Transaction Details

Footnotes

The shares indicated constitute units that settle solely in the common stock of American Water Works Company, Inc. (the "Company") on a one-share-per-unit basis. The stock units vested on the date of grant and will be converted immediately into shares of Company common stock. | Includes 178 shares acquired pursuant to the automatic reinvestment in shares of common stock of American Water Works Company, Inc. (the "Company") of cash dividends paid on Company common stock to the reporting person, received since the reporting person's last Form 4 report, which acquisitions are exempt from Section 16 of the Securities Exchange Act of 1934, as amended, pursuant to Rule 16a-11 thereunder.