MPTI · M-tron Industries, Inc. · Shareholders & Ownership

$69.39 +1.64 (+2.42%) At close · Oct 21

Russell 2000 member Rebalance outlook locked

Market Cap

$301.60M

4.35M

Volume · Oct 21 121K Avg daily vol (3M) 138.1K

Every disclosed holder of MPTI in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns MPTI

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	123	2,990,139	68.79%	Yes
Insiders (Forms 3, 4, 5)	11	426,562	9.81%	Yes
13D/G-only blocks	0	0	0.00%	Yes
Remaining	—	929,775	21.39%	Rest
Registered funds (N-PORT, not summed)	126	981,655	22.59%	No

Shares outstanding: 4,346,476, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of MPTI

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	GABELLI MARIO J Insider CIK 1185533 · Nov 19, 2024 10% Owner, issuer-wide	281,371	6.47%	-3,500	Nov 19, 2024	10% Owner, issuer-wide
2	T. Rowe Price Investment Management, Inc. 13F CIK 1897612 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	255,506	5.88%	+255,506	Jun 30, 2026	carried, not yet filed for the newest quarter
2.1	T. Rowe Price Investment Management, Inc. 13G CIK 1897612 · Investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	255,506	5.88%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	252,972	5.82%	+111,224	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	250,574	5.77%	-32,056	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3.2	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	109,108	2.51%	+45,467	Jun 30, 2026	iShares Trust, not summed
3.3	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	39,397	0.91%	+17,874	Jun 30, 2026	iShares Trust, not summed
3.4	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	14,057	0.32%	+7,214	Jun 30, 2026	iShares Trust, not summed
3.5	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	7,818	0.18%	+3,565	Jun 30, 2026	Quantitative Master Series LLC, not summed
4	GAMCO INVESTORS, INC. ET AL 13F CIK 807249 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	201,280	4.63%	+32,880	Jun 30, 2026	carried, not yet filed for the newest quarter
5	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	173,148	3.98%	+56,380	Jun 30, 2026	carried, not yet filed for the newest quarter
6	ROYCE & ASSOCIATES LP 13F CIK 906304 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	156,595	3.60%	+148,271	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	Royce Small-Cap Fund Fund S000009507 · Registered fund · Jun 30, 2026 ROYCE FUND, not summed	30,485	0.70%	—	Jun 30, 2026	ROYCE FUND, not summed
6.2	Royce Micro-Cap Fund Fund S000009506 · Registered fund · Jun 30, 2026 ROYCE FUND, not summed	24,229	0.56%	—	Jun 30, 2026	ROYCE FUND, not summed
6.3	Royce Capital Fund - Micro-Cap Portfolio Fund S000009496 · Registered fund · Jun 30, 2026 ROYCE CAPITAL FUND, not summed	7,912	0.18%	—	Jun 30, 2026	ROYCE CAPITAL FUND, not summed
7	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	132,465	3.05%	+70,002	Jun 30, 2026	carried, not yet filed for the newest quarter
8	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	124,695	2.87%	+46,532	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
9	NEXT CENTURY GROWTH INVESTORS LLC 13F CIK 1134007 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	124,173	2.86%	+15,953	Jun 30, 2026	carried, not yet filed for the newest quarter
10	WASATCH ADVISORS LP 13F CIK 814133 · Registered investment adviser · Sep 30, 2026	107,671	2.48%	+107,671	Sep 30, 2026
11	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	100,646	2.32%	+36,715	Jun 30, 2026	carried, not yet filed for the newest quarter
12	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	96,005	2.21%	-784	Jun 30, 2026	carried, not yet filed for the newest quarter
13	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	82,493	1.90%	+38,210	Jun 30, 2026	carried, not yet filed for the newest quarter
13.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	1,180	0.03%	+280	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
13.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	106	0.00%	+22	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
14	Palisades Investment Partners, LLC 13F CIK 1427373 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	82,296	1.89%	+1,269	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Congruence Capital, LLC 13F CIK 2085569 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	66,701	1.53%	+24,445	Jun 30, 2026	carried, not yet filed for the newest quarter
16	ADVISORY RESEARCH INC 13F CIK 902584 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	59,011	1.36%	+8,468	Jun 30, 2026	carried, not yet filed for the newest quarter
17	HERALD INVESTMENT MANAGEMENT Ltd 13F CIK 1512022 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	58,500	1.35%	+3,500	Jun 30, 2026	carried, not yet filed for the newest quarter
18	Grandeur Peak Global Advisors, LLC 13F CIK 1569137 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	56,681	1.30%	+5,833	Jun 30, 2026	carried, not yet filed for the newest quarter
18.1	GRANDEUR PEAK GLOBAL OPPORTUNITIES FUND Fund S000080371 · Registered fund · Jul 31, 2026 Grandeur Peak Global Trust, not summed	23,627	0.54%	+1,225	Jul 31, 2026	Grandeur Peak Global Trust, not summed
18.2	GRANDEUR PEAK GLOBAL MICROCAP FUND Fund S000080370 · Registered fund · Jul 31, 2026 Grandeur Peak Global Trust, not summed	9,609	0.22%	+1,677	Jul 31, 2026	Grandeur Peak Global Trust, not summed
18.3	GRANDEUR PEAK GLOBAL REACH FUND Fund S000080372 · Registered fund · Jul 31, 2026 Grandeur Peak Global Trust, not summed	7,427	0.17%	-6,266	Jul 31, 2026	Grandeur Peak Global Trust, not summed
18.4	GRANDEUR PEAK US STALWARTS FUND Fund S000080367 · Registered fund · Jul 31, 2026 Grandeur Peak Global Trust, not summed	4,970	0.11%	-2,662	Jul 31, 2026	Grandeur Peak Global Trust, not summed
19	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	48,493	1.12%	+43,077	Jun 30, 2026	carried, not yet filed for the newest quarter
20	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	47,681	1.10%	+2,693	Jun 30, 2026	carried, not yet filed for the newest quarter
20.1	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	10,936	0.25%	-861	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
20.2	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	10,281	0.24%	-180	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
20.3	Dimensional U.S. Small Cap ETF Fund S000070906 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	9,276	0.21%	+819	Jul 31, 2026	Dimensional ETF Trust, not summed
20.4	U.S. CORE EQUITY 2 PORTFOLIO Fund S000000980 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	3,320	0.08%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
20.5	U.S. Small Cap Growth Portfolio Fund S000039439 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	1,045	0.02%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
21	HUNTER ASSOCIATES INVESTMENT MANAGEMENT LLC 13F CIK 1380137 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	46,804	1.08%	+46,804	Jun 30, 2026	carried, not yet filed for the newest quarter
22	GABELLI MARC Insider CIK 1233348 · Apr 20, 2026 Director, issuer-wide	45,840	1.05%	+3,276	Apr 20, 2026	Director, issuer-wide
22.1	GABELLI MARC 13D CIK 1233348 · Unknown · Jan 5, 2024 not summed	68,321	1.57%	-820	Jan 5, 2024	not summed
23	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	45,214	1.04%	+9,522	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
24	BARD ASSOCIATES INC 13F CIK 1105907 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	44,578	1.03%	-40,940	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Aristides Capital LLC 13F CIK 1595521 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	41,209	0.95%	-24,464	Jun 30, 2026	carried, not yet filed for the newest quarter
26	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	39,832	0.92%	+11,399	Jun 30, 2026	carried, not yet filed for the newest quarter
26.1	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	2,214	0.05%	-96	Jun 30, 2026	Northern Funds, not summed
26.2	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	2,147	0.05%	+864	Jun 30, 2026	Northern Funds, not summed
27	Potrero Capital Research LLC 13F CIK 1536630 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	38,161	0.88%	+6,360	Jun 30, 2026	carried, not yet filed for the newest quarter
28	ROYCE SMALL-CAP TRUST, INC. Fund · Registered fund · Jun 30, 2026 ROYCE SMALL-CAP TRUST, INC., not summed	35,876	0.83%	—	Jun 30, 2026	ROYCE SMALL-CAP TRUST, INC., not summed
28.1	ROYCE MICRO-CAP TRUST, INC. Fund · Registered fund · Jun 30, 2026 ROYCE MICRO-CAP TRUST, INC., not summed	56,228	1.29%	—	Jun 30, 2026	ROYCE MICRO-CAP TRUST, INC., not summed
29	NEW YORK STATE COMMON RETIREMENT FUND 13F CIK 810265 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	31,660	0.73%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
30	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	30,954	0.71%	+11,147	Jun 30, 2026	carried, not yet filed for the newest quarter
31	BNP PARIBAS ARBITRAGE, SA 13F CIK 1166588 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	30,583	0.70%	+8,155	Jun 30, 2026	carried, not yet filed for the newest quarter
32	Biles Linda M Insider CIK 1823023 · Aug 11, 2026 EVP Finance, issuer-wide	28,723	0.66%	+347	Aug 11, 2026	EVP Finance, issuer-wide
33	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	27,180	0.63%	+5,583	Jun 30, 2026	carried, not yet filed for the newest quarter
34	Pforr Cameron Insider CIK 1945437 · May 4, 2026 CEO and CFO, issuer-wide	26,806	0.62%	-1,380	May 4, 2026	CEO and CFO, issuer-wide
35	MCINTYRE FREEDMAN & FLYNN INVESTMENT ADVISERS INC 13F CIK 1015877 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	25,800	0.59%	+4,300	Jun 30, 2026	carried, not yet filed for the newest quarter
36	Verition Fund Management LLC 13F CIK 1454027 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	25,000	0.58%	+25,000	Jun 30, 2026	carried, not yet filed for the newest quarter
37	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	24,493	0.56%	+3,177	Jun 30, 2026	carried, not yet filed for the newest quarter
38	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	21,358	0.49%	+4,239	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Invesco Ltd. 13F CIK 914208 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	18,958	0.44%	+18,958	Jun 30, 2026	carried, not yet filed for the newest quarter
40	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	18,769	0.43%	+13,683	Jun 30, 2026	carried, not yet filed for the newest quarter
40.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	18	0.00%	+6	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
41	ACADIAN ASSET MANAGEMENT LLC 13F CIK 916542 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	17,258	0.40%	+15,048	Jun 30, 2026	carried, not yet filed for the newest quarter
42	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	17,143	0.39%	+6,069	Jun 30, 2026	carried, not yet filed for the newest quarter
43	AMERIPRISE FINANCIAL INC 13F CIK 820027 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	17,098	0.39%	-3,033	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Columbia Research Enhanced Small Cap ETF Fund S000095313 · Registered fund · Jun 30, 2026 Columbia ETF Trust I, not summed	8	0.00%	—	Jun 30, 2026	Columbia ETF Trust I, not summed
44	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	16,863	0.39%	+4,765	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
45	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	16,715	0.38%	+6,638	Jun 30, 2026	carried, not yet filed for the newest quarter
45.1	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	5,560	0.13%	+1,743	Jul 31, 2026	TIAA-CREF Funds, not summed
45.2	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	4,766	0.11%	-1,914	Jun 30, 2026	College Retirement Equities Fund, not summed
45.3	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	259	0.01%	+43	Jun 30, 2026	TIAA Separate Account VA-1, not summed
46	Apis Capital Advisors, LLC 13F CIK 1386892 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	16,000	0.37%	+4,000	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Russell Investments Group, Ltd. 13F CIK 1692234 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	14,667	0.34%	+373	Jun 30, 2026	carried, not yet filed for the newest quarter
47.1	U.S. Small Cap Equity Fund Fund S000006864 · Registered fund · Jun 30, 2026 RUSSELL INVESTMENT FUNDS, not summed	1,240	0.03%	0	Jun 30, 2026	RUSSELL INVESTMENT FUNDS, not summed
48	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	14,548	0.33%	+3,917	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Informed Momentum Co LLC 13F CIK 1510989 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	14,516	0.33%	+14,516	Jun 30, 2026	carried, not yet filed for the newest quarter
50	ExodusPoint Capital Management, LP 13F CIK 1736225 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	14,110	0.32%	-7,772	Jun 30, 2026	carried, not yet filed for the newest quarter

12 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 195 holders

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Key facts CIK 1902314 CUSIP 55380K109 13F (30d) 14 filings 14 filers Visit website Investor relations