Argentarii, LLC NPWR — NET POWER INC

Ownership history in Argentarii, LLC  ·  6 quarters on record

AI Ownership Summary

Argentarii, LLC reported NET POWER INC (NPWR) in 6 quarterly 13F filings from 2024 Q4 through 2026 Q1. Peak portfolio weight reached 0.41% in 2026 Q1. The latest visible filing shows NPWR at 0.41% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this NPWR ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Argentarii, LLC's position in NET POWER INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q1

NPWR was reported at 0.41% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.41% in 2026 Q1

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q4 to 2026 Q1

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

NPWR stock page Argentarii, LLC fund profile Argentarii, LLC full holdings
How Argentarii, LLC held NPWR — position size vs. price
% of Fund (quarterly)    NPWR price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 6 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 748,649 +485,142 +184.1% 0.41% $1.2M 2026-05-12 $2.48
2025 Q4 ADDED — — — 263,507 +212,142 +413.0% 0.20% $601K 2026-01-13 $2.82
2025 Q3 ADDED — — — 51,365 +24,580 +91.8% 0.06% $155K 2025-10-27 $3.69
2025 Q2 REDUCED — — — 26,785 -500 -1.8% 0.03% $66K 2025-07-14 $3.16
2025 Q1 ADDED — — — 27,285 +3,842 +16.4% 0.04% $72K 2025-04-29 $1.71
2024 Q4 INITIATED — — — 23,443 — — 0.12% $248K 2025-02-07 $8.32

🏢 Other funds also holding NPWR

As of 2026 Q1 — sorted by position size

Share Andrew L. 3Y 7Y 7.11% HITE Hedge Asset Management LLC 3Y 7Y 0.24% Sourcerock Group LLC 3Y 0.09% CenterBook Partners LP 3Y 0.04% GSA CAPITAL PARTNERS LLP 3Y 7Y 0.02% SIR Capital Management, L.P. 3Y 7Y 0.02% Kapstone Financial Advisors LLC 3Y 0.01% OXFORD ASSET MANAGEMENT LLP 3Y 7Y 0.01% Defiance ETFs, LLC 0.01% SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 3Y 7Y 0.01%

FAQ About Argentarii, LLC and NPWR

These are the practical questions this page is built to answer before you even open the full history table.

How long has Argentarii, LLC reported owning NPWR?

Argentarii, LLC reported NPWR across 6 quarterly 13F filings, from 2024 Q4 through 2026 Q1.

What was the largest reported NPWR position in Argentarii, LLC's portfolio?

The largest reported portfolio weight for NPWR was 0.41% in 2026 Q1.

What is the latest reported NPWR position on this page?

The most recent filing on this page is 2026 Q1, when Argentarii, LLC reported 748,649 shares, equal to 0.41% of portfolio, with an estimated market value of $1.2M.

What does the chart on this NPWR ownership page compare?

The chart compares Argentarii, LLC's quarterly NPWR portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did Argentarii, LLC time their NPWR position?

Based on 13F filing dates vs. subsequent NPWR price moves, Argentarii, LLC correctly timed 1 out of 5 reported position changes (20%). The annualised alpha on NPWR relative to SPY over the holding period was -68.0%.

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