Alector, Inc.
US ˙ NasdaqGS ˙ US0144421072

SecurityALEC / Alector, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership4,639 shares
Latest Disclosed Value $ 9,974
Citigroup Inc reports 24.63% decrease in ownership of ALEC / Alector, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 4,639 shares of Alector, Inc. (US:ALEC) valued at $9,974 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 6,155 shares of Alector, Inc.. This represents a change in shares of -24.63% during the quarter. The current value of the position is $8,397 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F ALECTOR COM 014442107 4,639 -1,516 -24.63 10 0.00 0.0000
2026-02-13 2025-12-31 13F ALECTOR COM 014442107 6,155 -47,783 -88.59 10 -94.34 0.0000
2025-11-10 2025-09-30 13F ALECTOR COM 014442107 53,938 4,477 9.05 160 130.43 0.0001
2025-08-11 2025-06-30 13F ALECTOR COM 014442107 49,461 -13,295 -21.19 69 -10.39 0.0000
2025-05-12 2025-03-31 13F ALECTOR COM 014442107 62,756 -7,017 -10.06 77 -41.22 0.0000
2025-02-12 2024-12-31 13F ALECTOR COM 014442107 69,773 9,698 16.14 132 -53.05 0.0001
2024-11-12 2024-09-30 13F ALECTOR COM 014442107 60,075 27,548 84.69 280 89.80 0.0002
2024-08-12 2024-06-30 13F ALECTOR COM 014442107 32,527 -208,449 -86.50 148 -89.86 0.0001
2024-05-10 2024-03-31 13F ALECTOR COM 014442107 240,976 158,432 191.94 1,451 120.36 0.0010
2024-02-09 2023-12-31 13F ALECTOR COM 014442107 82,544 3,021 3.80 659 27.77 0.0005
2023-12-06 2023-09-30 13F/A-1 ALECTOR COM 014442107 79,523 -388 -0.49 515 7.29 0.0004
2023-11-09 2023-09-30 13F ALECTOR COM 014442107 79,523 -388 515 0.0002
2023-08-10 2023-06-30 13F ALECTOR COM 014442107 79,911 -128,265 -61.61 480 -62.73 0.0003
2023-05-11 2023-03-31 13F ALECTOR COM 014442107 208,176 108,000 107.81 1,289 39.39 0.0009
2023-02-09 2022-12-31 13F ALECTOR COM 014442107 100,176 -79,260 -44.17 925 -45.55 0.0007
2022-11-10 2022-09-30 13F ALECTOR COM 014442107 179,436 24,663 15.93 1,697 7.95 0.0012
2022-08-10 2022-06-30 13F ALECTOR COM 014442107 154,773 109,786 244.04 1,572 145.24 0.0012
2022-05-12 2022-03-31 13F ALECTOR COM 014442107 44,987 -113,232 -71.57 641 -80.38 0.0004
2022-02-10 2021-12-31 13F ALECTOR COM 014442107 158,219 61,712 63.95 3,267 48.37 0.0017
2021-11-10 2021-09-30 13F ALECTOR COM 014442107 96,507 -54,737 -36.19 2,202 -30.10 0.0013
2021-08-10 2021-06-30 13F ALECTOR COM 014442107 151,244 -5,397 -3.45 3,150 -0.16 0.0019
2021-05-13 2021-03-31 13F ALECTOR COM 014442107 156,641 143,794 1,119.28 3,155 1,526.29 0.0020
2021-02-11 2020-12-31 13F ALECTOR COM 014442107 12,847 7,306 131.85 194 234.48 0.0001
2020-11-12 2020-09-30 13F ALECTOR COM 014442107 5,541 -180,954 -97.03 58 -98.73 0.0000
2020-08-12 2020-06-30 13F ALECTOR COM 014442107 186,495 160,209 609.48 4,558 618.93 0.0036
2020-05-12 2020-03-31 13F ALECTOR COM 014442107 26,286 -946 -3.47 634 35.18 0.0006
2020-02-12 2019-12-31 13F ALECTOR COM 014442107 27,232 25,430 1,411.21 469 1,703.85 0.0003
2019-11-08 2019-09-30 13F ALECTOR COM 014442107 1,802 -951 -34.54 26 -50.00 0.0000
2019-08-12 2019-06-30 13F ALECTOR COM 014442107 2,753 1,273 86.01 52 85.71 0.0000
2019-05-13 2019-03-31 13F ALECTOR COM 014442107 1,480 1,480 28 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.