STAK Inc. (STAK) Ownership
STAK ownership summary
as of October 18, 2026- Institutions
- 3.3% of shares outstanding
- Insiders
- 0.00% of shares outstanding
- Shares outstanding
- 10.0M
- Float
- 6.9M shares available to trade
- Short interest
- 68.36% 554K shares short
- Days to cover
- 0.22 short interest up 53.2% vs prior month
- Institutions 3.28%
- Other investors 96.72%
STAK top institutional holders
12 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | HRT FINANCIAL LLC | 0.68% | 131K | $133,458 | +131,486 (0.0%) | June 30, 2026 |
| 2 | Jane Street Group LLC | 0.68% | 131K | $133,187 | +76,816 (+141.2%) | June 30, 2026 |
| 3 | XTX Topco Ltd | 0.11% | 21K | $21,675 | +21,355 (0.0%) | June 30, 2026 |
| 4 | UBS Group AG | 0.11% | 20K | $20,540 | +12,147 (+150.2%) | June 30, 2026 |
| 5 | Scientech Research LLC | 0.09% | 17K | $16,756 | +16,508 (0.0%) | June 30, 2026 |
| 6 | Tower Research Capital LLC | 0.03% | 5,000 | $5,075 | +2,100 (+72.4%) | June 30, 2026 |
| 7 | Royal Bank of Canada | <0.01% | 100 | $101 | +100 (0.0%) | June 30, 2026 |
| 8 | Caitong International Asset Management Co., Limited. | 0.00% | 1 | $1 | +1 (0.0%) | June 30, 2026 |
| 9 | Morgan Stanley - Brokerage Accounts | 0.00% | — | — | −50,000 (−100.0%) | June 30, 2026 |
| 10 | Wells Fargo & Co | 0.00% | — | — | −2,500 (−100.0%) | June 30, 2026 |
| 11 | Moors & Cabot Inc | 0.00% | — | — | −10,000 (−100.0%) | March 31, 2026 |
| 12 | Citadel Advisors Llc | 0.00% | — | — | −54,125 (−100.0%) | March 31, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 12, 8 holders added 261K shares and 4 cut 117K.
STAK top mutual fund and ETF holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Fidelity Nasdaq Composite Index | 0.01% | 2,513 | $2,551 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
STAK shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns STAK
Institutional investors own 3.3% of STAK's shares and insiders 0.00%. The largest holder is HRT FINANCIAL LLC with 0.68% of the shares (131K), as of June 30, 2026. Among the top 12 institutions, 8 added shares and 4 reduced their stake in the latest filings. Short interest is 68.36% of the float, or 0.22 days of average trading volume. The share count rose 17.4% since 2023.
Related: STAK key metrics. See the STAK stock overview for the latest quote and news.
STAK ownership FAQ
Who owns the most STAK stock?
The largest shareholders of STAK are HRT FINANCIAL LLC (0.68%), Jane Street Group LLC (0.68%), XTX Topco Ltd (0.11%), UBS Group AG (0.11%), Scientech Research LLC (0.09%).
What percentage of STAK is owned by institutions?
Institutions hold 3.3% of STAK's shares outstanding; insiders hold 0.00%.
Which funds own STAK?
The largest fund holders of STAK are Fidelity Nasdaq Composite Index (0.01%).
What is STAK's short interest?
554K shares of STAK were sold short, 68.36% of the float; at the average daily volume it would take 0.22 days to cover.
How many shares of STAK are outstanding?
STAK has 10.0M shares outstanding, of which 6.9M are in the public float.