Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in AP held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | GAMCO INVESTORS, INC. ET AL | 2.5M | $16.7M | +0.9% | 12.260% | 0.16% |
| 2 | GABELLI FUNDS LLC | 1.4M | $9.4M | -0.3% | 6.887% | 0.06% |
| 3 | AMERIPRISE FINANCIAL INC | 1.2M | $7.9M | +0.9% | 5.771% | 0.00% |
| 4 | WELLS FARGO & COMPANY/MN | 656K | $4.4M | +65600000.0% | 3.227% | 0.00% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 600K | $4.0M | — | 2.952% | 0.00% |
| 6 | RENAISSANCE TECHNOLOGIES LLC | 423K | $2.8M | -8.3% | 2.082% | 0.00% |
| 7 | DIMENSIONAL FUND ADVISORS LP | 355K | $2.4M | +6.1% | 1.749% | 0.00% |
| 8 | Huntleigh Advisors, Inc. | 230K | $1.5M | — | 1.134% | 0.26% |
| 9 | AMERICAN CENTURY COMPANIES INC | 219K | $1.5M | — | 1.077% | 0.00% |
| 10 | Meros Investment Management, LP | 215K | $1.4M | — | 1.057% | 0.63% |
| 11 | BlackRock, Inc. | 203K | $1.4M | +21.3% | 0.999% | 0.00% |
| 12 | SEI INVESTMENTS CO | 184K | $1.2M | +104.1% | 0.907% | 0.00% |
| 13 | JANE STREET GROUP, LLC | 168K | $1.1M | +563.4% | 0.828% | 0.01% |
| 14 | MARSHALL WACE, LLP | 161K | $1.1M | -22.6% | 0.793% | 0.00% |
| 15 | MILLENNIUM MANAGEMENT LLC | 160K | $1.1M | — | 0.789% | 0.00% |
| 16 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 154K | $1.0M | +43.6% | 0.760% | 0.02% |
| 17 | GEODE CAPITAL MANAGEMENT, LLC | 135K | $909K | -5.0% | 0.664% | 0.00% |
| 18 | Teton Advisors, LLC | 130K | $874K | 0.0% | 0.640% | 0.61% |
| 19 | O'SHAUGHNESSY ASSET MANAGEMENT, LLC | 122K | $823K | — | 0.602% | 0.00% |
| 20 | RITHOLTZ WEALTH MANAGEMENT | 119K | $798K | — | 0.584% | 0.01% |
| 21 | EAM Investors, LLC | 116K | $778K | -22.0% | 0.570% | 0.09% |
| 22 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 107K | $721K | +158.1% | 0.528% | 0.00% |
| 23 | VANGUARD FIDUCIARY TRUST CO | 73K | $489K | — | 0.358% | 0.00% |
| 24 | RBF Capital, LLC | 60K | $403K | 0.0% | 0.295% | 0.02% |
| 25 | STATE STREET CORP | 59K | $399K | -25.8% | 0.292% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in AP — a direct measure of their conviction.
Filings activity in AP during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 62 | +48% | 28.53% | +10.31 pp | $69M | +57% |
| Q4 2025 | 42 | +17% | 18.22% | +10.40 pp | $44M | +133% |
| Q3 2025 | 36 | 10% | 7.82% | 2.58 pp | $19M | 25% |
| Q2 2025 | 40 | +5.3% | 10.40% | +2.88 pp | $25M | +38% |
| Q1 2025 | 38 | +2.7% | 7.52% | +0.39 pp | $18M | +5.4% |
| Q4 2024 | 37 | +12% | 7.13% | +0.33 pp | $17M | +4.8% |
| Q3 2024 | 33 | 21% | 6.80% | +4.06 pp | $16M | +148% |
| Q2 2024 | 42 | — | 2.74% | — | $7M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying AP stock.
Based on Q1 2026 13F filings, institutional ownership of Ampco-Pittsburgh Corporation stands at 28.5%, held across 62 reporting institutions.
GAMCO INVESTORS, INC. ET AL is the largest reported institutional holder of AP, with approximately 2,491,957 shares worth $0.02B as of Q1 2026.
Yes — 4 widely-followed marquee investors appear among the top 25 institutional holders of AP, including RENAISSANCE TECHNOLOGIES LLC, JANE STREET GROUP, LLC, MILLENNIUM MANAGEMENT LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for AP is 81 out of 100 (Strong Smart Money). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
25 institutions opened new positions in AP during Q1 2026, while 5 fully exited. 33 added to existing positions and 4 trimmed.
AP institutional ownership rose by 10.31 percentage points quarter-over-quarter, with a net change of +20 holders.
The top 10 institutions account for 76.1% of all reported 13F value in AP, and the top 25 account for 95.2%.
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.
Ampco-Pittsburgh Corporation (AP) Institutional Ownership