Best AAV / Gene Therapy CDMOs by Signal Score

← All AAV CDMOs Best Clean FDA History Commercial Scale
Region: USA Europe Asia
10
CDMOs tracked
10
Fully scored
7
With FDA records
26
FDA inspections
90
EMA/MHRA GMP certs

Adeno-associated virus (AAV) is the dominant delivery platform for in vivo gene therapy, from rare-disease programs to larger systemic indications. Rising demand has pushed CDMOs to scale suspension processes and tighten full/empty capsid analytics.

Selecting an AAV CDMO hinges on serotype experience, suspension vs adherent platform, full/empty capsid separation, and a proven regulatory record. The rankings below score each manufacturer on FDA inspections, GMP certification, clinical activity, and capacity.

FDA inspection outcomes across these CDMOs: 15 NAI (no action), 11 VAI (voluntary action), 0 OAI (official action). Leading inspection & GMP sites: UNITED KINGDOM (26), United States (24), Denmark (18), Austria (9), Ireland (9).

Last updated 2026-08-22. Sourced from FDA, EMA EudraGMDP, MHRA GMDP, and ClinicalTrials.gov.

# CDMO Signal Score Quality FDA · GMP Capacity Programs
1
TF
Thermo Fisher Scientific
Plainville, MA · Alachua, FL · Cambridge, MA
 83.1 97.9 6 insp · 10 GMP Available 2 programs
2
AG
AGC Biologics
Longmont, CO · Milan, IT · Copenhagen, DK · Chiba, JP
 80.6 99.9 2 insp · 23 GMP Available 2 programs
3
TK
Takeda
Boston, MA · Zurich, CH
 80.5 99.3 4 insp · 18 GMP — 100 programs
4
Lonza
Basel, Switzerland
 78.2 95.1 2 insp · 8 GMP — 1 programs
5
OX
Oxford Biomedica
Oxford, United Kingdom
 77.1 100.0 0 insp · 13 GMP Available 7 programs
6
CI
Cincinnati Children's Vector Production Facility
Cincinnati, OH
 75.2 100.0 1 insp · 0 GMP — 1 programs
7
RT
ReiThera
Rome, IT
 71.1 100.0 0 insp · 4 GMP — 1 programs
8
CR
Charles River Laboratories
Newbury Park, CA · Memphis, TN · Keele, UK · Rockville, MD
 91.7 98.7 8 insp · 11 GMP Limited 0 programs
9
RP
ReciBioPharm
Keele, UK · Sodertalje, SE
 88.0 100.0 0 insp · 3 GMP — 0 programs
10
PB
Pharmaron Biologics
San Diego, CA · Shaoxing, China, Liverpool, UK, Ningbo China
 86.9 100.0 3 insp · 0 GMP Available 0 programs
How we score CDMOs →

What to evaluate in a AAV / Gene Therapy CDMO

Platform & scale
Suspension processes scale better than adherent (HEK293) for commercial volumes. Confirm the CDMO's largest validated bioreactor scale and serotype track record.
Capsid quality
Full/empty capsid ratio and aggregate control drive potency and safety. Ask about AUC, anion-exchange separation, and the analytics package for capsid characterization.
Regulatory readiness
For programs heading to BLA, a strong FDA inspection history and EMA/MHRA GMP coverage matter — both are shown above and on each profile.
Capacity & timelines
AAV manufacturing slots can be constrained. Weigh the capacity signal and clinical-program load before committing.

AAV / Gene Therapy CDMOs — Frequently Asked Questions

Who are the top AAV / Gene Therapy CDMOs?
By CDMO Signal's independent Signal Score, the top-ranked AAV / Gene Therapy CDMOs include Thermo Fisher Scientific, AGC Biologics, Takeda. See the full ranked table above — scored on FDA, clinical, financial, and capacity data.
How many AAV / Gene Therapy CDMOs have FDA inspection records?
CDMO Signal tracks 7 AAV / Gene Therapy CDMOs with FDA inspection records and 90 EMA/MHRA GMP certificates across the group.
What should I look for in an AAV CDMO?
Look for serotype experience, a scalable suspension platform, strong full/empty capsid analytics, and a clean FDA and EMA/MHRA record. Match validated bioreactor scale to your dose and indication.
What's the difference between AAV and lentiviral CDMOs?
AAV is non-integrating and produced at higher volumes for in vivo gene therapy. Lentivirus integrates into the genome, is made under BSL-2 with RCL testing, and is used mainly for ex vivo cell engineering like CAR-T.
Related modalities
Lentiviral Vector CDMOs Gene Editing CDMOs Plasmid DNA CDMOs
Other Modalities
CAR-T Lentiviral Cell Therapy mRNA/LNP Plasmid DNA Biologics Oligo/ASO Adenoviral Gene Editing Exosome Recombinant Proteins ADC Gene Therapy Cell & Gene Therapy