Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MPX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | DIMENSIONAL FUND ADVISORS LP | 768K | $5.6M | +2.8% | 2.242% | 0.00% |
| 2 | BlackRock, Inc. | 626K | $4.5M | -0.9% | 1.827% | 0.00% |
| 3 | GAMCO INVESTORS, INC. ET AL | 509K | $3.7M | +1.8% | 1.486% | 0.04% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 450K | $3.3M | β | 1.315% | 0.00% |
| 5 | DEPRINCE RACE & ZOLLO INC | 446K | $3.2M | +7.2% | 1.304% | 0.06% |
| 6 | Russell Investments Group, Ltd. | 388K | $2.8M | +25.3% | 1.132% | 0.00% |
| 7 | De Lisle Partners LLP | 364K | $2.6M | 0.0% | 1.062% | 0.32% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 261K | $1.9M | +4.3% | 0.761% | 0.00% |
| 9 | GABELLI FUNDS LLC | 233K | $1.7M | 0.0% | 0.679% | 0.01% |
| 10 | Teton Advisors, LLC | 223K | $1.6M | -0.4% | 0.651% | 1.14% |
| 11 | STATE STREET CORP | 181K | $1.3M | -1.0% | 0.530% | 0.00% |
| 12 | Bank of New York Mellon Corp | 159K | $1.2M | +9.9% | 0.464% | 0.00% |
| 13 | K2 PRINCIPAL FUND, L.P. | 120K | $874K | β | 0.351% | 0.10% |
| 14 | NORTHERN TRUST CORP | 86K | $624K | -5.4% | 0.251% | 0.00% |
| 15 | HANOVER ADVISORS INC | 78K | $568K | 0.0% | 0.228% | 0.23% |
| 16 | VANGUARD FIDUCIARY TRUST CO | 72K | $523K | β | 0.210% | 0.00% |
| 17 | RENAISSANCE TECHNOLOGIES LLC | 66K | $480K | -2.6% | 0.193% | 0.00% |
| 18 | ABC ARBITRAGE SA | 62K | $451K | β | 0.181% | 0.06% |
| 19 | AMERICAN CENTURY COMPANIES INC | 54K | $396K | -28.3% | 0.159% | 0.00% |
| 20 | TRUIST FINANCIAL CORP | 54K | $393K | 0.0% | 0.158% | 0.00% |
| 21 | VANGUARD PORTFOLIO MANAGEMENT LLC | 52K | $377K | β | 0.152% | 0.00% |
| 22 | GOLDMAN SACHS GROUP INC | 43K | $315K | -1.7% | 0.127% | 0.00% |
| 23 | MORGAN STANLEY | 31K | $223K | -68.2% | 0.090% | 0.00% |
| 24 | Pinnacle Financial Partners, Inc. | 31K | $222K | 0.0% | 0.089% | 0.00% |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 26K | $187K | -0.1% | 0.075% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in MPX β a direct measure of their conviction.
Filings activity in MPX during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new MPX position in Q1 2026
Institutions that fully closed their MPX position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 73 | +1.4% | 14.41% | 2.25 pp | $40M | 14% |
| Q4 2025 | 72 | +4.3% | 16.66% | 0.14 pp | $47M | 0.8% |
| Q3 2025 | 69 | 2.8% | 16.80% | +0.93 pp | $47M | +5.8% |
| Q2 2025 | 71 | +7.6% | 15.87% | +0.34 pp | $44M | +2.2% |
| Q1 2025 | 66 | 2.9% | 15.53% | 1.10 pp | $43M | 6.6% |
| Q4 2024 | 68 | +4.6% | 16.63% | 0.98 pp | $47M | 5.6% |
| Q3 2024 | 65 | 3.0% | 17.61% | +0.31 pp | $49M | +1.8% |
| Q2 2024 | 67 | β | 17.30% | β | $48M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MPX stock.
Based on Q1 2026 13F filings, institutional ownership of Marine Products Corporation stands at 14.4%, held across 73 reporting institutions.
DIMENSIONAL FUND ADVISORS LP is the largest reported institutional holder of MPX, with approximately 767,510 shares worth $0.01B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of MPX, including RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for MPX is 40 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
14 institutions opened new positions in MPX during Q1 2026, while 13 fully exited. 7 added to existing positions and 50 trimmed.
MPX institutional ownership fell by 2.25 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 76.8% of all reported 13F value in MPX, and the top 25 account for 96.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Marine Products Corporation (MPX) Institutional Ownership