Sector portfolio · VC firm · United States
Longwood Fund's Biotech portfolio
Longwood Fund has backed 27 Biotech startups in rounds we track, $2.4B between them, shown by the stage each has reached. The best-funded is Tome Biosciences.
Series B
11
Series A
10
Funding by segment
- Series B$1.1B11
- Series A$724M10
- Series C and later$427M4
- Stage not reported$175M2
Where they are based
- United States24$2.1B
- Italy1$141M
- United Kingdom1$110M
United States
Italy
United KingdomFounded
5 without a founding year on record.
Total raised
- Under $1M0
- $1M to $10M0
- $10M to $50M3
- $50M to $250M24
- $250M to $1B0
- $1B and over0
Each dot is a startup: the year it was founded across, the total it has raised up (each line is ten times the one below). Pick a segment to pick it out.
22 of 27 startups shown; the rest have no founding year or amount on record.
- 1 to 2
- 3 to 7
- 8 to 24
- 25 to 99
- 100 and more
- United States24
- Italy1
- United Kingdom1
Startups by country, 3 countries in all.
Segment by segment
Series B
11 startups · $1.1B raised
- NNeomorphUnited States$209M
Mediar TherapeuticsMediar Therapeutics is a clinical-stage biotechnology company based in Boston, Massachusetts, founded in 2018-2019.United States$161M
AAVantgarde BioAAVantgarde Bio is developing gene therapies for inherited retinal disorders.Italy$141M
Sidewinder TherapeuticsSidewinder Therapeutics is a biotechnology company that offers life-saving therapies for cancer and rare diseases.United States$137M
Lassen TherapeuticsLassen Therapeutics is a clinical-stage biopharmaceutical company based in San Diego, California.United States$85M
TScan TherapeuticsTScan Therapeutics is a biopharmaceutical company focused on the development of immunotherapy treatments for cancer.United States$78M
XyloCor TherapeuticsXyloCor Therapeutics is a bio-pharmaceutical company intended to develop gene therapy for people with advanced coronary artery disease.United States$68M
Avenzo TherapeuticsDeveloping the next generation of oncology therapies for patients.United States$60M
Series A
10 startups · $724M raised
Tome BiosciencesTome Biosciences is a biotechnology company based in Watertown, MA, focused on advancing programmable genomic integration (PGI) toUnited States$213M
Newleos TherapeuticsNewleos Therapeutics is a clinical-stage neuroscience and biotechnology company based in Boston, Massachusetts.United States$94M
Photys TherapeuticsPhotys Therapeutics is a biotechnology and pharmaceutical research company founded in 2021 and based in Waltham, Massachusetts.United States$75M- 2T27-8 TherapeuticsUnited States$65M
- PTProgentos TherapeuticsProgentos Therapeutics develops an approach to treat multiple sclerosis that stimulates the body's natural repair mechanisms.United States$65M
- WTWereworld TherapeuticsUnited States$56M
ImmuneIDImmuneID is a precision immunology company.-$50M
Solu TherapeuticsSolu Therapeutics is a Boston-based clinical-stage biotechnology company focused on developing precision medicines to target and eUnited States$41M
Series C and later
4 startups · $427M raised
ArcherDXArcherDX is a biotechnology firm specializing in cancer research.United States$150M
Calithera BiosciencesCalithera Biosciences is a pharmaceutical company developing novel small molecule therapeutics for the treatment of cancer.United States$115M
PulmocidePulmocide is a private biopharmaceutical company based in London, United Kingdom, founded in 2007.United Kingdom$110M
Channel MedsystemsChannel Medsystems is a medical device company offering cryotherapy devices for endometrial cryoablation.United States$52M
Stage not reported
2 startups · $175M raised
EvommuneEvommune is a biotechnology company that develops therapeutics that halt progressive disease and address their symptoms.United States$125M
Werewolf TherapeuticsWerewolf Therapeutics operates as an oncology biotherapeutics company.United States$50M
How this map is made. Every startup here works in Biotech and has raised money in a round we track that names Longwood Fund as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026.
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