ALLEGHENY TECHNOLOGIES INC

Ticker: ATI CUSIP: 01741R102 Class: EQTY

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND's Holding History (CIK: 0001535845)

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

Q4 2025

Shares 53,462 Value ($000) $6,135 Avg Close $97.45 Range $79.29 - $117.48

Q3 2025

Shares 36,562 Value ($000) $2,974 Avg Close $81.04 Range $70.42 - $96.20

Q4 2024

Shares 24,031 Value ($000) $1,323 Avg Close $58.97 Range $52.45 - $67.09

Q4 2023

Shares 50,000 Value ($000) $2,274 Avg Close $41.52 Range $35.03 - $46.57

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	53,462	$6,135	$97.45	$79.29 - $117.48
Q3 2025	36,562	$2,974	$81.04	$70.42 - $96.20
Q4 2024	24,031	$1,323	$58.97	$52.45 - $67.09
Q4 2023	50,000	$2,274	$41.52	$35.03 - $46.57