Icosavax Acquisition, Valuation, Funding & Investors

Icosavax was acquired by AstraZeneca for $1.1B in December 2023.

Icosavax acquisition price

$1.1B

Acquired by AstraZeneca · Dec 2023

Cumulative funding Icosavax raised

$151M

across 2 funding rounds

Key investors in Icosavax

  • Adams Street Partners
  • Sanofi Ventures
  • +ND Capital
  • Qiming Venture Partners USA
  • RA Capital Management
  • Cormorant Asset Management
  • Perceptive Advisors
  • Viking Global Investors

Icosavax Overview

About Icosavax

Icosavax is a Seattle-based biopharmaceutical company developing vaccines using virus-like particle technology for respiratory diseases. Formed in 2017 from University of Washington research, its pipeline targets RSV, hMPV, and SARS-CoV-2 with multivalent antigens for broad immunity. Icosavax advanced candidates to Phase 2 trials and was acquired by AstraZeneca in 2023.


Founded

2017

HQ

United StatesSeattle, WA

Status

Acquired

Customer focus

B2B

Revenue model

Licensing

Valuation

$1.1B (acquired Dec 2023)

Icosavax Acquisition

Icosavax was acquired by AstraZeneca for $1.1B on 12 December 2023.

Before the acquisition Icosavax had raised $151M across 2 funding rounds.

Icosavax acquisition details
AcquirerDateTypePrice
12 Dec 2023Strategic M&A$1.1B

Icosavax Funding History

Icosavax has raised a total of $151M across 2 funding rounds.

Icosavax's first fundraising round was a $51M Series A in October 2019. The most recent completed round was a $100M Series B in April 2021.

Icosavax funding rounds

Icosavax funding rounds
DateStageInvestorsRaisedDeal Summary
Apr 2021Series BRA Capital Management (lead); Adams Street Partners; Open Philanthropy; +ND Capital; Janus Henderson; Omega Funds; Qiming Venture Partners USA; Viking Global Investors; Sanofi Ventures; Cormorant Asset Management; Surveyor Capital; Perceptive Advisors$100MIcosavax, a Seattle-based biotech company founded in 2017, develops computationally designed virus-like particle (VLP) vaccines targeting respiratory viruses such as RSV, hMPV, and COVID-19, leveraging technology from the University of Washington’s Institute for Protein Design to address manufacturing challenges and provide durable protection for at-risk populations like the elderly. In April 2021, Icosavax closed a $100 million Series B financing round led by RA Capital Management, with participation from Janus Henderson Investors, Perceptive Advisors, Viking Global Investors, Cormorant Asset Management, Omega Funds, Surveyor Capital, and existing investors including Qiming Venture Partners USA, Adams Street Partners, Sanofi Ventures, ND Capital, and a prior commitment from Open Philanthropy. Peter Kolchinsky, founder and managing partner of RA Capital, joined the board. This followed a $51 million Series A approximately 18 months earlier. The proceeds fund advancement of the bivalent RSV/hMPV vaccine candidate IVX-A12 into initial clinical studies, the RSV vaccine IVX-121 (incorporating NIH-licensed stabilized prefusion F antigen DS-Cav1, which showed strong neutralizing antibodies in a prior Phase 1 by NIAID/NIH) into the clinic, evaluation of a COVID-19 vaccine candidate, and pipeline expansion. No approved vaccines existed for RSV or hMPV at the time, highlighting significant unmet needs in pneumonia prevention for older adults. Icosavax planned an IPO, filing confidentially in May 2021 and publicly in July 2021 to raise up to $100 million under symbol ICVX, with bookrunners Jefferies, Cowen, Evercore ISI, and William Blair. The company had also received a $10 million grant from the Bill & Melinda Gates Foundation for its COVID-19 program.
Oct 2019Series AQiming Venture Partners USA (lead); Adams Street Partners; +ND Capital; Sanofi; Sanofi Ventures$51MIcosavax, a Seattle-based vaccine developer spun out from the University of Washington’s Institute for Protein Design, launched in October 2019 with a $51 million Series A financing round led by Qiming Venture Partners USA, joined by Adams Street Partners, Sanofi Ventures, and ND Capital (formerly NanoDimension), plus seed investors. The company focuses on computationally designed self-assembling virus-like particle (VLP) technology to create vaccines for viruses like respiratory syncytial virus (RSV) targeting older adults, with its lead candidate IVX-121 advancing to Phase 1b clinical studies. Proceeds funded clinical advancement of IVX-121 and platform expansion for unmet needs in vaccine efficacy and manufacturing. The round matched the specified investors and approximate date, confirming the exact financing event, though amounts vary slightly as $51M or $52M across reports. Icosavax emerged from stealth with this capital after seed funding from philanthropic supporters, enabling team assembly and translation of IPD research published in Cell 2019. CEO Adam Simpson highlighted the investor syndicate's expertise for clinic entry and broader VLP applications. No valuation, revenue, ARR, or EBITDA figures appear for this early-stage biotech round, typical for pre-revenue vaccine startups. Subsequent $100M Series B in April 2021 led by RA Capital included the same Series A investors plus others, funding bivalent RSV/human metapneumovirus vaccines, COVID-19 evaluation, and pipeline growth. Icosavax later went public in 2021 with a $182M IPO on Nasdaq, shares surging from $15 priced to $35 close.

Who has invested in Icosavax?

13 investors have backed Icosavax across its funding rounds, including Adams Street Partners, Sanofi Ventures, +ND Capital, Qiming Venture Partners USA, RA Capital Management and Cormorant Asset Management.

Lead investors include RA Capital Management and Qiming Venture Partners USA.


Icosavax Investors

Investors in Icosavax by funding rounds participated
InvestorHQRoundsRoleFirst check
Adams Street PartnersUnited StatesChicago, IL2ParticipantOct 2019
+ND CapitalUnited StatesSan Francisco, CA2ParticipantOct 2019
Qiming Venture Partners USAUnited StatesUnited States2LeadOct 2019
Sanofi VenturesUnited StatesUnited States2ParticipantOct 2019
Open PhilanthropyUnited StatesSan Francisco, CA1ParticipantApr 2021
Janus HendersonUnited StatesLondon1ParticipantApr 2021
SanofiFranceParis1ParticipantOct 2019
Omega FundsUnited StatesBoston, MA1ParticipantApr 2021
RA Capital ManagementUnited StatesBoston, MA1LeadApr 2021
Viking Global InvestorsUnited StatesStamford, CT1ParticipantApr 2021
Cormorant Asset ManagementUnited StatesBoston, MA1ParticipantApr 2021

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Icosavax Competitors

Icosavax competitors include listed companies like Philogen, CStone Pharmaceuticals, Ribolia and Jade Biosciences, and private ones like Letu and Formation Bio.

Public and private companies comparable to Icosavax
CompanyHQStatusRevenueEBITDAValuationRevenue Multiple
PhilogenItalyItalyPublicly listed$362M$303M$1.1B5.9x
CStone PharmaceuticalsChinaChinaPublicly listed$40M($56M)$1.1B16.3x
RiboliaChinaChinaPublicly listed$22M($32M)$1.1B15.7x
LetuChinaShenzhenPrivate--$1.1B-
Jade BiosciencesUnited StatesUnited StatesPublicly listed-($135M)$1.1B-
Formation BioUnited StatesNew York City, NYPrivate--$1B-
Last FYEV/RevenueEV/EBITDA
RevenueEBITDALast FYLTM2027ELast FYLTM2027E
Philogen$362M$303M1.9x5.9x2.2x11.0x
CStone Pharmaceuticals$40M($56M)22.8x16.3x(16.3x)(15.1x)
Ribolia$22M($32M)39.3x15.7x(26.9x)(39.5x)
Jade Biosciences-($135M)--(4.7x)-
Savara-($123M)-505.5x(7.9x)-
Odyssey Therapeutics$3M($151M)279.0x973.1x(5.5x)(4.8x)
Kissei Pharmaceutical$626M$138M1.2x1.2x5.5x17.2x
Obsidian Therapeutics-($104M)--(13.0x)-

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Common questions about Icosavax

When was Icosavax founded?Icosavax was founded in 2017.
Where is Icosavax headquartered?Icosavax is headquartered in Seattle, WA, United States.
Is Icosavax publicly listed?No, Icosavax was acquired by AstraZeneca in December 2023.
Who acquired Icosavax?Icosavax was acquired by AstraZeneca in December 2023.
How much was Icosavax acquired for?Icosavax was acquired for $1.1B in December 2023.
How much funding has Icosavax raised?Icosavax has raised $151M across 2 funding rounds.
What was Icosavax's last funding round?Icosavax's last funding round was a $100M Series B in April 2021, led by RA Capital Management.
Who are Icosavax's investors?Icosavax's investors include Adams Street Partners, +ND Capital, Qiming Venture Partners USA, Sanofi Ventures, Open Philanthropy, Janus Henderson, Sanofi, Omega Funds, RA Capital Management, Viking Global Investors and 3 others.
Which companies are comparable to Icosavax?Companies comparable to Icosavax include Philogen, CStone Pharmaceuticals, Ribolia, Letu, Jade Biosciences and Formation Bio.

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