AECOM (ACM) Ownership
ACM ownership summary
as of October 18, 2026- Institutions
- 96.7% of shares outstanding
- Insiders
- 0.50% of shares outstanding
- Shares outstanding
- 128.7M
- Float
- 128.0M shares available to trade
- Short interest
- 5.82% 5.9M shares short
- Days to cover
- 3.24 short interest up 3.2% vs prior month
- Institutions 96.72%
- Insiders 0.50%
- Other investors 2.79%
ACM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 11.17% | 14.4M | $847.5M | −1.4M (−8.8%) | June 30, 2026 |
| 2 | PRIMECAP Management Company | 6.83% | 8.8M | $517.9M | +139,970 (+1.6%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.51% | 5.8M | $342.3M | +7,676 (+0.1%) | June 30, 2026 |
| 4 | Barrow Hanley Mewhinney & Strauss LLC | 4.27% | 5.5M | $324.0M | +2.6M (+92.7%) | June 30, 2026 |
| 5 | Vanguard Portfolio Management, LLC | 4.26% | 5.5M | $323.4M | −19,642 (−0.4%) | June 30, 2026 |
| 6 | State Street Corp | 3.19% | 4.1M | $242.0M | −935,362 (−18.6%) | June 30, 2026 |
| 7 | FMR Inc | 2.92% | 3.8M | $221.5M | +1.7M (+78.3%) | June 30, 2026 |
| 8 | UBS Asset Mgmt Americas Inc | 2.77% | 3.6M | $210.1M | +83,360 (+2.4%) | June 30, 2026 |
| 9 | Amvescap Plc. | 2.48% | 3.2M | $188.1M | −383,478 (−10.7%) | June 30, 2026 |
| 10 | First Trust Advisors L.P. | 1.90% | 2.4M | $144.2M | −580,354 (−19.2%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 1.90% | 2.4M | $144.2M | −23,711 (−1.0%) | June 30, 2026 |
| 12 | Impax Asset Management Group PLC | 1.65% | 2.1M | $125.4M | +745,672 (+53.9%) | June 30, 2026 |
| 13 | Qube Research & Technologies | 1.65% | 2.1M | $124.9M | +1.7M (+379.7%) | June 30, 2026 |
| 14 | Arrowstreet Capital Limited Partnership | 1.63% | 2.1M | $123.6M | +1.9M (+778.9%) | June 30, 2026 |
| 15 | NORGES BANK | 1.44% | 1.9M | $109.2M | −302,622 (−14.0%) | June 30, 2026 |
| 16 | AQR Capital Management LLC | 1.40% | 1.8M | $105.8M | +734,156 (+69.2%) | June 30, 2026 |
| 17 | D. E. Shaw & Co LP | 1.33% | 1.7M | $100.9M | +648,929 (+61.1%) | June 30, 2026 |
| 18 | UBS Group AG | 1.32% | 1.7M | $99.9M | +269,798 (+18.9%) | June 30, 2026 |
| 19 | Dimensional Fund Advisors, Inc. | 1.27% | 1.6M | $96.7M | +253,225 (+18.2%) | June 30, 2026 |
| 20 | Morgan Stanley - Brokerage Accounts | 1.27% | 1.6M | $96.6M | −41,040 (−2.4%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 12 holders added 10.7M shares and 8 cut 3.7M.
ACM top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 3.56% | 4.6M | $270.2M | −1,632 (−0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.17% | 4.1M | $240.7M | −4,420 (−0.1%) | August 31, 2026 |
| 3 | Vanguard Capital Opportunity Inv | 2.67% | 3.4M | $202.4M | −7,500 (−0.2%) | June 30, 2026 |
| 4 | Vanguard Small Cap Index | 2.30% | 3.0M | $174.3M | +2,061 (+0.1%) | August 31, 2026 |
| 5 | Vanguard MStar Small Cap Value Index | 1.46% | 1.9M | $110.7M | +1,438 (+0.1%) | August 31, 2026 |
| 6 | Vanguard PRIMECAP Core Inv | 1.42% | 1.8M | $107.9M | +133,000 (+7.8%) | June 30, 2026 |
| 7 | Bridge Builder Large Cap Value | 1.13% | 1.5M | $86.0M | +116,512 (+8.7%) | September 30, 2026 |
| 8 | Fidelity Value | 1.13% | 1.4M | $85.3M | +152,500 (+11.8%) | August 31, 2026 |
| 9 | First Trust SMID Cp Rising Div Achv ETF | 0.92% | 1.2M | $69.8M | — | September 30, 2026 |
| 10 | PRIMECAP Odyssey Aggressive Growth | 0.86% | 1.1M | $65.3M | −2,400 (−0.2%) | June 30, 2026 |
| 11 | PRIMECAP Odyssey Stock | 0.83% | 1.1M | $62.9M | −5,630 (−0.5%) | June 30, 2026 |
| 12 | Global X US Infrastructure Dev ETF | 0.82% | 1.1M | $62.3M | +7,380 (+0.7%) | September 30, 2026 |
| 13 | Invesco Water Resources ETF | 0.78% | 1.0M | $59.5M | — | September 30, 2026 |
| 14 | BNP Paribas Aqua C C | 0.75% | 969K | $57.1M | −138 (−0.0%) | August 31, 2026 |
| 15 | BNP Paribas Aqua I | 0.75% | 962K | $56.7M | −86 (−0.0%) | August 31, 2026 |
| 16 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.73% | 940K | $55.4M | −10,583 (−1.1%) | August 31, 2026 |
| 17 | Utmost Newton Global Income | 0.68% | 870K | $51.3M | +870,352 (0.0%) | August 31, 2026 |
| 18 | Invesco S&P MidCap Quality ETF | 0.63% | 813K | $47.9M | +850 (+0.1%) | September 30, 2026 |
| 19 | First Trust Water ETF | 0.62% | 803K | $47.3M | — | September 30, 2026 |
| 20 | PRIMECAP Odyssey Growth | 0.58% | 752K | $44.3M | −5,400 (−0.7%) | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ACM insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-08-15 | Troy Rudd | Sell | $119.56 | 53,097 | $6.3M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ACM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ACM
Institutional investors own 96.7% of AECOM's shares and insiders 0.50%. The largest holder is BlackRock Inc with 11.17% of the shares (14.4M), as of June 30, 2026. Among the top 20 institutions, 12 added shares and 8 reduced their stake in the latest filings. Short interest is 5.82% of the float, or 3.24 days of average trading volume. The share count fell 7.0% since 2014.
Related: ACM analyst forecast, ACM key metrics, ACM dividend history. See the ACM stock overview for the latest quote and news.
ACM ownership FAQ
Who owns the most AECOM stock?
The largest shareholders of AECOM are BlackRock Inc (11.17%), PRIMECAP Management Company (6.83%), Vanguard Capital Management, LLC (4.51%), Barrow Hanley Mewhinney & Strauss LLC (4.27%), Vanguard Portfolio Management, LLC (4.26%).
What percentage of AECOM is owned by institutions?
Institutions hold 96.7% of AECOM's shares outstanding; insiders hold 0.50%.
Which funds own AECOM?
The largest fund holders of AECOM are iShares Core S&P Mid-Cap ETF (3.56%), Vanguard MStar Total Stk Mkt Idx Invest (3.17%), Vanguard Capital Opportunity Inv (2.67%), Vanguard Small Cap Index (2.30%), Vanguard MStar Small Cap Value Index (1.46%).
What is AECOM's short interest?
5.9M shares of AECOM were sold short, 5.82% of the float; at the average daily volume it would take 3.24 days to cover.
Are insiders buying or selling AECOM?
Of the latest 1 reported insider transactions in AECOM (since August 15, 2025), 0 were purchases and 1 were sales.
How many shares of AECOM are outstanding?
AECOM has 128.7M shares outstanding, of which 128.0M are in the public float.