Mariner
NPWR icon

Mariner’s NET Power NPWR Stock Holding History

Mariner’s Portfolio NPWR Stock Details NPWR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$31K Buy
+18,552
New +$33.6K ﹤0.01% 3455
2025
Q1 		– Sell
-13,120
Closed -$139K – 3543
2024
Q4 		$139K Buy
+13,120
New +$129K ﹤0.01% 3109

Other funds holding NPWR

ALS
Andrew L. Share $193M AUM 1.47% 1-Year Est. Return
HHAM
HITE Hedge Asset Management Braintree, Massachusetts $1.83B AUM 34.36% 1-Year Est. Return
Adage Capital Partners
Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
PEAK6
PEAK6 Chicago, Illinois $48.6B AUM 40.56% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
DE
Defiance ETFs New York $7.37B AUM
TI
Tidal Investments Milwaukee, Wisconsin $57.8B AUM 72.54% 1-Year Est. Return
SG
Sourcerock Group Denver, Colorado $1.92B AUM 45.54% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Mariner's NPWR Position: Q2 2026 in Review

Mariner opened a new position in NET Power (NPWR) in Q2 2026: 18,552 shares worth $31K. The stake represents ﹤0.01% of the portfolio and ranks #3455 among its holdings. This is a return to the name: Mariner previously reported a position in NPWR as recently as Q4 2024.

Mariner first reported a position in NPWR in Q4 2024 and has held it in 2 quarters since. The position peaked at $139K in Q4 2024. 121 funds tracked by Wall St. Rank hold NPWR as of Q2 2026.

  • Mariner held 18,552 shares of NET Power worth $31K as of Q2 2026.
  • NET Power was a new Mariner position in Q2 2026.
  • NET Power made up ﹤0.01% of Mariner's portfolio in Q2 2026, its #3455 holding.
  • Mariner first reported a position in NET Power in Q4 2024 and has held it in 2 quarters since.
  • Mariner's NET Power position peaked at $139K in Q4 2024.
  • 121 funds tracked by Wall St. Rank held NET Power as of Q2 2026.

Based on Mariner's 13F filing for Q2 2026, filed 13 Aug 2026.