XOOMAR
Get a free API key

Fuel Tech (FTEK)

Fuel Tech on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq.

Download CSV

85K

Short interest

settlement 2026-10-15

1.0

Days to cover

-0.4 days vs prior

17.4%

Short share of volume

2026-11-03

328

Fails to deliver

settlement 2026-10-05

Tue 2 Mar

Next earnings

estimated date

$2K

Insider flow, 90 days

1 buys, 0 sells

As of 2026-11-03.

Short interest

FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSON

As of 15 October 2026, short interest in FTEK is 84,968 shares, down 277,687 shares over the last month. Over the last 48 readings it ranged from 62,287 shares (13 December 2024) to 787,732 shares (31 July 2025). The latest reading sits at the bottom of that range. At the reported average volume of 198K shares a day that is 1.0 days to cover.

Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/ftek" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
PreviewDark previewAdd ?theme=dark to the src for a dark chart.
SettlementShares shortChangeAvg daily volumeDays to cover
2026-10-1584,968-59.0%197,9121.00
2026-09-30207,038-42.9%150,6771.37
2026-09-15362,655+166.3%308,1871.18
2026-08-31136,160+21.9%111,2851.22
2026-08-14111,682+29.6%177,6671.00
2026-07-3186,140-21.8%90,8361.00
2026-07-15110,212-44.6%191,2411.00
2026-06-30199,073+139.9%1,230,2741.00
2026-06-1582,972+30.2%127,8161.00
2026-05-2963,708-40.5%233,1731.00
2026-05-15107,056-6.0%226,3091.00
2026-04-30113,924+5.2%288,3581.00
2026-04-15108,297+9.1%132,0201.00
2026-03-3199,227-1.2%101,2931.00
2026-03-13100,439+13.1%330,3611.00
2026-02-2788,780-3.7%143,8911.00
2026-02-1392,216-3.1%160,0271.00
2026-01-3095,170-44.1%173,1511.00
2026-01-15170,284-39.9%137,7191.24
2025-12-31283,130-20.1%214,3711.32
2025-12-15354,545-5.0%103,0183.44
2025-11-28373,038-11.4%178,0972.09
2025-11-14421,181-28.1%352,9891.19
2025-10-31586,026-9.8%183,3683.20
2025-10-15649,725-9.1%220,0252.95
2025-09-30714,693+7.9%361,5041.98
2025-09-15662,575-6.3%343,9721.93
2025-08-29707,519-8.5%254,6512.78
2025-08-15773,239-1.8%611,1811.27
2025-07-31787,732+19.8%279,5402.82
2025-07-15657,472+20.7%475,7071.38
2025-06-30544,840+658.8%636,5311.00
2025-06-1371,804-19.7%294,4051.00
2025-05-3089,415-19.4%821,5211.00
2025-05-15110,993+18.1%46,7412.37
2025-04-3093,983+6.6%15,2796.15
2025-04-1588,130+10.3%41,3132.13
2025-03-3179,913+20.3%43,0421.86
2025-03-1466,423-10.0%73,5811.00
2025-02-2873,823-11.6%205,4601.00
2025-02-1483,551-16.3%102,7811.00
2025-01-3199,848-23.5%107,5381.00
2025-01-15130,499-8.1%142,9381.00
2024-12-31142,008+128.0%147,3551.00
2024-12-1362,287-4.0%100,5581.00
2024-11-2964,855-33.5%244,6531.00
2024-11-1597,478-43.0%143,6921.00
2024-10-31170,863-11.3%40,5324.22

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 3 November 2026, the short share of FTEK volume is 17.4%, down 31.6 points over the last five sessions. Over the last 30 readings it ranged from 14.0% (23 September 2026) to 83.6% (25 September 2026). The latest reading sits at the bottom of that range. The latest reading is 23.7 points below the 30-session average of 41.1%, on 30K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-11-035K30K17.4%0
2026-11-0213K40K32.6%0
2026-10-3013K48K27.3%0
2026-10-2912K70K16.6%0
2026-10-2818K79K23.1%0
2026-10-2748K97K49.0%0
2026-10-264K16K25.6%0
2026-10-2312K61K19.9%0
2026-10-2216K57K27.1%0
2026-10-219K19K47.3%0
2026-10-2010K28K36.6%0
2026-10-1911K40K27.5%0
2026-10-169K17K54.9%2,223
2026-10-15164K485K33.8%19,990
2026-10-1497K406K23.9%100
2026-10-1335K52K66.3%0
2026-10-1210K13K78.8%1,735
2026-10-0931K43K71.6%200
2026-10-0839K62K62.6%7,400
2026-10-0732K63K50.5%0
2026-10-0637K120K30.6%0
2026-10-0515K42K36.6%0
2026-10-0227K68K40.3%0
2026-10-0132K56K57.5%0
2026-09-3018K42K43.6%0
2026-09-2922K47K47.6%0
2026-09-2819K44K42.8%0
2026-09-2534K41K83.6%0
2026-09-2466K154K42.8%0
2026-09-238K57K14.0%0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 5 October 2026, the fails-to-deliver balance in FTEK is 328 shares, up 178 shares over the last settlement date. Over the last 30 readings it ranged from 5 shares (18 February 2025) to 25,695 shares (2 July 2025). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-10-05328$1.66$544
2026-09-30150$1.64$246
2026-09-29146$1.65$241
2026-09-28143$1.72$246
2026-09-1015,629$1.72$27K
2026-09-021,156$1.36$2K
2026-08-051,377$1.53$2K
2026-06-292,065$2.15$4K
2026-06-26654$1.91$1K
2026-06-254,708$1.93$9K
2026-06-2411,540$1.99$23K
2026-02-18562$1.37$770
2025-10-144,982$2.95$15K
2025-09-24615$3.52$2K
2025-09-221,000$3.18$3K
2025-08-18117$2.86$335
2025-08-072,400$2.94$7K
2025-08-061,733$2.96$5K
2025-07-29983$2.69$3K
2025-07-281,207$2.84$3K
2025-07-0225,695$2.52$65K
2025-06-308,969$2.65$24K
2025-06-122,492$1.95$5K
2025-06-094,491$1.89$8K
2025-05-271,570$1.60$3K
2025-04-114,705$0.97$5K
2025-04-072,166$0.94$2K
2025-02-254,359$1.01$4K
2025-02-242,041$1.03$2K
2025-02-185$0.93$5

Insider trades

SEC Form 4, newest first. JSON

Insiders at FTEK reported 1 open-market buy worth $2K in the last 90 days and no open-market sells. Latest filing: Nuggihalli Ramesh (President & CEO) on 2026-09-01.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-01Nuggihalli RameshPresident & CEOBuy1K$1.36$2K1K
2026-03-06ARNONE VINCENT JPresident & CEOBuy10K$1.24$12K550K
2025-06-04Jones Sharon LDirectorSell13K$1.67$21K84K
2025-03-28ARNONE VINCENT JPresident & CEOBuy15K$1.05$16K486K
2024-11-19Jones Sharon LDirectorBuy8K$1.08$9K97K
2024-11-18Jones Sharon LDirectorBuy10K$1.05$10K89K
2024-11-15Jones Sharon LDirectorBuy4K$1.05$4K79K
2024-11-14Jones Sharon LDirectorBuy7K$1.04$7K75K
2024-11-13Jones Sharon LDirectorBuy9K$1.05$10K67K
2024-11-12Jones Sharon LDirectorBuy10K$1.02$10K58K
2024-09-12ARNONE VINCENT JPresident & CEOBuy20K$1.02$20K461K
2024-09-12Albrecht Ellen TChief Financial OfficerBuy5K$1.01$5K92K
2024-08-28Jones Sharon LDirectorBuy3K$1.01$3K49K
2024-08-12Jones Sharon LDirectorBuy447$1.01$45245K
2024-08-09ARNONE VINCENT JPresident & CEOBuy20K$1.04$21K441K
2023-08-11ARNONE VINCENT JPresident & CEOBuy15K$1.20$18K345K
2022-05-17ARNONE VINCENT JPresident & CEOBuy20K$1.20$24K330K
2020-12-31BAILEY BETTYE JTenPercentOwnerSell43K$4.01$171K4.2M
2020-12-23Albrecht Ellen TActing PFO and TreasurerSell42K$5.00$210K39K
2020-12-23ARNONE VINCENT JPresident & CEOSell75K$5.01$376K310K
2020-12-23ZEITLER DENNIS LDirectorExercise or conversion44K$0.97$43K107K
2020-12-23ZEITLER DENNIS LDirectorExercise or conversion27K$1.58$43K134K
2020-12-23ZEITLER DENNIS LDirectorSell71K$4.92$349K63K
2020-12-22Albrecht Ellen TActing PFO and TreasurerSell30K$4.26$128K81K
2020-12-22ARNONE VINCENT JPresident & CEOSell125K$4.25$531K385K
2020-12-02Markowsky James JDirectorSell30K$3.37$101K0
2020-12-02Markowsky James JDirectorSell20K$3.44$69K30K
2020-11-25BAILEY DOUGLAS GDirectorSell60K$5.38$325K1.8M
2020-11-25BAILEY BETTYE JTenPercentOwnerSell42K$4.74$199K4.3M
2020-11-24Markowsky James JDirectorSell44K$5.64$248K50K
2020-11-24Markowsky James JDirectorExercise or conversion44K$0.97$43K107K
2020-11-24Markowsky James JDirectorSell13K$6.10$77K94K
2020-11-24BAILEY DOUGLAS GDirectorSell77K$5.84$449K1.8M
2020-09-25Cummings William E JRSenior Vice President, SalesBuy5K$0.72$4K292K
2020-09-24Cummings William E JRSenior Vice President, SalesBuy34K$0.64$22K287K
2020-03-17Markowsky James JDirectorGrant5K$0.59$3K63K
2020-03-17ARNONE VINCENT JPresident & CEOBuy15K$0.43$6K524K
2020-03-16Markowsky James JDirectorGrant26K$0.48$12K58K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

No holder on file reports 5% or more of FTEK in its latest filing.

FiledFormHolderSharesOf classEvent
2026-10-0713G/Ano. 6Grace & White, Inc.investment adviser1.5M4.9%2026-03-31

13F holders

Tracked managers holding FTEK at their latest 13F. JSON

3 of the 30 tracked managers held FTEK at their latest 13F, $2.9M in total at quarter-end prices. Renaissance Technologies is the largest at $2.4M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 0 added shares and 3 cut.

FundQuarterSharesValueOf portfolioChange in shares
Renaissance Technologies2026-06-301.1M$2.4M0.00%-305K
Two Sigma Investments2026-06-30168K$372K0.00%-70K
Citadel Advisors2026-06-3019K$42K0.00%-202K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Fuel Tech in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Fuel Tech (FTEK), SEC CIK 846913, listed on Nasdaq. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest
FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-03.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-05.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-07.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Earnings dates
SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-11-03.JSON and CSV
Insider trades
SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-09-01.JSON and CSV
Company record
EDGAR filing index for CIK 846913Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
10 requests a minute without a key, 30 with a free key from a free account.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other company pages

Datasets

Frequently Asked Questions

How much of FTEK is sold short?
84,968 shares were held short at the 2026-10-15 settlement, 1.0 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is FTEK's daily short volume?
On 2026-11-03, 5,215 of the 30,015 FTEK shares reported to FINRA were sold short, 17.4% of the day's reported volume. Short volume is a flow for one day, not a position.
Does FTEK have fails to deliver?
The SEC's latest file shows 328 FTEK shares failed to deliver at settlement 2026-10-05. Fails are reported per settlement date and published twice a month with a lag.
Are FTEK insiders buying or selling?
Insiders at FTEK reported 1 open-market buy worth $2K in the last 90 days and no open-market sells. Latest filing: Nuggihalli Ramesh (President & CEO) on 2026-09-01.
Who owns 5% or more of FTEK?
No holder on file reports 5% or more of FTEK in its latest filing.
Which tracked 13F managers own FTEK?
3 of the 30 tracked 13F managers held FTEK shares at their latest filing, $2.9M in all. The largest: Renaissance Technologies (1.1M shares, $2.4M), Two Sigma Investments (168K shares, $372K), Ken Griffin's Citadel Advisors (19K shares, $42K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.