company/be-biopharma)** Series C · US **$92M** With 3 others - **2024** 5 rounds - **Dec** **[TScan Therapeutics](https://millionrounds.com/company/tscan-therapeutics)** US **$30M** With 5 others - **Jun** **[Interius BioTherapeutics](https://millionrounds.com/company/interius-biotherapeutics)** Series B · US **$51M** With 2 others - **May** **[Bbot](https://millionrounds.com/company/bbot)** Venture · US **$200M** With 4 others - **May** **[Progentos Therapeutics](https://millionrounds.com/company/progentos-therapeutics)** Series A · US **$65M** With 2 others - **Mar** **[Engrail Therapeutics](https://millionrounds.com/company/engrail-therapeutics)** Series B · US **$157M** With 4 others - **2023** 3 rounds - **Dec** **[Tome Biosciences](https://millionrounds.com/company/tome-biosciences)** Series A · US **$213M** With 4 others - **Dec** **[Lassen Therapeutics](https://millionrounds.com/company/lassen-therapeutics)** Series B · US **$85M** With 2 others - **Sept** **[Sitryx Therapeutics](https://millionrounds.com/company/sitryx-therapeutics)** Series A · GB **$39M** With 4 others - **2022** 6 rounds - **Dec** **[Pulmocide](https://millionrounds.com/company/pulmocide)** Series C · GB **$52M** With 3 others - **Sept** **[Photys Therapeutics](https://millionrounds.com/company/photys-therapeutics)** Series A · US **$75M** With 2 others - **Jun** **[Carbon Biosciences](https://millionrounds.com/company/carbon-biosciences)** Series A · US **$38M** With 3 others - **Jun** **[DEM BioPharma](https://millionrounds.com/company/dem-biopharma)** Series A · US **$70M** With 2 others - **May** **[Werewolf Therapeutics](https://millionrounds.com/company/werewolf-therapeutics)** Secondary · US **$50M** With 3 others - **Mar** **[Calithera Biosciences](https://millionrounds.com/company/calithera-biosciences)** US **$10M** With 1 other - **2021** 4 rounds - **Oct** **[Rectify Pharmaceuticals](https://millionrounds.com/company/rectify-pharmaceuticals)** Series A · US **$100M** With 3 others - **Aug** **[Immunitas Therapeutics](https://millionrounds.com/company/immunitas-therapeutics)** Series B · US **$58M** Sole investor - **Jun** **[ImmuneID](https://millionrounds.com/company/immuneid)** Series A **$50M** With 3 others - **Apr** **[Renovia](https://millionrounds.com/company/renovia)** Series C **$17M** With 3 others - **2020** 1 round - **Mar** **[Millendo Therapeutics](https://millionrounds.com/company/millendo-therapeutics)** **$50M** With 3 others - **2019** 5 rounds - **Dec** **[ArcherDx](https://millionrounds.com/company/archerdx)** Series C · US · FinSMEs **$55M** With 8 others - **Nov** **[Wereworld Therapeutics](https://millionrounds.com/company/wereworld-therapeutics)** Series A · US · FinSMEs **$56M** *Led* - **Jul** **[Tscan Therapeutics](https://millionrounds.com/company/tscan-therapeutics)** Series B · US · FinSMEs **$48M** With 4 others - **May** **[ArcherDX](https://millionrounds.com/company/archerdx)** Series B · US · FinSMEs **$60M** With 4 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 **4 named** CW **Christoph Westphal** Managing Member of the General Partner i Filing they signed DA **David A Steinberg** Other Executive Officer i Form ADV JO **Joshua O'Brien Lubov** Chief Financial Officer i Form ADV RH **Richard H. (mi Only) Aldrich** Other Executive Officer i Form ADV We also hold **15** 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 **$456M** gross assets of its funds Oct 2026 **Exempt** reporting adviser venture or small private funds - **Legal name:** Longwood Management LLC - **SEC number:** CRD 281220 ## Exits from the portfolio Companies it backed that were later bought or listed **2 in all** **[Verastem](https://millionrounds.com/company/verastem)** Listed **$52M** Jul 2013 **[PTC Therapeutics](https://millionrounds.com/company/ptc-therapeutics)** Listed **$125M** Jun 2013 An exit counts when it came after the firm's first round in the company. From historical deal records. New fund on file **$158M** raised in Dec 2024 From its SEC filing, not a journalist: a firm that has just raised has money to deploy. ## The cheque Seed Series A Series B Median round joined **$60M** the round, not its cheque Alone, median **$12M** Led 1 of 53 rounds **2%** - **Said size:** $100K – $5.0M - **Sole investor:** 4 rounds - **Last cheque:** Aug 2026 - **Exits:** 2 from the portfolio Rounds by stage said on their site - Series A said *17* - Series B said *16* - Series C *6* - Venture *4* - Secondary *1* - Seed said *-* - Growth said *-* Cheques by month Led Joined Nov 2023 Oct 2026 Often in the room with - [RA Capital Management](https://millionrounds.com/fund/ra-capital-management) 8 - [Bessemer Venture Partners](https://millionrounds.com/fund/bessemer-venture-partners) 7 - [Alexandria Venture Investments](https://millionrounds.com/fund/alexandria-venture-investments) 5 - [MPM Capital](https://millionrounds.com/fund/mpm-bioimpact) 5 - [Cormorant Asset Management](https://millionrounds.com/fund/cormorant-asset-management) 4 - [Forbion Capital Partners](https://millionrounds.com/fund/forbion-capital-partners) 4 **Pitching Longwood Fund?** Put them on your fundraising board with this record on the card, and follow them to hear when they write a new cheque. Add to your CRM *→* ## Who they invest alongside The investors most often in the same rounds as Longwood Fund. A count of rooms they were both in, not a relationship either has claimed. [**RA Capital Management** Private equity **8** rounds together](https://millionrounds.com/fund/ra-capital-management)[**Bessemer Venture Partners** VC firm **7** rounds together](https://millionrounds.com/fund/bessemer-venture-partners)[**Alexandria Venture Investments** VC firm **5** rounds together](https://millionrounds.com/fund/alexandria-venture-investments)[**MPM Capital** Private equity **5** rounds together](https://millionrounds.com/fund/mpm-bioimpact)[**Cormorant Asset Management** Private equity **4** rounds together](https://millionrounds.com/fund/cormorant-asset-management)[**Forbion Capital Partners** Private equity **4** rounds together](https://millionrounds.com/fund/forbion-capital-partners)[**Novo Holdings** VC firm **4** rounds together](https://millionrounds.com/fund/novo-ventures)[**Sofinnova Partners** VC firm **4** rounds together](https://millionrounds.com/fund/sofinnova-partners)[**ARCH Venture Partners** VC firm **3** rounds together](https://millionrounds.com/fund/arch-venture-partners)[**Adage Capital Management** Asset manager **3** rounds together](https://millionrounds.com/fund/adage-capital-management)[**Cardinal Partners** VC firm **3** rounds together](https://millionrounds.com/fund/cardinal-partners-cp-venture-capital)[**DCVC** VC firm **3** rounds together](https://millionrounds.com/fund/data-collective) ## Recently backed The latest companies Longwood Fund put money into. [**Sidewinder Therapeutics** $137M · Apr 2026](https://millionrounds.com/company/sidewinder-therapeutics)[**Coultreon Biopharma** $125M · Apr 2026](https://millionrounds.com/company/coultreon-biopharma)[**Evommune** $125M · Feb 2026](https://millionrounds.com/company/evommune)[**Mediar Therapeutics** $76M · Jan 2026](https://millionrounds.com/company/mediar-therapeutics)[**AAVantgarde Bio** $141M · Nov 2025](https://millionrounds.com/company/aavantgarde-bio)[**Verastem Oncology** $90M · Nov 2025](https://millionrounds.com/company/verastem-oncology) ## Quick answers about Longwood Fund ### What does Longwood Fund invest in? Longwood Fund invests most often at Series A and Series B (75% of the rounds on record), in sectors such as Analytics, Bio Technology and Biotechnology. ### How active is Longwood Fund? 53 investments on record, 8 of them in the last 12 months, and it led 1. The most recent was in Aug 2026. ### What has Longwood Fund invested in recently? Its most recent investments on record: Khartis Therapeutics (Series B, Aug 2026), Neomorph (Series B, Apr 2026) and Sidewinder Therapeutics (Series B, Apr 2026). ### How big are Longwood Fund's cheques? The median round it joins is $60M. It says it writes cheques of $100K to $5.0M. ### Does Longwood Fund lead rounds? Sometimes: it led 1 of its 53 investments on record (2%). ### Where does Longwood Fund invest? Most of the companies it backs are in the United States (89%) and the United Kingdom (5%). ### Is Longwood Fund investing now? Yes: it is actively investing, with 8 investments in the last 12 months. ### Who does Longwood Fund invest alongside? Most often RA Capital Management (8 rounds together), Bessemer Venture Partners (7 rounds together) and Alexandria Venture Investments (5 rounds together). ## Raising now? Find the investors who back rounds like yours, and keep every conversation on one fundraising board. Find similar investorsOpen your CRM 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=longwood-fund) · [Is this your firm? Claim it](https://millionrounds.com/claim?org=longwood-fund)