Third Harmonic Bio Funding, Investors & Competitors

Third Harmonic Bio has raised $155M across 2 funding rounds, most recently a $105M Series B in January 2022.

Last Third Harmonic Bio funding round

$105M

Series B · Jan 2022

Cumulative funding Third Harmonic Bio raised

$155M

across 2 funding rounds

Key investors in Third Harmonic Bio

  • Biotechnology Value Fund
  • OrbiMed
  • RA Capital Management
  • General Atlantic
  • Atlas Venture
  • Boxer Capital
  • RTW Investments
  • Deep Track Capital

Third Harmonic Bio Overview

About Third Harmonic Bio

Third Harmonic Bio is a Cambridge-headquartered clinical-stage biopharmaceutical company advancing THB335, an oral KIT inhibitor targeting mast cell-driven inflammation in chronic urticaria and other allergies. The drug selectively blocks KIT receptor signaling on immune cells at barrier sites, with Phase 1 trials completed in 2023 showing favorable safety.


Founded

2019

HQ

United StatesUnited States

Status

Privately held

Customer focus

B2B

Revenue model

Licensing

Third Harmonic Bio Funding History

Third Harmonic Bio has raised a total of $155M across 2 funding rounds.

Third Harmonic Bio's first fundraising round was a $50M Series A in January 2019. The most recent completed round was a $105M Series B in January 2022.

Third Harmonic Bio funding rounds

Third Harmonic Bio funding rounds
DateStageInvestorsRaisedDeal Summary
Jan 2022Series BBiotechnology Value Fund (lead); General Atlantic (lead); Boxer Capital; RTW Investments; Deep Track Capital; RA Capital Management; Commodore Capital; Ajax Health$105MThird Harmonic Bio is a clinical-stage biotechnology company developing THB001, a first-in-class, highly selective oral KIT inhibitor targeting mast cell-driven severe allergies and inflammation, including chronic urticaria, asthma, and gastrointestinal disorders. The company licensed the compound from Novartis in 2019 for a small upfront payment, equity stake, milestones up to $31.7 million, and commercial payments up to $200 million. THB001 completed Phase 1a trials in healthy volunteers and was advancing to a Phase 1b proof-of-concept study in cold-induced urticaria planned for the second half of 2022, with data expected mid-2023 and potential Phase 2 in chronic spontaneous urticaria in 2024. The Series B round, closed in December 2021 and announced February 2022, raised $105 million led by General Atlantic and co-led by BVF Partners (Biotechnology Value Fund), with participation from Atlas Venture, OrbiMed, Boxer Capital, RA Capital Management, RTW Investments, Deep Track Capital, Ajax Health/Zeus, and Commodore Capital. This followed a $50 million Series A in 2019 co-led by Atlas and OrbiMed with BVF, bringing total funding to $155 million at launch. The capital was intended to fund operations beyond completion of the Phase 1b urticaria study, support headcount growth from 14 to about 30 employees by end-2022 including key C-suite hires, and advance clinical development. The company had $113 million cash on hand as of June 2022. Third Harmonic launched publicly with the Series B announcement, led by CEO Natalie Holles (former Audentes CEO), CMO Stephen Yoo, and COO Howard Davis. It competes in the mast cell modulation space against players like Novartis' Xolair (2021 revenue over $1.4 billion) and Celldex, positioning THB001 as a more selective small molecule with dosing advantages over antibodies. Subsequently, Third Harmonic filed for a $150 million IPO in August 2022, listing on Nasdaq as THRD, and completed it raising $185.3 million from 10.7 million shares at $17 per share.
Jan 2019Series AAtlas Venture (lead); OrbiMed (lead); Biotechnology Value Fund$50MThird Harmonic Bio was founded in 2019 by Atlas Venture with initial Series A funding of $50 million led by Atlas Venture and OrbiMed, with additional participation from BVF Partners. The company is a clinical-stage biotechnology firm focused on developing novel immunotherapies for severe allergic and inflammatory diseases, including a lead candidate THB001 targeting mast cell-driven conditions such as chronic urticaria. Following the Series A, Third Harmonic closed a Series B financing in December 2021 for $105 million in new capital (bringing total raised to $155 million), co-led by General Atlantic and BVF with participation from Atlas, OrbiMed, Boxer Capital, RA Capital, RTW, Deep Track Capital, Ajax Health/Zeus, and Commodore Capital. The company was led by Natalie Holles, former CEO of Audentes Therapeutics, who joined in August 2021 to lead the organization toward its public launch. As a pre-clinical and early-stage clinical company throughout the 2019-2022 period, Third Harmonic Bio reported zero revenue and operated at significant losses, with net losses of approximately $30.8 million in 2023 and $45.5 million in 2024 as development activities accelerated.

Who has invested in Third Harmonic Bio?

10 investors have backed Third Harmonic Bio across its funding rounds, including Biotechnology Value Fund, OrbiMed, RA Capital Management, General Atlantic, Atlas Venture and Boxer Capital.

Lead investors include Biotechnology Value Fund, General Atlantic, Atlas Venture and OrbiMed.


Third Harmonic Bio Investors

Investors in Third Harmonic Bio by funding rounds participated
InvestorHQRoundsRoleFirst check
Biotechnology Value FundUnited StatesSan Francisco, CA2LeadJan 2019
Boxer CapitalUnited StatesOrlando, FL1ParticipantJan 2022
RTW InvestmentsUnited StatesNew York City, NY1ParticipantJan 2022
Atlas VentureUnited StatesUnited States1LeadJan 2019
General AtlanticUnited StatesNew York City, NY1LeadJan 2022
Deep Track CapitalUnited StatesGreenwich, CT1ParticipantJan 2022
RA Capital ManagementUnited StatesBoston, MA1ParticipantJan 2022
OrbiMedUnited StatesNew York City, NY1LeadJan 2019

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Third Harmonic Bio Competitors

Third Harmonic Bio competitors include listed companies like Johnson & Johnson and Roche, and private ones like Biosplice Therapeutics, Biomat USA, ArsenalBio and BioRay Pharmaceuticals.

Public and private companies comparable to Third Harmonic Bio
CompanyHQStatusRevenueEBITDAValuationRevenue Multiple
Johnson & JohnsonUnited StatesUnited StatesPublicly listed$94B$40B$651B6.8x
RocheSwitzerlandSwitzerlandPublicly listed$77B$26B$351B4.9x
Biosplice TherapeuticsUnited StatesSan Diego, CAPrivate--$12B-
Biomat USAUnited StatesLos Angeles, CAPrivate--$4.2B-
ArsenalBioUnited StatesUnited StatesPrivate--$1.9B-
BioRay PharmaceuticalsChinaShanghaiPrivate$131M-$1.9B14.5x

Third Harmonic Bio Public Comps

Third Harmonic Bio is still privately-owned, but its public comps include Samsung, Eli Lilly, Johnson & Johnson, AbbVie, Merck, Roche, Novartis, AstraZeneca, Thermo Fisher Scientific and Siemens.

Last FYEV/RevenueEV/EBITDA
RevenueEBITDALast FYLTM2027ELast FYLTM2027E
Samsung$243B$67B4.4x2.4x15.8x4.4x
Eli Lilly$65B$28B16.5x13.1x38.7x27.0x
Johnson & Johnson$94B$40B7.2x6.8x17.0x18.3x
AbbVie$61B$17B8.7x8.1x30.6x17.6x
Merck$65B$28B6.3x6.2x14.7x21.0x
Roche$77B$26B5.0x4.9x14.6x12.4x
Novartis$57B$22B5.5x5.5x14.2x13.3x
AstraZeneca$59B$19B4.8x4.5x14.6x12.7x

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Common questions about Third Harmonic Bio

When was Third Harmonic Bio founded?Third Harmonic Bio was founded in 2019.
Where is Third Harmonic Bio headquartered?Third Harmonic Bio is headquartered in United States.
Is Third Harmonic Bio publicly listed?No, Third Harmonic Bio is a private, VC-backed company.
How much funding has Third Harmonic Bio raised?Third Harmonic Bio has raised $155M across 2 funding rounds.
What was Third Harmonic Bio's last funding round?Third Harmonic Bio's last funding round was a $105M Series B in January 2022, led by Biotechnology Value Fund and General Atlantic.
Who are Third Harmonic Bio's investors?Third Harmonic Bio's investors include Biotechnology Value Fund, Boxer Capital, RTW Investments, Atlas Venture, General Atlantic, Deep Track Capital, RA Capital Management, OrbiMed, Commodore Capital and Ajax Health.
Which companies are comparable to Third Harmonic Bio?Companies comparable to Third Harmonic Bio include Johnson & Johnson, Roche, Biosplice Therapeutics, Biomat USA, ArsenalBio and BioRay Pharmaceuticals.

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