13D·WATCH Activist + Insider Intelligence Live feed Blog About Pricing
ISSUER PROFILE · CIK 0001790169 · CUSIP 339764102

ZeroStack Corp.ZSTK

5 13D/G filings 4 distinct filers 0 insider transactions (365d)

Post-Filing Returns · across 2 activist filings on this issuer

Median 30d
0.0%
avg 0.0%
Median 60d
0.0%
avg 0.0%
Median 90d
0.0%
avg 0.0%
Median 180d
0.0%
avg 0.0%

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
5
3 SCHEDULE 13D/A · 2 SCHEDULE
Distinct filers
4
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
1.07
as of 2026-07-15

13D/G Filings Timeline · 5 total

FiledFormFilerStakeSharesIntent
2026-07-21 SCHEDULE 13D/A Heinrich Michael 5,579,783 view →
2026-07-21 SCHEDULE 13D/A Reis-Faria Daniel 6,925,951 view →
2026-07-21 SCHEDULE 13D/A Vaiman Dany 513,249 view →
2025-07-21 SCHEDULE Starke Clifford 17.10% 3,850,886 view →
2025-07-21 SCHEDULE Vaiman Dany 4.80% 1,078,011 view →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-07-15 43,126 1.07 +45.6%
2026-06-30 29,615 2.50 -17.6%
2026-06-15 35,920 8.83 -2.8%
2026-05-29 36,953 4.09 -2.9%
2026-05-15 38,049 1.23 -6.9%
2026-04-30 40,881 3.81 -13.0%
2026-04-15 46,988 2.91 +25.4%
2026-03-31 37,467 1.76 +52.0%
2026-03-13 24,651 1.29 +65.0%
2026-02-27 14,942 1.00 -36.7%
2026-02-13 23,611 1.00 -81.9%
2026-01-30 130,353 1.00 +473.8%

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