Arrowstreet had Part 1 and brochure observations; 150 daily firm filing observations

Arrowstreet Capital, Limited Partnership had Part 1 and Part 2 brochure filing observations on October 9, 2026. Across October 9 through October 11, the period included 150 daily firm filing observations.

The period also included 83 Part 2 brochure observations and 58 client relationship summary observations. The category counts overlap, so they should not be added to derive the total. October 9 is the observation date, not necessarily the submission or processing date; an observed category does not establish that document content changed.

ADV filing observations

The appendix lists all 150 daily firm filing observations from 10/09/2026 through 10/11/2026. An observation can include multiple document categories and does not by itself prove a substantive document change.