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Buy Day today: Neutral (51) Mixed market breadth · no major macro event
ACM

Aecom Technology Corporation

Industrials · Engineering & Construction

62.00$ -2.2% vs. previous close Closing price · As of: Sep 18, 2026

Ownership

Ownership Structure

Who owns Aecom Technology Corporation (ACM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.4% of the shares are freely tradable; institutional investors hold 93.8%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 93.8%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 0.5%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 99.4%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 5.6%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 129Mio.

Largest Shareholders

Institutions

Institutions ACM
Name Stake (%) Shares Change (%) Date
BlackRock Inc 12.25 15,760,364 +3.6 03/31/2026
PRIMECAP Management Company 6.83 8,787,043 +1.6 06/30/2026
Vanguard Capital Management, LLC 4.51 5,800,366 +0.0 03/31/2026
Vanguard Portfolio Management, LLC 4.28 5,506,279 +0.0 03/31/2026
Barrow Hanley Mewhinney & Strauss LLC 4.27 5,497,153 +92.7 06/30/2026
State Street Corp 3.92 5,041,460 +0.0 03/31/2026
Amvescap Plc. 2.78 3,575,351 -17.2 03/31/2026

Funds

Funds ACM
Name Stake (%) Shares Change (%) Date
UBS: Global Equity 3.77 4,857,720 +0.0 03/31/2026
iShares Core S&P Mid-Cap ETF 3.50 4,501,364 +0.0 08/31/2026
Vanguard MStar Total Stk Mkt Idx Invest 3.18 4,089,014 +0.3 07/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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