Alector, Inc. (ALEC) Revenue History
Annual and quarterly revenue from 2016 to 2025
Compound Annual Growth Rate (CAGR)
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ALEC Revenue Growth
Revenue Breakdown (FY 2021)
ALEC's revenue distribution by segment and geography for fiscal year 2021
By Product/Segment
ALEC Revenue Analysis (2016–2025)
As of May 8, 2026, Alector, Inc. (ALEC) generated trailing twelve-month (TTM) revenue of $21.0 million, reflecting significant decline in growth of -88.5% year-over-year. The most recent quarter (Q4 2025) recorded $6.2 million in revenue, up 91.3% sequentially.
Looking at the longer-term picture, ALEC's 5-year compound annual growth rate (CAGR) stands at -0.1%, indicating revenue contraction over this period. The company achieved its highest annual revenue of $207.1 million in 2021.
Revenue diversification analysis shows ALEC's business is primarily driven by Phase Three License (100%). With over half of revenue concentrated in Phase Three License, the company maintains significant focus in this area while developing other growth vectors.
When compared to Healthcare sector peers including PRTA (-58.0% YoY), ACAD (+9.9% YoY), and INMB (-100.0% YoY), ALEC has underperformed the peer group in terms of revenue growth. Compare ALEC vs PRTA →
ALEC Revenue vs Peers
Revenue metrics vs comparable public companies
| Company | TTM Revenue | YoY Growth | 5Y CAGR | Op. Margin | Compare |
|---|---|---|---|---|---|
| ALECCurrent | $21M | -88.5% | -0.1% | -741.3% | |
 PRTA | $10M | -58.0% | +62.6% | -1905.8% | |
 ACAD | $1.1B | +9.9% | +19.4% | 9.8% | |
 INMB | $50,000 | -100.0% | +35.4% | -61738.0% |
ALEC Historical Revenue Data (2016–2025)
| Year | Revenue | YoY % | Gross Profit | Gross Margin | Op. Income | Op. Margin |
|---|---|---|---|---|---|---|
| 2025 | $21.0M | -79.1% | $0 | - | $-156,007,000 | -741.3% |
| 2024 | $100.6M | +3.6% | $100.6M | 100.0% | $-144,997,000 | -144.2% |
| 2023 | $97.1M | -27.4% | $88.2M | 90.9% | $-151,740,000 | -156.3% |
| 2022 | $133.6M | -35.5% | $133.6M | 100.0% | $-137,834,000 | -103.2% |
| 2021 | $207.1M | +881.5% | $17.7M | 8.5% | $-37,360,000 | -18.0% |
| 2020 | $21.1M | -0.6% | $-135,771,000 | -643.5% | $-195,174,000 | -925.1% |
| 2019 | $21.2M | -23.3% | $-79,309,000 | -373.8% | $-114,404,000 | -539.2% |
| 2018 | $27.7M | +641.0% | $-45,354,000 | -163.9% | $-57,288,000 | -207.0% |
| 2017 | $3.7M | +797.8% | $-26,176,000 | -700.8% | $-32,679,000 | -874.9% |
| 2016 | $416K | - | $-13,258,000 | -3187.0% | $-15,132,000 | -3637.5% |
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Start ComparisonALEC — Frequently Asked Questions
Quick answers to the most common questions about buying ALEC stock.
Is ALEC's revenue growth accelerating or slowing?
ALEC revenue declined -88.5% year-over-year, contrasting with the 5-year CAGR of -0.1%. TTM revenue fell to $21M. This reverses the prior growth trend.
What is ALEC's long-term revenue growth rate?
Alector, Inc.'s 5-year revenue CAGR of -0.1% reflects the variable expansion pattern. Current YoY growth of -88.5% is below this long-term average.
How is ALEC's revenue distributed by segment?
ALEC reports revenue by product line and geographic region. Annual and quarterly breakdowns from 2016-2025 are available for download. Segment mix reveals concentration and diversification trends.