American Water Works Company, Inc.
MX ˙ BMV ˙ US0304201033
SecurityMX:AWK / American Water Works Company, Inc.
InstitutionCalifornia State Teachers Retirement System
Latest Disclosed Ownership572,001 shares
Latest Disclosed Value $ 77,843,616
California State Teachers Retirement System reports 1.97% decrease in ownership of AWK / American Water Works Company, Inc.

On May 15, 2026 - California State Teachers Retirement System filed a 13F-HR form disclosing ownership of 572,001 shares of American Water Works Company, Inc. (MX:AWK) valued at $77,843,616 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 583,515 shares of American Water Works Company, Inc.. This represents a change in shares of -1.97% 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)
2026-05-15 2026-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 572,001 -11,514 -1.97 77,844 2.23 0.0824
2026-02-17 2025-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 583,515 10,738 1.87 76,149 -4.49 0.0762
2025-11-14 2025-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 572,777 27,682 5.08 79,725 5.14 0.0818
2025-08-14 2025-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 545,095 -70,065 -11.39 75,828 -16.44 0.0842
2025-05-15 2025-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 615,160 -10,391 -1.66 90,748 16.53 0.1122
2025-03-18 2024-12-31 13F/A-1 AMERICAN WATER WORKS COMMON STOCK 030420103 625,551 125,474 25.09 77,875 6.49 0.0909
2025-02-14 2024-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 625,551 125,474 77,875 0.1124
2025-04-04 2024-09-30 13F/A-1 AMERICAN WATER WORKS COMMON STOCK 030420103 500,077 37,880 8.20 73,131 22.50 0.0853
2024-11-14 2024-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 500,077 37,880 73,131 0.1025
2025-04-08 2024-06-30 13F/A-1 AMERICAN WATER WORKS COMMON STOCK 030420103 462,197 41,234 9.80 59,697 16.04 0.0732
2024-08-14 2024-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 462,197 41,234 59,697 0.0873
2024-05-16 2024-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 420,963 29,100 7.43 51,446 -0.53 0.0650
2024-02-13 2023-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 391,863 41,533 11.86 51,722 19.23 0.0713
2023-11-14 2023-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 350,330 3,113 0.90 43,381 -12.48 0.0667
2023-08-21 2023-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 347,217 475 0.14 49,565 -2.42 0.0700
2023-05-09 2023-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 346,742 14,410 4.34 50,794 0.28 0.0756
2023-02-14 2022-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 332,332 3,644 1.11 50,654 18.40 0.0796
2022-11-21 2022-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 328,688 -1,484 -0.45 42,782 -12.90 0.0723
2022-08-15 2022-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 330,172 4,975 1.53 49,120 -8.75 0.0777
2022-05-16 2022-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 325,197 -15,368 -4.51 53,830 -16.31 0.0709
2022-02-15 2021-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 340,565 7,628 2.29 64,319 14.28 0.0752
2021-11-15 2021-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 332,937 -4,068 -1.21 56,280 8.35 0.0723
2021-08-16 2021-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 337,005 -33,448 -9.03 51,943 -6.47 0.0652
2021-05-18 2021-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 370,453 19,065 5.43 55,538 2.99 0.0734
2021-02-16 2020-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 351,388 -975 -0.28 53,928 5.64 0.0754
2020-11-17 2020-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 352,363 6,408 1.85 51,050 14.69 0.0820
2020-08-17 2020-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 345,955 -21,565 -5.87 44,511 1.30 0.0784
2020-05-13 2020-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 367,520 20,983 6.06 43,941 3.22 0.0946
2020-02-14 2019-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 346,537 -13,147 -3.66 42,572 -4.73 0.0724
2019-11-15 2019-09-30 13F/A-1 AMERICAN WATER WORKS COMMON STOCK 030420103 359,684 1,397 0.39 44,684 7.51 0.0872
2019-11-14 2019-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 358,287 0 41,561 81,896.3765
2019-08-14 2019-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 358,287 468 0.13 41,561 11.41 0.0820
2019-05-09 2019-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 357,819 -6,001 -1.65 37,306 12.97 0.0764
2019-02-13 2018-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 363,820 24,219 7.13 33,024 10.54 0.0751
2018-11-14 2018-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 339,601 4,250 1.27 29,875 4.34 0.0581
2018-08-14 2018-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 335,351 -6,336 -1.85 28,632 2.03 0.0596
2018-05-15 2018-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 341,687 -9,046 -2.58 28,063 -12.55 0.0601
2018-02-14 2017-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 350,733 -1,575 -0.45 32,089 12.57 0.0660
2017-11-13 2017-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 352,308 -26,807 -7.07 28,505 -3.54 0.0631
2017-08-15 2017-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 379,115 13,913 3.81 29,552 4.05 0.0630
2017-05-12 2017-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 365,202 -16,100 -4.22 28,402 2.94 0.0574
2017-02-14 2016-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 381,302 -9,900 -2.53 27,591 -5.76 0.0562
2016-11-09 2016-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 391,202 3,300 0.85 29,278 -10.69 0.0604
2016-08-01 2016-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 387,902 -5,361 -1.36 32,782 20.93 0.0706
2016-05-16 2016-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 393,263 49,194 14.30 27,108 31.86 0.0578
2016-01-29 2015-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 344,069 5,404 1.60 20,558 10.21 0.0501
2015-10-30 2015-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 338,665 9,988 3.04 18,654 16.70 0.0486
2015-08-03 2015-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 328,677 -9,806 -2.90 15,984 -12.89 0.0386
2015-05-07 2015-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 338,483 -5,595 -1.63 18,349 0.05 0.0435
2015-02-11 2014-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 344,078 3,161 0.93 18,339 11.54 0.0430
2014-11-10 2014-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 340,917 14,056 4.30 16,442 1.73 0.0407
2014-08-13 2014-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 326,861 3,600 1.11 16,163 10.13 0.0406
2014-05-08 2014-03-31 13F/A-1 AMERICAN WATER WORKS COMMON STOCK 030420103 323,261 1,500 0.47 14,676 7.93 0.0388
2014-05-05 2014-03-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 323,261 14,676
2014-02-10 2013-12-31 13F AMERICAN WATER WORKS COMMON STOCK 030420103 321,761 2,300 0.72 13,598 3.12 0.0368
2013-11-18 2013-09-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 319,461 9,803 3.17 13,187 3.29 0.0392
2013-07-29 2013-06-30 13F AMERICAN WATER WORKS COMMON STOCK 030420103 309,658 3,300 1.08 12,767 0.57 0.0415
2013-07-24 2013-03-31 13F/A-1 AMERICAN WATER WORKS COMMON STOCK 030420103 306,358 306,358 12,695 0.0426
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.