QNTM · NASDAQ · Biotechnology

Quantum BioPharma (QNTM)

Develops clinical-stage treatments while retaining investments and consumer-product economics.

$3.07
Pre-market−0.05 (−1.61%)
At close$3.12(+2.63%)

Breakdown13F · 13D/G · Form 4

Institutions24 holders · as of Mar 31, 20263.97%254.3K shares
Otherremainder96.03%6.14M shares

6.40M company shares as of Aug 21, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

The share count has not been confirmed by a second filing; stakes use it as it stands.

Top shareholders13F · 13D/G · Form 4

HolderStakeSharesEvidence
Advisorshares Investments LLCInstitution
1.70%108,59113Fas of Mar 31, 2026
Platform Technology PartnersInstitution
0.64%41,11613Fas of Mar 31, 2026
Jane Street Group, LLCInstitution
0.49%31,50113Fas of Mar 31, 2026
Citadel Advisors LLCInstitution
0.25%15,86313Fas of Mar 31, 2026
Marex Group PLCInstitution
0.21%13,46813Fas of Mar 31, 2026
Virtu Financial LLCInstitution
0.19%12,28213Fas of Mar 31, 2026
Mariner, LLCInstitution
0.16%10,05913Fas of Mar 31, 2026
UBS Group AGInstitution
0.11%7,23713Fas of Mar 31, 2026
Advisor Group Holdings, Inc.Institution
0.10%6,37513Fas of Mar 31, 2026
Steward Partners Investment Advisory, LLCInstitution
0.07%4,38113Fas of Mar 31, 2026
Atlantic Union Bankshares CorpInstitution
0.02%1,00013Fas of Mar 31, 2026
Farther Finance Advisors, LLCInstitution
0.02%1,00013Fas of Mar 31, 2026
Jones Financial Companies LLLPInstitution
0.01%70013Fas of Mar 31, 2026
Cetera Trust Company, N.AInstitution
0.00%25013Fas of Mar 31, 2026
Wells Fargo & Company/MNInstitution
0.00%10013Fas of Mar 31, 2026
Federation Des Caisses Desjardins du QuebecInstitution
0.00%9313Fas of Mar 31, 2026
Sbi Securities Co., Ltd.Institution
0.00%7513Fas of Mar 31, 2026
Tower Research Capital LLC (TRC)Institution
0.00%7113Fas of Mar 31, 2026
Group One Trading, L.P.Institution
0.00%3413Fas of Mar 31, 2026
Rockefeller Capital Management L.P.Institution
0.00%3013Fas of Mar 31, 2026
National Bank of Canada /FI/Institution
0.00%2013Fas of Mar 31, 2026
TD Waterhouse Canada Inc.Institution
0.00%2013Fas of Mar 31, 2026
Activest Wealth ManagementInstitution
0.00%1513Fas of Mar 31, 2026
Purpose Unlimited Inc.Institution
0.00%113Fas of Mar 31, 2026

13F — a manager's quarterly holdings

Institutions13F, as of Mar 31, 2026

24 holders · 254.3K shares · 7 new positions · 14 increased · 0 reduced · 6 closed

HolderShares% outstandingChg q/qFiled
Advisorshares Investments LLC108.6K1.70%+59.0KApr 28, 2026
Platform Technology Partners41.1K0.64%+41.1KnewApr 27, 2026
Jane Street Group, LLC31.5K0.49%+20.6KMay 12, 2026
Citadel Advisors LLC15.9K0.25%0May 15, 2026
Marex Group PLC13.5K0.21%+32May 13, 2026
Virtu Financial LLC12.3K0.19%+1.9KMay 14, 2026
Mariner, LLC10.1K0.16%+10.1KnewMay 13, 2026
UBS Group AG7.2K0.11%+5.5KMay 5, 2026

Ownership statements13D/G · 5% or more, as filed

No 13D/G filer at 5% or more on record.

Insider tradesForm 4

Latest trades

Nothing filed in the last 12 months.

CongressHouse and Senate disclosures

Not reported.