Alexion Pharmaceuticals

Open enrollment with an early-phase pipeline tilt

According to ClinicalTrials.gov-derived indexes, Alexion Pharmaceuticals sits in the top decile of US sponsors by registered trial count (#183 of 15,742 sponsors by registered trial count).

162 total trials 17 currently recruiting 93 completed early-phase tilt top decile by trial count

Alexion Pharmaceuticals: 162 sponsored US clinical trials, 17 recruiting.

Alexion Pharmaceuticals sponsors 162 registered US clinical trials on ClinicalTrials.gov, 17 of them currently recruiting, and 93 completed. 45 of these trials are in Phase 3-4 (later-stage) and 90 in Phase 1-2 (earlier-stage). The most-studied condition in this pipeline is Paroxysmal Nocturnal Hemoglobinuria, with 5 trials.

Top-decile sponsor footprint

Alexion Pharmaceuticals ranks in the top decile of sponsors by registered trial count (#183 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 19/100

93 of 129 decided trials (Completed vs. Terminated on ClinicalTrials.gov) reached their planned completion (72.1%), 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

162 total, page 4 of 4

TERMINATED Phase 2

A Study to Investigate the Safety, Tolerability, Pharmacokinetics, and Antiviral Activity of ACH-0137171 in Participants With Chronic Hepatitis C Infection

NCT00401947

COMPLETED Phase 2

Open-Label, 48-Week Extension Study of Elvucitabine in Combination With Background Antiretroviral Therapy (ART) for Participants Who Have Completed Study ACH443-014A

NCT00380159

COMPLETED Phase 2

Elvucitabine/Efavirenz/Tenofovir Versus Lamivudine/Efavirenz/Tenofovir in Human Immunodeficiency Virus (HIV)-1 Infected, Treatment-naive Participants

NCT00350272

COMPLETED Phase 1

Study of Once Daily Elvucitabine Versus Lamivudine in Participants With a Documented M184V Mutation

NCT00312039

COMPLETED Phase 3

Extension Study of Eculizumab in Patients With Transfusion Dependent Paroxysmal Nocturnal Hemoglobinuria (PNH)

NCT00122317

COMPLETED Phase 3

Study of Safety in Hemolytic Paroxysmal Nocturnal Hemoglobinuria (PNH) Patients Treated With Eculizumab

NCT00122304

COMPLETED

Paroxysmal Nocturnal Hemoglobinuria (PNH) Registry

NCT01374360

COMPLETED Phase 3

Study Using Eculizumab in Transfusion Dependent Paroxysmal Nocturnal Hemoglobinuria (PNH) Patients

NCT00122330

COMPLETED Phase 3

Pexelizumab in Patients Undergoing Coronary Artery Bypass Grafting With Cardiopulmonary Bypass (PRIMO-CABG II)

NCT00088179

TERMINATED Phase 2

Safety and Antiviral Study of ACH126, 433 (b-L-Fd4C) in Adults With Lamivudine-resistant Chronic Hepatitis B

NCT00040144

COMPLETED Phase 3

Effect of Pexelizumab on All-Cause Mortality and Myocardial Infarction in Patients Undergoing Coronary Artery Bypass Graft Surgery With Cardio-Pulmonary Bypass

NCT00048308

TERMINATED Phase 2

Safety and Antiviral Study of ACH-126, 443 (Beta-L-Fd4C) in the Treatment of Adults With HIV Infection and Modestly Detectable Viral Load.

NCT00040157

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What is open in the Alexion Pharmaceuticals pipeline

17 recruiting of 162 indexed (10% open); 93 completed (57%).

Phase mix: 45 late (III/IV) vs 90 early (I/II) (early-phase heavy).

Top condition: Paroxysmal Nocturnal Hemoglobinuria (5 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.

Alexion Pharmaceuticals: open-pipeline peers nationwide

Peers matched on 162 registered trials and 10% open enrollment, not the therapeutic-area sidebar.

Alexion Pharmaceuticals 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 050100150200 4%6%8%10%12%14% Total trials Recruiting share Alexion PharmaceuticalsUniversity of VermontTemple UniversityTufts UniversityWayne State UniversityVertex Pharmaceuticals IncorporatedBastyr UniversityCorewell Health WestEthicon
Alexion Pharmaceuticals 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).

Alexion Pharmaceuticals 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 162 trials (± recruiting share)

Sponsors near 10% open enrollment (± trial volume)

What to do with this Alexion Pharmaceuticals page

162 registered trials is a research-attention snapshot, not an endorsement of Alexion Pharmaceuticals or any single study.

  • 17 of Alexion Pharmaceuticals's trials are currently recruiting, check each one's own eligibility criteria before contacting a site. Browse recruiting trials
  • Paroxysmal Nocturnal Hemoglobinuria is the condition Alexion Pharmaceuticals studies most, compare against other sponsors active in the same condition before evaluating a specific study. See Paroxysmal Nocturnal Hemoglobinuria 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.

Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. Alexion Pharmaceuticals pipeline card: 162 registered trials from official public datasets. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.