M-tron Industries, Inc.
M-tron Industries, Inc. (MPTI) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MPTI · as of Sep 30, 2025
Ownership Breakdown
85
Institutional Holders
▲ 16 vs Q2
$78.71M
Total Inst. Value
▲ $22.78M vs Q2
3.04M
Shares Outstanding
freeFloat 91.02%
1.43M
13F Shares Held
▲ 94,923 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
MPTI largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
GAMCO INVESTORS, INC. ET AL electronic components, nec | 141.5K | 4.96% | 4.96% | $7.85B | Nov 12, 2025 | ▼ 3.0K |
BLACKROCK, INC. electronic components, nec | 132.0K | 4.63% | 4.63% | $7.32B | Nov 12, 2025 | ▲ 13.5K |
VANGUARD GROUP INC electronic components, nec | 126.6K | 4.44% | 4.44% | $7.02B | Nov 7, 2025 | ▲ 2.1K |
ARCHON CAPITAL MANAGEMENT LLC electronic components, nec | 118.2K | 4.14% | 4.14% | $6.56B | Nov 14, 2025 | ▲ 17.6K |
NEXT CENTURY GROWTH INVESTORS LLC electronic components, nec | 87.0K | 3.05% | 3.05% | $4.83B | Nov 14, 2025 | ▲ 18.3K |
BARD ASSOCIATES INC electronic components, nec | 87.0K | 3.05% | 3.05% | $4.83B | Nov 14, 2025 | ▼ 50 |
PALISADES INVESTMENT PARTNERS, LLC electronic components, nec | 62.4K | 2.19% | 2.19% | $3.46B | Oct 30, 2025 | ▲ 271 |
GEODE CAPITAL MANAGEMENT, LLC electronic components, nec | 55.7K | 1.95% | 1.95% | $3.09B | Nov 12, 2025 | ▲ 1.0K |
HERALD INVESTMENT MANAGEMENT LTD electronic components, nec | 55.0K | 1.93% | 1.93% | $3.04B | Nov 7, 2025 | NEW |
RENAISSANCE TECHNOLOGIES LLC electronic components, nec | 45.1K | 1.58% | 1.58% | $2.50B | Nov 13, 2025 | ▲ 6.5K |
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
23
Increased
+114.0K shares10
New Positions
first time holders14
Decreased
−104.4K shares0
Sold Out
fully exitedNet shares change (top 50)
+9.7K
+114.0K / −104.4K
Net new holders
+19
10 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
MPTI 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.
18
Buy transactions
11
Sell transactions
1.64
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 |
|---|---|---|---|---|---|---|---|
Drafts William Arnold President | May 4, 2026 | Sale | 361 | $66.78 | $24.1K | 13.8K | Form 4 ↗ |
Pforr Cameron CEO and CFO | May 4, 2026 | Sale | 840 | $66.78 | $56.1K | 26.8K | Form 4 ↗ |
Biles Linda M Executive VP - Finance | May 4, 2026 | Sale | 306 | $66.78 | $20.4K | 28.4K | Form 4 ↗ |
Arteaga Ivan director | Apr 27, 2026 | X-InTheMoney | 24 | $59.00 | $1.4K | 1.3K | Form 4 ↗ |
Arteaga Ivan director | Apr 10, 2026 | X-InTheMoney | 174 | $59.00 | $10.3K | 1.3K | Form 4 ↗ |
Arteaga Ivan director | Apr 13, 2026 | X-InTheMoney | 870 | $59.00 | $51.3K | 245 | Form 4 ↗ |
Biles Linda M Executive VP - Finance | Apr 9, 2026 | Sale | 24,643 | $59.00 | $1.45M | 2.7K | Form 4 ↗ |
Biles Linda M Executive VP - Finance | Apr 14, 2026 | Sale | 2,700 | $59.00 | $159.3K | 0 | Form 4 ↗ |
Drafts William Arnold President | Apr 6, 2026 | Sale | 3,600 | $59.00 | $212.4K | 8.1K | Form 4 ↗ |
Drafts William Arnold President | Apr 13, 2026 | Sale | 7,609 | $59.00 | $448.9K | 540 | 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
M-tron Industries, Inc. (MPTI) is primarily owned by institutional investors, who hold approximately 47.0% of total shares outstanding. Company insiders own approximately 8.98%, while retail and public investors account for the remaining 44.05%.
The largest institutional shareholder of M-tron Industries, Inc. is GAMCO INVESTORS, INC. ET AL, holding approximately 141,500 shares — equal to 4.96% of outstanding shares — as of September 30, 2025.
A total of 85 institutional investors currently hold MPTI stock, with a combined institutional value of approximately $78,705,437 as of the most recent 13F filing period.
Frequently asked questions
MPTI ownershipM-tron Industries, Inc. (MPTI) is primarily owned by institutional investors, who hold approximately 47.0% of shares. The largest shareholder is GAMCO INVESTORS, INC. ET AL with a 4.96% stake. Company insiders hold 8.98%. Data sourced from SEC Form 13F as of September 30, 2025.