ZEROSTACK CORP (ZSTK) Institutional Ownership

What the institutions did with ZSTK last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared

13

filed both this quarter and last

Managers holding

11

+1 on the quarter

Buyers

3

3 opened new

Sellers

5

2 sold out entirely

Buyer share

37.5%

of managers who traded it

Breadth

-25.0

net buyers, as a share of those trading

Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Largest holders

Manager	Shares	% of reported
VANGUARD CAPITAL MANAGEMENT LLC	25.4K	41.5%
GEODE CAPITAL MANAGEMENT, LLC	21.0K	34.3%
VANGUARD FIDUCIARY TRUST CO	12.6K	20.6%
Tower Research Capital LLC (TRC)	1.7K	2.8%
UBS Group AG	440	0.7%
ROYAL BANK OF CANADA	12	0.0%
OSAIC HOLDINGS, INC.	12	0.0%
MORGAN STANLEY	7	0.0%
BARCLAYS PLC	3	0.0%
CITIGROUP INC	1	0.0%
Key Financial Inc	1	0.0%

Largest changes

Manager	Action	Previous	Current	Change
GEODE CAPITAL MANAGEMENT, LLC	Reduced	25.3K	21.0K	-4.3K
Tower Research Capital LLC (TRC)	New	0	1.7K	+1.7K
UBS Group AG	Reduced	666	440	-226
MORGAN STANLEY	Reduced	173	7	-166
Sound Income Strategies, LLC	Sold Out	12	0	-12
Bernard Wealth Management Corp.	Sold Out	12	0	-12
BARCLAYS PLC	New	0	3	+3
CITIGROUP INC	New	0	1	+1

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.