ML-004 Phase 2 trial misses primary endpoint in Autism Spectrum Disorder (MapLight Therapeutics)

Nasdaq: MPLT+3.37% 24h move
Price before$28.82Jun 18, 2026, 4:00 PM ET
First trade after$24.27Jun 22, 2026, 7:46 AM ET
24h later$29.79Jun 22, 2026, 4:34 PM ET

Complete Announced during: Premarket · announced Mon 7:08a ET (premarket); before = Thu close; first trade Mon 7:46a ET; time = SEC 8-K acceptance

MapLight Therapeutics (Nasdaq: MPLT) reported topline results from a Phase 2 trial of ML-004 in autism spectrum disorder on June 22, 2026. The company said the trial did not meet its primary endpoint. ClinicalTrials.gov lists 168 enrolled participants (NCT05081245).

Trial details

Drug
ML-004Type Drug Route oral
Treats
Studied as a treatment for autism spectrum disorder.Condition Autism Spectrum Disorder
Patients
168 patients (actual enrollment)2 arms · 29 sites in 3 countries
Phase
Phase 2
Design
Randomized, quadruple-blind, placebo-controlled, parallel-group
Primary endpoint
Change from Baseline in Autism Behavior Inventory (ABI)-Social Communication Domain Score (Baseline up to Day 110)
Key secondary endpoints
  • Change from Baseline in Clinician Global Impression of Improvement (CGI-I)
  • Change from Baseline in Autism Behavior Inventory-Clinician (ABI-C) Score
  • Change from Baseline in Aberrant Behavior Checklist 2-Irritability (ABC-I) Subscale Score
Result
Missed endpointThe study did not meet its primary endpoint of change from baseline to Week 12 in the caregiver-reported Autism Behavioral Inventory (ABI)–Social Communication Domain score.
Safety
“An effect size of this magnitude, particularly in those most severely affected, points to a clinically meaningful improvement and warrants further investigation of ML-004 in this population.” Safety and Tolerability ML-004 was generally well-tolerated, with treatment-emergent adverse events…
Sponsor
MapLight Therapeutics Nasdaq: MPLT
Dates
Study start Sep 13, 2022Primary completion Mar 10, 2026Announced Jun 22, 2026, 7:08 AM ET (SEC 8-K filing time)
Trial ID
NCT05081245 ClinicalTrials.gov

About this trial

This randomized, quadruple-blind, placebo-controlled, parallel-group Phase 2 trial (NCT05081245) tested ML-004 in Autism Spectrum Disorder. Studied as a treatment for autism spectrum disorder. It enrolled 168 patients across 2 arms at 29 sites in 3 countries. The primary endpoint was Change from Baseline in Autism Behavior Inventory (ABI)-Social Communication Domain Score (Baseline up to Day 110). MapLight Therapeutics reported that the trial did not meet its primary endpoint. The study started on Sep 13, 2022 and reached primary completion on Mar 10, 2026.

Sources

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