AP Institutional Ownership & Shareholders
AMPCO-PITTSBURGH CORP (AP) is currently held by 84 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $99.47M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
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 $22.75M, representing an estimated gain of +6.94% 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
84
Total Reported Value
$99.47M
Largest Holder
Gamco Investors, Inc. Et Al
Largest Position
$21.28M
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
101
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 | $22,753,418 | +$1,475,897 | +6.94% | |
| Gabelli Funds Llc | 0.08% | 1,391,800 | $12,039,070 | $12,874,150 | +$835,080 | +6.94% | |
| Blackrock, Inc. | 0.00% | 982,611 | $8,499,585 | $9,089,152 | +$589,567 | +6.94% | |
| Ameriprise Financial Inc | 0.00% | 905,679 | $7,834,123 | $8,377,531 | +$543,408 | +6.94% | |
| Wells Fargo & Company/Mn | 0.00% | 660,945 | $5,717,170 | $6,113,741 | +$396,571 | +6.94% | |
| Vanguard Capital Management Llc | 0.00% | 604,091 | $5,225,387 | $5,587,842 | +$362,455 | +6.94% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 414,419 | $3,584,724 | $3,833,376 | +$248,652 | +6.94% |
| Geode Capital Management, Llc | 0.00% | 342,836 | $2,966,779 | $3,171,233 | +$204,454 | +6.89% | |
| American Century Companies Inc | 0.00% | 328,848 | $2,844,535 | $3,041,844 | +$197,309 | +6.94% | |
| Dimensional Fund Advisors Lp | 0.00% | 295,444 | $2,555,702 | $2,732,857 | +$177,155 | +6.93% | |
| Meros Investment Management, Lp | 0.66% | 239,910 | $2,075,222 | $2,219,168 | +$143,946 | +6.94% | |
| Susquehanna International Group, Llp | 0.00% | 195,321 | $1,689,527 | $1,806,719 | +$117,192 | +6.94% | |
| Acadian Asset Management Llc | 0.00% | 191,015 | $1,646,000 | $1,766,889 | +$120,889 | +7.34% | |
| O'Shaughnessy Asset Management, Llc | 0.01% | 174,312 | $1,507,799 | $1,612,386 | +$104,587 | +6.94% | |
| State Street Corp | 0.00% | 159,316 | $1,378,083 | $1,473,673 | +$95,590 | +6.94% | |
| Jane Street Group, Llc | 0.00% | 150,371 | $1,300,709 | $1,390,932 | +$90,223 | +6.94% | |
| Huntleigh Advisors, Inc. | 0.17% | 141,172 | $1,221,145 | $1,305,841 | +$84,696 | +6.94% | |
| Ritholtz Wealth Management | 0.02% | 132,943 | $1,149,957 | $1,229,723 | +$79,766 | +6.94% | |
| Teton Advisors, Llc | 0.65% | 130,000 | $1,124,500 | $1,202,500 | +$78,000 | +6.94% | |
| Bridgeway Capital Management, Llc | 0.02% | 125,386 | $1,084,589 | $1,159,821 | +$75,232 | +6.94% | |
| Northern Trust Corp | 0.00% | 121,477 | $1,050,777 | $1,123,662 | +$72,885 | +6.94% | |
| Vanguard Portfolio Management Llc | 0.00% | 112,721 | $975,037 | $1,042,669 | +$67,632 | +6.94% | |
| Goldman Sachs Group Inc | 0.00% | 100,724 | $871,263 | $931,697 | +$60,434 | +6.94% | |
| Vanguard Fiduciary Trust Co | 0.00% | 92,875 | $803,369 | $859,094 | +$55,725 | +6.94% | |
| Informed Momentum Co Llc | 0.07% | 90,053 | $778,958 | $832,990 | +$54,032 | +6.94% | |
| Marshall Wace, Llp | 0.00% | 80,361 | $695,123 | $743,339 | +$48,216 | +6.94% | |
| Palumbo Wealth Management Llc | 0.14% | 79,185 | $684,951 | $732,461 | +$47,510 | +6.94% | |
| Sei Investments Co | 0.00% | 65,911 | $570,130 | $609,677 | +$39,547 | +6.94% | |
| Panagora Asset Management Inc | 0.00% | 52,441 | $453,615 | $485,079 | +$31,464 | +6.94% | |
| Citadel Advisors Llc | 0.00% | 51,409 | $444,688 | $475,533 | +$30,845 | +6.94% | |
| Empowered Funds, Llc | 0.00% | 50,286 | $434,974 | $465,146 | +$30,172 | +6.94% | |
| Charles Schwab Investment Management Inc | 0.00% | 39,373 | $340,576 | $364,200 | +$23,624 | +6.94% | |
| Bank Of New York Mellon Corp | 0.00% | 33,984 | $293,964 | $314,352 | +$20,388 | +6.94% | |
| Qube Research & Technologies Ltd | 0.00% | 32,230 | $278,790 | $298,128 | +$19,338 | +6.94% | |
| Ubs Group Ag | 0.00% | 32,154 | $278,132 | $297,425 | +$19,293 | +6.94% | |
| Dynamic Technology Lab Private Ltd | 0.06% | 30,373 | $263,000 | $280,950 | +$17,950 | +6.83% | |
| Occudo Quantitative Strategies Lp | 0.01% | 24,936 | $215,696 | $230,658 | +$14,962 | +6.94% | |
| Xtx Topco Ltd | 0.00% | 23,995 | $207,557 | $221,954 | +$14,397 | +6.94% | |
| Central Pacific Bank - Trust Division | 0.02% | 22,401 | $198,249 | $207,209 | +$8,960 | +4.52% | |
| Gsa Capital Partners Llp | 0.01% | 21,641 | $187,000 | $200,179 | +$13,179 | +7.05% | |
| Nuveen, Llc | 0.00% | 21,419 | $185,274 | $198,126 | +$12,852 | +6.94% | |
| Millennium Management Llc | 0.00% | 19,793 | $171,209 | $183,085 | +$11,876 | +6.94% | |
| Janney Montgomery Scott Llc | 0.00% | 17,516 | $152,000 | $162,023 | +$10,023 | +6.59% | |
| Brevan Howard Capital Management Lp | 0.00% | 16,388 | $141,756 | $151,589 | +$9,833 | +6.94% | |
| Deutsche Bank Ag\ | 0.00% | 16,137 | $139,585 | $149,267 | +$9,682 | +6.94% | |
| Raffles Associates Lp | 0.11% | 15,000 | $129,750 | $138,750 | +$9,000 | +6.94% | |
| Graham Capital Management, L.P. | 0.00% | 14,835 | $128,323 | $137,224 | +$8,901 | +6.94% | |
| Strs Ohio | 0.00% | 14,000 | $121,100 | $129,500 | +$8,400 | +6.94% | |
| Bank Of America Corp | 0.00% | 13,954 | $120,702 | $129,075 | +$8,373 | +6.94% | |
| Rhumbline Advisers | 0.00% | 13,659 | $118,143 | $126,346 | +$8,203 | +6.94% |
Frequently asked questions about AP
Who are the largest institutional holders of AP?
The largest institutional holders of AP reported in the latest SEC Form 13F filings include Gamco Investors, Inc. Et Al, Gabelli Funds Llc, Blackrock, Inc., Ameriprise Financial Inc, and Wells Fargo & Company/Mn. InsiderSet ranks institutional holders by their latest reported AP position.
What is AP institutional ownership?
This page tracks AP positions reported by institutional investment managers through SEC Form 13F. AMPCO-PITTSBURGH CORP (AP) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own AP?
InsiderSet currently tracks 84 institutional managers reporting AP holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of AP shareholders.
How much AP stock do institutions own?
Institutional investment managers disclosed approximately $99.47M in AP holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was AP institutional ownership last updated?
The latest AP institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional AP holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its AP position after the reporting date.
Are institutions buying or selling AP?
Institutional buying and selling can be analyzed by comparing AP positions across consecutive 13F reporting periods. InsiderSet's AP Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View AP ownership changes.
How has AP institutional ownership changed over time?
InsiderSet tracks AP institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.