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- Leyden Labs
Leyden Labs Funding, Investors & Competitors
Leyden Labs has raised $338M across 5 funding rounds, most recently a $47M undisclosed-stage round in June 2026.
Last Leyden Labs funding round
$47M
Undisclosed stage · Jun 2026
Cumulative funding Leyden Labs raised
$338M
across 5 funding rounds
Key investors in Leyden Labs
GV
Casdin Capital
F-Prime
European Innovation Council
Invest-NL
ClavystBio
Brook Byers
SoftBank Group
About Leyden Labs
Leyden Labs is a Boston-headquartered biotech company engineering intranasal vaccines targeting RNA viruses like influenza and coronaviruses. Its lead candidates use nanoparticle delivery for broad-spectrum protection against 10+ strains, administered without needles. Backed by ARCH Venture Partners, the team advances Phase 1 trials for RSV and flu combos. Founded in 2021, Leyden collaborates with BARDA for pandemic preparedness stockpiles.
Founded
2020
HQ
Website
Status
Privately held
Customer focus
B2B
Revenue model
Product sales
Leyden Labs Funding History
Leyden Labs has raised a total of $338M across 5 funding rounds.
Leyden Labs' first fundraising round was a $47M Series A in March 2021. The most recent completed round was a $47M undisclosed-stage round in June 2026.
Leyden Labs funding rounds
| Date | Stage | Investors | Raised | Deal Summary |
|---|---|---|---|---|
| Jun 2026 | Undisclosed stage | European Innovation Council; Bill & Melinda Gates Foundation; ClavystBio; Invest-NL | $47M | - |
| Oct 2025 | Undisclosed stage | European Innovation Council; Invest-NL | $35M | Leyden Labs is a Dutch clinical-stage biotechnology company headquartered in Leiden, developing a mucosal protection platform focused on nasal sprays to prevent respiratory viruses, including its lead PanFlu candidate against influenza and potential applications for other pathogens like coronaviruses. The company secured €30 million in equity financing on October 2, 2025, from the European Innovation Council (EIC) Fund and Invest-NL, with each contributing €15 million, to accelerate clinical development of PanFlu and expand its pipeline. This round builds on prior fundraising, including a $70 million Series B in January 2025 and a €20 million venture debt from the European Investment Bank (EIB) under the HERA Invest program. The investment supports Leyden Labs' mission to enhance Europe's pandemic preparedness by providing preventive protection for vulnerable populations such as the elderly and immunocompromised, addressing limitations of traditional vaccines through nasal delivery that stops viruses at the entry point. Investors highlight the technology's potential to improve healthcare accessibility, affordability, and Europe's health innovation autonomy. Leyden Labs has a global investor syndicate including GV (formerly Google Ventures), Casdin Capital, F-Prime Capital, ClavystBio, and SoftBank Vision Fund 2, spanning the US, Europe, and Asia. |
| Jan 2025 | Series B | ClavystBio (lead); Polaris Partners (lead); GV; Casdin Capital; Qiming Venture Partners | $70M | Leyden Labs, a clinical-stage Dutch biotechnology company founded in 2020, develops a Mucosal Protection Platform for intranasal antibody-based nasal sprays providing broad protection against respiratory viruses like influenza and coronaviruses, including its lead PanFlu candidate with monoclonal antibody CR9114 licensed from Janssen. On January 9, 2025, the company raised $70 million in a funding round co-led by ClavystBio and Polaris Partners, with participation from Qiming Venture Partners and existing investors such as GV and Casdin Capital, to advance its non-vaccine intranasal antibody programs. The investor syndicate now includes GV, Casdin Capital, F-Prime Capital, ClavystBio, Polaris Partners, Qiming Venture Partners, Invus, Byers Capital, Bluebird Ventures, and SoftBank Vision Fund 2. Alongside the financing, Leyden Labs acquired CoV Biotechnology Pte. Ltd., a Singaporean biotech with assets from Duke-NUS professor Linfa Wang, enhancing its R&D for pandemic preparedness and Asian partnerships. The company continues to build traction with additional financings later in 2025, including a €30 million equity investment from the European Innovation Council Fund and Invest-NL in October to accelerate PanFlu clinical development and mucosal pipeline, and a €20 million EIB loan guaranteed by HERA for pandemic preparedness. Leyden Labs' approach targets prophylaxis against seasonal and pandemic threats, positioning it in the biotech space for innovative respiratory virus defenses amid ongoing global health challenges. These funds support clinical advancement of CR9114, which showed preclinical protection against influenza including avian flu strains. |
| Jan 2022 | Series B | Casdin Capital (lead); GV (lead); Bluebird Ventures; SoftBank Group; Invus; F-Prime; Brook Byers | $140M | Leyden Labs, a Netherlands-based biotech founded in June 2020, develops intranasal products for mucosal protection against respiratory viruses including influenza, SARS-CoV-2 variants, and other emerging threats. The company licensed CR9114, a monoclonal antibody for influenza A and B from Janssen, to create an intranasal spray. Led by CEO Koenraad Wiedhaup, the team includes veterans from Crucell, Vir Biotechnology, and Janssen with expertise in infectious diseases and monoclonal antibodies like sotrovimab. On January 25, 2022, Leyden Labs closed a $140M Series B financing round led by Casdin Capital and GV (formerly Google Ventures), with participation from new investors SoftBank Vision Fund 2, Invus, and Bluebird Ventures, plus existing Series A backers F-Prime Capital and Byers Capital/Brook Byers. This brought total capital raised in 2021 to approximately $200M, including a prior $40M Series A in March 2021 also led by Casdin and GV. Proceeds fund preclinical and early-stage development of the platform targeting broad respiratory virus protection at the mucosal entry point. The round expanded the board with Eli Casdin from Casdin Capital and added observers from SoftBank, Bluebird Ventures, and Casdin. At the time, Leyden Labs had a 40-person team focused on pandemic preparedness through on-demand, broad-spectrum intranasal prophylactics. |
| Mar 2021 | Series A | GV (lead); Casdin Capital; F-Prime; Brook Byers | $47M | Leyden Laboratories B.V., founded in June 2020 and based in Amsterdam and Boston, develops a platform targeting commonalities of viral families to protect against known and future viruses, including intranasal product candidates for self-administrable protection against respiratory viruses like influenza and coronaviruses. The company announced the closing of a €40 million (approximately $46.9 million or $47.2 million) Series A financing on March 25, 2021, led by GV (formerly Google Ventures), with participation from F-Prime Capital, Casdin Capital, LLC, and Brook Byers. David Schenkein from GV and Stephen Knight from F-Prime joined the board. Proceeds from the Series A were allocated to develop Leyden Labs’ platform and portfolio of product candidates, as well as to expand the team. This round marked the first disclosed funding for the company, focusing on broad-spectrum mucosal protection rather than vaccines targeting specific variants. Subsequently, Leyden Labs raised a $140 million Series B on January 25, 2022, led by Casdin Capital and GV, with new investors SoftBank Vision Fund 2, Invus, and Bluebird Ventures, plus existing backers, bringing total capital raised in 2021 to approximately $200 million. Later rounds included a $70 million raise in 2024 led by ClavystBio and Polaris Partners. The Series A investors' continued support underscores confidence in the company's intranasal antibody programs, such as PanFlu based on licensed monoclonal antibody CR9114 from Janssen. |
Who has invested in Leyden Labs?
13 investors have backed Leyden Labs across its funding rounds, including GV, Casdin Capital, F-Prime, European Innovation Council, Invest-NL and ClavystBio.
Lead investors include ClavystBio, Polaris Partners, Casdin Capital and GV.
Leyden Labs Investors
| Investor | HQ | Rounds | Role | First check |
|---|---|---|---|---|
| 3 | Lead | Mar 2021 | ||
| 3 | Lead | Mar 2021 | ||
| 2 | Participant | Oct 2025 | ||
| 2 | Lead | Jan 2025 | ||
| 2 | Participant | Mar 2021 | ||
| 2 | Participant | Mar 2021 | ||
| 2 | Participant | Oct 2025 | ||
| 1 | Participant | Jan 2022 | ||
| 1 | Participant | Jan 2022 | ||
| 1 | Lead | Jan 2025 | ||
| 1 | Participant | Jan 2022 | ||
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Benchmark 350K+ Funding Rounds and Disclosed VC Valuation Multiples
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Start Free TrialAcquisitions by Leyden Labs
Leyden Labs has acquired 2 companies to date.
Last acquisition by Leyden Labs was on September 9th 2026. Leyden Labs acquired RIGImmune for undisclosed valuation.
Latest Acquisitions by Leyden Labs
| Description | RIGImmune is a biopharmaceutical company developing RIG-I agonists for treating RNA viruses like influenza and inducing antitumor immunity. Headquartered in Munich, it advances small-molecule and nucleic acid therapeutics through preclinical and Phase I trials. RIGImmune collaborates with academic institutions in Germany and the United States on immuno-oncology applications. | CoV Biotechnology is a biotechnology firm located in Rockville, Maryland, developing diagnostics and therapeutics targeting SARS-CoV-2 variants and emerging coronaviruses. Founded in 2020, the company engineers broad-spectrum monoclonal antibodies and rapid antigen tests detecting Omicron and Delta mutations. CoV Biotech collaborates with CROs for preclinical trials and supplies assays to clinical labs in the United States and Europe. |
| HQ Country | ||
| HQ City | Hartford, CT | Singapore |
| Deal Date | 9 Sep 2026 | 9 Jan 2025 |
| Valuation | undisclosed | undisclosed |
| EV/Revenue | ||
| EV/EBITDA | ||
This data is available for Pro users. Sign up to see all Leyden Labs acquisitions and their M&A valuation multiples. Start Free Trial | ||
Leyden Labs Competitors
Leyden Labs competitors include listed companies like Johnson & Johnson, Shionogi and Eli Lilly, and private ones like NewLimit, MindMaze and BrightInsight.
| Company | HQ | Status | Revenue | EBITDA | Valuation | Revenue Multiple |
|---|---|---|---|---|---|---|
| Private | - | - | $3.1B | - | ||
| Publicly listed | $94B | $40B | $651B | 6.8x | ||
| Publicly listed | $3.2B | $1.2B | $16B | 4.4x | ||
| Private | $8M | - | $1.5B | 187.5x | ||
| Private | - | - | $750M | - | ||
| Publicly listed | $65B | $28B | $1.0T | 13.1x |
Leyden Labs Public Comps
Leyden Labs 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 FY | EV/Revenue | EV/EBITDA | ||||||
|---|---|---|---|---|---|---|---|---|
| Revenue | EBITDA | Last FY | LTM | 2027E | Last FY | LTM | 2027E | |
| $65B | $28B | 16.5x | 13.1x | 38.7x | 27.0x | |||
| $94B | $40B | 7.2x | 6.8x | 17.0x | 18.3x | |||
| $61B | $17B | 8.7x | 8.1x | 30.6x | 17.6x | |||
| $65B | $28B | 6.3x | 6.2x | 14.7x | 21.0x | |||
| $77B | $26B | 5.0x | 4.9x | 14.6x | 12.4x | |||
| $57B | $22B | 5.5x | 5.5x | 14.2x | 13.3x | |||
| $59B | $19B | 4.8x | 4.5x | 14.6x | 12.7x | |||
| $37B | $17B | 6.8x | 6.5x | 14.8x | 14.4x | |||
This data is available for Pro users. Sign up to see all Leyden Labs competitors and their valuation data. Start Free Trial | ||||||||
Common questions about Leyden Labs
| When was Leyden Labs founded? | Leyden Labs was founded in 2020. |
| Where is Leyden Labs headquartered? | Leyden Labs is headquartered in Amsterdam, Netherlands. |
| Is Leyden Labs publicly listed? | No, Leyden Labs is a private, VC-backed company. |
| How much funding has Leyden Labs raised? | Leyden Labs has raised $338M across 5 funding rounds. |
| What was Leyden Labs' last funding round? | Leyden Labs' last funding round was a $47M undisclosed-stage round in June 2026. |
| Who are Leyden Labs' investors? | Leyden Labs' investors include GV, Casdin Capital, European Innovation Council, ClavystBio, F-Prime, Brook Byers, Invest-NL, Bluebird Ventures, SoftBank Group, Polaris Partners and 3 others. |
| Which companies are comparable to Leyden Labs? | Companies comparable to Leyden Labs include NewLimit, Johnson & Johnson, Shionogi, MindMaze, BrightInsight and Eli Lilly. |
| How many companies has Leyden Labs acquired? | Leyden Labs has acquired 2 companies, including RIGImmune and CoV Biotechnology. |
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