Alector, Inc. (ALEC) Ownership
ALEC ownership summary
as of October 17, 2026- Institutions
- 70.2% of shares outstanding
- Insiders
- 7.38% of shares outstanding
- Shares outstanding
- 111.7M
- Float
- 85.0M shares available to trade
- Short interest
- 5.83% 6.1M shares short
- Days to cover
- 4.35 short interest up 0.7% vs prior month
- Institutions 70.22%
- Insiders 7.38%
- Other investors 22.40%
ALEC top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | TCG Crossover Management, LLC | 8.96% | 10.0M | $18.4M | — | June 30, 2026 |
| 2 | Nantahala Capital Management, LLC | 7.73% | 8.6M | $15.9M | +5.8M (+206.7%) | June 30, 2026 |
| 3 | BlackRock Inc | 7.03% | 7.8M | $14.4M | +106,634 (+1.4%) | June 30, 2026 |
| 4 | Acadian Asset Management LLC | 3.95% | 4.4M | $8.1M | +375,560 (+9.3%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 3.59% | 4.0M | $7.4M | +330,618 (+9.0%) | June 30, 2026 |
| 6 | Kynam Capital Management, LP | 3.41% | 3.8M | $7.0M | +1.8M (+90.4%) | June 30, 2026 |
| 7 | Merck & Co Inc | 3.18% | 3.5M | $6.5M | — | June 30, 2026 |
| 8 | Balyasny Asset Management LLC | 2.91% | 3.2M | $6.0M | +312,173 (+10.6%) | June 30, 2026 |
| 9 | 683 Capital Management LLC | 2.87% | 3.2M | $5.9M | −150,000 (−4.5%) | March 31, 2026 |
| 10 | D. E. Shaw & Co LP | 2.65% | 3.0M | $5.4M | −372,852 (−11.2%) | June 30, 2026 |
| 11 | ADAR1 Capital Management LLC | 2.58% | 2.9M | $5.3M | +1.8M (+174.6%) | June 30, 2026 |
| 12 | Vanguard Portfolio Management, LLC | 2.53% | 2.8M | $5.2M | +236,951 (+9.2%) | June 30, 2026 |
| 13 | Geode Capital Management, LLC | 2.20% | 2.5M | $4.5M | +168,053 (+7.4%) | June 30, 2026 |
| 14 | Spruce Street Capital LP | 1.88% | 2.1M | $3.9M | — | June 30, 2026 |
| 15 | Millennium Management LLC | 1.78% | 2.0M | $3.7M | +9,609 (+0.5%) | June 30, 2026 |
| 16 | Ikarian Capital, LLC | 1.78% | 2.0M | $3.6M | −100,000 (−4.8%) | June 30, 2026 |
| 17 | State Street Corp | 1.68% | 1.9M | $3.5M | +14,239 (+0.8%) | June 30, 2026 |
| 18 | Jacobs Levy Equity Management, Inc. | 1.58% | 1.8M | $3.2M | −388,432 (−18.0%) | June 30, 2026 |
| 19 | Medici Capital LLC | 1.48% | 1.7M | $3.0M | — | June 30, 2026 |
| 20 | Affinity Asset Advisors, LLC | 1.35% | 1.5M | $2.8M | +1.0M (+202.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 12.0M shares and 4 cut 1.0M.
ALEC top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.54% | 2.8M | $5.2M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.29% | 2.6M | $4.7M | −29,504 (−1.1%) | September 30, 2026 |
| 3 | Fidelity Small Cap Index | 0.96% | 1.1M | $2.0M | −1,315 (−0.1%) | July 31, 2026 |
| 4 | iShares Russell 2000 Growth ETF | 0.74% | 828K | $1.5M | −1,048 (−0.1%) | September 30, 2026 |
| 5 | Vanguard Explorer Inv | 0.60% | 673K | $1.2M | +78,152 (+13.1%) | June 30, 2026 |
| 6 | Vanguard Strategic Small-Cap Equity Inv | 0.56% | 629K | $1.2M | — | June 30, 2026 |
| 7 | Vanguard VIF Small Co Gr | 0.55% | 616K | $1.1M | — | June 30, 2026 |
| 8 | Vanguard Russell 2000 ETF | 0.50% | 563K | $1.0M | +11,160 (+2.0%) | August 31, 2026 |
| 9 | Schwab US Small-Cap ETF™ | 0.45% | 503K | $926,431 | +333 (+0.1%) | September 30, 2026 |
| 10 | Fidelity Extended Market Index | 0.32% | 360K | $661,852 | −1,933 (−0.5%) | August 31, 2026 |
| 11 | Mackenzie GQE US Small Cap F8 | 0.30% | 333K | $613,324 | +40,849 (+14.0%) | July 31, 2026 |
| 12 | iShares Micro-Cap ETF | 0.26% | 294K | $541,606 | −2,030 (−0.7%) | September 30, 2026 |
| 13 | Xtrackers MSCI World Swap ETF 1C | 0.24% | 265K | $487,363 | −1,667 (−0.6%) | December 31, 2025 |
| 14 | Schwab Small Cap Index | 0.21% | 239K | $440,295 | — | August 31, 2026 |
| 15 | Vanguard Health Care ETF | 0.21% | 233K | $428,291 | +984 (+0.4%) | August 31, 2026 |
| 16 | BSF Systematic US Eq Abs Ret A2 USD | 0.18% | 201K | $370,508 | — | December 31, 2025 |
| 17 | iShares Russell 2000 Small-Cap Idx Instl | 0.18% | 196K | $360,449 | — | August 31, 2026 |
| 18 | Multi-Manager Small Cap Eq Strat Inst | 0.17% | 191K | $351,348 | −33,580 (−15.0%) | August 31, 2026 |
| 19 | Fidelity Total Market Index | 0.15% | 163K | $299,800 | — | August 31, 2026 |
| 20 | Invesco RAFI US 1500 Small-Mid ETF | 0.14% | 155K | $285,540 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ALEC insider transactions
latest 11| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-16 | Grace Wong-Sarad | Sell | $2.65 | 1,820 | $4,823 |
| 2026-03-10 | Grace Wong-Sarad | Sell | $2.65 | 1,000 | $2,650 |
| 2026-02-26 | Grace Wong-Sarad | Sell | $2.50 | 4,079 | $10,198 |
| 2025-12-05 | Grace Wong-Sarad | Sell | $1.21 | 4,753 | $5,751 |
| 2025-12-03 | Arnon Rosenthal | Sell | $1.12 | 104,347 | $116,869 |
| 2025-12-03 | Grace Wong-Sarad | Sell | $1.12 | 8,056 | $9,023 |
| 2025-12-03 | Neil Lindsay Berkley | Sell | $1.12 | 37,261 | $41,732 |
| 2025-12-03 | Sara Kenkare-Mitra | Sell | $1.12 | 41,687 | $46,689 |
| 2025-09-02 | Grace Wong-Sarad | Sell | $2.50 | 5,910 | $14,775 |
| 2025-08-26 | Paula Hammond | Sell | $2.36 | 14,000 | $33,040 |
| 2025-06-20 | Kristine Yaffe | Sell | $1.44 | 1,000 | $1,440 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ALEC shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ALEC
Institutional investors own 70.2% of Alector's shares and insiders 7.38%. The largest holder is TCG Crossover Management, LLC with 8.96% of the shares (10.0M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 4 reduced their stake in the latest filings. Short interest is 5.83% of the float, or 4.35 days of average trading volume. The share count rose 1,371.4% since 2016.
Related: ALEC analyst forecast, ALEC key metrics. See the ALEC stock overview for the latest quote and news.
ALEC ownership FAQ
Who owns the most Alector stock?
The largest shareholders of Alector are TCG Crossover Management, LLC (8.96%), Nantahala Capital Management, LLC (7.73%), BlackRock Inc (7.03%), Acadian Asset Management LLC (3.95%), Vanguard Capital Management, LLC (3.59%).
What percentage of Alector is owned by institutions?
Institutions hold 70.2% of Alector's shares outstanding; insiders hold 7.38%.
Which funds own Alector?
The largest fund holders of Alector are Vanguard MStar Total Stk Mkt Idx Invest (2.54%), iShares Russell 2000 ETF (2.29%), Fidelity Small Cap Index (0.96%), iShares Russell 2000 Growth ETF (0.74%), Vanguard Explorer Inv (0.60%).
What is Alector's short interest?
6.1M shares of Alector were sold short, 5.83% of the float; at the average daily volume it would take 4.35 days to cover.
Are insiders buying or selling Alector?
Of the latest 11 reported insider transactions in Alector (since June 20, 2025), 0 were purchases and 11 were sales.
How many shares of Alector are outstanding?
Alector has 111.7M shares outstanding, of which 85.0M are in the public float.