Biogen

Open enrollment with an early-phase pipeline tilt

According to ClinicalTrials.gov-derived indexes, Biogen sits in the top decile of US sponsors by registered trial count (#109 of 15,742 sponsors by registered trial count).

334 total trials 21 currently recruiting 237 completed early-phase tilt top decile by trial count

Biogen: 334 sponsored US clinical trials, 21 recruiting.

Biogen sponsors 334 registered US clinical trials on ClinicalTrials.gov, 21 of them currently recruiting, and 237 completed. 84 of these trials are in Phase 3-4 (later-stage) and 198 in Phase 1-2 (earlier-stage). The most-studied condition in this pipeline is Multiple Sclerosis, with 13 trials.

Top-decile sponsor footprint

Biogen ranks in the top decile of sponsors by registered trial count (#109 of 15,742 sponsors by registered trial count). Volume at this scale usually reflects a long institutional pipeline, read phase tilt and therapeutic areas below before treating it as current-year activity.

Trial completion reliability score

F 36/100

237 of 302 decided trials (Completed vs. Terminated on ClinicalTrials.gov) reached their planned completion (78.5%), vs. national p10 68.4% / p90 100% among 1,234 sponsors with at least 10 decided trials. Still-open trials (Recruiting, Active-not-recruiting, Not-yet-recruiting) are excluded since they have not reached an outcome yet.

Open and recent trials

334 total, page 4 of 7

TERMINATED Phase 2

A Study to Assess the Safety and Tolerability of Nusinersen (ISIS 396443) in Participants With Spinal Muscular Atrophy (SMA).

NCT02462759

TERMINATED Phase 3

221AD301 Phase 3 Study of Aducanumab (BIIB037) in Early Alzheimer's Disease

NCT02477800

COMPLETED Phase 3

Effect of BG00012 on Lymphocyte Subsets and Immunoglobulins in Subjects With Relapsing Remitting Multiple Sclerosis (RRMS).

NCT02525874

COMPLETED Phase 1

Single-Ascending Dose Study of BIIB054 in Healthy Participants and Early Parkinson's Disease

NCT02459886

COMPLETED

Tecfidera Lymphocyte Chart Review

NCT02519413

COMPLETED Phase 1

Single-Dose Study of a New Formulation of BIIB061

NCT02521545

COMPLETED Phase 1

Safety, Tolerability and Pharmacokinetics of BIIB118 (PF-05251749)

NCT02443740

COMPLETED Phase 2

A Study of Multiple Doses of Nusinersen (ISIS 396443) Delivered to Infants With Genetically Diagnosed and Presymptomatic Spinal Muscular Atrophy

NCT02386553

COMPLETED Phase 2

RTA 408 Capsules in Patients With Mitochondrial Myopathy - MOTOR

NCT02255422

TERMINATED Phase 3

BG00012 and Delay of Disability Progression in Secondary Progressive Multiple Sclerosis

NCT02430532

TERMINATED Phase 3

Tecfidera Slow-Titration Study

NCT02428231

COMPLETED

A Longitudinal, Observational Biomarker Study in Participants With Primary Sjogren's Syndrome

NCT02422407

COMPLETED Phase 4

Study of Montelukast on Gastrointestinal Tolerability in Patients With Relapsing Forms of Multiple Sclerosis Receiving Tecfidera

NCT02410278

COMPLETED Phase 2

Vaccination Response in Tecfidera-Treated Versus Interferon-Treated Participants With Relapsing Forms of Multiple Sclerosis.

NCT02097849

TERMINATED Phase 4

Study to Evaluate Whether a Medication Event Monitoring System (MEMS) Can Improve Adherence to Tecfidera Treatment in Multiple Sclerosis Patients.

NCT02343159

COMPLETED Phase 1

A Study to Evaluate the Effect of Itraconazole on the Pharmacokinetics of PF-04958242 in Healthy Subjects

NCT02341482

COMPLETED Phase 2

A Study to Learn About the Effects and Safety of RTA 408 (Omaveloxolone) in People Aged 16 to 40 With Friedreich's Ataxia

NCT02255435

COMPLETED Phase 1

Multiple Ascending Doses of PF-04958242 in Subjects With Stable Schizophrenia

NCT02332798

COMPLETED Phase 1

A Randomized, Double-Blind, Placebo-Controlled, Single Ascending Dose Study of Intravenously Administered BMS-986168 in Healthy Subjects

NCT02294851

TERMINATED Phase 4

Impact of Natalizumab Versus Fingolimod in Relapsing-Remitting Multiple Sclerosis (RRMS) Participants

NCT02342704

COMPLETED Phase 3

A Study to Assess the Efficacy and Safety of Nusinersen (ISIS 396443) in Participants With Later-onset Spinal Muscular Atrophy (SMA)

NCT02292537

COMPLETED

Plegridy Observational Program

NCT02230969

COMPLETED

Observational Study to Establish Patient-Matched Population Norms for the Multiple Sclerosis Cognition Assessment Battery

NCT02283918

COMPLETED Phase 1

RTA 408 Capsules in Patients With Melanoma - REVEAL

NCT02259231

COMPLETED Phase 1

Study to Evaluate the Pharmacokinetic Profiles of BIIB017 (Peginterferon Beta-1a) and Rebif® (Interferon Beta-1a) in Healthy Volunteers

NCT02269930

TERMINATED Phase 4

Natalizumab as an Efficacy Switch in Participants With Relapsing Multiple Sclerosis After Failure on Other Therapies

NCT02241785

COMPLETED Phase 1

Study To Evaluate The Safety, Tolerability And Pharmacokinetics Of Single Doses Of PF-04958242 In Healthy Volunteers

NCT02228395

COMPLETED Phase 3

Efficacy and Safety Study of Prolonged-Release Fampridine in Participants With Multiple Sclerosis

NCT02219932

COMPLETED Phase 3

Phase 3 Efficacy and Safety Study of BG00012 in Pediatric Participants With Relapsing-Remitting Multiple Sclerosis (RRMS)

NCT02283853

TERMINATED Phase 3

A Study to Assess the Efficacy and Safety of Nusinersen (ISIS 396443) in Infants With Spinal Muscular Atrophy

NCT02193074

COMPLETED Phase 1

Study to Assess the Safety, Tolerability, and Pharmacokinetics of BIIB061 in Healthy Adult Volunteers

NCT02228707

COMPLETED Phase 1

A Study of ALKS 8700, a Monomethyl Fumarate (MMF) Molecule, in Healthy Adults

NCT02201849

COMPLETED

Real-world Outcomes on Tecfidera (BG00012, Dimethyl Fumarate) Post-Tysabri (BG00002, Natalizumab)

NCT02159573

COMPLETED Phase 2

RTA 408 Lotion in Patients at Risk for Radiation Dermatitis - PRIMROSE

NCT02142959

COMPLETED Phase 1

A Healthy Volunteer Study to Establish the Bioequivalence of BG00012 Supplied by 2 Different Commercial Manufacturers

NCT02171208

COMPLETED Phase 2

RTA 408 Ophthalmic Suspension for the Prevention of Corneal Endothelial Cell Loss Following Cataract Surgery - GUARD

NCT02128113

COMPLETED Phase 2

Bardoxolone Methyl Evaluation in Patients With Pulmonary Hypertension (PH) - LARIAT

NCT02036970

COMPLETED

Pilot Tape Harvesting Study

NCT02125695

COMPLETED Phase 1

Study Evaluating the Safety, Tolerability, and Pharmacokinetics of Single Doses and Multiple Doses of BIIB059 (Litifilimab) in Healthy Volunteers and Participants With Systemic Lupus Erythematosus

NCT02106897

COMPLETED Phase 2

RTA 408 Ophthalmic Suspension for the Treatment of Ocular Inflammation and Pain Following Ocular Surgery

NCT02065375

COMPLETED Phase 1

An Open-label Safety and Tolerability Study of Nusinersen (ISIS 396443) in Participants With Spinal Muscular Atrophy (SMA) Who Previously Participated in ISIS 396443-CS2 (NCT01703988) or ISIS 396443-CS10 (NCT01780246)

NCT02052791

COMPLETED Phase 2

Effect of Natalizumab on Infarct Volume in Acute Ischemic Stroke

NCT01955707

COMPLETED Phase 1

RTA 408 Lotion in Healthy Volunteers

NCT02029716

COMPLETED Phase 1

RTA 408 in the Treatment of Advanced Solid Tumors (NSCLC & Melanoma) - DISCOVER

NCT02029729

COMPLETED Phase 1

Single Ascending Dose Study of the Safety, Tolerability, and Pharmacokinetics of BIIB061 in Healthy Adult Volunteers Including Absolute Bioavailability and Food Effect

NCT02071121

COMPLETED

Dimethyl Fumarate (DMF) Observational Study

NCT02047097

COMPLETED Phase 3

Characterize Flu-like Symptoms in Relapsing Multiple Sclerosis Patients Transitioning From Non-Pegylated Interferon Beta (IFN-β) Therapies to Peginterferon Beta-1a (BIIB017)

NCT01939002

TERMINATED Phase 2

BIIB023 Long-Term Extension Study in Subjects With Lupus Nephritis

NCT01930890

COMPLETED

Biogen Multiple Sclerosis Pregnancy Exposure Registry

NCT01911767

COMPLETED Phase 1

A Study of the Effect of BIIB023 on Muscle Atrophy in Healthy Male Volunteers

NCT01943513

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What is open in the Biogen pipeline

21 recruiting of 334 indexed (6% open); 237 completed (71%).

Phase mix: 84 late (III/IV) vs 198 early (I/II) (early-phase heavy).

Top condition: Multiple Sclerosis (13 trials), 9 others listed.

How open-pipeline share is computed

Recruiting share is recruiting_count divided by trial_count for this sponsor in the public registry export. Status can change between pulls; treat the figure as a research-attention snapshot, not product availability.

Biogen: open-pipeline peers nationwide

Peers matched on 334 registered trials and 6% open enrollment, not the therapeutic-area sidebar.

Biogen sits at or above the median trial volume and at or above the median recruiting share among these 9 nationwide peers -- the two do not always move together. Source: ClinicalTrials.gov (2026-08-08 snapshot). 2×2 strategic matrix plotting 9 entities by Total trials (X) and Recruiting share (Y), with a crosshair dividing the plot into four quadrants. Higher volume & more openFocused & more openHigher volume, mostly closedSmaller & mostly closed 0100200300400 0%5%10%15%20%25% Total trials Recruiting share BiogenNational Institute on Drug Abuse (NIDA)GenentechNational Institutes of Health Clinical Center (CC)Cedars-Sinai Medical CenterAlbert Einstein Healthcare NetworkAltimmuneBassett HealthcareDynavax Technologies Corporation
Biogen sits at or above the median trial volume and at or above the median recruiting share among these 9 nationwide peers -- the two do not always move together. Source: ClinicalTrials.gov (2026-08-08 snapshot).

Biogen sits at or above the median trial volume and at or above the median recruiting share among these 9 nationwide peers -- the two do not always move together.

Sponsors near 334 trials (± recruiting share)

Sponsors near 6% open enrollment (± trial volume)

What to do with this Biogen page

334 registered trials is a research-attention snapshot, not an endorsement of Biogen or any single study.

  • 21 of Biogen's trials are currently recruiting, check each one's own eligibility criteria before contacting a site. Browse recruiting trials
  • Multiple Sclerosis is the condition Biogen studies most, compare against other sponsors active in the same condition before evaluating a specific study. See Multiple Sclerosis trials
  • Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide

Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.

Biogen pipeline card: 334 registered trials from official public datasets.Report a data error.