Third Arc Bio Funding, Investors & Competitors

Third Arc Bio has raised $217M across 2 funding rounds, most recently a $52M Series A in February 2026.

Last Third Arc Bio funding round

$52M

Series A · Feb 2026

Cumulative funding Third Arc Bio raised

$217M

across 2 funding rounds

Key investors in Third Arc Bio

  • Hillhouse Investment
  • Andreessen Horowitz
  • T. Rowe Price
  • Goldman Sachs Asset Management
  • Cormorant Asset Management
  • Omega Funds
  • Biotechnology Value Fund
  • AbbVie

Third Arc Bio Overview

About Third Arc Bio

Third Arc Bio is a clinical-stage biotechnology company based in Spring House, Pennsylvania, developing multifunctional antibodies that generate immune synapses to precisely activate or inhibit T cells. The company focuses on oncology and immunology & inflammation, with platforms including ARCStim for solid tumors and ARCTag for precision immune regulation. Its lead asset, ARC101, is a bispecific T cell engager targeting CLDN6 that is in Phase 1 dose escalation for advanced solid tumors.


Founded

2022

HQ

United StatesUnited States

Status

Privately held

Customer focus

B2B

Revenue model

Licensing

Third Arc Bio Funding History

Third Arc Bio has raised a total of $217M across 2 funding rounds.

Third Arc Bio's first fundraising round was a $165M Series A in July 2024. The most recent completed round was a $52M Series A in February 2026.

Third Arc Bio funding rounds

Third Arc Bio funding rounds
DateStageInvestorsRaisedDeal Summary
Feb 2026Series AAndreessen Horowitz (lead); Alderline Group; Marshall Wace; AbbVie; Biotechnology Value Fund; Aberdeen Investments; Hillhouse Investment; T. Rowe Price; Omega Funds; Lakefront Biotherapeutics; Goldman Sachs Asset Management$52MThird Arc Bio, a clinical-stage biotechnology company based in Spring House, Pennsylvania, develops multifunctional antibodies that generate immune synapses to precisely activate or inhibit T cells, focusing on oncology and immunology & inflammation (I&I) with platforms including ARCStim for solid tumors and ARCTag for precision immune regulation. Launched in 2022 with seed financing from Omega Funds, the company has assembled a team with drug discovery expertise and a pipeline of multispecific antibodies. Its lead asset, ARC101, is a bispecific T cell engager targeting CLDN6 in Phase 1 dose escalation for advanced solid tumors. On February 4, 2026, Third Arc Bio closed a $52 million Series A extension financing, led by new investor Andreessen Horowitz (a16z) with participation from founding investor Omega Funds and others including Goldman Sachs Alternatives, BVF Partners LP, abrdn, T. Rowe Price Associates, Marshall Wace, Hillhouse Investment, Galapagos NV, AbbVie Ventures, and Alderline Group. This extension adds to a previously announced $165 million Series A, bringing total Series A funding to $217 million. As part of the deal, a16z General Partner Jorge Conde joined the board of directors. Proceeds will accelerate the I&I portfolio into first-in-human studies and advance additional oncology programs into the clinic, enabling parallel-tracking to validate platforms, generate proof-of-concept data, and deliver therapies for unmet needs in oncology and immunology.
Jul 2024Series ACormorant Asset Management (lead); Hillhouse Investment (lead); Vida Ventures (lead)$165MThird Arc Bio is a Boston-based biotech company developing multifunctional antibodies that generate immune synapses to precisely activate or inhibit T cells, targeting solid tumors and inflammatory & immunology (I&I) diseases through a solid tumor synergy platform and a novel I&I platform for tissue-specific immune regulation. The company was formed in 2022 with seed financing from Omega Funds and launched publicly with an oversubscribed $165 million Series A round on July 16, 2024, raising funds to advance multiple programs into clinical trials starting early 2025. The round was led by Vida Ventures, co-led by Cormorant Asset Management and Hillhouse Investment, with participation from Omega Funds, Goldman Sachs Alternatives, BVF Partners LP, T. Rowe Price Associates, Janus Henderson Investors, abrdn, Marshall Wace, Foresite Capital, Logos Capital, Freepoint Capital Group, and AbbVie Ventures. Leadership includes CEO Peter F. Lebowitz, MD, PhD; Chief Scientific Officer Sanjaya Singh, PhD, former global head of Janssen Biotherapeutics at Johnson & Johnson and key developer of AbbVie's Skyrizi; and COO Joe Erhardt, PhD, former global head of oncology discovery at J&J. The team has collectively commercialized 19 drugs. The post-money valuation for the Series A was $305.43 million at a $2.10 price per share, with total funding reaching $197.75 million including prior seed. The substantial financing reflects strong investor confidence in Third Arc Bio's discovery engine and pipeline poised for IND filings in 2025, aiming to deliver best-in-class biologics leveraging T cell biology for oncology and autoimmunity unmet needs. The round positions the company for clinical inflection points amid competition in T cell engagers and precision immunology therapies.

Who has invested in Third Arc Bio?

13 investors have backed Third Arc Bio across its funding rounds, including Hillhouse Investment, Andreessen Horowitz, T. Rowe Price, Goldman Sachs Asset Management, Cormorant Asset Management and Omega Funds.

Lead investors include Andreessen Horowitz, Cormorant Asset Management, Hillhouse Investment and Vida Ventures.


Third Arc Bio Investors

Investors in Third Arc Bio by funding rounds participated
InvestorHQRoundsRoleFirst check
Hillhouse InvestmentSingaporeSingapore2LeadJul 2024
Vida VenturesUnited StatesBoston, MA1LeadJul 2024
Alderline GroupUnited StatesNew York City, NY1ParticipantFeb 2026
Marshall WaceUnited KingdomLondon1ParticipantFeb 2026
AbbVieUnited StatesChicago, IL1ParticipantFeb 2026
Biotechnology Value FundUnited StatesSan Francisco, CA1ParticipantFeb 2026
Aberdeen InvestmentsUnited StatesScotland, SD1ParticipantFeb 2026
T. Rowe PriceUnited StatesBaltimore, MD1ParticipantFeb 2026
Andreessen HorowitzUnited StatesSan Francisco, CA1LeadFeb 2026
Omega FundsUnited StatesBoston, MA1ParticipantFeb 2026
Lakefront BiotherapeuticsBelgiumHasselt1ParticipantFeb 2026

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Third Arc Bio Competitors

Third Arc Bio competitors include listed companies like Eli Lilly, Johnson & Johnson, AbbVie and Merck, and private ones like Biosplice Therapeutics and Biocon Biologics.

Public and private companies comparable to Third Arc Bio
CompanyHQStatusRevenueEBITDAValuationRevenue Multiple
Eli LillyUnited StatesUnited StatesPublicly listed$65B$28B$1.0T13.1x
Johnson & JohnsonUnited StatesUnited StatesPublicly listed$94B$40B$651B6.8x
AbbVieUnited StatesUnited StatesPublicly listed$61B$17B$467B8.1x
MerckUnited StatesUnited StatesPublicly listed$65B$28B$363B6.2x
Biosplice TherapeuticsUnited StatesSan Diego, CAPrivate--$12B-
Biocon BiologicsIndiaBangalorePrivate$1.1B-$4.5B4.2x

Third Arc Bio Public Comps

Third Arc Bio is still privately-owned, but its public comps include Eli Lilly, Johnson & Johnson, AbbVie, Merck, Roche, Novartis, AstraZeneca, Amgen, Novo Nordisk and Gilead Sciences.

Last FYEV/RevenueEV/EBITDA
RevenueEBITDALast FYLTM2027ELast FYLTM2027E
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
Amgen$37B$17B6.8x6.5x14.8x14.4x

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Common questions about Third Arc Bio

When was Third Arc Bio founded?Third Arc Bio was founded in 2022.
Where is Third Arc Bio headquartered?Third Arc Bio is headquartered in United States.
Is Third Arc Bio publicly listed?No, Third Arc Bio is a private, VC-backed company.
How much funding has Third Arc Bio raised?Third Arc Bio has raised $217M across 2 funding rounds.
What was Third Arc Bio's last funding round?Third Arc Bio's last funding round was a $52M Series A in February 2026, led by Andreessen Horowitz.
Who are Third Arc Bio's investors?Third Arc Bio's investors include Hillhouse Investment, Vida Ventures, Alderline Group, Marshall Wace, AbbVie, Biotechnology Value Fund, Aberdeen Investments, T. Rowe Price, Andreessen Horowitz, Omega Funds and 3 others.
Which companies are comparable to Third Arc Bio?Companies comparable to Third Arc Bio include Eli Lilly, Johnson & Johnson, AbbVie, Merck, Biosplice Therapeutics and Biocon Biologics.

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