Greenwich LifeSciences, Inc. (GLSI) Ownership
GLSI ownership summary
as of October 18, 2026- Institutions
- 12.3% of shares outstanding
- Insiders
- 47.91% of shares outstanding
- Shares outstanding
- 14.7M
- Float
- 7.6M shares available to trade
- Short interest
- 20.66% 1.6M shares short
- Days to cover
- 13.74 short interest down 3.1% vs prior month
- Institutions 12.26%
- Insiders 47.91%
- Other investors 39.82%
GLSI top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 3.31% | 486K | $7.1M | +51,994 (+12.0%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 1.90% | 278K | $4.0M | −20,076 (−6.7%) | June 30, 2026 |
| 3 | Geode Capital Management, LLC | 1.15% | 168K | $2.4M | +12,713 (+8.2%) | June 30, 2026 |
| 4 | State Street Corp | 0.97% | 143K | $2.1M | +9,211 (+6.9%) | June 30, 2026 |
| 5 | Vanguard Portfolio Management, LLC | 0.55% | 81K | $1.2M | +21,950 (+37.3%) | June 30, 2026 |
| 6 | Northern Trust Corp | 0.55% | 80K | $1.2M | +5,103 (+6.8%) | June 30, 2026 |
| 7 | Bank of New York Mellon Corp | 0.33% | 48K | $696,945 | +1,377 (+3.0%) | June 30, 2026 |
| 8 | Vanguard Fiduciary Trust Co | 0.31% | 46K | $668,791 | +1,057 (+2.4%) | June 30, 2026 |
| 9 | Morgan Stanley - Brokerage Accounts | 0.30% | 43K | $632,154 | +13,620 (+45.7%) | June 30, 2026 |
| 10 | The Goldman Sachs Group Inc | 0.27% | 39K | $572,237 | −192 (−0.5%) | June 30, 2026 |
| 11 | Jane Street Group LLC | 0.19% | 28K | $402,948 | +27,694 (0.0%) | June 30, 2026 |
| 12 | UBS Group AG | 0.16% | 23K | $340,601 | +2,293 (+10.9%) | June 30, 2026 |
| 13 | State Of Wisconsin Investment Board | 0.15% | 23K | $329,397 | +2,300 (+11.3%) | June 30, 2026 |
| 14 | GSA Capital Partners LLP | 0.13% | 20K | $284,351 | +19,543 (0.0%) | June 30, 2026 |
| 15 | Massachusetts Financial Services Company | 0.12% | 18K | $260,765 | +17,922 (0.0%) | June 30, 2026 |
| 16 | STRS OHIO | 0.12% | 18K | $258,990 | +4,100 (+29.9%) | June 30, 2026 |
| 17 | Charles Schwab Investment Management Inc | 0.12% | 17K | $248,776 | +495 (+3.0%) | June 30, 2026 |
| 18 | Vanguard Global Advisers, LLC | 0.08% | 12K | $172,723 | +1,536 (+14.9%) | June 30, 2026 |
| 19 | Ancora Advisors LLC | 0.07% | 11K | $156,267 | −26,760 (−71.4%) | June 30, 2026 |
| 20 | Stifel Financial Corp | 0.07% | 10K | $145,835 | +10,023 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 17 holders added 203K shares and 3 cut 47K.
GLSI top mutual fund and ETF holders
19 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Russell 2000 ETF | 1.37% | 201K | $2.9M | −2,304 (−1.1%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 1.36% | 199K | $2.9M | — | August 31, 2026 |
| 3 | Fidelity Small Cap Index | 0.51% | 74K | $1.1M | +680 (+0.9%) | July 31, 2026 |
| 4 | iShares Russell 2000 Growth ETF | 0.50% | 73K | $1.1M | −92 (−0.1%) | September 30, 2026 |
| 5 | Vanguard Russell 2000 ETF | 0.26% | 39K | $562,052 | +720 (+1.9%) | August 31, 2026 |
| 6 | Vanguard US Momentum Factor ETF | 0.23% | 34K | $498,672 | +13,177 (+62.5%) | June 30, 2026 |
| 7 | Fidelity Extended Market Index | 0.23% | 33K | $485,752 | +3,181 (+10.5%) | August 31, 2026 |
| 8 | iShares Micro-Cap ETF | 0.17% | 25K | $360,505 | −171 (−0.7%) | September 30, 2026 |
| 9 | Ancora/Thelen Small-Mid Cap I | 0.14% | 20K | $291,000 | +20,000 (0.0%) | September 30, 2026 |
| 10 | Stt Strt SPDR® Russell2000 US SmCapETF | 0.13% | 19K | $270,164 | +896 (+5.1%) | August 31, 2026 |
| 11 | Schwab Small Cap Index | 0.11% | 16K | $235,870 | — | August 31, 2026 |
| 12 | Fidelity Total Market Index | 0.08% | 12K | $179,183 | — | August 31, 2026 |
| 13 | iShares Russell 2000 Small-Cap Idx Instl | 0.08% | 12K | $170,322 | — | August 31, 2026 |
| 14 | MFS Blended Research Small Cap Eq R6 | 0.08% | 11K | $166,728 | −123 (−1.1%) | August 31, 2026 |
| 15 | Fidelity Series Total Market Index | 0.07% | 9,629 | $140,102 | — | August 31, 2026 |
| 16 | Vanguard Global Momentum Factor ETF CAD | 0.07% | 9,565 | $139,171 | +2,838 (+42.2%) | June 30, 2026 |
| 17 | Fidelity Nasdaq Composite Index | 0.06% | 8,961 | $130,383 | — | August 31, 2026 |
| 18 | Nuveen Small Cap Blend Idx R6 | 0.06% | 8,122 | $118,175 | — | August 31, 2026 |
| 19 | Vanguard Russell 2000 Growth ETF | 0.05% | 7,500 | $109,125 | +36 (+0.5%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
GLSI insider transactions
latest 8| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-01-13 | Snehal Patel | Buy | $29.83 | 1,800 | $53,694 |
| 2026-01-12 | Snehal Patel | Buy | $27.54 | 2,900 | $79,866 |
| 2025-12-31 | Snehal Patel | Buy | $21.36 | 4,300 | $91,848 |
| 2025-12-30 | Snehal Patel | Buy | $21.73 | 2,900 | $63,017 |
| 2025-12-18 | Snehal Patel | Buy | $12.62 | 4,100 | $51,742 |
| 2025-11-25 | Snehal Patel | Buy | $8.37 | 4,600 | $38,502 |
| 2025-11-07 | Snehal Patel | Buy | $8.43 | 10,600 | $89,358 |
| 2025-10-31 | Snehal Patel | Buy | $9.26 | 2,300 | $21,298 |
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.
GLSI shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns GLSI
Institutional investors own 12.3% of Greenwich LifeSciences's shares and insiders 47.91%. The largest holder is BlackRock Inc with 3.31% of the shares (486K), as of June 30, 2026. Among the top 20 institutions, 17 added shares and 3 reduced their stake in the latest filings. Short interest is 20.66% of the float, or 13.74 days of average trading volume. The share count rose 20.6% since 2018.
Related: GLSI analyst forecast, GLSI key metrics. See the GLSI stock overview for the latest quote and news.
GLSI ownership FAQ
Who owns the most Greenwich LifeSciences stock?
The largest shareholders of Greenwich LifeSciences are BlackRock Inc (3.31%), Vanguard Capital Management, LLC (1.90%), Geode Capital Management, LLC (1.15%), State Street Corp (0.97%), Vanguard Portfolio Management, LLC (0.55%).
What percentage of Greenwich LifeSciences is owned by institutions?
Institutions hold 12.3% of Greenwich LifeSciences's shares outstanding; insiders hold 47.91%.
Which funds own Greenwich LifeSciences?
The largest fund holders of Greenwich LifeSciences are iShares Russell 2000 ETF (1.37%), Vanguard MStar Total Stk Mkt Idx Invest (1.36%), Fidelity Small Cap Index (0.51%), iShares Russell 2000 Growth ETF (0.50%), Vanguard Russell 2000 ETF (0.26%).
What is Greenwich LifeSciences's short interest?
1.6M shares of Greenwich LifeSciences were sold short, 20.66% of the float; at the average daily volume it would take 13.74 days to cover.
Are insiders buying or selling Greenwich LifeSciences?
Of the latest 8 reported insider transactions in Greenwich LifeSciences (since October 31, 2025), 8 were purchases and 0 were sales.
How many shares of Greenwich LifeSciences are outstanding?
Greenwich LifeSciences has 14.7M shares outstanding, of which 7.6M are in the public float.