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About Xontogeny

Xontogeny, an accelerator and incubator program founded in 2016, is based in Boston, United States. With a presence in 4 countries, it has supported around 28 startups in sectors like Life Sciences, High Tech. As of Jun 2026, Xontogeny has witnessed 10 portfolio exits. Most notable companies in its portfolio include Forge Biologics, Astria Therapeutics and Apogee Therapeutics. The program is backed by a team of 18 people who primarily support Series A startups based in United States. Its latest investment was a $20M Series B round in Zucara Therapeutics on Nov 12, 2024 along with Sanofi.
Key Metrics
Founded Year
2016
Location
Sectors of Investment
Stages of Investment
Series A, Seed & 3 more
Locations of Investment

Xontogeny's List of Top Investments

Xontogeny has a portfolio of 28 companies. Their most notable investments are in Quellis Biosciences and Surf Bio.Their portfolio spans across United States, Canada, China and 1 more locations. They have invested in Life Sciences, High Tech, Consumer and 2 other sectors, across stages such as Series A, Seed  and 3 more. Here is the list of top investments by Xontogeny:
Developer of gene therapeutic solutions for treating multiple diseases. It has developed gene therapies that aim to help patients suffering from rare diseases. Products include FBX-101 which helps to treat infantile Krabbe diseases, FBX-201 for rare and monogenic diseases, and FBX-301 for rare & cancer diseases.

Key facts about Forge Biologics

Developer of therapeutics for rare diseases. It offers a lead candidate STAR-0215 which is a monoclonal antibody inhibitor of plasma kallikrein for the treatment of hereditary angioedema, and allergic and immunological diseases.

Key facts about Astria Therapeutics

  • Founded Year: 2008
  • Location: Boston (United States)
  • Last Known Valuation: $*****
  • Stage: Acquired
  • Total Funding till date: $117M
  • Employee Count: 58 as on Apr 30, 2026
  • Investors: HHS, Xontogeny and 3 Others
  • Latest Funding Round: Post IPO, Jan 29, 2021, $*****
  • Highlight: Acquired
Developer of therapeutics for immunological and inflammatory disorders. The company is advancing a pipeline of product candidates, which includes APG777, for the treatment of immunological, inflammatory disorders, and autoimmune disorders.

Key facts about Apogee Therapeutics

  • Founded Year: 2022
  • Location: Waltham (United States)
  • Stage: Public
  • Total Funding till date: $149M
  • Employee Count: 305 as on Apr 30, 2026
  • Investors: Fairmont, Orbimed and 5 Others
  • Latest Funding Round: Series B, Dec 07, 2022, $*****
  • Highlight: Public
Developer of cell-based therapeutics for cancer treatment. It offers CAR T-cell therapies which include CD22 CAR T, and Multi-Specific CAR T drug candidates for the treatment of hematological malignancies, and solid tumors.

Key facts about Cargo Therapeutics

Developer of antibody-based therapeutics for the treatment of cancer. The company's lead candidate, TORL-1-23, is a CLDN6-directed antibody-drug conjugate for patients across multiple cancer types. Also, it is developing a broad pipeline of novel preclinical ADCs and mAb in oncologic indications.

Key facts about TORL BioTherapeutics

  • Founded Year: 2019
  • Location: Los Angeles (United States)
  • Stage: Series C
  • Total Funding till date: $412M
  • Employee Count: 63 as on Apr 30, 2026
  • Investors: Cowen, Bristol-Myers Squibb and 8 Others
  • Latest Funding Round: Series C, Oct 07, 2025, $*****
  • Highlight: Editors' Pick

Xontogeny's Investments by Stage

Xontogeny has made 11 investments in Series A stage with an average round size of $55.9M, 7 investments in Seed stage with an average round size of $6.59M, 2 investments in Series B stage with an average round size of $89M, 1 investment in Series C stage with an average round size of $189M and 1 investment in Unattributed stage.
Here are Xontogeny's investments by stage:
Stage of entry
No. of Investments
Series A
11
Seed
7
Series B
2
Series C
1
Unattributed
1
Breakdown of Xontogeny's investments by stage of entrySeries A (11)Seed (7)
Note: We have considered here, only first round of investments

Xontogeny's Investments by Sector

Xontogeny has a diverse portfolio, with companies operating in the Life Sciences, High Tech, Sustainability Tech, Consumer and Environment. Notably, it has invested in 27 Enterprise (B2B) companies, 27 Tech companies and 1 Tech hardware company.
Here are Xontogeny's investments by sector:
Sector
No. of Investments
Life Sciences
21
High Tech
2
Sustainability Tech
2
Consumer
1
Environment
1
Others
1
Breakdown of Xontogeny's investments by sectorsLife Sciences (21)High Tech (2)
Note: We have considered here, only first round of investments

Xontogeny's Investments by Geography

Xontogeny has made most investments in United States (20), followed by Canada where it has made 1 investment.
Here are Xontogeny's investments by geography:
Country
No. of Investments
United States
20
Canada
1
Switzerland
1
Breakdown of Xontogeny's investments by countriesUnited States (20)Canada (1)
Note: We have considered here, only first round of investments

Xontogeny's recent investments

Xontogeny has not made any investment in 2026 so far.
Here are the most recent investments by Xontogeny:
Date
Company
Location
Round Details
Round Amount
Co-Investors
Nov 12, 2024
Canada
Series B
9963
May 13, 2024
United States
Series B
1658
Apr 24, 2024
United States
Series A
9517
  [+1]
Apr 03, 2024
Switzerland
Series A
2605
Sep 27, 2023
United States
Series C
6833

IPOs and Publicly Listed companies in Xontogeny's Portfolio

4 of Xontogeny's portfolio companies have become public. Avalyn Pharma got listed on the National Association of Securities Dealers Automated Quotations (NASDAQ), in Apr 2026 at marketcap of $753M and Apogee Therapeutics got listed on the National Association of Securities Dealers Automated Quotations (NASDAQ) at marketcap of $809M.
Here are Xontogeny's portfolio companies that went public:
Company
IPO Date
First Invested on
First Round of Investment
Round Size
Apr 30, 2026
Sep 27, 2023
Series C
4385
Jul 14, 2023
-
-
9589
Nov 01, 2021
-
-
4181
Jan 26, 2018
-
-
2817

Acquired companies in Xontogeny's Portfolio

6 companies from Xontogeny's portfolio have been acquired. The most recent acquisition was Surf Bio in Jan 2026 by Halozyme for $*****.
Here are Xontogeny's portfolio companies that got acquired most recently:
Company
Acquisition Date
First Invested on
First Round of Investment
Round Size
Jan 28, 2026
Apr 12, 2022
Seed
2347
Oct 14, 2025
-
-
5557
Jul 08, 2025
Feb 09, 2023
Series A
5370
Mar 25, 2024
-
-
9381
Nov 13, 2023
Jul 21, 2020
Series A
2809

Team profile of Xontogeny

Xontogeny has a team of 18 members including 4 Partners and 2 Principals located in United States. Xontogeny's team does not sit on the board of any company as of now.
Here is a list of top team members in Xontogeny:
Name
Designation
Location
Board Memberships
Contact Details
Partner
New York City
-
-
Partner
San Francisco
-
-
Partner
Boston
-
-
Partner
New York City
-
-
Principal
Cambridge
-
-
Principal
New York City
-
-

Co-investors of Xontogeny

Over the past 9 years, 106 investors have co-invested in Xontogeny's portfolio companies. This includes funds and angels.

  • Invested before XontogenyHHS, F-Prime Capital and 43 others have invested in rounds before Xontogeny. There are 4 companies where HHS has invested before Xontogeny and 1 company where F-Prime Capital has invested before Xontogeny.
  • Top Co-investors of Xontogeny47 investors entered a company along with Xontogeny. These include investors like Perceptive Advisors (4 companies).
  • Invested after XontogenyA total of 14 investors have invested in Xontogeny's portfolio after their investments. Top Investors include Perceptive Advisors (3 companies) and Citadel (2 companies).

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