10 Medium-Sized CROs in North America
Advanced Clinical
Headquarters: Deerfield, IL, USA
Founded in 1994, Advanced Clinical began as a staffing and resourcing company and evolved into a full-service CRO. It has a strong reputation for supporting mid-sized biopharma clients with clinical operations, biometrics, and regulatory support, and has expanded globally operating in more than 50 countries. Core strengths include full-service clinical trial management (Phases I–IV), FSP, and strategic staffing, with a focus on oncology and rare diseases.
Altasciences
Headquarters: Laval, Quebec, Canada
Altasciences has over 30 years of experience and is unique in combining a CRO with a CDMO (contract development and manufacturing organization). Its integrated model reduces handoffs and accelerates drug development, with expertise in preclinical and early-phase (Phase I/IIa) development, bioanalysis, and CDMO services.
Worldwide Clinical Trials
Headquarters: Research Triangle Park, NC, USA
Established in 1986 by physician-scientist Dr. Neal Cutler, Worldwide has built its brand around a science-first approach. Its reputation is particularly strong among biotech sponsors needing tailored, global support, with deep expertise in CNS, cardiometabolic, oncology, and rare diseases. Named "Most Innovative CRO" and recipient of multiple CRO Leadership Awards.
Premier Research
Headquarters: Morrisville, NC, USA
Founded in 1989, Premier Research has gained prominence for its expertise in complex and underserved patient populations. It delivers trials in over 20 countries and is known for a consultative approach tailored to innovative therapies, with focus on oncology, neurology, rare diseases, pediatrics, and women's health.
Emmes
Headquarters: Rockville, MD, USA
Founded in 1977, Emmes is especially known for its partnerships with the U.S. federal government, including the NIH and CDC. It began as a biostatistics and data coordination company and has expanded into full-service clinical research while retaining its statistical and regulatory strengths. Key player in vaccines, ophthalmology, rare diseases, and infectious disease research.
Allucent
Headquarters: Cary, NC, USA
Rebranded in 2022 from the merger of CATO SMS and Pharm-Olam, Allucent rapidly positioned itself as a CRO focused exclusively on small and mid-sized biotech companies. It aims to be the go-to partner for innovative biotech sponsors seeking hands-on attention, with strengths in oncology, gene therapy, rare diseases, and vaccines.
Caidya
Headquarters: Morrisville, NC, USA (dual HQ with Shanghai, China)
Launched in 2021 through the merger of Clinipace (USA) and dMed (China), Caidya emphasizes global reach with local delivery. It serves both U.S.-based and Asia-based sponsors, with full-service CRO capabilities across oncology, rare diseases, neurology, and women's health in 30+ countries.
Celerion
Headquarters: Lincoln, NE, USA
One of the largest early-phase CROs in North America, with deep roots in clinical pharmacology. Celerion runs some of the most sophisticated Phase I units in the U.S. and Canada, including high-volume clinics with specialized capabilities for adaptive and exploratory studies.
Veristat
Headquarters: Southborough, MA, USA
Founded in 1994, Veristat is known for its statistical, regulatory, and scientific consulting services. It has supported hundreds of INDs, NDAs, and BLAs, especially for rare diseases and advanced therapies. Having supported 50+ marketing applications, it excels at helping first-time sponsors reach approval.
Rho
Headquarters: Durham, NC, USA
A family-founded CRO established in 1984, Rho has grown steadily and built a reputation for integrity and excellence. It has been a key partner on U.S. government clinical research programs, offering a full range of CRO services with a scientific, quality-focused mindset in respiratory, CNS, immunology, and infectious diseases.
Final Thoughts
Choosing the right CRO is as much about culture and alignment as it is about services. These ten organizations provide strong science and operations, while maintaining the agility and partnership spirit many sponsors need.
About BSC®: Since 1986, Biomedical Statistical Consulting® has provided expert biostatistical support for regulatory clinical trials. The firms listed above routinely collaborate with BSC®, with our team able to provide clinical trial design and analysis beyond what their internal CRO staff can provide. Contact BSC® to discuss how our regulatory biostatistics expertise can support your trial.
Congratulations to BSC®’s David Maislin, Alex Breno, and our friends at 3Spine on their recent publication!
The article lays out the protocol for the pivotal IDE trial behind 3Spine's MOTUS® lumbar Total Joint Replacement, the first device built to restore both disc and facet joint function without sacrificing motion.
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