Best AAV / Gene Therapy CDMOs by Signal Score

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CDMOs tracked

Fully scored

With FDA records

FDA inspections

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: 10 NAI (no action), 7 VAI (voluntary action), 0 OAI (official action). Leading inspection & GMP sites: UNITED KINGDOM (19), United States (17), Denmark (12), Ireland (6), France (4).

Last updated 2026-06-24. Sourced from FDA, EMA EudraGMDP, MHRA GMDP, and ClinicalTrials.gov.

#	CDMO	Signal Score	Quality	FDA · GMP	Capacity	Programs
1	CR Charles River Laboratories Newbury Park, CA · Memphis, TN · Keele, UK · Rockville, MD	91.7	98.7	7 insp · 11 GMP	Limited	0 programs
2	RP ReciBioPharm Keele, UK · Sodertalje, SE	88.0	100.0	0 insp · 3 GMP	—	0 programs
3	PB Pharmaron Biologics San Diego, CA · Shaoxing, CN	85.6	100.0	3 insp · 0 GMP	—	0 programs
4	AJ Ajinomoto Bio-Pharma Services San Diego, CA · Osaka, JP	85.6	100.0	0 insp · 1 GMP	—	0 programs
5	LB Lotte Biologics Incheon, KR · Syracuse, NY	83.7	100.0	1 insp · 0 GMP	—	0 programs
6	WB2 WuXi Biologics Shanghai, CN · Wuxi, CN	83.7	100.0	0 insp · 4 GMP	—	0 programs
7	KB KBI Biopharma Durham, NC · Boulder, CO	83.5	100.0	1 insp · 1 GMP	Limited	0 programs
8	FD FUJIFILM Diosynth Biotechnologies Research Triangle, NC · Holly Springs, NC · Hillerod, DK	83.5	100.0	0 insp · 18 GMP	Expanding	0 programs
9	TF Thermo Fisher Scientific Plainville, MA · Alachua, FL · Cambridge, MA	83.1	97.9	5 insp · 10 GMP	Available	2 programs
10	DH Danaher (CGT Portfolio) Washington, DC	81.5	—	—	—	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 Charles River Laboratories, ReciBioPharm, Pharmaron Biologics. 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 5 AAV / Gene Therapy CDMOs with FDA inspection records and 48 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