Mad River Investors’s LandBridge Co LB Stock Holding History

Mad River Investors’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	$21.2M	Buy	267,953 +1,568	+0.6%	+$108K	7.92%	3
2026 Q1	$18.4M	Buy	266,385 +3,451	+1%	+$219K	6.62%	5
2025 Q4	$12.9M	Buy	262,934 +21,878	+9%	+$1.27M	5.87%	5
2025 Q3	$12.9M	Buy	241,056 +6,302	+3%	+$348K	5.5%	5
2025 Q2	$15.9M	Buy	234,754 +501	+0.2%	+$36.1K	7.11%	3
2025 Q1	$16.9M	Buy	234,253 +801	+0.3%	+$56.7K	7.14%	3
2024 Q4	$15.1M	Buy	233,452 +902	+0.4%	+$54.2K	7.01%	3
2024 Q3	$9.1M	Buy	+232,550	New	+$7.83M	5.05%	3

Other funds holding LB

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

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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

William Blair Investment Management Chicago, Illinois $33.3B AUM 44.76% 1-Year Est. Return

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 Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Mad River Investors's LB Position: Q2 2026 in Review

Mad River Investors increased its LandBridge Co (LB) stake by 0.59% in Q2 2026, buying an estimated $108K and bringing the position to 267,953 shares worth $21.2M. The position accounts for 7.92% of the portfolio, ranked #3.

Mad River Investors first reported a position in LB in Q3 2024 and has held it in 8 quarters since. 193 funds tracked by Wall St. Rank hold LB as of Q2 2026.

Mad River Investors held 267,953 shares of LandBridge Co worth $21.2M as of Q2 2026.
Mad River Investors bought 1,568 LandBridge Co shares in Q2 2026, an estimated $108K.
LandBridge Co made up 7.92% of Mad River Investors's portfolio in Q2 2026, its #3 holding.
Mad River Investors first reported a position in LandBridge Co in Q3 2024 and has held it in 8 quarters since.
193 funds tracked by Wall St. Rank held LandBridge Co as of Q2 2026.

Based on Mad River Investors's 13F filing for Q2 2026, filed 3 Aug 2026.