Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ACM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 15.8M | $1.34B | +3.6% | 12.263% | 0.02% |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | 8.6M | $733.4M | -0.2% | 6.728% | 0.58% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 5.8M | $492.0M | — | 4.513% | 0.01% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 5.5M | $467.0M | — | 4.284% | 0.02% |
| 5 | STATE STREET CORP | 5.0M | $427.6M | -0.0% | 3.923% | 0.01% |
| 6 | Invesco Ltd. | 3.6M | $303.3M | -17.2% | 2.782% | 0.05% |
| 7 | UBS ASSET MANAGEMENT AMERICAS INC | 3.5M | $295.3M | +25.5% | 2.709% | 0.06% |
| 8 | FIRST TRUST ADVISORS LP | 3.0M | $256.7M | -25.8% | 2.355% | 0.18% |
| 9 | BARROW HANLEY MEWHINNEY & STRAUSS LLC | 2.9M | $242.0M | +44.9% | 2.220% | 0.79% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 2.5M | $208.9M | +1.0% | 1.921% | 0.01% |
| 11 | Pictet Asset Management Holding SA | 2.1M | $180.5M | -27.2% | 1.656% | 0.19% |
| 12 | FMR LLC | 2.1M | $178.8M | +77.7% | 1.640% | 0.01% |
| 13 | NORTHERN TRUST CORP | 2.0M | $166.7M | -3.5% | 1.529% | 0.02% |
| 14 | MORGAN STANLEY | 1.7M | $142.5M | +8.9% | 1.307% | 0.01% |
| 15 | UBS Group AG | 1.4M | $121.1M | +1.9% | 1.111% | 0.02% |
| 16 | DIMENSIONAL FUND ADVISORS LP | 1.4M | $117.7M | +6.3% | 1.080% | 0.02% |
| 17 | Impax Asset Management Group plc | 1.4M | $117.3M | -0.7% | 1.076% | 0.82% |
| 18 | Bank of New York Mellon Corp | 1.3M | $110.1M | -0.2% | 1.010% | 0.02% |
| 19 | Amundi | 1.2M | $104.0M | +16.2% | 0.954% | 0.03% |
| 20 | MANUFACTURERS LIFE INSURANCE COMPANY, THE | 1.2M | $103.6M | +18.3% | 0.950% | 0.09% |
| 21 | D. E. Shaw & Co., Inc. | 1.1M | $90.1M | +195.9% | 0.827% | 0.08% |
| 22 | AQR CAPITAL MANAGEMENT LLC | 1.1M | $89.6M | +521.4% | 0.826% | 0.04% |
| 23 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 969K | $82.2M | +7.3% | 0.754% | 0.11% |
| 24 | Ninety One UK Ltd | 962K | $81.6M | -25.6% | 0.749% | 0.19% |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 929K | $78.8M | +2.3% | 0.723% | 0.01% |
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 ACM — a direct measure of their conviction.
Filings activity in ACM 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 | 606 | 3.7% | 102.07% | 15.54 pp | $9.20B | 13% |
| Q4 2025 | 629 | +0.8% | 117.61% | 42.28 pp | $10.60B | 26% |
| Q3 2025 | 624 | +0.5% | 159.89% | +17.98 pp | $14.41B | +13% |
| Q2 2025 | 621 | +11% | 141.91% | +28.13 pp | $12.79B | +25% |
| Q1 2025 | 560 | +1.4% | 113.78% | 16.74 pp | $10.25B | 13% |
| Q4 2024 | 552 | +9.1% | 130.52% | +5.89 pp | $11.76B | +4.7% |
| Q3 2024 | 506 | +2.2% | 124.63% | 9.49 pp | $11.23B | 7.1% |
| Q2 2024 | 495 | — | 134.12% | — | $12.09B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 16, 2026 | Poloni Lara | Buy | 4K | $70.63 | $298K |
| May 14, 2026 | Rudd Troy | Buy | 4K | $71.02 | $300K |
Quick answers to the most common questions about buying ACM stock.
Based on Q1 2026 13F filings, institutional ownership of Aecom stands at 102.1%, held across 606 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ACM, with approximately 15,760,364 shares worth $1.34B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of ACM.
Our composite Smart Money Score for ACM is 22 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
107 institutions opened new positions in ACM during Q1 2026, while 130 fully exited. 151 added to existing positions and 347 trimmed.
ACM institutional ownership fell by 15.54 percentage points quarter-over-quarter, with a net change of -23 holders.
The top 10 institutions account for 51.8% of all reported 13F value in ACM, and the top 25 account for 71.0%.
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.
Aecom (ACM) Institutional Ownership