S&CO Inc’s NET Power NPWR Stock Holding History

S&CO Inc’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
2025 Q3	–	Sell	-188,000	Closed	-$464K	–	228
2025 Q2	$464K	Sell	188,000 -47,930	-20%	-$101K	0.03%	171
2025 Q1	$620K	Sell	235,930 -105,475	-31%	-$744K	0.04%	165
2024 Q4	$3.62M	Buy	341,405 +89,500	+36%	+$877K	0.25%	86
2024 Q3	$1.76M	Buy	251,905 +50,805	+25%	+$427K	0.12%	122
2024 Q2	$1.98M	Hold	201,100	–	–	0.14%	112
2024 Q1	$2.29M	Buy	+201,100	New	+$1.82M	0.16%	103

Other funds holding NPWR

ALS

Andrew L. Share $214M AUM 14.75% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $64.8B AUM 42.7% 1-Year Est. Return

Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

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

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

CenterBook Partners Greenwich, Connecticut $1.86B AUM 24.52% 1-Year Est. Return

HHAM

HITE Hedge Asset Management Braintree, Massachusetts $1.77B AUM 38.67% 1-Year Est. Return

Cohen & Steers New York $57.6B AUM 8.03% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

S&CO Inc's NPWR Position: Q3 2025 in Review

S&CO Inc sold out of NET Power (NPWR) in Q3 2025, closing a stake of 188,000 shares — an estimated $464K sold.

S&CO Inc first reported a position in NPWR in Q1 2024 and held it in 6 quarters. The position peaked at $3.62M in Q4 2024. 100 funds tracked by Wall St. Rank hold NPWR as of Q3 2025.

S&CO Inc reported no remaining NET Power position as of Q3 2025 after selling out during the quarter.
S&CO Inc sold 188,000 NET Power shares in Q3 2025, an estimated $464K.
S&CO Inc first reported a position in NET Power in Q1 2024 and held it in 6 quarters.
S&CO Inc's NET Power position peaked at $3.62M in Q4 2024.
100 funds tracked by Wall St. Rank held NET Power as of Q3 2025.

Based on S&CO Inc's 13F filing for Q3 2025, filed 6 Nov 2025.