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 Mar 31, 2025
Ownership Breakdown
57
Institutional Holders
▼ 2 vs Q4
$45.19M
Total Inst. Value
▼ $7.42M vs Q4
3.04M
Shares Outstanding
freeFloat 91.02%
1.02M
13F Shares Held
▼ 71,194 vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
GAMCO INVESTORS, INC. ET AL electronic components, nec | 148.3K | 5.22% | 5.22% | $6.61B | May 14, 2025 | ▼ 6.4K |
VANGUARD GROUP INC electronic components, nec | 106.1K | 3.74% | 3.74% | $4.73B | May 9, 2025 | ▲ 8.5K |
BARD ASSOCIATES INC electronic components, nec | 88.6K | 3.12% | 3.12% | $3.95B | May 12, 2025 | ▼ 350 |
NEXT CENTURY GROWTH INVESTORS LLC electronic components, nec | 70.6K | 2.48% | 2.48% | $3.14B | May 14, 2025 | ▼ 23.5K |
PALISADES INVESTMENT PARTNERS, LLC electronic components, nec | 63.0K | 2.22% | 2.22% | $2.81B | Apr 30, 2025 | ▲ 20 |
MARSHALL WACE, LLP electronic components, nec | 38.3K | 1.35% | 1.35% | $1.71B | May 15, 2025 | ▲ 25.0K |
HERALD INVESTMENT MANAGEMENT LTD electronic components, nec | 35.0K | 1.23% | 1.23% | $1.53B | May 12, 2025 | NEW |
ADVISOR GROUP HOLDINGS, INC. electronic components, nec | 33.6K | 1.18% | 1.18% | $1.50B | May 12, 2025 | ▲ 4.4K |
RENAISSANCE TECHNOLOGIES LLC electronic components, nec | 32.6K | 1.15% | 1.15% | $1.45B | May 14, 2025 | ▼ 7.2K |
DIMENSIONAL FUND ADVISORS LP electronic components, nec | 32.4K | 1.14% | 1.14% | $1.44B | May 13, 2025 | ▼ 6.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
17
Increased
+68.9K shares9
New Positions
first time holders20
Decreased
−131.2K shares0
Sold Out
fully exitedNet shares change (top 50)
62.3K
+68.9K / −131.2K
Net new holders
+6
9 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 33.4% of total shares outstanding. Company insiders own approximately 8.98%, while retail and public investors account for the remaining 57.60%.
The largest institutional shareholder of M-tron Industries, Inc. is GAMCO INVESTORS, INC. ET AL, holding approximately 148,300 shares — equal to 5.22% of outstanding shares — as of March 31, 2025.
A total of 57 institutional investors currently hold MPTI stock, with a combined institutional value of approximately $45,185,560 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 33.4% of shares. The largest shareholder is GAMCO INVESTORS, INC. ET AL with a 5.22% stake. Company insiders hold 8.98%. Data sourced from SEC Form 13F as of March 31, 2025.