Quantum BioPharma Ltd. (QNTM) Ownership
QNTM ownership summary
as of October 18, 2026- Institutions
- 12.0% of shares outstanding
- Insiders
- 7.46% of shares outstanding
- Shares outstanding
- 6.4M
- Float
- 7.6M shares available to trade
- Short interest
- 4.82% 361K shares short
- Days to cover
- 1.86 short interest up 48.9% vs prior month
- Institutions 12.00%
- Insiders 7.46%
- Other investors 80.55%
QNTM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | AdvisorShares Investments, LLC | 2.52% | 204K | $502,803 | +94,973 (+87.5%) | June 30, 2026 |
| 2 | Jane Street Group LLC | 0.60% | 48K | $119,437 | +16,854 (+53.5%) | June 30, 2026 |
| 3 | Platform Technology Partners | 0.51% | 41K | $101,557 | — | June 30, 2026 |
| 4 | UBS Group AG | 0.41% | 33K | $82,510 | +26,168 (+361.6%) | June 30, 2026 |
| 5 | Steward Partners Investment Advisory, LLC | 0.34% | 28K | $68,866 | +23,500 (+536.4%) | June 30, 2026 |
| 6 | Citadel Advisors Llc | 0.20% | 16K | $39,182 | — | June 30, 2026 |
| 7 | Marex Group Ltd | 0.17% | 13K | $33,187 | −32 (−0.2%) | June 30, 2026 |
| 8 | Mariner Wealth Advisors LLC | 0.12% | 10K | $24,700 | −59 (−0.6%) | June 30, 2026 |
| 9 | Nbc Securities Inc | 0.09% | 7,000 | $17,290 | +7,000 (0.0%) | June 30, 2026 |
| 10 | Advisor Group Holdings, Inc. | 0.08% | 6,295 | $15,549 | −80 (−1.3%) | June 30, 2026 |
| 11 | Global Retirement Partners, LLC. | 0.04% | 3,000 | $7,410 | +3,000 (0.0%) | June 30, 2026 |
| 12 | JONES FINANCIAL COMPANIES LLLP | 0.01% | 1,209 | $2,986 | +509 (+72.7%) | June 30, 2026 |
| 13 | Atlantic Union Bankshares Corp | 0.01% | 1,000 | $2,470 | — | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 0.01% | 600 | $1,482 | +600 (0.0%) | June 30, 2026 |
| 15 | Royal Bank of Canada | 0.01% | 446 | $1,102 | +446 (0.0%) | June 30, 2026 |
| 16 | Wells Fargo & Co | <0.01% | 250 | $618 | +150 (+150.0%) | June 30, 2026 |
| 17 | Cetera Trust Co NA | <0.01% | 250 | $618 | — | June 30, 2026 |
| 18 | Mercer Global Advisors Inc. | <0.01% | 190 | $469 | +190 (0.0%) | June 30, 2026 |
| 19 | Federation des caisses Desjardins du Quebec | <0.01% | 93 | $230 | — | June 30, 2026 |
| 20 | SBI Securities Co Ltd | <0.01% | 79 | $195 | +4 (+5.3%) | 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 173K shares and 3 cut 171.
QNTM top mutual fund and ETF holders
1 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | AdvisorShares Psychedelics ETF | 4.95% | 400K | $988,934 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
QNTM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns QNTM
Institutional investors own 12.0% of Quantum BioPharma's shares and insiders 7.46%. The largest holder is AdvisorShares Investments, LLC with 2.52% of the shares (204K), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 3 reduced their stake in the latest filings. Short interest is 4.82% of the float, or 1.86 days of average trading volume. The share count rose 3,749.2% since 2016.
Related: QNTM analyst forecast, QNTM key metrics. See the QNTM stock overview for the latest quote and news.
QNTM ownership FAQ
Who owns the most Quantum BioPharma stock?
The largest shareholders of Quantum BioPharma are AdvisorShares Investments, LLC (2.52%), Jane Street Group LLC (0.60%), Platform Technology Partners (0.51%), UBS Group AG (0.41%), Steward Partners Investment Advisory, LLC (0.34%).
What percentage of Quantum BioPharma is owned by institutions?
Institutions hold 12.0% of Quantum BioPharma's shares outstanding; insiders hold 7.46%.
Which funds own Quantum BioPharma?
The largest fund holders of Quantum BioPharma are AdvisorShares Psychedelics ETF (4.95%).
What is Quantum BioPharma's short interest?
361K shares of Quantum BioPharma were sold short, 4.82% of the float; at the average daily volume it would take 1.86 days to cover.
How many shares of Quantum BioPharma are outstanding?
Quantum BioPharma has 6.4M shares outstanding, of which 7.6M are in the public float.