M-tron Industries, Inc. (MPTI) ownership: Top institutional holder: GAMCO INVESTORS, INC. ET AL ($11.26M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| GAMCO INVESTORS, INC. ET AL | 168400.00 | $11.26M | 2026-03-31 |
| BlackRock, Inc. | 141748.00 | $9.48M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 116768.00 | $7.81M | 2026-03-31 |
| VANGUARD GROUP INC | 143581.00 | $7.64M | 2025-12-31 |
| NEXT CENTURY GROWTH INVESTORS LLC | 108220.00 | $7.23M | 2026-03-31 |
| RENAISSANCE TECHNOLOGIES LLC | 96789.00 | $6.47M | 2026-03-31 |
| BARD ASSOCIATES INC | 85518.00 | $5.72M | 2026-03-31 |
| Palisades Investment Partners, LLC | 81027.00 | $5.42M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-04 | |
| Sell | null | 2026-05-04 | |
| Sell | null | 2026-05-04 | |
| Sell | null | 2026-04-29 | |
| Sell | null | 2026-04-29 | |
| Sell | null | 2026-04-28 | |
| Sell | null | 2026-04-28 | |
| Sell | null | 2026-04-27 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.