Who owns Alector (ALEC)
Which tracked institutional funds hold ALEC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ALEC company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
9 tracked funds added or opened ALEC while 21 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ALEC’s largest tracked holder by dollar value, TCG Crossover Management, LLC, sizes it at 0.5% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.5pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ALEC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 139 tracked filers holding ALEC, 72 increased or opened the position and 47 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ALEC between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 1
- CANTOR FITZGERALD, L. P.$594K
Full exits 3
- ACADIAN ASSET MANAGEMENT LLC$9M
- Foresite Capital Management IV, LLC$8M
- JANE STREET GROUP, LLC$859K
Largest adds
- ADAR1 Capital Management, LLC$4M
- Kynam Capital Management, LP$3M
- Nantahala Capital Management, LLC$3M
- Affinity Asset Advisors, LLC$2M
- AQR CAPITAL MANAGEMENT LLC$1M
- CITADEL ADVISORS LLC$620K
Largest trims
- TCG Crossover Management, LLC$1M
- D. E. Shaw & Co., Inc.$1M
- JACOBS LEVY EQUITY MANAGEMENT, INC$1M
- FMR LLC$1M
- EverSource Wealth Advisors, LLC$974K
- RENAISSANCE TECHNOLOGIES LLC$889K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| TCG Crossover Management, LLC | 10,000,000 | $20M | 11.5% | 2026-Q2 |
| BlackRock, Inc. added | 7,847,879 | $16M | 9.0% | 2026-Q2 |
| Nantahala Capital Management, LLC added | 4,318,109 | $9M | 5.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 4,009,340 | $8M | 4.6% | 2026-Q2 |
| Kynam Capital Management, LP added | 3,808,494 | $8M | 4.4% | 2026-Q2 |
| Merck & Co., Inc. | 3,545,719 | $7M | 4.1% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 3,247,426 | $7M | 3.7% | 2026-Q2 |
| 683 Capital Management, LLC | 3,200,000 | $6M | 3.7% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 2,959,983 | $6M | 3.4% | 2026-Q2 |
| ADAR1 Capital Management, LLC added | 2,883,583 | $6M | 3.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 2,820,493 | $6M | 3.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,454,271 | $5M | 2.8% | 2026-Q2 |
| Spruce Street Capital LP | 2,101,068 | $4M | 2.4% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 1,988,835 | $4M | 2.3% | 2026-Q2 |
| Ikarian Capital, LLC trimmed | 1,982,606 | $4M | 2.3% | 2026-Q2 |
| STATE STREET CORP added | 1,879,765 | $4M | 2.2% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 1,765,929 | $4M | 2.0% | 2026-Q2 |
| MEDICI CAPITAL LLC | 1,652,520 | $3M | 1.9% | 2026-Q2 |
| Affinity Asset Advisors, LLC added | 1,510,000 | $3M | 1.7% | 2026-Q2 |
| Eversept Partners, LP added | 1,423,873 | $3M | 1.6% | 2026-Q2 |
| FMR LLC trimmed | 1,396,398 | $3M | 1.6% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,309,577 | $3M | 1.5% | 2026-Q2 |
| Euclidean Capital LLC | 1,307,858 | $3M | 1.5% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 1,109,770 | $2M | 1.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 1,098,388 | $2M | 1.3% | 2026-Q2 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 1,055,192 | $2M | 1.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 1,045,376 | $2M | 1.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 935,166 | $2M | 1.1% | 2026-Q2 |
| DAFNA Capital Management LLC | 908,351 | $2M | 1.0% | 2026-Q2 |
| Elmind Capital, LP | 900,000 | $2M | 1.0% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 845,999 | $2M | 1.0% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 818,831 | $2M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 773,462 | $2M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 663,592 | $1M | 0.8% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 598,559 | $1M | 0.7% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 532,850 | $1M | 0.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 433,875 | $872K | 0.5% | 2026-Q2 |
| XTX Topco Ltd trimmed | 399,681 | $803K | 0.5% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 391,232 | $786K | 0.5% | 2026-Q2 |
| CANTOR FITZGERALD, L. P. new | 295,492 | $594K | 0.3% | 2026-Q2 |
| UBS Group AG added | 273,780 | $550K | 0.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 257,139 | $517K | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 250,093 | $503K | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 224,530 | $451K | 0.3% | 2026-Q2 |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 200,000 | $402K | 0.2% | 2026-Q2 |
| LMR Partners LLP new | 200,000 | $402K | 0.2% | 2026-Q2 |
| Nuveen, LLC added | 176,234 | $354K | 0.2% | 2026-Q2 |
| Utah Retirement Systems | 154,290 | $310K | 0.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 142,678 | $287K | 0.2% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 142,500 | $286K | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 131,300 | $264K | 0.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 120,480 | $242K | 0.1% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO trimmed | 119,769 | $241K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 109,532 | $220K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 108,940 | $234K | 0.1% | 2026-Q2 |
| STRS OHIO added | 101,600 | $204K | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 98,496 | $198K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 89,172 | $179K | 0.1% | 2026-Q2 |
| SIMPLEX TRADING, LLC added | 85,488 | $172K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 81,655 | $165K | 0.1% | 2026-Q2 |
| Blackstone Inc. | 77,145 | $155K | 0.1% | 2026-Q2 |
| Jasper Ridge Partners, L.P. | 73,531 | $148K | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO added | 71,151 | $143K | 0.1% | 2026-Q2 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 69,666 | $140K | 0.1% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 60,570 | $122K | 0.1% | 2026-Q2 |
| Verdad Advisers, LP added | 60,509 | $122K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 58,696 | $118K | 0.1% | 2026-Q2 |
| Mariner, LLC added | 52,709 | $106K | 0.1% | 2026-Q2 |
| Vanguard Personalized Indexing Management, LLC trimmed | 49,445 | $99K | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC | 48,523 | $98K | 0.1% | 2026-Q2 |
| Graham Capital Management, L.P. trimmed | 46,496 | $93K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 46,275 | $93K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 45,190 | $91K | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 44,957 | $90K | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 42,998 | $89K | 0.1% | 2026-Q2 |
| DIVERSIFIED TRUST CO added | 42,351 | $85K | 0.0% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 33,728 | $68K | 0.0% | 2026-Q2 |
| Cerity Partners LLC added | 32,521 | $65K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 31,302 | $63K | 0.0% | 2026-Q2 |
| Cannell & Spears LLC trimmed | 30,342 | $61K | 0.0% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 30,251 | $49K | 0.0% | 2026-Q2 |
| Vontobel Holding Ltd. | 30,000 | $60K | 0.0% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 26,699 | $54K | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 26,122 | $53K | 0.0% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV new | 25,504 | $51K | 0.0% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 25,208 | $51K | 0.0% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC added | 24,530 | $49K | 0.0% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 24,123 | $48K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey | 23,426 | $47K | 0.0% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 21,898 | $44K | 0.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 21,200 | $43K | 0.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 19,397 | $39K | 0.0% | 2026-Q2 |
| Qube Research & Technologies Ltd new | 16,569 | $33K | 0.0% | 2026-Q2 |
| CAPTRUST FINANCIAL ADVISORS added | 16,037 | $32K | 0.0% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 16,015 | $32K | 0.0% | 2026-Q2 |
| Creative Planning trimmed | 15,015 | $30K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) added | 14,450 | $29K | 0.0% | 2026-Q2 |
| HAMILTON LANE ADVISORS LLC | 14,400 | $29K | 0.0% | 2026-Q2 |
| Quadrature Capital Ltd trimmed | 14,169 | $28K | 0.0% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 13,521 | $27K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.