William Blair & Company
LB

William Blair & Company’s LandBridge Co LB Stock Holding History

William Blair & Company’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
Q1 		$868K Buy
12,576
+101
+0.8% +$6.42K ﹤0.01% 982
2025
Q4 		$611K Buy
12,475
+1,875
+18% +$109K ﹤0.01% 1071
2025
Q3 		$566K Buy
+10,600
New +$585K ﹤0.01% 1076

Other funds holding LB

First Manhattan
First Manhattan New York $36.1B AUM 11.5% 1-Year Est. Return
HKAM
Horizon Kinetics Asset Management New York $9.23B AUM 27.52% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
William Blair Investment Management
William Blair Investment Management Chicago, Illinois $30.3B AUM 33.75% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
HRCM
Hood River Capital Management Palm Beach Gardens, Florida $9.98B AUM 145.42% 1-Year Est. Return
SIC
Schwartz Investment Counsel Plymouth, Michigan $2.82B AUM 13.66% 1-Year Est. Return
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return

William Blair & Company's LB Position: Q1 2026 in Review

William Blair & Company increased its LandBridge Co (LB) stake by 0.81% in Q1 2026, buying an estimated $6.42K and bringing the position to 12,576 shares worth $868K. The position accounts for ﹤0.01% of the portfolio, ranked #982.

William Blair & Company first reported a position in LB in Q3 2025 and has held it in 3 quarters since. 187 funds tracked by Wall St. Rank hold LB as of Q1 2026.

  • William Blair & Company held 12,576 shares of LandBridge Co worth $868K as of Q1 2026.
  • William Blair & Company bought 101 LandBridge Co shares in Q1 2026, an estimated $6.42K.
  • LandBridge Co made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #982 holding.
  • William Blair & Company first reported a position in LandBridge Co in Q3 2025 and has held it in 3 quarters since.
  • 187 funds tracked by Wall St. Rank held LandBridge Co as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.