Stock

Quantum Corp

Ticker not mapped · held by 40 managers

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Reported value

$12.7M

Holders

+1 new · −1 exited

Holders’ est. mark

−$23.3K

Price effect on 3 books still in the name

Largest holder

$4.03M

Vanguard

Notable conviction

Share of each notable manager’s 13F book.

State Street0.0% · $585.1K
Vanguard0.0% · $4.03M

Holder count by quarter

Q3 2024 Q4 2024 Q1 2025 Q2 2025 Q3 2025 Q4 2025 Q1 2026

Who holds it

Notable only

Investor	Shares	Value	Est. mark	Change
Vanguard	625.5K	$4.03M	—	Held
Portolan Capital Management, LLC	477.2K	$3.08M	—	Held
BlackRock, Inc.	220.7K	$1.42M	—	Held
UBS Group AG	165.8K	$1.07M	—	Held
GEODE CAPITAL MANAGEMENT, LLC	156.9K	$1.01M	—	Held
State Street	90.7K	$585.1K	—	Held
AlphaQuest LLC	29.4K	$189.5K	—	Held
NORTHERN TRUST CORP	28.8K	$185.5K	—	Held
FLAGSHIP HARBOR ADVISORS, LLC	26.6K	$171.5K	—	New
MARSHALL WACE, LLP	21.7K	$140.2K	—	Held
BANK OF AMERICA CORP /DE/	20.5K	$132.4K	−$10K	Added$103.7K
LPL Financial LLC	18.4K	$118.4K	—	Held
Engineers Gate Manager LP	16.4K	$105.8K	—	Held
BARCLAYS PLC	14.2K	$91.6K	−$1.58K	Added$87.1K
CITIGROUP INC	12.8K	$82.7K	—	Held
XTX Topco Ltd	11.9K	$77.1K	—	Held
MILLENNIUM MANAGEMENT LLC	11.2K	$72.5K	—	Held
MORGAN STANLEY	4.31K	$27.8K	−$11.6K	Cut−$5.48K
NBC SECURITIES, INC.	4K	$25.8K	—	Held
WELLS FARGO & COMPANY/MN	3.52K	$22.7K	—	Held
SBI Securities Co., Ltd.	2.42K	$15.6K	—	Held
JONES FINANCIAL COMPANIES LLLP	1.84K	$11.9K	—	Held
BNP PARIBAS FINANCIAL MARKETS	1.02K	$6.57K	—	Held
ROYAL BANK OF CANADA	833	$5K	—	Held
OSAIC HOLDINGS, INC.	748	$4.82K	—	Held
Tower Research Capital LLC (TRC)	582	$3.75K	—	Held
FEDERATED HERMES, INC.	501	$3.23K	—	Held
Quattro Advisors LLC	400	$2.58K	—	Held
FIFTH THIRD BANCORP	295	$1.9K	—	Held
EFG International AG	100	$645	—	Held
NATIONAL BANK OF CANADA /FI/	100	$644	—	Held
Cygnus Capital Advisors, LLC	69.4K	$448	—	Held
Global Retirement Partners, LLC	65	$419	—	Held
Federation des caisses Desjardins du Quebec	25	$161	—	Held
PRICE T ROWE ASSOCIATES INC /MD/	15.9K	$103	—	Held
NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	15	$97	—	Held
JPMORGAN CHASE & CO	8	$52	—	Held
Farther Finance Advisors, LLC	4	$26	—	Held
Activest Wealth Management	1	$5	—	Held
Avion Wealth	68	$0	—	Held

Who left

FNY Investment Advisers, LLC$2

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.