ZSTK · ZeroStack Corp. · Shareholders & Ownership
Substantial doubt about the company's ability to continue as a going concern.
“These factors raise substantial doubt about the Company's ability to continue as a going concern within one year after the date these financial statements are issued. Although management has implemented the plans described above, it cannot conclude that such plans are probable of effectively mitigating the conditions and events that raise substantial doubt. Accordingly, substantial doubt exists about the Company's ability to continue as a going concern for the one-year period following the issuance of these financial statements.”View the 10-Q filed Jul 31, 2026
Every disclosed holder of ZSTK in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns ZSTK
13F quarter Jun 30, 2026| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 61,288 | 0.35% |
| Insiders (Forms 3, 4, 5) | 10,630,846 | 60.78% |
| 13D/G-only blocks | 5,420,360 | 30.99% |
| Remaining | 1,377,334 | 7.88% |
| Registered funds (N-PORT, not summed) | 46,610 | 0.27% |
Shares outstanding: 17,489,828, the issuer's latest cover-page count restated onto today's split basis.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of ZSTK
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
|
5,954,743 | ||
| 2 |
Heinrich Michael
13D
CIK 2093136 · Unknown · Jul 20, 2026
Item 4 purpose: none of the classified purposes
not summed
|
5,579,783 | ||
| 2.1 |
|
4,608,575 | ||
| 3 |
|
1,920,360 | ||
| 4 |
|
1,750,000 | ||
| 5 |
|
1,750,000 | ||
| 6 |
|
57,612 | ||
| 7 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
|
25,440 | ||
| 8 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
25,440 | ||
| 9 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
|
20,994 | ||
| 10 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
16,976 | ||
| 11 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
|
12,648 | ||
| 12 |
|
6,410 | ||
| 13 |
|
3,506 | ||
| 14 |
Fidelity Series Total Market Index Fund
Fund
S000065248 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
2,282 | ||
| 15 |
Tower Research Capital LLC (TRC)
13F
CIK 1533421 · Unknown · Jun 30, 2026
|
1,730 | ||
| 16 |
Fidelity Total Market Index Fund
Fund
S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
1,489 | ||
| 17 |
UBS Group AG
13F
CIK 1610520 · Bank · Jun 30, 2026
|
440 | ||
| 18 |
Fidelity Nasdaq Composite Index Fund
Fund
S000055366 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
423 | ||
| 19 |
OSAIC HOLDINGS, INC.
13F
CIK 1677044 · Holding company · Jun 30, 2026
|
12 | ||
| 20 |
ROYAL BANK OF CANADA
13F
CIK 1000275 · Bank · Jun 30, 2026
|
12 | ||
| 21 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
|
7 | ||
| 22 |
BARCLAYS PLC
13F
CIK 312069 · Bank · Jun 30, 2026
|
3 | ||
| 23 |
CITIGROUP INC
13F
CIK 831001 · Bank · Jun 30, 2026
|
1 | ||
| 24 |
Key Financial Inc
13F
CIK 1801720 · Registered investment adviser · Jun 30, 2026
|
1 |
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.