American Water Works Company, Inc.
MX ˙ BMV ˙ US0304201033
SecurityMX:AWK / American Water Works Company, Inc.
InstitutionBoston Common Asset Management, LLC
Latest Disclosed Ownership127,660 shares
Latest Disclosed Value $ 17,373,249
Boston Common Asset Management, LLC reports 4.23% increase in ownership of AWK / American Water Works Company, Inc.

On May 7, 2026 - Boston Common Asset Management, LLC filed a 13F-HR form disclosing ownership of 127,660 shares of American Water Works Company, Inc. (MX:AWK) valued at $17,373,249 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 7, 2026 disclosing 122,475 shares of American Water Works Company, Inc.. This represents a change in shares of 4.23% during the quarter.

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)
2026-05-07 2026-03-31 13F American Water Works COM 030420103 127,660 5,185 4.23 17,373 8.70 1.1188
2026-05-07 2025-12-31 13F/A-1 American Water Works COM 030420103 122,475 -47,711 -28.03 15,983 -32.53 0.9632
2026-01-15 2025-12-31 13F American Water Works COM 030420103 138,833 -31,353 18,118 0.9180
2025-10-30 2025-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 170,186 -3,498 -2.01 23,688 -1.96 0.6626
2025-07-22 2025-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 173,684 15,589 9.86 24,161 3.60 0.6773
2025-04-03 2025-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 158,095 -30,682 -16.25 23,322 -0.76 0.7079
2025-01-15 2024-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 188,777 -3,973 -2.06 23,501 83,828.57 0.6842
2024-10-09 2024-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 192,750 -28,737 -12.97 28 0.00 0.7348
2024-07-08 2024-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 221,487 9,964 4.71 29 12.00 0.7331
2024-04-11 2024-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 211,523 -12,006 -5.37 26 -13.79 0.6182
2024-01-09 2023-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 223,529 -9,607 -4.12 30 3.57 0.6713
2023-10-11 2023-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 233,136 -2,845 -1.21 29 -15.15 0.6887
2023-07-24 2023-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 235,981 -6,883 -2.83 34 -5.71 0.7195
2023-05-17 2023-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 242,864 -1,909 -0.78 36 -5.41 0.7404
2023-01-26 2022-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 244,773 6,008 2.52 37 -99.88 1.7843
2022-10-20 2022-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 238,765 71,335 42.61 31,078 24.77 1.6286
2022-08-10 2022-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 167,430 61,388 57.89 24,909 41.91 1.2416
2022-05-16 2022-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 106,042 -57,303 -35.08 17,553 -43.10 0.7583
2022-01-31 2021-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 163,345 -1,140 -0.69 30,849 10.95 1.2464
2021-11-12 2021-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 164,485 -701 -0.42 27,805 9.21 1.2022
2021-08-19 2021-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 165,186 121,064 274.38 25,460 284.88 1.0946
2021-05-14 2021-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 44,122 8,175 22.74 6,615 19.90 0.4175
2021-02-05 2020-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 35,947 4,343 13.74 5,517 20.48 0.3851
2020-11-10 2020-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 31,604 3,312 11.71 4,579 25.80 0.4352
2020-08-10 2020-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 28,292 1,667 6.26 3,640 14.36 0.3884
2020-05-08 2020-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 26,625 1,408 5.58 3,183 2.74 0.4488
2020-01-28 2019-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 25,217 -28,119 -52.72 3,098 -53.24 0.3610
2019-11-07 2019-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 53,336 -556 -1.03 6,626 6.00 0.8181
2019-07-26 2019-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 53,892 -564 -1.04 6,251 10.09 0.7788
2019-05-03 2019-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 54,456 -2,065 -3.65 5,678 10.68 0.7371
2019-01-25 2018-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 56,521 -310 -0.55 5,130 2.62 0.7481
2018-11-01 2018-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 56,831 -3,420 -5.68 4,999 -2.82 0.6199
2018-08-06 2018-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 60,251 865 1.46 5,144 5.47 0.6369
2018-04-26 2018-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 59,386 -12,386 -17.26 4,877 -25.72 0.5746
2018-02-07 2017-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 71,772 4,027 5.94 6,566 19.80 0.7789
2017-11-13 2017-09-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 67,745 16,030 31.00 5,481 35.97 0.6832
2017-08-14 2017-06-30 13F AMERICAN WTR WKS CO INC NEW COM 030420103 51,715 29,470 132.48 4,031 133.01 0.5308
2017-05-24 2017-03-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 22,245 11,680 110.55 1,730 126.44 0.2352
2017-02-14 2016-12-31 13F AMERICAN WTR WKS CO INC NEW COM 030420103 10,565 10,565 764 0.1115
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.