Driehaus Capital Management’s Patterson-UTI PTEN Stock Holding History

Driehaus Capital Management’s Portfolio PTEN Stock Details PTEN Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$27.7M	Buy	+2,559,637	New	+$21.9M	0.2%	159
2023 Q1	–	Sell	-468,889	Closed	-$7.9M	–	430
2022 Q4	$7.9M	Buy	+468,889	New	+$7.74M	0.12%	236
2022 Q3	–	Sell	-1,183,204	Closed	-$18.6M	–	393
2022 Q2	$18.6M	Sell	1,183,204 -391,469	-25%	-$6.57M	0.3%	111
2022 Q1	$24.4M	Buy	+1,574,673	New	+$19.9M	0.3%	116
2017 Q1	–	Sell	-38,468	Closed	-$1.04M	–	602
2016 Q4	$1.04M	Buy	+38,468	New	+$950K	0.04%	347

Other funds holding PTEN

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

Sourcerock Group Denver, Colorado $2.48B AUM 72.25% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return

Driehaus Capital Management's PTEN Position: Q1 2026 in Review

Driehaus Capital Management opened a new position in Patterson-UTI (PTEN) in Q1 2026: 2,559,637 shares worth $27.7M. The stake represents 0.2% of the portfolio and ranks #159 among its holdings. This is a return to the name: Driehaus Capital Management previously reported a position in PTEN as recently as Q4 2022.

Driehaus Capital Management first reported a position in PTEN in Q4 2016 and has held it in 5 quarters since. 410 funds tracked by Wall St. Rank hold PTEN as of Q1 2026.

Driehaus Capital Management held 2,559,637 shares of Patterson-UTI worth $27.7M as of Q1 2026.
Patterson-UTI was a new Driehaus Capital Management position in Q1 2026.
Patterson-UTI made up 0.2% of Driehaus Capital Management's portfolio in Q1 2026, its #159 holding.
Driehaus Capital Management first reported a position in Patterson-UTI in Q4 2016 and has held it in 5 quarters since.
410 funds tracked by Wall St. Rank held Patterson-UTI as of Q1 2026.

Based on Driehaus Capital Management's 13F filing for Q1 2026, filed 15 May 2026.