Stock

Quantum Corp

Ticker not mapped · held by 37 managers

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Reported value

$6.96M

Holders

+7 new · −11 exited

Holders’ est. mark

−$1.17M

Price effect on 27 books still in the name

Largest holder

$2.56M

VANGUARD CAPITAL MANAGEMENT LLC

Notable conviction

Share of each notable manager’s 13F book.

State Street0.0% · $345.9K

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 CAPITAL MANAGEMENT LLC	539.3K	$2.56M	—	Held
BlackRock, Inc.	217.5K	$1.03M	−$369.8K	Cut−$390.5K
GEODE CAPITAL MANAGEMENT, LLC	159.2K	$756.5K	−$266.5K	Cut−$255.5K
UBS Group AG	99.1K	$470.6K	−$168.4K	Cut−$599.1K
VANGUARD FIDUCIARY TRUST CO	80.3K	$381.2K	—	Held
State Street	72.8K	$345.9K	−$123.8K	Cut−$239.2K
SONA ASSET MANAGEMENT (US) LLC	70.1K	$332.9K	—	New
MARSHALL WACE, LLP	37.5K	$178.3K	−$37K	Added$38K
NORTHERN TRUST CORP	28.8K	$136.6K	−$48.9K	Cut−$48.9K
LPL Financial LLC	24.6K	$116.8K	−$31.2K	Cut−$1.61K
BANK OF AMERICA CORP /DE/	20.5K	$97.3K	−$34.8K	Cut−$35.1K
FLAGSHIP HARBOR ADVISORS, LLC	17.2K	$81.6K	−$29.2K	Cut−$89.8K
BRIDGEWAY CAPITAL MANAGEMENT, LLC	16.2K	$77.1K	—	New
MORGAN STANLEY	15.2K	$72.1K	−$7.33K	Added$44.3K
Kovack Advisors, Inc.	12.5K	$62.8K	—	New
BARCLAYS PLC	12.4K	$59.1K	−$21.2K	Cut−$32.5K
R Squared Ltd	12.2K	$58.2K	—	New
XTX Topco Ltd	11.3K	$53.8K	−$19.2K	Cut−$23.3K
Vanguard Global Advisers, LLC	6K	$28.5K	—	Held
WELLS FARGO & COMPANY/MN	4.13K	$19.6K	−$5.99K	Cut−$3.14K
SBI Securities Co., Ltd.	2K	$9.52K	−$3.41K	Cut−$6.12K
HOLLENCREST CAPITAL MANAGEMENT	2K	$9.5K	—	New
JONES FINANCIAL COMPANIES LLLP	1.47K	$6.87K	−$2.6K	Cut−$5.01K
OSAIC HOLDINGS, INC.	965	$4.58K	−$1.27K	Cut−$239
FEDERATED HERMES, INC.	835	$3.97K	−$851	Added$735
BNP PARIBAS FINANCIAL MARKETS	261	$1.24K	−$444	Cut−$5.33K
ROYAL BANK OF CANADA	128	$1K	$232	Cut−$4K
Cygnus Capital Advisors, LLC	124.1K	$590	−$118	Added$142
EFG International AG	100	$477	−$168	Cut−$168
NATIONAL BANK OF CANADA /FI/	100	$475	−$169	Cut−$169
Rialto Wealth Management, LLC	87	$414	—	New
Lavaca Capital LLC	39	$185	—	New
Federation des caisses Desjardins du Quebec	25	$119	−$42	Cut−$42
PRICE T ROWE ASSOCIATES INC /MD/	21.8K	$104	−$27	Added$1
JPMORGAN CHASE & CO	8	$34	−$18	Cut−$18
Farther Finance Advisors, LLC	4	$20	−$6	Cut−$6
Activest Wealth Management	1	$4	−$1	Cut−$1

Who left

Portolan Capital Management, LLC$3.08M
AlphaQuest LLC$189.5K
Engineers Gate Manager LP$105.8K
CITIGROUP INC$82.7K
MILLENNIUM MANAGEMENT LLC$72.5K
NBC SECURITIES, INC.$25.8K
Tower Research Capital LLC (TRC)$3.75K
Quattro Advisors LLC$2.58K
FIFTH THIRD BANCORP$1.9K
NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$97
Avion Wealth$0

Positions as of Q1 2026. 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.