AFFILIATED MANAGERS GROUP

Ticker: AMG CUSIP: 008252108 Class: COM

Optiver Holding B.V.'s Holding History (CIK: 0001859606)

Note: Option positions (PUT/CALL) are excluded.

Q3 2025

Shares 52 Value ($000) $12 Avg Close $220.39 Range $194.74 - $250.14

Q2 2025

Shares 27 Value ($000) $5 Avg Close $173.47 Range $139.20 - $199.47

Q1 2025

Shares 34 Value ($000) $6 Avg Close $174.30 Range $151.61 - $191.09

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2025	52	$12	$220.39	$194.74 - $250.14
Q2 2025	27	$5	$173.47	$139.20 - $199.47
Q1 2025	34	$6	$174.30	$151.61 - $191.09