CDMO Signal · Best CDMOs · CDMOs with the Cleanest FDA Inspection Records

CDMOs with the Cleanest FDA Inspection Records

The CDMOs that combine substantial FDA inspection experience with no unresolved compliance signals — the diligence subset for late-stage and commercial supply.

The CDMOs with the strongest FDA inspection track records combine three signals: (1) substantial inspection density — at least 3 FDA inspections on record, demonstrating actual regulator scrutiny rather than obscurity; (2) no Warning Letters — a Warning Letter is a hard signal of unresolved compliance issues and typically disqualifies a CDMO from commercial supply until formally resolved; (3) no OAI classifications — Official Action Indicated is the most serious inspection outcome. The ranking below applies all three filters to the scored CDMO population.

Filter applied: This ranking includes only CDMOs meeting all three criteria: at least 3 FDA inspections on record (demonstrating regulator scrutiny), zero FDA Warning Letters, and zero OAI (Official Action Indicated) inspection classifications. CDMOs are then ranked by composite Signal Score. Data sources: FDA Data Dashboard (inspections + 483 observations + Warning Letters). See methodology for the full scoring pillar detail.

FDA inspection posture is the single most important regulatory signal in CDMO shortlisting for programs supplying US markets. Sponsors filing under FDA jurisdiction bear direct consequences for their manufacturer's inspection record — an OAI outcome at a supplier site can halt commercial supply, trigger recall, or block product approval.

Inspection density matters as much as inspection outcome. A CDMO with 12 clean inspections on record has demonstrated compliance under sustained scrutiny; a CDMO with zero inspections has demonstrated nothing — no Warning Letters is not the same as an inspection-tested record. The filter below requires both: substantial inspection experience AND clean outcomes across all of it.

For commercial supply specifically, sponsors should also verify facility-level detail on the individual CDMO profile pages — a CDMO's aggregate record may combine sites with different histories, and the site running your program is the one that matters. This ranking is the shortlist filter; site-level diligence closes the choice.

21 qualified of 166 scored CDMOs

· Updated 2026-08-31

#	CDMO	Score	FDA inspections
1	Charles River Laboratories Newbury Park, CA · Memphis, TN · Keele, UK · Rockville, MD	91.7	8
2	Pfizer CentreOne Kalamazoo, MI · McPherson, KS	91.5	4
3	Bristol Myers Squibb (CGT Mfg) Bothell, WA · Warren, NJ	90.8	6
4	Novartis Basel, Switzerland	88.3	16
5	Pharmaron Biologics San Diego, CA · Shaoxing, China, Liverpool, UK, Ningbo China	86.9	3
6	City of Hope (T Cell Manufacturing) Duarte, CA	83.8	3
7	Piramal Pharma Solutions Lexington, KY · Riverview, MI · Ahmedabad, IN	83.6	5
8	Bachem Bubendorf, CH	83.5	3
9	Thermo Fisher Scientific Plainville, MA · Alachua, FL · Cambridge, MA	83.1	6
10	Corden Pharma Plankstadt, DE · Caponago, IT · Boulder, CO	82.5	4
11	Eurofins CDMO Planegg, DE · San Diego, CA	81.6	5
12	BioReliance (Merck) Glasgow, UK · Rockville, MD	81.0	4
13	Takeda Boston, MA · Zurich, CH	80.5	4
14	Bayer (Cell Therapy Mfg) Berkeley, CA	79.2	8
15	CCRM Toronto, ON, Canada	78.1	5
16	Biocon Biologics Bangalore, India	77.1	4
17	Catalent Bagsværd, Denmark (operating under Novo Holdings; legacy US operations Somerset, NJ)	76.5	12
18	Genezen Indianapolis, IN · Lexington, MA	70.7	3
19	BSP Pharmaceuticals Latina, Italy	67.6	7
20	Grand River Aseptic Manufacturing Grand Rapids, MI	66.4	3
21	PolyPeptide Group Torrance, CA · Strasbourg, FR · Malmo, SE	64.8	3