Osterweis Capital Management’s Avantor AVTR Stock Holding History

Osterweis Capital Management’s Portfolio AVTR Stock Details AVTR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-1,886	Closed	-$25.4K	–	278
2025 Q2	$25.4K	Hold	1,886	–	–	﹤0.01%	256
2025 Q1	$30.6K	Hold	1,886	–	–	﹤0.01%	165
2024 Q4	$39.7K	Hold	1,886	–	–	﹤0.01%	179
2024 Q3	$48.8K	Hold	1,886	–	–	﹤0.01%	174
2024 Q2	$40K	Buy	1,886 +766	+68%	+$18.4K	﹤0.01%	180
2024 Q1	$28.6K	Buy	+1,120	New	+$26.6K	﹤0.01%	173
2023 Q4	–	Sell	-1,046,708	Closed	-$22.1M	–	198
2023 Q3	$22.1M	Buy	1,046,708 +139,243	+15%	+$2.96M	1.62%	27
2023 Q2	$18.6M	Buy	907,465 +78,970	+10%	+$1.6M	1.23%	31
2023 Q1	$17.5M	Sell	828,495 -19,485	-2%	-$444K	1.19%	32
2022 Q4	$17.9M	Buy	+847,980	New	+$17.6M	1.3%	30

Other funds holding AVTR

Dodge & Cox San Francisco, California $191B AUM 17.5% 1-Year Est. Return

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

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

Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $33B AUM 40.62% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

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

ECM

Engine Capital Management New York $1.03B AUM 4.33% 1-Year Est. Return

Greenhaven Associates Purchase, New York $8.66B AUM 17.37% 1-Year Est. Return

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

CCP

Clarkston Capital Partners Rochester, Michigan $1.18B AUM 0.37% 1-Year Est. Return

Osterweis Capital Management's AVTR Position: Q3 2025 in Review

Osterweis Capital Management sold out of Avantor (AVTR) in Q3 2025, closing a stake of 1,886 shares — an estimated $25.4K sold.

Osterweis Capital Management first reported a position in AVTR in Q4 2022 and held it in 10 quarters. The position peaked at $22.1M in Q3 2023. 466 funds tracked by Wall St. Rank hold AVTR as of Q3 2025.

Osterweis Capital Management reported no remaining Avantor position as of Q3 2025 after selling out during the quarter.
Osterweis Capital Management sold 1,886 Avantor shares in Q3 2025, an estimated $25.4K.
Osterweis Capital Management first reported a position in Avantor in Q4 2022 and held it in 10 quarters.
Osterweis Capital Management's Avantor position peaked at $22.1M in Q3 2023.
466 funds tracked by Wall St. Rank held Avantor as of Q3 2025.

Based on Osterweis Capital Management's 13F filing for Q3 2025, filed 14 Nov 2025.