STAK Inc. Ordinary Shares
STAK Inc. Ordinary Shares (STAK) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · STAK · as of Sep 30, 2025
Ownership Breakdown
3
Institutional Holders
▲ 1 vs Q2
$59,091
Total Inst. Value
▲ $7,891 vs Q2
10.01M
Shares Outstanding
freeFloat 17.03%
69,930
13F Shares Held
▲ 41,098 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
STAK largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 4 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
CITADEL ADVISORS LLC oil & gas field machinery & equipment | 41.6K | 38.76% | 38.76% | $35.16M | Nov 14, 2025 | NEW |
XTX TOPCO LTD oil & gas field machinery & equipment | 23.5K | 21.90% | 21.90% | $19.87M | Nov 14, 2025 | NEW |
UBS GROUP AG oil & gas field machinery & equipment | 4.8K | 4.48% | 4.48% | $4.06M | Nov 13, 2025 | ▼ 7.7K |
HRT FINANCIAL LP oil & gas field machinery & equipment | 0 | 0.00% | 0.00% | $0 | Nov 14, 2025 | EXIT |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
0
Increased
+0 shares2
New Positions
first time holders1
Decreased
−7.7K shares1
Sold Out
fully exitedNet shares change (top 50)
7.7K
+0 / −7.7K
Net new holders
+0
2 new / 1 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
STAK insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
WONISH ROBERT G director | Sep 28, 2015 | Purchase | 200,000 | $0.03 | $5.0K | 470.0K | Form 4 ↗ |
WONISH ROBERT G director | Sep 28, 2015 | Purchase | 200,000 | $0.03 | $5.0K | 470.0K | Form 4 ↗ |
Mikel Steven H. Chief Executive Officer | Sep 1, 2015 | Purchase | 300,000 | $0.03 | $7.5K | 300.0K | Form 4 ↗ |
WONISH ROBERT G director | Aug 25, 2015 | Purchase | 100,000 | $1.00 | $100.0K | 100.0K | Form 4 ↗ |
Mikel Steven H. Chief Executive Officer | Aug 25, 2015 | Purchase | 400,000 | $1.00 | $400.0K | 400.0K | Form 4 ↗ |
PATTERSON WILLIAM KIRK Sr. Vice President and CFO | Feb 1, 2008 | Tax Withhold | 1,878 | $1.78 | $3.3K | 6.0K | Form 4 ↗ |
PATTERSON WILLIAM KIRK Sr. Vice President and CFO | Dec 6, 2007 | Tax Withhold | 381 | $2.49 | $948.69 | 1.1K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
STAK Inc. Ordinary Shares (STAK) is primarily owned by institutional investors, who hold approximately 0.7% of total shares outstanding. Company insiders own approximately 82.97%, while retail and public investors account for the remaining 16.33%.
The largest institutional shareholder of STAK Inc. Ordinary Shares is CITADEL ADVISORS LLC, holding approximately 41,614 shares — equal to 38.76% of outstanding shares — as of September 30, 2025.
A total of 3 institutional investors currently hold STAK stock, with a combined institutional value of approximately $59,091 as of the most recent 13F filing period.
Frequently asked questions
STAK ownershipSTAK Inc. Ordinary Shares (STAK) is primarily owned by institutional investors, who hold approximately 0.7% of shares. The largest shareholder is CITADEL ADVISORS LLC with a 38.76% stake. Company insiders hold 82.97%. Data sourced from SEC Form 13F as of September 30, 2025.