Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in NPWR held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Share Andrew L. | 9.8M | $15.2M | 0.0% | 11.534% | 7.11% |
| 2 | HITE Hedge Asset Management LLC | 2.8M | $4.3M | +268.9% | 3.263% | 0.24% |
| 3 | BlackRock, Inc. | 2.1M | $3.3M | +7.4% | 2.530% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.6M | $2.6M | — | 1.941% | 0.00% |
| 5 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1.5M | $2.4M | 0.0% | 1.818% | 0.00% |
| 6 | Sourcerock Group LLC | 1.5M | $2.3M | +0.5% | 1.776% | 0.09% |
| 7 | TWO SIGMA INVESTMENTS, LP | 1.1M | $1.7M | +48.3% | 1.276% | 0.00% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 860K | $1.3M | +3.5% | 1.016% | 0.00% |
| 9 | Argentarii, LLC | 749K | $1.2M | +184.1% | 0.884% | 0.41% |
| 10 | Nuveen, LLC | 714K | $1.1M | +1.6% | 0.843% | 0.00% |
| 11 | RENAISSANCE TECHNOLOGIES LLC | 704K | $1.1M | +644.0% | 0.831% | 0.00% |
| 12 | MILLENNIUM MANAGEMENT LLC | 683K | $1.1M | -70.0% | 0.806% | 0.00% |
| 13 | STATE STREET CORP | 614K | $957K | +1.6% | 0.724% | 0.00% |
| 14 | Defiance ETFs, LLC | 533K | $832K | — | 0.630% | 0.01% |
| 15 | CenterBook Partners LP | 438K | $683K | -76.3% | 0.517% | 0.04% |
| 16 | TUDOR INVESTMENT CORP ET AL | 431K | $673K | +407.9% | 0.509% | 0.00% |
| 17 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 430K | $671K | -5.9% | 0.508% | 0.00% |
| 18 | UBS Group AG | 370K | $577K | +473.5% | 0.437% | 0.00% |
| 19 | BOOTHBAY FUND MANAGEMENT, LLC | 296K | $462K | -1.5% | 0.349% | 0.01% |
| 20 | NORTHERN TRUST CORP | 292K | $456K | +15.0% | 0.345% | 0.00% |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 270K | $420K | +0.5% | 0.318% | 0.00% |
| 22 | VANGUARD PORTFOLIO MANAGEMENT LLC | 265K | $413K | — | 0.313% | 0.00% |
| 23 | GOLDMAN SACHS GROUP INC | 261K | $406K | -14.2% | 0.308% | 0.00% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 249K | $388K | — | 0.294% | 0.00% |
| 25 | FEDERATED HERMES, INC. | 242K | $377K | +205.7% | 0.285% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in NPWR — a direct measure of their conviction.
Filings activity in NPWR during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 107 | 4.5% | 34.12% | 16.41 pp | $49M | 32% |
| Q4 2025 | 112 | +13% | 50.53% | 16.39 pp | $73M | 24% |
| Q3 2025 | 99 | +4.2% | 66.92% | +16.56 pp | $96M | +33% |
| Q2 2025 | 95 | 10% | 50.36% | 3.27 pp | $72M | 6.1% |
| Q1 2025 | 106 | 2.8% | 53.63% | 146.36 pp | $77M | 74% |
| Q4 2024 | 109 | +25% | 199.99% | +58.65 pp | $301M | +48% |
| Q3 2024 | 87 | 3.3% | 141.34% | 51.73 pp | $203M | 27% |
| Q2 2024 | 90 | — | 193.07% | — | $278M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying NPWR stock.
Based on Q1 2026 13F filings, institutional ownership of NET Power Inc. stands at 34.1%, held across 107 reporting institutions.
Share Andrew L. is the largest reported institutional holder of NPWR, with approximately 9,767,500 shares worth $0.02B as of Q1 2026.
Yes — 4 widely-followed marquee investors appear among the top 25 institutional holders of NPWR, including TWO SIGMA INVESTMENTS, LP, RENAISSANCE TECHNOLOGIES LLC, MILLENNIUM MANAGEMENT LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for NPWR is 45 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
18 institutions opened new positions in NPWR during Q1 2026, while 23 fully exited. 20 added to existing positions and 67 trimmed.
NPWR institutional ownership fell by 16.41 percentage points quarter-over-quarter, with a net change of -5 holders.
The top 10 institutions account for 72.3% of all reported 13F value in NPWR, and the top 25 account for 91.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
NET Power Inc. (NPWR) Institutional Ownership