Research and Development Expense of Alector, Inc. from 31 Dec 2017 to 31 Dec 2025

Taxonomy & unit
us-gaap: USD
Description
The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.
Summary
Alector, Inc. quarterly and annual Research and Development Expense in USD history and change rate from 31 Dec 2017 to 31 Dec 2025.
  • Alector, Inc. Research and Development Expense for the quarter ending 31 Dec 2025 was $32,463,000, a 30% decline year-over-year.
  • Alector, Inc. Research and Development Expense for the twelve months ending 31 Dec 2025 was $123,065,000, a 34% decline year-over-year.
  • Alector, Inc. annual Research and Development Expense for 2025 was $123,065,000, a 34% decline from 2024.
  • Alector, Inc. annual Research and Development Expense for 2024 was $185,940,000, a 3.2% decline from 2023.
  • Alector, Inc. annual Research and Development Expense for 2023 was $192,115,000, a 8.7% decline from 2022.
Source SEC data
View on sec.gov
Research and Development Expense, Trailing 12 Months (USD)
Research and Development Expense, Quarterly (USD)
Research and Development Expense, YoY Quarterly Change (%)
Research and Development Expense, Annual (USD)
Research and Development Expense, YoY Annual Change (%)

Alector, Inc. Quarterly Research and Development Expense (USD)

Period TTM Value Value YoY Chg Change % Start Date End Date Report Filed Fiscal Year Fiscal Period
Q4 2025 $123,065,000 $32,463,000 -$13,998,000 -30% 01 Oct 2025 31 Dec 2025 10-K 25 Feb 2026 2025 FY
Q3 2025 $137,063,000 $29,350,000 -$18,648,000 -39% 01 Jul 2025 30 Sep 2025 10-Q 06 Nov 2025 2025 Q3
Q2 2025 $155,711,000 $27,611,000 -$18,703,000 -40% 01 Apr 2025 30 Jun 2025 10-Q 07 Aug 2025 2025 Q2
Q1 2025 $174,414,000 $33,641,000 -$11,526,000 -26% 01 Jan 2025 31 Mar 2025 10-Q 08 May 2025 2025 Q1
Q4 2024 $185,940,000 $46,461,000 -$1,262,000 -2.6% 01 Oct 2024 31 Dec 2024 10-K 25 Feb 2026 2025 FY
Q3 2024 $187,202,000 $47,998,000 +$1,670,000 +3.6% 01 Jul 2024 30 Sep 2024 10-Q 06 Nov 2025 2025 Q3
Q2 2024 $185,532,000 $46,314,000 +$137,000 +0.3% 01 Apr 2024 30 Jun 2024 10-Q 07 Aug 2025 2025 Q2
Q1 2024 $185,395,000 $45,167,000 -$6,720,000 -13% 01 Jan 2024 31 Mar 2024 10-Q 08 May 2025 2025 Q1
Q4 2023 $192,115,000 $47,723,000 -$6,770,000 -12% 01 Oct 2023 31 Dec 2023 10-K 26 Feb 2025 2024 FY
Q3 2023 $198,885,000 $46,328,000 -$2,020,000 -4.2% 01 Jul 2023 30 Sep 2023 10-Q 06 Nov 2024 2024 Q3
Q2 2023 $200,905,000 $46,177,000 -$8,357,000 -15% 01 Apr 2023 30 Jun 2023 10-Q 07 Aug 2024 2024 Q2
Q1 2023 $209,262,000 $51,887,000 -$1,156,000 -2.2% 01 Jan 2023 31 Mar 2023 10-Q 08 May 2024 2024 Q1
Q4 2022 $210,418,000 $54,493,000 +$1,703,000 +3.2% 01 Oct 2022 31 Dec 2022 10-K 26 Feb 2025 2024 FY
Q3 2022 $208,715,000 $48,348,000 +$5,282,000 +12% 01 Jul 2022 30 Sep 2022 10-Q 07 Nov 2023 2023 Q3
Q2 2022 $203,433,000 $54,534,000 +$6,716,000 +14% 01 Apr 2022 30 Jun 2022 10-Q 03 Aug 2023 2023 Q2
Q1 2022 $196,717,000 $53,043,000 +$7,310,000 +16% 01 Jan 2022 31 Mar 2022 10-Q 04 May 2023 2023 Q1
Q4 2021 $189,407,000 $52,790,000 +$8,407,000 +19% 01 Oct 2021 31 Dec 2021 10-K 27 Feb 2024 2023 FY
Q3 2021 $181,000,000 $43,066,000 -$753,000 -1.7% 01 Jul 2021 30 Sep 2021 10-Q 08 Nov 2022 2022 Q3
Q2 2021 $181,753,000 $47,818,000 +$13,756,000 +40% 01 Apr 2021 30 Jun 2021 10-Q 04 Aug 2022 2022 Q2
Q1 2021 $167,997,000 $45,733,000 +$11,128,000 +32% 01 Jan 2021 31 Mar 2021 10-Q 05 May 2022 2022 Q1
Q4 2020 $156,869,000 $44,383,000 +$18,621,000 +72% 01 Oct 2020 31 Dec 2020 10-K 28 Feb 2023 2022 FY
Q3 2020 $138,248,000 $43,819,000 +$15,300,000 +54% 01 Jul 2020 30 Sep 2020 10-Q 04 Nov 2021 2021 Q3
Q2 2020 $122,948,000 $34,062,000 +$8,422,000 +33% 01 Apr 2020 30 Jun 2020 10-Q 03 Aug 2021 2021 Q2
Q1 2020 $114,526,000 $34,605,000 +$13,998,000 +68% 01 Jan 2020 31 Mar 2020 10-Q 05 May 2021 2021 Q1
Q4 2019 $100,528,000 $25,762,000 +$1,665,000 +6.9% 01 Oct 2019 31 Dec 2019 10-K 24 Feb 2022 2021 FY
Q3 2019 $98,863,000 $28,519,000 +$8,127,000 +40% 01 Jul 2019 30 Sep 2019 10-Q 10 Nov 2020 2020 Q3
Q2 2019 $90,736,000 $25,640,000 +$8,822,000 +52% 01 Apr 2019 30 Jun 2019 10-Q 11 Aug 2020 2020 Q2
Q1 2019 $81,914,000 $20,607,000 +$8,883,000 +76% 01 Jan 2019 31 Mar 2019 10-Q 13 May 2020 2020 Q1
Q4 2018 $73,031,000 $24,097,000 01 Oct 2018 31 Dec 2018 10-K 25 Feb 2021 2020 FY
Q3 2018 $20,392,000 01 Jul 2018 30 Sep 2018 10-Q 12 Nov 2019 2019 Q3
Q2 2018 $16,818,000 01 Apr 2018 30 Jun 2018 10-Q 12 Aug 2019 2019 Q2
Q1 2018 $11,724,000 01 Jan 2018 31 Mar 2018 10-Q 13 May 2019 2019 Q1

Alector, Inc. Annual Research and Development Expense (USD)

Period Value YoY Chg Change % Start Date End Date Report Filed Fiscal Year Fiscal Period
2025 $123,065,000 -$62,875,000 -34% 01 Jan 2025 31 Dec 2025 10-K 25 Feb 2026 2025 FY
2024 $185,940,000 -$6,175,000 -3.2% 01 Jan 2024 31 Dec 2024 10-K 25 Feb 2026 2025 FY
2023 $192,115,000 -$18,303,000 -8.7% 01 Jan 2023 31 Dec 2023 10-K 26 Feb 2025 2024 FY
2022 $210,418,000 +$21,011,000 +11% 01 Jan 2022 31 Dec 2022 10-K 26 Feb 2025 2024 FY
2021 $189,407,000 +$32,538,000 +21% 01 Jan 2021 31 Dec 2021 10-K 27 Feb 2024 2023 FY
2020 $156,869,000 +$56,341,000 +56% 01 Jan 2020 31 Dec 2020 10-K 28 Feb 2023 2022 FY
2019 $100,528,000 +$27,497,000 +38% 01 Jan 2019 31 Dec 2019 10-K 24 Feb 2022 2021 FY
2018 $73,031,000 +$43,120,000 +144% 01 Jan 2018 31 Dec 2018 10-K 25 Feb 2021 2020 FY
2017 $29,911,000 01 Jan 2017 31 Dec 2017 10-K 24 Mar 2020 2019 FY
* An asterisk sign (*) next to the value indicates that the value is likely invalid.