AMPCO-PITTSBURGH CORP (AP) Institutional Shareholders
AMPCO-PITTSBURGH CORP (AP) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $99.45M in AP holdings during the latest filing period.
Gamco Investors, Inc. Et Al is currently the largest disclosed institutional shareholder of AP tracked by InsiderSet, reporting ownership valued at approximately $21.28M in its June 30, 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 $20.54M, representing an estimated loss of -3.47% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 73% of the total disclosed AP value among the investors covered in this analysis. Major shareholders include Gamco Investors, Inc. Et Al, Gabelli Funds Llc, Blackrock, Inc., and several other long-term asset managers with concentrated positions in AMPCO-PITTSBURGH CORP (AP).
This page ranks the largest institutional AP 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
83
Total Reported Value
$99.45M
Largest Holder
Gamco Investors, Inc. Et Al
Largest Position
$21.28M
Insider Transactions (90d)
2
Latest Filing Quarter
Q2 2026
New Institutional Positions
99
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Gamco Investors, Inc. Et Al | 0.19% | 2,459,829 | $21,277,521 | $20,539,572 | -$737,949 | -3.47% | |
| Gabelli Funds Llc | 0.08% | 1,391,800 | $12,039,070 | $11,621,530 | -$417,540 | -3.47% | |
| Blackrock, Inc. | 0.00% | 982,611 | $8,499,585 | $8,204,802 | -$294,783 | -3.47% | |
| Ameriprise Financial Inc | 0.00% | 905,679 | $7,834,123 | $7,562,420 | -$271,703 | -3.47% | |
| Wells Fargo & Company/Mn | 0.00% | 660,945 | $5,717,170 | $5,518,891 | -$198,279 | -3.47% | |
| Vanguard Capital Management Llc | 0.00% | 604,091 | $5,225,387 | $5,044,160 | -$181,227 | -3.47% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 414,419 | $3,584,724 | $3,460,399 | -$124,325 | -3.47% |
| Geode Capital Management, Llc | 0.00% | 342,836 | $2,966,779 | $2,862,681 | -$104,098 | -3.51% | |
| American Century Companies Inc | 0.00% | 328,848 | $2,844,535 | $2,745,881 | -$98,654 | -3.47% | |
| Dimensional Fund Advisors Lp | 0.00% | 295,444 | $2,555,702 | $2,466,957 | -$88,745 | -3.47% | |
| Meros Investment Management, Lp | 0.66% | 239,910 | $2,075,222 | $2,003,249 | -$71,974 | -3.47% | |
| Susquehanna International Group, Llp | 0.00% | 195,321 | $1,689,527 | $1,630,930 | -$58,597 | -3.47% | |
| Acadian Asset Management Llc | 0.00% | 191,015 | $1,646,000 | $1,594,975 | -$51,025 | -3.10% | |
| O'Shaughnessy Asset Management, Llc | 0.01% | 174,312 | $1,507,799 | $1,455,505 | -$52,294 | -3.47% | |
| State Street Corp | 0.00% | 159,316 | $1,378,083 | $1,330,289 | -$47,794 | -3.47% | |
| Jane Street Group, Llc | 0.00% | 150,371 | $1,300,709 | $1,255,598 | -$45,111 | -3.47% | |
| Huntleigh Advisors, Inc. | 0.17% | 141,172 | $1,221,145 | $1,178,786 | -$42,359 | -3.47% | |
| Ritholtz Wealth Management | 0.02% | 132,943 | $1,149,957 | $1,110,074 | -$39,883 | -3.47% | |
| Teton Advisors, Llc | 0.65% | 130,000 | $1,124,500 | $1,085,500 | -$39,000 | -3.47% | |
| Bridgeway Capital Management, Llc | 0.02% | 125,386 | $1,084,589 | $1,046,973 | -$37,616 | -3.47% | |
| Northern Trust Corp | 0.00% | 121,477 | $1,050,777 | $1,014,333 | -$36,444 | -3.47% | |
| Vanguard Portfolio Management Llc | 0.00% | 112,721 | $975,037 | $941,220 | -$33,817 | -3.47% | |
| Goldman Sachs Group Inc | 0.00% | 100,724 | $871,263 | $841,045 | -$30,218 | -3.47% | |
| Vanguard Fiduciary Trust Co | 0.00% | 92,875 | $803,369 | $775,506 | -$27,863 | -3.47% | |
| Informed Momentum Co Llc | 0.07% | 90,053 | $778,958 | $751,943 | -$27,015 | -3.47% | |
| Marshall Wace, Llp | 0.00% | 80,361 | $695,123 | $671,014 | -$24,109 | -3.47% | |
| Palumbo Wealth Management Llc | 0.14% | 79,185 | $684,951 | $661,195 | -$23,756 | -3.47% | |
| Sei Investments Co | 0.00% | 65,911 | $570,130 | $550,357 | -$19,773 | -3.47% | |
| Panagora Asset Management Inc | 0.00% | 52,441 | $453,615 | $437,882 | -$15,733 | -3.47% | |
| Citadel Advisors Llc | 0.00% | 51,409 | $444,688 | $429,265 | -$15,423 | -3.47% | |
| Empowered Funds, Llc | 0.00% | 50,286 | $434,974 | $419,888 | -$15,086 | -3.47% | |
| Charles Schwab Investment Management Inc | 0.00% | 39,373 | $340,576 | $328,765 | -$11,811 | -3.47% | |
| Bank Of New York Mellon Corp | 0.00% | 33,984 | $293,964 | $283,766 | -$10,198 | -3.47% | |
| Qube Research & Technologies Ltd | 0.00% | 32,230 | $278,790 | $269,121 | -$9,670 | -3.47% | |
| Ubs Group Ag | 0.00% | 32,154 | $278,132 | $268,486 | -$9,646 | -3.47% | |
| Dynamic Technology Lab Private Ltd | 0.06% | 30,373 | $263,000 | $253,615 | -$9,385 | -3.57% | |
| Occudo Quantitative Strategies Lp | 0.01% | 24,936 | $215,696 | $208,216 | -$7,480 | -3.47% | |
| Xtx Topco Ltd | 0.00% | 23,995 | $207,557 | $200,358 | -$7,199 | -3.47% | |
| Central Pacific Bank - Trust Division | 0.02% | 22,401 | $193,769 | $187,048 | -$6,721 | -3.47% | |
| Gsa Capital Partners Llp | 0.01% | 21,641 | $187,000 | $180,702 | -$6,298 | -3.37% | |
| Nuveen, Llc | 0.00% | 21,419 | $185,274 | $178,849 | -$6,425 | -3.47% | |
| Millennium Management Llc | 0.00% | 19,793 | $171,209 | $165,272 | -$5,937 | -3.47% | |
| Janney Montgomery Scott Llc | 0.00% | 17,516 | $152,000 | $146,259 | -$5,741 | -3.78% | |
| Brevan Howard Capital Management Lp | 0.00% | 16,388 | $141,756 | $136,840 | -$4,916 | -3.47% | |
| Deutsche Bank Ag\ | 0.00% | 16,137 | $139,585 | $134,744 | -$4,841 | -3.47% | |
| Raffles Associates Lp | 0.11% | 15,000 | $129,750 | $125,250 | -$4,500 | -3.47% | |
| Graham Capital Management, L.P. | 0.00% | 14,835 | $128,323 | $123,872 | -$4,451 | -3.47% | |
| Strs Ohio | 0.00% | 14,000 | $121,100 | $116,900 | -$4,200 | -3.47% | |
| Bank Of America Corp | 0.00% | 13,954 | $120,702 | $116,516 | -$4,186 | -3.47% | |
| Rhumbline Advisers | 0.00% | 13,659 | $118,143 | $114,053 | -$4,090 | -3.46% |
Frequently asked questions about AP
Who owns the most AP stock?
The largest holders of AP 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 AMPCO-PITTSBURGH CORP (AP).
Is AP widely held by superinvestors?
Many widely followed stocks like AP appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly AP 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.