Vault-13

FUEL TECH INC FTEK

COM · Common Stock · CUSIP 359523107

43 institutional holders -3 vs Q1 2026
7,357,3717.4m shares reported held*
23.6% of all shares outstanding*
$16.3mreported value*
6 new 10 added 9 reduced 8 sold out net sold ≈ $193.0k (-87.3k shares)

* 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

0204060Q3 22: 37Q4 22: 42Q1 23: 38Q2 23: 41Q3 23: 39Q4 23: 37Q1 24: 34Q2 24: 35Q3 24: 37Q4 24: 40Q1 25: 36Q2 25: 37Q3 25: 48Q4 25: 45Q1 26: 46Q2 26: 4343Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202237
Q4 202242
Q1 202338
Q2 202341
Q3 202339
Q4 202337
Q1 202434
Q2 202435
Q3 202437
Q4 202440
Q1 202536
Q2 202537
Q3 202548
Q4 202545
Q1 202646
Q2 202643

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q3 24: 16 bought or addedQ3 24: 7 cut or sold outQ4 24: 16 bought or addedQ4 24: 9 cut or sold outQ4 24Q1 25: 15 bought or addedQ1 25: 16 cut or sold outQ2 25: 15 bought or addedQ2 25: 16 cut or sold outQ2 25Q3 25: 27 bought or addedQ3 25: 13 cut or sold outQ4 25: 22 bought or addedQ4 25: 20 cut or sold outQ4 25Q1 26: 14 bought or addedQ1 26: 20 cut or sold outQ2 26: 16 bought or addedQ2 26: 17 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 2024167
Q4 2024169
Q1 20251516
Q2 20251516
Q3 20252713
Q4 20252220
Q1 20261420
Q2 20261617

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$250k$500k$750k$1mQ3 25 calls: $930.2kQ3 25 puts: $59.0kQ3 25P/C 0.06Q4 25 calls: $141.3kQ4 25 puts: $37.1kQ4 25P/C 0.26Q1 26 calls: $0Q1 26 puts: $36.2kQ1 26P/C —Q2 26 calls: $0Q2 26 puts: $221Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$930.2k$59.0k0.06
Q4 2025$141.3k$37.1k0.26
Q1 2026$0$36.2k—
Q2 2026$0$221—

Biggest buyers

Peapod Lane Capital LLC Added +341,750+341.8k
Marquette Asset Management, LLC New +110,509+110.5k
BlackRock, Inc. Added +86,129+86.1k
THOMPSON DAVIS & CO., INC. New +85,800+85.8k
GSA CAPITAL PARTNERS LLP Added +48,889+48.9k
Rothschild Wealth LLC New +40,000+40.0k
JANE STREET GROUP, LLC Added +38,686+38.7k
NORTHERN TRUST CORP Added +28,898+28.9k
UBS Group AG Added +18,014+18.0k
VANGUARD CAPITAL MANAGEMENT LLC Added +17,703+17.7k

Biggest sellers

RENAISSANCE TECHNOLOGIES LLC Reduced -305,400-305.4k
CITADEL ADVISORS LLC Reduced -202,329-202.3k
XTX Topco Ltd Sold out -118,247-118.2k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -104,196-104.2k
TWO SIGMA INVESTMENTS, LP Reduced -69,622-69.6k
Integrated Wealth Concepts LLC Sold out -35,000-35.0k
GROUP ONE TRADING LLC Reduced -26,312-26.3k
Cresset Asset Management, LLC Sold out -25,500-25.5k
MARSHALL WACE, LLP Sold out -21,770-21.8k
Chicago Partners Investment Group LLC Sold out -17,088-17.1k

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)

BuyingSelling
101Q4 24: 1 buyingQ4 24: 0 sellingQ1 25: 1 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 1 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 1 buyingQ1 26: 0 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 1 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20241$50.1k0——
Q1 20251$15.8k0——
Q2 20250—1$21.1k—
Q3 20250—0——
Q4 20250—0——
Q1 20261$12.4k0——
Q2 20260—0——
Q3 20261$2.0k0——
DateInsiderTradeSharesPrice ValueTheir holding
2026-09-01 Nuggihalli Ramesh President & CEO Bought 1,471 $1.36 $2.0k1.5k shares new

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

#ManagerLocationShares Value% of their portfolioChangeShares change
1 GRACE & WHITE INC /NY 0.54% of their portfolio NY, NY 1,541,3071.5m $3.4m $3.4m 0.54% Unchanged
2 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 1,102,4061.1m $2.4m $2.4m 0.00% Reduced -305.4k -305,400
3 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 1,005,7011.0m $2.2m $2.2m 0.00% Added +17.7k +17,703
4 Peapod Lane Capital LLC 1.22% of their portfolio Bedford Hills, NY 820,592820.6k $1.8m $1.8m 1.22% Added +341.8k +341,750
5 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 522,983523.0k $1.2m $1.2m 0.00% Reduced -9.8k -9,825
6 BlackRock, Inc. 0.00% of their portfolio New York, NY 496,493496.5k $1.1m $1.1m 0.00% Added +86.1k +86,129
7 US BANCORP \DE\ 0.00% of their portfolio MINNEAPOLIS, MN 304,776304.8k $673.6k $673.6k 0.00% Unchanged
8 GSA CAPITAL PARTNERS LLP 0.04% of their portfolio LONDON, X0 295,141295.1k $652.0k $652.0k 0.04% Added +48.9k +48,889
9 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 168,457168.5k $372.3k $372.3k 0.00% Reduced -69.6k -69,622
10 Beartown Capital Management, LLC 0.14% of their portfolio HUNTINGTON WOODS, MI 146,689146.7k $324.2k $324.2k 0.14% Unchanged
11 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 133,459133.5k $294.9k $294.9k 0.00% Added +954 +954
12 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 121,846121.8k $269.3k $269.3k 0.00% Unchanged
13 Marquette Asset Management, LLC 0.03% of their portfolio MINNEAPOLIS, MN 110,509110.5k $244.2k $244.2k 0.03% New
14 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 109,483109.5k $242.0k $242.0k 0.00% Added +38.7k +38,686
15 THOMPSON DAVIS & CO., INC. 0.11% of their portfolio RICHMOND, VA 85,80085.8k $189.6k $189.6k 0.11% New
16 ESSEX INVESTMENT MANAGEMENT CO LLC 0.02% of their portfolio BOSTON, MA 77,15977.2k $170.5k $170.5k 0.02% Reduced -91 -91
17 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 60,33360.3k $133.3k $133.3k 0.00% Added +28.9k +28,898
18 Rothschild Wealth LLC 0.01% of their portfolio OAK BROOK, IL 40,00040.0k $88.4k $88.4k 0.01% New
19 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 35,89635.9k $79.3k $79.3k 0.00% Reduced -104.2k -104,196
20 LexAurum Advisors, LLC 0.01% of their portfolio OVERLAND PARK, KS 20,16020.2k $44.6k $44.6k 0.01% Added +6.0k +6,000
21 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 19,07019.1k $42.1k $42.1k 0.00% Reduced -202.3k -202,329
22 Legato Capital Management LLC 0.00% of their portfolio San Francisco, CA 18,16518.2k $40.1k $40.1k 0.00% Unchanged
23 UBS Group AG 0.00% of their portfolio ZURICH, V8 18,01518.0k $39.8k $39.8k 0.00% Added +18.0k +18,014
24 GROUP ONE TRADING LLC 0.00% of their portfolio CHICAGO, IL 13,90313.9k $30.7k $30.7k 0.00% Reduced -26.3k -26,312
25 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 13,42813.4k $29.1k $29.1k 0.00% Reduced -6.0k -6,000
26 Covestor Ltd 0.02% of their portfolio LONDON, X0 12,42612.4k $27.0k $27.0k 0.02% Unchanged
27 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 11,98312.0k $26.0k $26.0k 0.00% New
28 Scientech Research LLC 0.02% of their portfolio JERSEY CITY, NJ 11,44111.4k $25.3k $25.3k 0.02% New
29 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 10,49110.5k $23.2k $23.2k 0.00% Added +9.5k +9,487
30 HighTower Advisors, LLC 0.00% of their portfolio CHICAGO, IL 10,44010.4k $23.1k $23.1k 0.00% Unchanged
31 Founders Capital Management 0.01% of their portfolio HOUSTON, TX 6,0006.0k $13.3k $13.3k 0.01% Unchanged
32 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 5,5005.5k $12.2k $12.2k 0.00% Unchanged
33 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 2,0192.0k $4.5k $4.5k 0.00% New
34 New England Capital Financial Advisors LLC 0.00% of their portfolio MERIDEN, CT 2,0002.0k $4.4k $4.4k 0.00% Unchanged
35 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 1,2001.2k $2.7k $2.7k 0.00% Unchanged
36 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 710710 $1.6k $1.6k 0.00% Unchanged
37 Steward Partners Investment Advisory, LLC 0.00% of their portfolio STAMFORD, CT 600600 $1.3k $1.3k 0.00% Unchanged
38 Wilmington Savings Fund Society, FSB 0.00% of their portfolio WILMINGTON, DE 500500 $1.1k $1.1k 0.00% Unchanged
39 CKW FINANCIAL GROUP 0.00% of their portfolio HONOLULU, HI 200200 $0 $0 0.00% Unchanged
40 NewEdge Advisors, LLC 0.00% of their portfolio NEW ORLEANS, LA 5050 $111 $111 0.00% Unchanged
41 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 2121 $46 $46 0.00% Unchanged
42 FMR LLC 0.00% of their portfolio BOSTON, MA 1818 $40 $40 0.00% Unchanged
43 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 11 $2 $2 0.00% Reduced -2 -2