Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in HTOO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | 18K | $47K | — | 0.977% | 0.00% |
| 2 | UBS Group AG | 3K | $8K | -21.9% | 0.161% | 0.00% |
| 3 | MORGAN STANLEY | 1K | $3K | 0.0% | 0.056% | 0.00% |
| 4 | SBI Securities Co., Ltd. | 99 | $262 | 0.0% | 0.006% | 0.00% |
| 5 | Ameritas Advisory Services, LLC | 15 | $40 | — | 0.001% | 0.00% |
| 6 | CREATIVE FINANCIAL DESIGNS INC /ADV | 11 | $29 | 0.0% | 0.001% | 0.00% |
| 7 | NATIONAL BANK OF CANADA /FI/ | 7 | $19 | 0.0% | 0.000% | 0.00% |
| 8 | ASSETMARK, INC | 6 | $16 | — | 0.000% | 0.00% |
| 9 | JONES FINANCIAL COMPANIES LLLP | 3 | $8 | 0.0% | 0.000% | 0.00% |
| 10 | GROUP ONE TRADING LLC | 1 | $3 | 0.0% | 0.000% | 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 HTOO — a direct measure of their conviction.
Filings activity in HTOO during Q2 2026, grouped by how each filer changed its position.
No institutions added to their position this quarter.
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 |
|---|---|---|---|---|---|---|
| Q2 2026 | 10 | +25% | 1.20% | +0.93 pp | $0M | +323% |
| Q1 2026 | 8 | 20% | 0.27% | +0.04 pp | $0M | +0.5% |
| Q4 2025 | 10 | 23% | 0.23% | +0.18 pp | $0M | +233% |
| Q3 2025 | 13 | 13% | 0.05% | 0.52 pp | $0M | 94% |
| Q2 2025 | 15 | 6.3% | 0.57% | +0.27 pp | $0M | +47% |
| Q1 2025 | 16 | 16% | 0.30% | 0.29 pp | $0M | 77% |
| Q4 2024 | 19 | 9.5% | 0.59% | 3.77 pp | $0M | 85% |
| Q3 2024 | 21 | — | 4.36% | — | $1M | — |
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 HTOO stock.
Based on Q2 2026 13F filings, institutional ownership of Fusion Fuel Green PLC stands at 1.2%, held across 10 reporting institutions.
CITADEL ADVISORS LLC is the largest reported institutional holder of HTOO, with approximately 17,682 shares worth $0.00B as of Q2 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of HTOO, including CITADEL ADVISORS LLC.
Our composite Smart Money Score for HTOO is 63 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
3 institutions opened new positions in HTOO during Q2 2026, while 1 fully exited. 0 added to existing positions and 4 trimmed.
HTOO institutional ownership rose by 0.93 percentage points quarter-over-quarter, with a net change of +2 holders.
The top 10 institutions account for 100.0% of all reported 13F value in HTOO, and the top 25 account for 100.0%.
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.
Fusion Fuel Green PLC (HTOO) Institutional Ownership