When was Upstream Bio founded?

Upstream Bio was founded in 2021 and raised its 1st funding round 1 year after it was founded.

Where is Upstream Bio located?

Upstream Bio is headquartered in Waltham, United States.

How many employees does Upstream Bio have?

As of Sep 30, 2026, the latest employee count at Upstream Bio is 86.

Is Upstream Bio a funded company?

Upstream Bio is a funded company, having raised a total of $400M across 2 funding rounds to date. The company's 1st funding round was a $***** Series A round, raised on Jun 02, 2022.

When was the latest funding round of Upstream Bio?

Upstream Bio's latest funding was a $***** Series B round on Jun 08, 2023, with participation from 12 investors.

What is the annual revenue of Upstream Bio?

Annual revenue of Upstream Bio is between $1M and $10M as on Dec 31, 2025

Where does Upstream Bio rank among its competitors?

Upstream Bio ranks 1st amongst 313 active competitors, of which 113 are funded. It stands 2nd in terms of total funding among its competitors. The most recent competitor to raise funding was Trimtech Therapeutics, which secured $14M in Jun, 2026.

Who are the top competitors of Upstream Bio?

Upstream Bio's top competitors include Odyssey, Septerna and Ventyx Biosciences. Among them, Trimtech Therapeutics secured the most recent funding round in June, 2026.

Upstream Bio - 2026 Company Profile, Team, Funding, Competitors & Financials

Company Details

Developer of therapeutics for allergic and inflammatory diseases. The lead candidate for the company UPB-101 is a monoclonal antibody that inhibits the TSLP receptor that affects a variety of immune cells pivotal to many inflammatory diseases.

Website: upstreambio.com
Social
Email ID: *****@upstreambio.com

Key Metrics

Founded Year

2021

Location

Waltham, United States

Stage

Public

Total Funding

$400M in 2 rounds

Latest Funding Round

Series B, Jun 08, 2023, $*****

Investors

Orbimed & 12 more

Ranked

1^st among 313 active competitors

Annual Revenue

$1M - $10M as on Dec 31, 2025

Employee Count

86 as on Sep 30, 2026

Similar Companies

Odyssey & 375 more

Exit Details

Public

View Upstream Bio's full profile

Upstream Bio is associated with 1 legal entity given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Reports
Upstream Bio, Inc. CIN: 2022626 , United States, Active		$1M - $10M (As on Dec 31, 2025)	-	-

Upstream Bio got listed on Oct 11, 2024.

Click here to take a look at Upstream Bio's IPO in detail

Upstream Bio has raised a total funding of $400M over 2 rounds. Its first funding round was on Jun 02, 2022. Its latest funding round was a Series B round on Jun 08, 2023 for $*****. 12 investors participated in its latest round. Upstream Bio has 13 institutional investors.

Here is the list of recent funding rounds of Upstream Bio:

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Jun 08, 2023	1460945	Series B	7926011	8155361	4790547	6915971
Jun 02, 2022	7499494	Series A	3800231	6882621	Maruho & 1 more	Decheng Capital & 6 more

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View details of Upstream Bio's funding rounds and investors

The founders of Upstream Bio are Eran Perry and Oren Becker.

Here are the details of Upstream Bio's key team members:

Eran Perry: Former Co-Founder of Upstream Bio and founder of 2 other companies, Mii and ICD Pharma.
Contact Info: 1 email address
Oren Becker: Founder of Upstream Bio and founder of 1 other company.

View details of Upstream Bio's Founder profiles and Board Members

Upstream Bio's employee count trend

Upstream Bio has 86 employees as of Sep 26. Here is Upstream Bio's employee count trend over the years:

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Top competitors of Upstream Bio include Odyssey, Septerna and Ventyx Biosciences. Here is the list of Top 10 competitors of Upstream Bio, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	Upstream Bio 2021, Waltham (United States), Public	Developer of therapeutics for allergic and inflammatory diseases	$400M	Access Industries, Bain Capital Life Sciences ... & 11 others	67/100
2nd	Odyssey 2018, Cambridge (United States), Public	Developer of immunotherapeutics for immunological and cancer diseases	$717M	Orbimed, Ascenta Capital & 29 others	66/100
3rd	Septerna 2020, San Bruno (United States), Public	Developer of GPCR drug discovery platform for multiple diseases	$250M	RA Capital Management, Third Rock Ventures ... & 14 others	66/100
4th	Ventyx Biosciences 2018, Encinitas (United States), Acquired	Developer of therapeutics to treat autoimmune diseases	$165M	VenBio, Logos Capital & 13 others	66/100
5th	Evommune 2020, Sacramento (United States), Public	Developer of therapeutic options for chronic inflammatory disorders	$276M	Pivotal bioVenture Partners, RA Capital Management ... & 18 others	66/100
6th	CalciMedica 2006, San Diego (United States), Public	Developer of CRAC channel inhibitor drugs for inflammatory diseases	$76.7M	Biogen, Valence Life Sciences & 11 others	64/100
7th	Apollo Therapeutics 2020, Cambridge (United Kingdom), Series C	Developer of therapeutic programs based on biological and medical research	$372M	Patient Square Capital, Rock Springs Capital ... & 3 others	61/100
8th	Trimtech Therapeutics 2023, Cambridge (United Kingdom), Seed	They develop treatments for CNS and inflammatory disorders	$47M	Cambridge Innovation Capital, SV Health Investors ... & 11 others	61/100
9th	Equillium 2017, San Diego (United States), Public	Developer of therapies for treating autoimmune and inflammatory disorders	-	ADAR1 Capital Management, Janus Henderson Investors ... & 6 others	60/100
10th	Philogen 1996, Sovicille (Italy), Public	Developer of antibody based drugs for angiogenesis-related cancer and inflammatory disorders	$69.7M	The Equity Club, Novacapital & 3 others	59/100