Aecom
Aecom (ACM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ACM · as of Sep 30, 2025
Ownership Breakdown
652
Institutional Holders
▲ 4 vs Q2
$15.11B
Total Inst. Value
▲ $1.82B vs Q2
128.52M
Shares Outstanding
freeFloat 99.44%
115.84M
13F Shares Held
▼ 2.49M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ACM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. services-engineering services | 14.69M | 11.10% | 11.10% | $1.92T | Nov 12, 2025 | ▼ 593.5K |
VANGUARD GROUP INC services-engineering services | 12.52M | 9.46% | 9.46% | $1.63T | Nov 7, 2025 | ▼ 93.1K |
PRIMECAP MANAGEMENT CO/CA/ services-engineering services | 8.88M | 6.71% | 6.71% | $1.16T | Nov 12, 2025 | ▼ 684.9K |
STATE STREET CORP services-engineering services | 5.11M | 3.86% | 3.86% | $666.39B | Nov 14, 2025 | ▲ 127.0K |
INVESCO LTD. services-engineering services | 4.98M | 3.76% | 3.76% | $649.74B | Nov 13, 2025 | ▲ 618.2K |
FIRST TRUST ADVISORS LP services-engineering services | 4.22M | 3.19% | 3.19% | $550.11B | Nov 12, 2025 | ▲ 2.16M |
PICTET ASSET MANAGEMENT HOLDING SA services-engineering services | 3.77M | 2.85% | 2.85% | $492.11B | Nov 18, 2025 | ▲ 134.1K |
ALLIANCEBERNSTEIN L.P. services-engineering services | 2.61M | 1.97% | 1.97% | $340.18B | Nov 14, 2025 | ▼ 188.7K |
GEODE CAPITAL MANAGEMENT, LLC services-engineering services | 2.42M | 1.83% | 1.83% | $314.60B | Nov 12, 2025 | ▲ 53.2K |
UBS ASSET MANAGEMENT AMERICAS INC services-engineering services | 2.37M | 1.79% | 1.79% | $308.73B | Nov 14, 2025 | ▼ 280.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
21
Increased
+5.71M shares0
New Positions
first time holders28
Decreased
−4.26M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.45M
+5.71M / −4.26M
Net new holders
-7
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ACM insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Kapoor Gaurav CHIEF FINANCIAL OFFICER (PAO) | May 14, 2026 | Purchase | 1,420 | $71.12 | $101.0K | 88.1K | Form 4 ↗ |
Rudd Troy CHIEF EXECUTIVE OFFICER | May 14, 2026 | Purchase | 4,225 | $71.02 | $300.1K | 142.2K | Form 4 ↗ |
Wolfenbarger Janet Carol director | Mar 3, 2026 | Award | 2,002 | — | — | 38.8K | Form 4 ↗ |
van 't Noordende Alexander M director | Mar 3, 2026 | Award | 2,002 | — | — | 12.4K | Form 4 ↗ |
Tishman Daniel R. director | Mar 3, 2026 | Award | 2,002 | — | — | 23.7K | Form 4 ↗ |
Stotlar Douglas director | Mar 3, 2026 | Award | 2,236 | — | — | 38.8K | Form 4 ↗ |
KERR DEREK J director | Mar 3, 2026 | Award | 2,002 | — | — | 3.7K | Form 4 ↗ |
Pipes Kristy director | Mar 3, 2026 | Award | 2,002 | — | — | 8.6K | Form 4 ↗ |
Buss Brad W director | Mar 3, 2026 | Award | 2,002 | — | — | 28.5K | Form 4 ↗ |
Rudd Troy CHIEF EXECUTIVE OFFICER | Dec 23, 2025 | Gift | 600 | — | — | 259.8K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Aecom (ACM) is primarily owned by institutional investors, who hold approximately 90.1% of total shares outstanding. Company insiders own approximately 0.56%, while retail and public investors account for the remaining 9.31%.
The largest institutional shareholder of Aecom is BLACKROCK, INC., holding approximately 14.69 million shares — equal to 11.10% of outstanding shares — as of September 30, 2025.
A total of 652 institutional investors currently hold ACM stock, with a combined institutional value of approximately $15.11 billion as of the most recent 13F filing period.
Frequently asked questions
ACM ownershipAecom (ACM) is primarily owned by institutional investors, who hold approximately 90.1% of shares. The largest shareholder is BLACKROCK, INC. with a 11.10% stake. Company insiders hold 0.56%. Data sourced from SEC Form 13F as of September 30, 2025.