Quick Answer
Alector, Inc. reported R&D Expense of $123.06 million for fiscal year 2025.
Alector, Inc. R&D Expense — Annual History
| Fiscal Year | R&D Expense | YoY Change |
|---|---|---|
| 2025 | $123.06M | -33.8% |
| 2024 | $185.94M | -3.2% |
| 2023 | $192.12M | -8.7% |
| 2022 | $210.42M | +11.1% |
| 2021 | $189.41M | +20.7% |
| 2020 | $156.87M | +56.0% |
| 2019 | $100.53M | +37.7% |
| 2018 | $73.03M | +144.2% |
| 2017 | $29.91M | — |
Quarterly R&D Expense
| Quarter Ending | R&D Expense | YoY | QoQ |
|---|---|---|---|
| September 30, 2025 | $29.35M | -38.9% | +6.3% |
| June 30, 2025 | $27.61M | -40.4% | -17.9% |
| March 31, 2025 | $33.64M | -25.5% | -29.9% |
| September 30, 2024 | $48.00M | +3.6% | +3.6% |
| June 30, 2024 | $46.31M | +0.3% | +2.5% |
| March 31, 2024 | $45.17M | -13.0% | -2.5% |
| September 30, 2023 | $46.33M | -4.2% | +0.3% |
| June 30, 2023 | $46.18M | -15.3% | -11.0% |
- Alector, Inc. showed a decrease of -33.8% in R&D Expense compared to the prior fiscal year.
- Over the 2017–2025 period, Alector, Inc.’s r&d expense has grown by 311.4% (from $29.91 million to $123.06 million).
- The most recent figure is from Alector, Inc.’s fiscal year 2025 report (Form 10-K), filed with the SEC on February 25, 2026.
- All figures are sourced from SEC EDGAR XBRL filings, last verified June 17, 2026.
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