William Blair Investment Management
LB

William Blair Investment Management’s LandBridge Co LB Stock Holding History

William Blair Investment Management’s Portfolio LB Stock Details LB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$97.9M Buy
1,235,265
+347,799
+39% +$23.9M 0.29% 102
2026
Q1 		$61.3M Buy
887,466
+197,175
+29% +$12.5M 0.2% 120
2025
Q4 		$33.8M Buy
+690,291
New +$40.1M 0.09% 181

Other funds holding LB

First Manhattan
First Manhattan New York $39.2B AUM 21.04% 1-Year Est. Return
HKAM
Horizon Kinetics Asset Management New York $8.82B AUM 23.05% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
SIC
Schwartz Investment Counsel Plymouth, Michigan $3.01B AUM 27.22% 1-Year Est. Return
HRCM
Hood River Capital Management Palm Beach Gardens, Florida $13.8B AUM 163.97% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
DDC
DF Dent & Co Baltimore, Maryland $5.27B AUM 7.89% 1-Year Est. Return

William Blair Investment Management's LB Position: Q2 2026 in Review

William Blair Investment Management increased its LandBridge Co (LB) stake by 39% in Q2 2026, buying an estimated $23.9M and bringing the position to 1,235,265 shares worth $97.9M. The position accounts for 0.29% of the portfolio, ranked #102.

William Blair Investment Management first reported a position in LB in Q4 2025 and has held it in 3 quarters since. 193 funds tracked by Wall St. Rank hold LB as of Q2 2026.

  • William Blair Investment Management held 1,235,265 shares of LandBridge Co worth $97.9M as of Q2 2026.
  • William Blair Investment Management bought 347,799 LandBridge Co shares in Q2 2026, an estimated $23.9M.
  • LandBridge Co made up 0.29% of William Blair Investment Management's portfolio in Q2 2026, its #102 holding.
  • William Blair Investment Management first reported a position in LandBridge Co in Q4 2025 and has held it in 3 quarters since.
  • 193 funds tracked by Wall St. Rank held LandBridge Co as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.