FUEL TECH INC FTEK
COM · Common Stock · CUSIP 359523107
- SectorIndustrials
- IndustryIndustrial & Commercial Fans & Blowers & Air Purifing Equip
- HeadquartersWarrenville, IL
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 31.2m as of 2026-07-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $2.21. Options: 0 managers hold calls (— notional), 1 hold puts ($221).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 37 |
| Q4 2022 | 42 |
| Q1 2023 | 38 |
| Q2 2023 | 41 |
| Q3 2023 | 39 |
| Q4 2023 | 37 |
| Q1 2024 | 34 |
| Q2 2024 | 35 |
| Q3 2024 | 37 |
| Q4 2024 | 40 |
| Q1 2025 | 36 |
| Q2 2025 | 37 |
| Q3 2025 | 48 |
| Q4 2025 | 45 |
| Q1 2026 | 46 |
| Q2 2026 | 43 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 16 | 7 |
| Q4 2024 | 16 | 9 |
| Q1 2025 | 15 | 16 |
| Q2 2025 | 15 | 16 |
| Q3 2025 | 27 | 13 |
| Q4 2025 | 22 | 20 |
| Q1 2026 | 14 | 20 |
| Q2 2026 | 16 | 17 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $930.2k | $59.0k | 0.06 |
| Q4 2025 | $141.3k | $37.1k | 0.26 |
| Q1 2026 | $0 | $36.2k | — |
| Q2 2026 | $0 | $221 | — |
Biggest buyers
| Peapod Lane Capital LLC | Added | +341.8k |
| Marquette Asset Management, LLC | New | +110.5k |
| BlackRock, Inc. | Added | +86.1k |
| THOMPSON DAVIS & CO., INC. | New | +85.8k |
| GSA CAPITAL PARTNERS LLP | Added | +48.9k |
| Rothschild Wealth LLC | New | +40.0k |
| JANE STREET GROUP, LLC | Added | +38.7k |
| NORTHERN TRUST CORP | Added | +28.9k |
| UBS Group AG | Added | +18.0k |
| VANGUARD CAPITAL MANAGEMENT LLC | Added | +17.7k |
Biggest sellers
| RENAISSANCE TECHNOLOGIES LLC | Reduced | -305.4k |
| CITADEL ADVISORS LLC | Reduced | -202.3k |
| XTX Topco Ltd | Sold out | -118.2k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | -104.2k |
| TWO SIGMA INVESTMENTS, LP | Reduced | -69.6k |
| Integrated Wealth Concepts LLC | Sold out | -35.0k |
| GROUP ONE TRADING LLC | Reduced | -26.3k |
| Cresset Asset Management, LLC | Sold out | -25.5k |
| MARSHALL WACE, LLP | Sold out | -21.8k |
| Chicago Partners Investment Group LLC | Sold out | -17.1k |
Biggest calls
| None |
Biggest puts
| SIMPLEX TRADING, LLC | New | $221100 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
No one currently above 5% in the filings since 19 Dec 2024.
Fell to 5% or below in the last year: GRACE & WHITE INC /NY (4.9%, 2026-10-07)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 1 | $50.1k | 0 | — | — |
| Q1 2025 | 1 | $15.8k | 0 | — | — |
| Q2 2025 | 0 | — | 1 | $21.1k | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 1 | $12.4k | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 1 | $2.0k | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-01 | Nuggihalli Ramesh President & CEO | Bought | $2.0k1.5k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| GRACE & WHITE INC /NY 0.54% of their portfolio | 1.5m $3.4m | Unchanged |
| RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio | 1.1m $2.4m | Reduced -305.4k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.0m $2.2m | Added +17.7k |
| Peapod Lane Capital LLC 1.22% of their portfolio | 820.6k $1.8m | Added +341.8k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 523.0k $1.2m | Reduced -9.8k |
| BlackRock, Inc. 0.00% of their portfolio | 496.5k $1.1m | Added +86.1k |
| US BANCORP \DE\ 0.00% of their portfolio | 304.8k $673.6k | Unchanged |
| GSA CAPITAL PARTNERS LLP 0.04% of their portfolio | 295.1k $652.0k | Added +48.9k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 168.5k $372.3k | Reduced -69.6k |
| Beartown Capital Management, LLC 0.14% of their portfolio | 146.7k $324.2k | Unchanged |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 133.5k $294.9k | Added +954 |
| STATE STREET CORP 0.00% of their portfolio | 121.8k $269.3k | Unchanged |
| Marquette Asset Management, LLC 0.03% of their portfolio | 110.5k $244.2k | New |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 109.5k $242.0k | Added +38.7k |
| THOMPSON DAVIS & CO., INC. 0.11% of their portfolio | 85.8k $189.6k | New |
| ESSEX INVESTMENT MANAGEMENT CO LLC 0.02% of their portfolio | 77.2k $170.5k | Reduced -91 |
| NORTHERN TRUST CORP 0.00% of their portfolio | 60.3k $133.3k | Added +28.9k |
| Rothschild Wealth LLC 0.01% of their portfolio | 40.0k $88.4k | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 35.9k $79.3k | Reduced -104.2k |
| LexAurum Advisors, LLC 0.01% of their portfolio | 20.2k $44.6k | Added +6.0k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 19.1k $42.1k | Reduced -202.3k |
| Legato Capital Management LLC 0.00% of their portfolio | 18.2k $40.1k | Unchanged |
| UBS Group AG 0.00% of their portfolio | 18.0k $39.8k | Added +18.0k |
| GROUP ONE TRADING LLC 0.00% of their portfolio | 13.9k $30.7k | Reduced -26.3k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 13.4k $29.1k | Reduced -6.0k |
| Covestor Ltd 0.02% of their portfolio | 12.4k $27.0k | Unchanged |
| HRT FINANCIAL LP 0.00% of their portfolio | 12.0k $26.0k | New |
| Scientech Research LLC 0.02% of their portfolio | 11.4k $25.3k | New |
| SIMPLEX TRADING, LLC 0.00% of their portfolio | 10.5k $23.2k | Added +9.5k |
| HighTower Advisors, LLC 0.00% of their portfolio | 10.4k $23.1k | Unchanged |
| Founders Capital Management 0.01% of their portfolio | 6.0k $13.3k | Unchanged |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 5.5k $12.2k | Unchanged |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 2.0k $4.5k | New |
| New England Capital Financial Advisors LLC 0.00% of their portfolio | 2.0k $4.4k | Unchanged |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 1.2k $2.7k | Unchanged |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 710 $1.6k | Unchanged |
| Steward Partners Investment Advisory, LLC 0.00% of their portfolio | 600 $1.3k | Unchanged |
| Wilmington Savings Fund Society, FSB 0.00% of their portfolio | 500 $1.1k | Unchanged |
| CKW FINANCIAL GROUP 0.00% of their portfolio | 200 $0 | Unchanged |
| NewEdge Advisors, LLC 0.00% of their portfolio | 50 $111 | Unchanged |
| MORGAN STANLEY 0.00% of their portfolio | 21 $46 | Unchanged |
| FMR LLC 0.00% of their portfolio | 18 $40 | Unchanged |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 1 $2 | Reduced -2 |