Portolan Capital Management’s Onto Innovation ONTO Stock Holding History

Portolan Capital Management’s Portfolio ONTO Stock Details ONTO Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$13.8M	Buy	36,503 +14,240	+64%	+$4.03M	0.52%	68
2026 Q1	$4.57M	Buy	+22,263	New	+$4.56M	0.24%	104
2025 Q4	–	Sell	-44,564	Closed	-$5.76M	–	165
2025 Q3	$5.76M	Buy	+44,564	New	+$4.77M	0.31%	89
2023 Q4	–	Sell	-50,367	Closed	-$6.42M	–	151
2023 Q3	$6.42M	Buy	+50,367	New	+$5.99M	0.6%	53

Other funds holding ONTO

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

PCMI

Paradigm Capital Management Inc Albany, New York $3.67B AUM 121.12% 1-Year Est. Return

Point72 Asset Management Stamford, Connecticut $90.7B AUM 77.13% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Portolan Capital Management's ONTO Position: Q2 2026 in Review

Portolan Capital Management increased its Onto Innovation (ONTO) stake by 64% in Q2 2026, buying an estimated $4.03M and bringing the position to 36,503 shares worth $13.8M. The position accounts for 0.52% of the portfolio, ranked #68.

Portolan Capital Management first reported a position in ONTO in Q3 2023 and has held it in 4 quarters since. 690 funds tracked by Wall St. Rank hold ONTO as of Q2 2026.

Portolan Capital Management held 36,503 shares of Onto Innovation worth $13.8M as of Q2 2026.
Portolan Capital Management bought 14,240 Onto Innovation shares in Q2 2026, an estimated $4.03M.
Onto Innovation made up 0.52% of Portolan Capital Management's portfolio in Q2 2026, its #68 holding.
Portolan Capital Management first reported a position in Onto Innovation in Q3 2023 and has held it in 4 quarters since.
690 funds tracked by Wall St. Rank held Onto Innovation as of Q2 2026.

Based on Portolan Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.