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ACM · Aecom

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$65.17 +0.13 (+0.20%)
Market Cap
$8.39B
Shares
128.70M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 571
Total Value: $8,288,872,372
Total Shares: 119,473,293

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 571 13F filers · Δ vs Mar 31, 2026
Top Holder
12.1%
Sep 2023 → Jun 2026 · range 12.1% – 15.2%
−1.8 pts
Top 5
33.6%
Sep 2023 → Jun 2026 · range 33.6% – 46.7%
−2.2 pts
Top 10
48.0%
Sep 2023 → Jun 2026 · range 48.0% – 59.7%
−1.4 pts
HHI
353
Sep 2023 → Jun 2026 · range 353 – 585
Broadly held−38

Quarterly Activity

vs Mar 31, 2026
New
84
Increased
184
Decreased
235
Sold Out
137
Unchanged
68
Holder count: -53
Institutional value: -14.1%
Shares held: +5.1%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 582
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 868857 CUSIP 00766T100 13F (30d) 511 filings 502 filers Visit website Investor relations