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Excellergy

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Trifunctional inhibitors for severe allergic disease control

Palo Alto, United StatesFounded 2020Biotech & Life Sciences
Valuation $250–500M Last recorded · 2025
Headcount <100 Current team size
Total funding $50–100M Disclosed equity funding
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About Excellergy

Excellergy is a clinical-stage biotechnology company developing a portfolio of first-in-class trifunctional effector cell response inhibitors (ECRIs) to treat severe allergic diseases. The company was seeded in 2021 by Red Tree Venture Capital and is headquartered in Palo Alto, California. In October 2025, Excellergy publicly launched with $70 million in Series A financing led by Samsara BioCapital, with co-investments from Red Tree Venture Capital and Decheng Capital.

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The company's therapeutic approach is built upon scientific advances from Stanford University and the University of Bern related to the structural binding of Immunoglobulin E (IgE) to its receptor. Excellergy is led by President and CEO Todd Zavodnick, a biotech veteran, alongside Co-founder and Chief Scientific Officer Geoffrey Harris, DVM, PhD, and Chief Medical Officer Philip M. Brown, MD, JD. Other scientific co-founders include Professor Alexander Eggel of the University of Bern, Professor Ted Jardetzky of Stanford University, and Luke Pennington, who is the company's Vice President of Discovery.

Excellergy's ECRIs represent a new therapeutic category designed to provide more complete control of allergic disease compared to existing treatments. The technology employs a trifunctional mechanism that: 1) rapidly removes IgE already bound to effector cells (mast cells and basophils) without triggering cell activation, 2) neutralizes free IgE, and 3) accelerates the downregulation of the IgE receptor FcεRI. This multi-pronged attack on the IgE pathway aims to shut down the allergic response at its source, offering the potential for faster onset and more comprehensive control for a broader patient population. Pre-clinical data has supported this mechanism, with the findings published in the Journal of Allergy and Clinical Immunology. The company's business model is focused on advancing its portfolio of ECRIs through clinical development to address multi-billion-dollar opportunities across a wide range of allergic conditions, such as food allergies, chronic spontaneous urticaria, asthma, and atopic dermatitis. The recent funding is intended to support the advancement of its lead asset into first-in-human clinical studies, which are planned to begin in early 2026.

Source: Dealroom company data

At a glance

Status
Acquired
Founded
2020
Headquarters
Palo Alto, United States
Employees
14
Open positions
None listed
Dealroom signal
91.7/100
Industry
Health
Sub-industry
Pharmaceutical, BioTechnology
Sector
Biotech & Life Sciences, Biotechnology, Drug Development, Allergy, Immune System, Rumoured $1B, Biotech and Pharma, DT and LS
Business model
Manufacturing
Client focus
b2b

Funding history

3 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
ACQUISITIONOther financing Mar 2026 $0 — Novartis ↗
SERIES AOther financing Oct 2025 $70M $280M Decheng Capital · Red Tree Venture Capital · Samsara BioCapital ↗
Showing the latest 2 of 3 recorded eventsBook a demo for the full funding history →

Growth signals

Excellergy website traffic

Latest recorded traffic for Excellergy is 740 monthly website visits, down 76.1% over the last three months. Excellergy's team grew 16.7% over the past year.

Latest monthly visits740 3-month web change-76.1% 1-year team growth+16.7%
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Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

4 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed1 investor entered at this stage

  • Red Tree Venture Capital

Series A2 investors entered at this stage

  • Samsara BioCapital
  • Decheng Capital

Other known investors1 additional known investor

  • Novartis
Team profiled 5 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 4 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
2 countries with
team presence
🇺🇸 United States90.9%
🇨🇭 Switzerland9.1%
2 countries shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Excellergy on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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