45 institutions reported holding $18.4M of COMPX INTL INC (CIX) in SEC 13F filings for 2026-03-31. Largest institutional holders: DIMENSIONAL FUND ADVISORS LP ($4.2M), ROYCE & ASSOCIATES LP ($3.9M), BlackRock, Inc. ($2.5M), RENAISSANCE TECHNOLOGIES LLC ($2.5M), VANGUARD CAPITAL MANAGEMENT LLC ($1.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | DIMENSIONAL FUND ADVISORS LP | $4.2M | 179,409 | Trimmed |
| 2 | ROYCE & ASSOCIATES LP | $3.9M | 166,074 | Hold |
| 3 | BlackRock, Inc. | $2.5M | 107,504 | Added |
| 4 | RENAISSANCE TECHNOLOGIES LLC | $2.5M | 106,949 | Trimmed |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $1.8M | 78,220 | New |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | $808,005 | 34,585 | Trimmed |
| 7 | STATE STREET CORP | $714,816 | 30,600 | Trimmed |
| 8 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $552,861 | 23,667 | Hold |
| 9 | NORTHERN TRUST CORP | $396,816 | 16,987 | Trimmed |
| 10 | VANGUARD FIDUCIARY TRUST CO | $248,550 | 10,640 | New |
| 11 | VANGUARD PORTFOLIO MANAGEMENT LLC | $206,339 | 8,833 | New |
| 12 | BARCLAYS PLC | $138,549 | 5,931 | Trimmed |
| 13 | JPMORGAN CHASE & CO | $114,997 | 4,906 | Trimmed |
| 14 | MORGAN STANLEY | $101,943 | 4,364 | Trimmed |
| 15 | RHUMBLINE ADVISERS | $61,286 | 2,624 | Trimmed |
| 16 | DEUTSCHE BANK AG\ | $33,498 | 1,434 | Hold |
| 17 | Royal Bank of Canada | $27,000 | 1,151 | Added |
| 18 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $17,917 | 767 | Added |
| 19 | FMR LLC | $17,343 | 742 | Trimmed |
| 20 | Tower Research Capital LLC (TRC) | $17,216 | 737 | Added |
| 21 | WELLS FARGO & COMPANY/MN | $13,242 | 567 | Trimmed |
| 22 | BNP PARIBAS FINANCIAL MARKETS | $7,989 | 342 | Added |
| 23 | Russell Investments Group, Ltd. | $7,685 | 329 | Trimmed |
| 24 | MAI Capital Management | $7,055 | 302 | Hold |
| 25 | UBS Group AG | $6,518 | 279 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31