10 Regulatory & Medical Writing Vendors in 2026

A clinical trial generates data; a medical writing provider turns that data into the documents regulators, investigators, and reviewers actually read — protocols, clinical study reports, investigator brochures, and submission dossiers. The job isn't just prose. It's presenting complex data so a reviewer can find what they need quickly, in a format and structure that regulatory agencies expect.

The companies on this list offer medical writing services for clinical trials, from dedicated regulatory writing consultancies to CROs that pair writing with data management and biostatistics. This is an unranked list — the order carries no judgment about quality or fit. Several also handle related regulatory writing work — safety narratives, periodic reports, and submission-ready formatting — alongside their core medical writing output.

Trilogy Writing & Consulting

Trilogy positions medical writing as its sole focus, specializing in regulatory documentation such as clinical study protocols, clinical study reports, submission dossiers, and safety documents like DSURs and PSURs. The company's writers work as embedded members of client teams rather than outside contractors, aiming for documents clear enough that reviewers need minimal clarifying questions, which the company positions as a way to speed approval. Founded in 2002 and headquartered in Frankfurt, Germany, with additional US operations, Trilogy was acquired by Indegene in March 2024 to expand Indegene's clinical and regulatory writing capabilities.

Morula Health

Morula Health names regulatory and clinical medical writing as its priority, covering IND/NDA/BLA submissions, clinical study reports, investigator's brochures, and nonclinical and safety documents like DSURs and PSURs. The company assigns writers based on therapeutic area and document-type experience across biologics, cell and gene therapy, small molecules, vaccines, and medical devices, and offers functional service provider (FSP) engagement alongside project-based work. Morula Health is based at the London Bioscience Innovation Centre in London, England.

Acumen Medical Communications

Acumen Medical Communications built its Acumen Smart Document Solution, a suite of templates and tools designed to pair medical writer expertise with technology, aiming to speed timelines and navigate an increasingly complex regulatory landscape. The company was founded by sponsor-side veterans, including a former Director of Medical Writing and a former Senior Medical Director, and now employs more than 60 full-time and contract medical writers, editors, and clinical scientists supporting over 100 active clients. Founded in 2016 and based in Brookline, Massachusetts, Acumen develops eCTD templates and Word add-ins to streamline regulatory document submission for both US and EU filings.

ICRC-Weyer

ICRC-Weyer built its service portfolio around three core disciplines — biostatistics, clinical data management, and medical writing — supported by specialist services including medical review and pharmacovigilance and safety writing. The company delivers all of its services from its Berlin offices for clinical trial projects run globally or locally, working with both sponsors and partner CROs. Founded in 1993, ICRC-Weyer is based in Berlin, Germany.

Metronomia Clinical Research

Metronomia concentrates on biostatistical consulting, biostatistical services, clinical data management, and medical writing, and states it has contributed to more than 720 clinical projects across major therapeutic areas. The company employs more than 150 specialists working on customer projects spanning every clinical trial phase, and describes itself as financially independent with a focus on sustainable growth. Founded in 1990 by Dieter Meyer and Rudolf Köhne-Volland, Metronomia is based in Munich, Germany.

Innovative Analytics

Innovative Analytics pairs data management and statistical services with medical writing that spans protocol design through final study report writing, positioning the three disciplines as a connected offering rather than separate service lines. The company's Director of Medical Writing previously held the role of Executive Director of Medical Writing at Pharmacia/Pfizer, and its statistics team includes several staff with doctorate degrees. Founded in 2003 by senior-level directors from Pharmacia/Pfizer, Innovative Analytics is based in Kalamazoo, Michigan.

DataClin

DataClin was established as the first CRO in the MENA region specializing specifically in clinical data management, biostatistics, and medical writing, and has grown into one of the region's leading CROs in that niche. The company operates according to a full set of internal standards that it updates on an ongoing basis to track regulatory requirements and international guidelines. Founded in 2010, DataClin is based in Dokki, Giza, Egypt.

Celivis

Celivis pairs medical writing with pharmacovigilance, describing its work as spanning structured content development, safety monitoring, and scalable operational support for compliant outcomes. The company positions its offering as end-to-end support across these two core capabilities rather than a broader full-service CRO model. Founded in 2016, Celivis is based in London, England.

Genpro Research

Genpro Research combines biostatistics, statistical programming, medical writing, and data science solutions, positioning itself as a technology-enabled partner for accelerating clinical development. The company works with pharmaceutical, biotechnology, and medical device clients, applying its data science capabilities alongside traditional biometrics and writing services. Founded in 2016, Genpro Research is based in Waltham, Massachusetts.

Zeta Research

Zeta Research provides clinical research, medical writing, and data analysis services to pharmaceutical, biotechnology, and medical device companies pursuing research and development activities. The company keeps its service scope to these three connected disciplines rather than offering the full range of CRO functions. Founded in 2002, Zeta Research is based in Trieste, Italy.

Explore the full medical writing landscape

The companies above represent a portion of a much larger field.

Diligent's platform includes over 475 Medical Writing Vendors, many with Vendor qualification data available on demand. Book a demo to explore Diligent's full vendor discovery database.

This article is intended as an informational overview of vendors operating in this space. Inclusion on this list does not constitute an endorsement, recommendation, or qualification by Diligent.