AECOM
US ˙ NYSE ˙ US00766T1007

SecurityACM / AECOM
InstitutionBoston Partners
Latest Disclosed Ownership119,276 shares
Latest Disclosed Value $ 10,117,156
Boston Partners reports 8.04% decrease in ownership of ACM / AECOM

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 119,276 shares of AECOM (US:ACM) valued at $10,116,990 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 129,707 shares of AECOM. This represents a change in shares of -8.04% during the quarter. The current value of the position is $8,636,775 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F AECOM COM 00766T100 119,276 -10,431 -8.04 10,117 -18.18 0.0045
2026-02-13 2025-12-31 13F AECOM COM 00766T100 129,707 15,594 13.67 12,365 -16.95 0.0128
2025-11-13 2025-09-30 13F AECOM COM 00766T100 114,113 -1,480 -1.28 14,889 14.12 0.0153
2025-08-12 2025-06-30 13F/A-1 AECOM COM 00766T100 115,593 8,161 7.60 13,047 30.96 0.0145
2025-08-07 2025-06-30 13F AECOM COM 00766T100 115,593 8,161 13,047 0.0060
2025-05-13 2025-03-31 13F AECOM COM 00766T100 107,432 107,432 9,963 0.0120
2021-11-05 2021-09-30 13F AECOM COM 00766T100 0 -113,691 -100.00 0 -100.00
2021-08-12 2021-06-30 13F AECOM COM 00766T100 113,691 -151,569 -57.14 7,199 -57.67 0.0092
2021-05-10 2021-03-31 13F AECOM COM 00766T100 265,260 -268,851 -50.34 17,007 -36.04 0.0228
2021-02-10 2020-12-31 13F/A-1 AECOM COM 00766T100 534,111 -88,267 -14.18 26,588 2.10 0.0414
2021-02-04 2020-12-31 13F AECOM COM 00766T100 534,111 -88,267 26,588 15,951.2196
2020-11-13 2020-09-30 13F/A-1 AECOM COM 00766T100 622,378 -21,398 -3.32 26,040 7.87 0.0474
2020-11-09 2020-09-30 13F AECOM COM 00766T100 643,776 0 24,141 17,722.3697
2020-08-12 2020-06-30 13F AECOM COM 00766T100 643,776 325,625 102.35 24,141 154.20 0.0443
2020-05-13 2020-03-31 13F AECOM COM 00766T100 318,151 651 0.21 9,497 -30.64 0.0189
2020-02-06 2019-12-31 13F/A-1 AECOM COM 00766T100 317,500 4,446 1.42 13,693 16.45 0.0181
2020-02-05 2019-12-31 13F AECOM COM 00766T100 317,500 4,446 13,693 7,698.6045
2019-11-20 2019-09-30 13F/A-1 AECOM COM 00766T100 313,054 -5,166 -1.62 11,759 -2.37 0.0159
2019-11-08 2019-09-30 13F AECOM COM 00766T100 317,205 -1,015 11,998 0.0159
2019-08-26 2019-06-30 13F/A-1 AECOM COM 00766T100 318,220 -5,963 -1.84 12,044 25.21 0.0158
2019-08-09 2019-06-30 13F AECOM COM 00766T100 318,220 -5,963 12,044
2019-05-13 2019-03-31 13F/A-1 AECOM COM 00766T100 324,183 -6,633 -2.01 9,619 9.72 0.0127
2019-05-03 2019-03-31 13F AECOM COM 00766T100 324,183 -6,633 9,619
2019-02-07 2018-12-31 13F AECOM COM 00766T100 330,816 24,483 7.99 8,767 -12.37 0.0126
2018-11-14 2018-09-30 13F AECOM COM 00766T100 306,333 -38,882 -11.26 10,005 -12.25 0.0116
2018-08-03 2018-06-30 13F AECOM COM 00766T100 345,215 62,266 22.01 11,402 13.10 0.0137
2018-05-04 2018-03-31 13F AECOM COM 00766T100 282,949 -30,221 -9.65 10,081 -13.35 0.0122
2018-02-14 2017-12-31 13F/A-1 AECOM COM 00766T100 313,170 147,291 88.79 11,634 90.53 0.0137
2018-02-01 2017-12-31 13F AECOM COM 00766T100 313,170 147,291 11,634
2017-11-02 2017-09-30 13F AECOM COM 00766T100 165,879 506 0.31 6,106 14.19 0.0075
2017-08-02 2017-06-30 13F AECOM COM 00766T100 165,373 -3,340 -1.98 5,347 -10.94 0.0068
2017-05-03 2017-03-31 13F AECOM COM 00766T100 168,713 -16,432 -8.88 6,004 -10.81 0.0077
2017-02-06 2016-12-31 13F AECOM COM 00766T100 185,145 -116,005 -38.52 6,732 -24.81 0.0089
2016-11-09 2016-09-30 13F AECOM COM 00766T100 301,150 27,845 10.19 8,953 3.11 0.0125
2016-08-05 2016-06-30 13F AECOM COM 00766T100 273,305 -39,632 -12.66 8,683 -9.88 0.0125
2016-05-12 2016-03-31 13F AECOM COM 00766T100 312,937 -16,209 -4.92 9,635 -2.52 0.0142
2016-02-08 2015-12-31 13F AECOM COM 00766T100 329,146 3,999 1.23 9,884 10.50 0.0142
2015-11-10 2015-09-30 13F AECOM COM 00766T100 325,147 -55,366 -14.55 8,945 -28.93 0.0136
2015-08-10 2015-06-30 13F AECOM COM 00766T100 380,513 60,535 18.92 12,587 27.63 0.0181
2015-05-05 2015-03-31 13F AECOM COM 00766T100 319,978 -109,082 -25.42 9,862 -24.32 0.0147
2015-02-09 2014-12-31 13F AECOM TECHNOLOGY CORP DELAWA COM 00766T100 429,060 220,683 105.91 13,031 85.28 0.0196
2014-11-12 2014-09-30 13F AECOM TECHNOLOGY CORP DELAWA COM 00766T100 208,377 0 0.00 7,033 4.81 0.0114
2014-08-08 2014-06-30 13F AECOM TECHNOLOGY CORP DELAWA COM 00766T100 208,377 1,886 0.91 6,710 1.01 0.0112
2014-05-07 2014-03-31 13F AECOM TECHNOLOGY CORP DELAWA COM 00766T100 206,491 34,335 19.94 6,643 31.10 0.0121
2014-02-06 2013-12-31 13F AECOM TECHNOLOGY CORP DELAWA COM 00766T100 172,156 78,104 83.04 5,067 72.29 0.0104
2013-11-12 2013-09-30 13F AECOM TECHNOLOGY CORP DELAWA COM 00766T100 94,052 94,052 2,941 0.0071
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.