Startup · United States

Parallel Bio

HQ CambridgeFounded 202111-50 employeesUpdated Oct 18, 2026

Parallel Bio is a biotechnology company based in Cambridge, Massachusetts, pioneering a new approach to drug discovery by using human immune organoids and artificial intelligence.

Series A · Jun 11, 2025

Key facts

Type: Startup
HQ: Cambridge
Founded: 2021
Employees: 11-50
As of: Oct 18, 2026
Sources: 5

About

Parallel Bio is a biotechnology company based in Cambridge, Massachusetts, pioneering a new approach to drug discovery by using human immune organoids and artificial intelligence. Their platform replicates the human immune system "in a dish," enabling the development and testing of immunotherapies and drugs directly on human models rather than relying on animal testing. This method addresses the inefficiencies and ethical concerns of traditional pharmaceutical development, where animal models often fail to predict human outcomes, leading to high costs, long timelines, and a high failure rate for new drugs. By leveraging organoids and AI, Parallel Bio can rapidly generate novel immune data, drive AI-powered drug discovery, and verify drug candidates in vitro, significantly reducing risk and accelerating the path to market for new therapies.

Funding3 rounds · $25.6M

Equity raised: $25.6M
Latest: $21.0MSeries A · Jun 11, 2025

Cumulative raised$25.6M

Aug 30, 2021Jun 11, 2025

Funding rounds
Announced	Stage	Amount	Valuation	Lead investors	Other investors	Confidence
Jun 11, 2025	Series A	$21.0M	—	—	—	Reported
Dec 20, 2022	Seed	$4.3M	—	—	—	Reported
Aug 30, 2021	Pre-Seed	$325K	—	—	—	Reported

Series A
$21.0M
Jun 11, 2025
Seed
$4.3M
Dec 20, 2022
Pre-Seed
$325K
Aug 30, 2021

Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.

People2

All 2 people →

People
Person	Role
Juliana Hilliard	Co-Founder & CSO
Robert DiFazio	co-founder and CEO

Hiring Observations1 observed listings

Director, Platform Enterprise Account Executive ↗
Remote | Midwest or East Coast · Full-time · Commercial
Checked Oct 5, 2026

Hiring observations
Role	Location	Type	Category	Checked
Director, Platform Enterprise Account Executive ↗	Remote \| Midwest or East Coast	Full-time	Commercial	Oct 5, 2026

A sample of observed listings, not a total vacancy count. Availability may have changed since collection. Categories are inferred from job titles.

Sources5

Profile2

1
OtherParallel Bio - Black Flag Job Board
Black Flag · Supports Organization
“Pioneers drug discovery by using human immune organoids and artificial intelligence to develop and test therapies directly on human models, replacing animal”
2
OtherParallel Bio - Y Combinator
Y Combinator · Supports Organization · founded year
“e cost and risk of clinical trials. Based in San Francisco, the company was founded in 2021 by two of the world’s leading experts in replacing animal models with human-first platforms.”

Funding1

3
DatabaseParallel Bio - LinkedIn company profile
LinkedIn · Supports Funding round, Organization · employee range, Role
“funding round: Seed Round, 2022-12-20, USD 4,300,000, lead: Refactor”

People1

4
NewsParallel Bio Secures $4.3 Million Seed Round to Accelerate Drug Discovery through Human Immune System in a Dish
biospace.com · Supports Role
““Nearly 95 percent of drugs that make it to clinical trials fail, even when they work on animals first,” said Robert DiFazio, co-founder and CEO of Parallel Bio.”

Other1

5
OtherDirector, Platform Enterprise Account Executive - Parallel Bio - Black Flag Job Board
Black Flag · Supports Job posting
“Director, Platform Enterprise Account Executive”

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