On May 7, 2026 Alector, Inc. (Nasdaq: ALEC), a biotechnology company focused on developing therapies to counteract the devasting progression of neurodegeneration, reported first quarter 2026 financial results and recent portfolio and business updates. As of March 31, 2026, Alector’s cash, cash equivalents, and investments totaled $206.5 million.

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"Over the past seven years, we have built a highly differentiated blood-brain barrier platform with the versatility to deliver antibodies, enzymes, proteins, and siRNA to the brain," said Arnon Rosenthal, Ph.D., Chief Executive Officer of Alector. "We have a rich and growing pipeline of ABC-enabled programs, and we remain deeply committed to developing therapies that can make a meaningful difference for patients living with neurodegenerative diseases."

Recent Program Updates

Alector Brain Carrier (ABC): Preclinical and Research Pipeline

At the core of Alector’s strategy is the Alector Brain Carrier (ABC), the company’s proprietary platform designed to enhance the delivery of therapeutics to the brain. ABC is intended for peripheral dosing and is adaptable across multiple drug modalities, including antibodies, enzymes, and siRNA.

The platform is built on core design principles of versatility, optimized binding properties, and translatability, with the goal of achieving efficient and targeted brain delivery while maintaining a favorable safety profile. Across multiple ABC-enabled programs, preclinical studies have demonstrated robust brain penetration, supporting the advancement of a broad pipeline aimed at addressing the underlying drivers of neurodegenerative diseases.

AL037/AL137

Alector continues to advance AL037/AL137, its ABC-enabled anti-amyloid beta (Aβ) antibody program for the treatment of AD, through investigational new drug (IND)-enabling studies. The company is targeting an IND submission in Q1 2027.
Both of our AL037 and AL137 candidates are engineered for optimal brain uptake, potency, safety, and convenience. Both candidates comprise the same high-affinity, fully human antibody that selectively binds PyroGlu3, a validated epitope on toxic amyloid beta found in plaques and retain an active effector function intended to facilitate myeloid-mediated plaque clearance. AL037 and AL137 each incorporates Alector’s proprietary ABC technology with TfR binding domains that bind the same epitope on TfR, but with different affinities and binding kinetics, to balance brain penetration and plaque removal with minimized hematologic adverse effects.
AL050

Alector continues to progress AL050, its ABC-enabled engineered glucocerebrosidase (GCase) enzyme replacement therapy (ERT) for PD, through preclinical development.
AL050 is designed to address key challenges associated with enzyme delivery to the brain, featuring an engineered GCase with improved activity and stability and a silenced effector function to maximize safety, paired with Alector’s tunable ABC technology. Preclinical studies to date have demonstrated increased GCase activity and reduced toxic substrate accumulation, supporting its continued preclinical development as a potential therapy for PD and Lewy body dementia (LBD) associated with GBA loss-of-function mutations and subsequently for idiopathic PD and LBD. We continue to evaluate our timeline to the clinic.
ABC siRNA Platform

Alector is advancing its ABC-enabled siRNA platform with the goal of making treatment more accessible by enabling peripheral dosing as a potential alternative to traditional intrathecal delivery.
Alector continues to advance AL064/AL164, its ABC-enabled tau siRNA program for the treatment of AD and other tauopathies. AL064 demonstrated robust tau mRNA knockdown and durable reduction of phospho-Tau 217 in non-human primate studies, and it was subsequently modified to further optimize siRNA stability. This modified form is advancing into IND-enabling studies as AL164.
In addition to AL164, the company is advancing early-stage siRNA programs toward lead candidate selection, including ADP062-ABC, an alpha-synuclein siRNA for PD and ADP065-ABC, an NLRP3 siRNA for multiple neurodegenerative conditions, reflecting the broad applicability of the ABC platform across disease mechanisms.
Progranulin Program (nivisnebart (AL101/GSK4527226)

The global, randomized, double-blind, placebo-controlled PROGRESS-AD Phase 2 clinical trial of nivisnebart (AL101/GSK4527226) in early AD has been discontinued following a pre-specified interim futility analysis. An independent data monitoring committee concluded that the trial was unlikely to meet its primary endpoint of slowing disease progression at completion. As the company’s platform and pipeline have continued to evolve, Alector remains focused on the significant opportunities ahead across its ABC-enabled programs.
First Quarter 2026 Financial Results

Revenue. Collaboration revenue for the quarter ended March 31, 2026, was $1.0 million, compared to $3.7 million for the same period in 2025. The decrease in year-over-year collaborative revenue was primarily due to lower manufacturing-related activity to support the Nivisnebart Phase 2 study in early Alzheimer’s disease.

R&D Expenses. Total research and development expenses for the quarter ended March 31, 2026, were $17.9 million, compared to $33.6 million for the quarter ended March 31, 2025. The decrease was mainly due to a decrease in personnel-related costs as a result of the reductions in force as well as a decrease in research and development expenses for the AL002 program.

G&A Expenses. Total general and administrative expenses for the quarter ended March 31, 2026, were $8.1 million, compared to $14.7 million for the quarter ended March 31, 2025. The decrease was mainly driven by a decrease in personnel-related costs as a result of the reductions in force.

Net Loss. For the quarter ended March 31, 2026, Alector reported a net loss of $22.9 million, or $0.21 per share, compared to a net loss of $40.5 million, or $0.41 net loss per share, for the same period in 2025.

Cash Position. Cash, cash equivalents, and investments were $206.5 million as of March 31, 2026. Management anticipates that this will be sufficient to fund Alector’s operations at least through 2027.

(Press release, Alector, MAY 7, 2026, View Source [SID1234665298])