Mars Acquisition Corp.
Mars Acquisition Corp. (MARX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MARX · as of Dec 31, 2024
Ownership Breakdown
8
Institutional Holders
▼ 7 vs Q3
$10.69M
Total Inst. Value
▼ $10.53M vs Q3
4.47M
Shares Outstanding
freeFloat 28.78%
1.05M
13F Shares Held
▼ 878,582 vs Q3
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
MARX largest shareholders · institutional ownership
Q4 2024 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
RIVERNORTH CAPITAL MANAGEMENT, LLC blank checks | 400.0K | 16.72% | 16.72% | $3.74B | Feb 14, 2025 | — held |
BERKLEY W R CORP blank checks | 220.3K | 9.21% | 9.21% | $2.45B | Feb 14, 2025 | — held |
AQR ARBITRAGE LLC blank checks | 195.0K | 8.15% | 8.15% | $2.17B | Feb 14, 2025 | — held |
HUDSON BAY CAPITAL MANAGEMENT LP blank checks | 100.0K | 4.18% | 4.18% | $1.10B | Feb 14, 2025 | — held |
CLEAR STREET LLC blank checks | 98.1K | 4.10% | 4.10% | $917.48M | May 15, 2025 | ▲ 90.8K |
CITADEL ADVISORS LLC blank checks | 16.6K | 69.55% | 69.55% | $163.54M | Feb 14, 2025 | NEW |
FLOW TRADERS U.S. LLC blank checks | 15.4K | 64.34% | 64.34% | $144.00M | Feb 14, 2025 | ▲ 4.0K |
TOWER RESEARCH CAPITAL LLC (TRC) blank checks | 88 | 0.37% | 0.37% | $823,000 | Feb 13, 2025 | ▼ 14 |
FIR TREE CAPITAL MANAGEMENT LP blank checks | 0 | 0.00% | 0.00% | $0 | Feb 14, 2025 | EXIT |
MIZUHO SECURITIES USA LLC blank checks | 0 | 0.00% | 0.00% | $0 | Feb 11, 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
Q4 2024 vs prior quarter
Q4 2024
2
Increased
+94.8K shares1
New Positions
first time holders1
Decreased
−14 shares7
Sold Out
fully exitedNet shares change (top 50)
+94.8K
+94.8K / −14
Net new holders
-5
1 new / 7 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MARX insider trading · insider activity
Source: SEC Form 4
0
Buy transactions
6
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 |
|---|---|---|---|---|---|---|---|
Huang Shanchun 10 percent owner | Jan 31, 2024 | Award | 518,008 | — | — | 518.0K | 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
Mars Acquisition Corp. (MARX) is primarily owned by institutional investors, who hold approximately 23.4% of total shares outstanding. Company insiders own approximately 71.22%, while retail and public investors account for the remaining 5.40%.
The largest institutional shareholder of Mars Acquisition Corp. is RIVERNORTH CAPITAL MANAGEMENT, LLC, holding approximately 400,000 shares — equal to 16.72% of outstanding shares — as of December 31, 2024.
A total of 8 institutional investors currently hold MARX stock, with a combined institutional value of approximately $10,685,170 as of the most recent 13F filing period.
Frequently asked questions
MARX ownershipMars Acquisition Corp. (MARX) is primarily owned by institutional investors, who hold approximately 23.4% of shares. The largest shareholder is RIVERNORTH CAPITAL MANAGEMENT, LLC with a 16.72% stake. Company insiders hold 71.22%. Data sourced from SEC Form 13F as of December 31, 2024.