SEALSQ Corp
SEALSQ Corp (LAES) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · LAES · as of Sep 30, 2025
Ownership Breakdown
81
Institutional Holders
▲ 20 vs Q2
$20.88M
Total Inst. Value
▼ $7.14M vs Q2
142.59M
Shares Outstanding
freeFloat 79.62%
5.42M
13F Shares Held
▼ 1.53M 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
LAES largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
SUSQUEHANNA INTERNATIONAL GROUP, LLP semiconductors & related devices | 6.12M | 5.25% | 5.25% | $22.88B | Nov 14, 2025 | ▲ 5.36M |
CITADEL ADVISORS LLC semiconductors & related devices | 1.55M | 1.33% | 1.33% | $5.79B | Nov 14, 2025 | ▲ 1.39M |
JANE STREET GROUP, LLC semiconductors & related devices | 1.35M | 1.16% | 1.16% | $5.04B | Nov 14, 2025 | ▲ 1.28M |
PEAK6 LLC semiconductors & related devices | 1.20M | 1.03% | 1.03% | $4.51B | Mar 31, 2026 | NEW |
NATIONAL BANK OF CANADA /FI/ semiconductors & related devices | 971.7K | 83.42% | 83.42% | $3.63B | Nov 14, 2025 | ▼ 3.4K |
UBS GROUP AG semiconductors & related devices | 647.2K | 55.56% | 55.56% | $2.42B | Nov 13, 2025 | ▼ 92.5K |
MILLENNIUM MANAGEMENT LLC semiconductors & related devices | 491.5K | 42.20% | 42.20% | $1.84B | Nov 14, 2025 | ▲ 433.5K |
CITADEL ADVISORS LLC semiconductors & related devices | 366.5K | 31.46% | 31.46% | $1.37B | Nov 14, 2025 | ▲ 247.3K |
SUSQUEHANNA INTERNATIONAL GROUP, LLP semiconductors & related devices | 342.1K | 29.37% | 29.37% | $1.28B | Nov 14, 2025 | ▼ 548.7K |
VIDENT ADVISORY, LLC semiconductors & related devices | 264.1K | 22.67% | 22.67% | $987.79M | Nov 14, 2025 | NEW |
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
20
Increased
+9.62M shares18
New Positions
first time holders8
Decreased
−1.32M shares0
Sold Out
fully exitedNet shares change (top 50)
+8.30M
+9.62M / −1.32M
Net new holders
+30
18 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
LAES insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
27
Sell transactions
0.22
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 |
|---|---|---|---|---|---|---|---|
Moreira Carlos Chief Executive Officer | Jun 5, 2026 | Sale | 300 | $3.51 | $1.1K | 696.2K | Form 4 ↗ |
O'Hara John Charles Chief Financial Officer | Jun 5, 2026 | Sale | 143 | $3.51 | $501.93 | 250.4K | Form 4 ↗ |
Moreira Carlos Chief Executive Officer | May 27, 2026 | Sale | 4,139 | $3.50 | $14.5K | 723.5K | Form 4 ↗ |
Moreira Carlos Chief Executive Officer | May 29, 2026 | Sale | 10,000 | $3.51 | $35.1K | 713.5K | Form 4 ↗ |
O'Hara John Charles Chief Financial Officer | May 27, 2026 | Sale | 4,689 | $3.50 | $16.4K | 276.2K | Form 4 ↗ |
O'Hara John Charles Chief Financial Officer | May 29, 2026 | Sale | 10,000 | $3.51 | $35.1K | 266.2K | Form 4 ↗ |
Buonanno Franck Jean Vice-President, Global Sales | May 14, 2026 | Sale | 20,000 | $2.90 | $58.0K | 10.0K | Form 4 ↗ |
Enguent Jean-Pierre Vice President, R&DSS | May 6, 2026 | Sale | 15,000 | $3.13 | $47.0K | 0 | Form 4 ↗ |
O'Hara John Charles Chief Financial Officer | Apr 22, 2026 | Sale | 10,000 | $3.06 | $30.6K | 296.1K | Form 4 ↗ |
O'Hara John Charles Chief Financial Officer | Apr 23, 2026 | Sale | 10,000 | $2.88 | $28.8K | 286.1K | 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
SEALSQ Corp (LAES) is primarily owned by institutional investors, who hold approximately 3.8% of total shares outstanding. Company insiders own approximately 20.38%, while retail and public investors account for the remaining 75.82%.
The largest institutional shareholder of SEALSQ Corp is SUSQUEHANNA INTERNATIONAL GROUP, LLP, holding approximately 6.12 million shares — equal to 5.25% of outstanding shares — as of September 30, 2025.
A total of 81 institutional investors currently hold LAES stock, with a combined institutional value of approximately $20,881,151 as of the most recent 13F filing period.
Frequently asked questions
LAES ownershipSEALSQ Corp (LAES) is primarily owned by institutional investors, who hold approximately 3.8% of shares. The largest shareholder is SUSQUEHANNA INTERNATIONAL GROUP, LLP with a 5.25% stake. Company insiders hold 20.38%. Data sourced from SEC Form 13F as of September 30, 2025.