MARINE PRODUCTS CORP (MPX) Top Institutional Shareholders
MARINE PRODUCTS CORP (MPX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $40.36M in MPX holdings during the latest filing period.
Dimensional Fund Advisors Lp is currently the largest disclosed institutional shareholder of MPX tracked by InsiderSet, reporting ownership valued at approximately $5.58M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $6.32M, representing an estimated gain of +13.20% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 77% of the total disclosed MPX value among the investors covered in this analysis. Major shareholders include Dimensional Fund Advisors Lp, Blackrock, Inc., Gamco Investors, Inc. Et Al, and several other long-term asset managers with concentrated positions in MARINE PRODUCTS CORP (MPX).
This page ranks the largest institutional MPX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
72
Total Reported Value
$40.36M
Largest Holder
Dimensional Fund Advisors Lp
Largest Position
$5.58M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
85
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Dimensional Fund Advisors Lp | 0.00% | 767,510 | $5,579,846 | $6,316,607 | +$736,761 | +13.20% | |
| Blackrock, Inc. | 0.00% | 625,523 | $4,547,552 | $5,148,054 | +$600,502 | +13.20% | |
| Gamco Investors, Inc. Et Al | 0.04% | 508,571 | $3,697,311 | $4,185,539 | +$488,228 | +13.20% | |
| Vanguard Capital Management Llc | 0.00% | 450,268 | $3,273,448 | $3,705,706 | +$432,258 | +13.20% | |
| Deprince Race & Zollo Inc | 0.06% | 446,447 | $3,245,670 | $3,674,259 | +$428,589 | +13.20% | |
| Russell Investments Group, Ltd. | 0.00% | 387,577 | $2,817,686 | $3,189,759 | +$372,073 | +13.20% | |
| De Lisle Partners Llp | 0.32% | 363,696 | $2,639,541 | $2,993,218 | +$353,677 | +13.40% | |
| Geode Capital Management, Llc | 0.00% | 260,637 | $1,895,538 | $2,145,043 | +$249,505 | +13.16% | |
| Gabelli Funds Llc | 0.01% | 232,500 | $1,690,275 | $1,913,475 | +$223,200 | +13.20% | |
| Teton Advisors, Llc | 1.14% | 223,000 | $1,621,210 | $1,835,290 | +$214,080 | +13.20% | |
| State Street Corp | 0.00% | 181,372 | $1,318,574 | $1,492,692 | +$174,118 | +13.20% | |
| Bank Of New York Mellon Corp | 0.00% | 158,818 | $1,154,607 | $1,307,072 | +$152,465 | +13.20% | |
| K2 Principal Fund, L.P. | 0.09% | 120,216 | $873,970 | $989,378 | +$115,408 | +13.20% | |
| Northern Trust Corp | 0.00% | 85,836 | $624,028 | $706,430 | +$82,402 | +13.20% | |
| Hanover Advisors Inc | 0.23% | 78,135 | $568,041 | $643,051 | +$75,010 | +13.21% | |
| Vanguard Fiduciary Trust Co | 0.00% | 71,966 | $523,193 | $592,280 | +$69,087 | +13.20% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 66,002 | $479,835 | $543,196 | +$63,361 | +13.20% |
| Abc Arbitrage Sa | 0.06% | 62,067 | $451,227 | $510,811 | +$59,584 | +13.20% | |
| American Century Companies Inc | 0.00% | 54,435 | $395,742 | $448,000 | +$52,258 | +13.21% | |
| Truist Financial Corp | 0.00% | 54,000 | $392,580 | $444,420 | +$51,840 | +13.20% | |
| Vanguard Portfolio Management Llc | 0.00% | 51,904 | $377,342 | $427,170 | +$49,828 | +13.20% | |
| Goldman Sachs Group Inc | 0.00% | 43,393 | $315,467 | $357,124 | +$41,657 | +13.20% | |
| Morgan Stanley | 0.00% | 30,695 | $223,160 | $252,620 | +$29,460 | +13.20% | |
| Pinnacle Financial Partners, Inc. | 0.00% | 30,565 | $222,208 | $251,550 | +$29,342 | +13.20% | |
| Charles Schwab Investment Management Inc | 0.00% | 25,735 | $187,093 | $211,799 | +$24,706 | +13.21% | |
| Ancora Advisors Llc | 0.00% | 25,207 | $183,255 | $207,454 | +$24,199 | +13.20% | |
| Nuveen, Llc | 0.00% | 19,523 | $141,932 | $160,674 | +$18,742 | +13.21% | |
| Ubs Group Ag | 0.00% | 15,602 | $113,426 | $128,404 | +$14,978 | +13.21% | |
| Wealth Enhancement Advisory Services, Llc | 0.00% | 14,442 | $103,694 | $118,858 | +$15,164 | +14.62% | |
| Alliancebernstein L.P. | 0.00% | 10,440 | $91,454 | $85,921 | -$5,533 | -6.05% | |
| Bank Of America Corp | 0.00% | 12,207 | $88,745 | $100,464 | +$11,719 | +13.20% | |
| Susquehanna International Group, Llp | 0.00% | 12,034 | $87,487 | $99,040 | +$11,553 | +13.21% | |
| Rhumbline Advisers | 0.00% | 10,738 | $78,057 | $88,374 | +$10,317 | +13.22% | |
| Osaic Holdings, Inc. | 0.00% | 6,274 | $45,598 | $51,635 | +$6,037 | +13.24% | |
| Fmr Llc | 0.00% | 4,739 | $34,454 | $39,002 | +$4,548 | +13.20% | |
| Tower Research Capital Llc (Trc) | 0.00% | 4,655 | $33,842 | $38,311 | +$4,469 | +13.20% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.00% | 4,302 | $31,276 | $35,405 | +$4,129 | +13.20% | |
| New York State Common Retirement Fund | 0.00% | 4,171 | $30,323 | $34,327 | +$4,004 | +13.21% | |
| Eversource Wealth Advisors, Llc | 0.00% | 365 | $25,521 | $3,004 | -$22,517 | -88.23% | |
| Wells Fargo & Company/Mn | 0.00% | 3,253 | $23,651 | $26,772 | +$3,121 | +13.20% | |
| Police & Firemen'S Retirement System Of New Jersey | 0.00% | 3,065 | $22,283 | $25,225 | +$2,942 | +13.20% | |
| Vanguard Global Advisers, Llc | 0.00% | 2,990 | $21,737 | $24,608 | +$2,871 | +13.21% | |
| Bnp Paribas Financial Markets | 0.00% | 2,250 | $16,357 | $18,518 | +$2,161 | +13.21% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 2,229 | $16,205 | $18,345 | +$2,140 | +13.20% | |
| Barclays Plc | 0.00% | 2,227 | $16,190 | $18,328 | +$2,138 | +13.21% | |
| Royal Bank Of Canada | 0.00% | 1,026 | $7,000 | $8,444 | +$1,444 | +20.63% | |
| Ameritas Investment Partners, Inc. | 0.00% | 813 | $5,911 | $6,691 | +$780 | +13.20% | |
| Legal & General Group Plc | 0.00% | 681 | $4,951 | $5,605 | +$654 | +13.20% | |
| Pnc Financial Services Group, Inc. | 0.00% | 540 | $3,926 | $4,444 | +$518 | +13.20% | |
| California State Teachers Retirement System | 0.00% | 476 | $3,461 | $3,917 | +$456 | +13.19% |
Frequently asked questions about MPX
Who owns the most MPX stock?
The largest holders of MPX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MARINE PRODUCTS CORP (MPX).
Is MPX widely held by superinvestors?
Many widely followed stocks like MPX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MPX is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.