American Water Works Company, Inc.
MX ˙ BMV ˙ US0304201033
SecurityMX:AWK / American Water Works Company, Inc.
InstitutionBrown Brothers Harriman & Co
Latest Disclosed Ownership84,788 shares
Latest Disclosed Value $ 11,538,799
Brown Brothers Harriman & Co reports 7.48% increase in ownership of AWK / American Water Works Company, Inc.

On May 14, 2026 - Brown Brothers Harriman & Co filed a 13F-HR form disclosing ownership of 84,788 shares of American Water Works Company, Inc. (MX:AWK) valued at $11,538,799 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 78,884 shares of American Water Works Company, Inc.. This represents a change in shares of 7.48% 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)
2026-05-14 2026-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 84,788 5,904 7.48 11,539 12.08 0.0619
2026-02-12 2025-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 78,884 2,301 3.00 10,294 -3.42 0.0561
2025-11-13 2025-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 76,583 -843 -1.09 10,660 -1.03 0.0649
2025-08-11 2025-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 77,426 412 0.53 10,771 -5.20 0.0692
2025-05-14 2025-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 77,014 -10,907 -12.41 11,361 3.80 0.0794
2025-02-12 2024-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 87,921 -16,981 -16.19 10,945 -28.65 0.0767
2024-11-13 2024-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 104,902 -18,905 -15.27 15,341 -4.07 0.1043
2024-08-09 2024-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 123,807 -24,290 -16.40 15,991 -11.65 0.1204
2024-05-10 2024-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 148,097 46,132 45.24 18,099 34.48 0.1391
2024-02-12 2023-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 101,965 98,806 3,127.76 13,458 3,341.94 0.1119
2023-11-13 2023-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 3,159 -170 -5.11 391 -17.68 0.0035
2023-08-07 2023-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 3,329 459 15.99 475 13.10 0.0038
2023-05-11 2023-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,870 -213 -6.91 420 -10.45 0.0035
2023-02-09 2022-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 3,083 -303 -8.95 470 6.35 0.0041
2022-11-14 2022-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 3,386 1,173 53.00 441 34.04 0.0041
2022-08-11 2022-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,213 27 1.24 329 -9.12 0.0028
2022-05-13 2022-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,186 392 21.85 362 6.78 0.0026
2022-02-14 2021-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 1,794 274 18.03 339 31.91 0.0019
2021-11-15 2021-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 1,520 0 0.00 257 9.83 0.0015
2021-08-13 2021-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 1,520 -207 -11.99 234 -9.65 0.0014
2021-05-13 2021-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 1,727 -644 -27.16 259 -28.85 0.0016
2021-02-16 2020-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,371 -281 -10.60 364 -5.21 0.0024
2020-11-16 2020-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,652 0 0.00 384 12.61 0.0028
2020-08-13 2020-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,652 91 3.55 341 11.44 0.0026
2020-05-15 2020-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,561 106 4.32 306 1.32 0.0025
2020-02-14 2019-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,455 -290 -10.56 302 -11.44 0.0019
2019-11-14 2019-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,745 25 0.92 341 7.91 0.0023
2019-08-14 2019-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,720 -140 -4.90 316 6.04 0.0021
2019-05-15 2019-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,860 -390 -12.00 298 1.02 0.0021
2019-02-14 2018-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 3,250 268 8.99 295 12.60 0.0022
2018-11-14 2018-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,982 39 1.33 262 4.38 0.0017
2018-08-14 2018-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,943 578 24.44 251 29.38 0.0015
2018-05-14 2018-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,365 -1,105 -31.84 194 -38.80 0.0011
2018-02-14 2017-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 3,470 405 13.21 317 27.82 0.0017
2017-11-14 2017-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 3,065 50 1.66 248 5.53 0.0013
2017-08-14 2017-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 3,015 -36 -1.18 235 -0.84 0.0013
2017-05-12 2017-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 3,051 538 21.41 237 30.22 0.0013
2017-02-14 2016-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,513 150 6.35 182 2.82 0.0010
2016-11-14 2016-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,363 0 0.00 177 -11.50 0.0009
2016-08-15 2016-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,363 -160 -6.34 200 14.94 0.0010
2016-05-13 2016-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,523 0 0.00 174 15.23 0.0009
2016-02-12 2015-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,523 0 0.00 151 8.63 0.0008
2015-11-13 2015-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,523 0 0.00 139 13.01 0.0007
2015-08-14 2015-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 2,523 0 0.00 123 -10.22 0.0006
2015-05-15 2015-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 2,523 -724 -22.30 137 -20.81 0.0006
2015-02-13 2014-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 3,247 -3,425 -51.33 173 -46.27 0.0007
2014-11-14 2014-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 6,672 865 14.90 322 12.20 0.0013
2014-08-15 2014-06-30 13F AMERICAN WATER WORKS Common Stock 030420103 5,807 -80 -1.36 287 7.49 0.0012
2014-05-15 2014-03-31 13F AMERICAN WATER WORKS Common Stock 030420103 5,887 4,450 309.67 267 337.70 0.0011
2014-05-13 2013-12-31 13F/A-2 AMERICAN WATER WORKS Common Stock 030420103 1,437 1,262 721.14 61 771.43 0.0003
2014-02-12 2013-12-31 13F AMERICAN WATER WORKS Common Stock 030420103 1,437 61
2013-11-14 2013-09-30 13F AMERICAN WATER WORKS Common Stock 030420103 175 -10,025 -98.28 7 -98.34 0.0000
2013-08-12 2013-06-30 13F AMERICAN WATER WORKS Common 030420103 10,200 -53,000 -83.86 421 -83.93 0.0020
2013-05-23 2013-03-31 13F/A-1 AMERICAN WATER WORKS Common 030420103 63,200 63,200 2,619 0.0135
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.