ONTO INNOVATION INC

Ticker: ONTO CUSIP: 683344105 Class: EQTY

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q4 2025

Shares 483,082 Value ($000) $76,259 Avg Close $142.02 Range $118.97 - $171.32

Q3 2025

Shares 474,530 Value ($000) $61,319 Avg Close $107.03 Range $89.40 - $142.77

Q2 2025

Shares 351,064 Value ($000) $35,433 Avg Close $106.80 Range $85.88 - $136.24

Q1 2025

Shares 203,566 Value ($000) $24,701 Avg Close $168.38 Range $116.16 - $228.42

Q4 2024

Shares 280,183 Value ($000) $46,698 Avg Close $182.71 Range $156.88 - $226.73

Q2 2023

Shares 226,199 Value ($000) $26,345 Avg Close $95.40 Range $76.40 - $117.99

Q1 2023

Shares 302,013 Value ($000) $26,541 Avg Close $81.11 Range $67.55 - $89.75

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	483,082	$76,259	$142.02	$118.97 - $171.32
Q3 2025	474,530	$61,319	$107.03	$89.40 - $142.77
Q2 2025	351,064	$35,433	$106.80	$85.88 - $136.24
Q1 2025	203,566	$24,701	$168.38	$116.16 - $228.42
Q4 2024	280,183	$46,698	$182.71	$156.88 - $226.73
Q2 2023	226,199	$26,345	$95.40	$76.40 - $117.99
Q1 2023	302,013	$26,541	$81.11	$67.55 - $89.75