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Montauk Renewables (MNTK)

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

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1.5M

Short interest

settlement 2026-10-15

1.9

Days to cover

unchanged vs prior

65.7%

Short share of volume

2026-11-02

566

Fails to deliver

settlement 2026-10-13

Wed 4 Nov

Next earnings

estimated date

$0

Insider flow, 90 days

0 buys, 0 sells

As of 2026-11-02.

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 MNTK is 1,466,550 shares, down 13,214 shares over the last month. Over the last 48 readings it ranged from 1,008,012 shares (29 August 2025) to 2,124,857 shares (31 March 2026). At the reported average volume of 768K shares a day that is 1.9 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-10-151,466,550-23.4%767,7021.91
2026-09-301,914,150+29.4%990,3581.93
2026-09-151,479,764-2.1%540,9832.74
2026-08-311,511,551+5.2%109,18813.84
2026-08-141,436,898+8.3%136,80110.50
2026-07-311,326,530+3.4%229,9965.77
2026-07-151,282,849-7.1%110,78911.58
2026-06-301,380,906+17.6%258,0855.35
2026-06-151,174,021+15.0%152,7247.69
2026-05-291,020,754+0.6%214,0024.77
2026-05-151,014,434-5.0%308,7473.29
2026-04-301,067,596-9.0%286,6713.72
2026-04-151,173,443-44.8%228,4555.14
2026-03-312,124,857+18.8%429,7704.94
2026-03-131,789,286+21.1%307,9565.81
2026-02-271,477,625-3.9%207,0227.14
2026-02-131,537,876-6.3%282,9725.43
2026-01-301,642,053+45.8%1,352,7181.21
2026-01-151,126,178+4.1%112,09110.05
2025-12-311,082,146-19.2%138,9747.79
2025-12-151,338,997+18.6%127,32310.52
2025-11-281,128,551-1.0%223,0095.06
2025-11-141,140,415-1.6%202,6795.63
2025-10-311,158,669-3.1%99,66911.63
2025-10-151,195,275-7.8%220,3775.42
2025-09-301,296,961+18.1%167,7547.73
2025-09-151,098,484+9.0%116,5889.42
2025-08-291,008,012-18.3%191,5925.26
2025-08-151,233,772-9.3%241,8945.10
2025-07-311,360,655+0.7%152,5528.92
2025-07-151,350,950-5.2%162,2638.33
2025-06-301,425,445+1.6%256,0545.57
2025-06-131,403,133-5.3%212,7306.60
2025-05-301,482,341-11.4%308,7234.80
2025-05-151,673,432+14.1%121,92113.73
2025-04-301,466,356+1.2%173,7648.44
2025-04-151,449,114+5.1%237,2506.11
2025-03-311,378,780+7.8%383,8933.59
2025-03-141,279,238-4.7%235,9135.42
2025-02-281,342,719-0.5%133,66110.05
2025-02-141,350,021-2.9%99,07413.63
2025-01-311,389,566+5.9%142,3629.76
2025-01-151,312,638-11.2%186,9447.02
2024-12-311,477,854-4.7%181,9708.12
2024-12-131,551,363-1.7%162,6179.54
2024-11-291,578,062-10.0%192,6288.19
2024-11-151,754,279-4.3%290,1546.05
2024-10-311,833,914+3.1%123,82914.81

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of MNTK volume is 65.7%, up 5.0 points over the last five sessions. Over the last 30 readings it ranged from 31.3% (12 October 2026) to 73.3% (29 October 2026). The latest reading is 13.0 points above the 30-session average of 52.7%, on 164K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-11-02108K164K65.7%0
2026-10-3092K194K47.1%14
2026-10-29185K253K73.3%0
2026-10-28107K170K62.9%0
2026-10-2764K189K34.0%32
2026-10-26116K190K60.7%0
2026-10-2353K125K42.4%0
2026-10-2257K125K45.5%0
2026-10-21129K311K41.4%100
2026-10-2077K168K46.1%500
2026-10-19118K197K60.1%655
2026-10-1689K196K45.7%300
2026-10-15115K232K49.5%0
2026-10-14124K340K36.6%36
2026-10-1383K229K36.0%10
2026-10-12103K328K31.3%1,390
2026-10-09183K326K56.0%717
2026-10-08131K247K53.1%0
2026-10-0793K194K47.9%9,802
2026-10-06277K584K47.5%1,444
2026-10-05571K1.0M56.2%21,425
2026-10-02132K222K59.3%846
2026-10-01122K218K55.8%132
2026-09-30216K362K59.7%2,221
2026-09-29241K343K70.2%1,555
2026-09-28375K630K59.5%2,022
2026-09-25736K1.0M70.9%2,400
2026-09-241.7M2.5M69.0%229,423
2026-09-23121K253K47.8%18,419
2026-09-22139K276K50.4%0

Fails to deliver

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

As of 13 October 2026, the fails-to-deliver balance in MNTK is 566 shares, up 347 shares over the last settlement date. Over the last 30 readings it ranged from 76 shares (1 October 2026) to 37,180 shares (6 October 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-10-13566$2.40$1K
2026-10-09219$2.74$600
2026-10-08500$2.66$1K
2026-10-073,168$2.66$8K
2026-10-0637,180$2.91$108K
2026-10-05306$2.87$878
2026-10-0176$2.73$207
2026-09-2523,595$2.88$68K
2026-09-241,837$2.28$4K
2026-09-2119,095$2.25$43K
2026-09-182,947$2.20$6K
2026-09-1780$2.25$180
2026-09-166,133$2.29$14K
2026-09-14568$2.64$1K
2026-09-112,335$2.55$6K
2026-09-092,189$2.50$5K
2026-09-081,697$2.23$4K
2026-09-037,500$2.13$16K
2026-09-01285$1.72$490
2026-08-313,377$1.77$6K
2026-08-267,225$1.82$13K
2026-08-215,794$1.89$11K
2026-08-133,114$1.86$6K
2026-08-119,242$1.71$16K
2026-08-072,087$1.70$4K
2026-08-0410,411$1.70$18K
2026-07-303,323$1.79$6K
2026-07-2211,007$1.68$18K
2026-07-17829$1.69$1K
2026-07-13273$1.61$440

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for MNTK in the last 90 days. The most recent filings are listed below. Latest filing: Shaw James A (Chief Operating Officer) on 2026-05-20.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-05-20Shaw James AChief Operating OfficerGrant283K$0.00$0477K
2026-05-20Van Asdalan Kevin AChief Financial OfficerGrant303K$0.00$0497K
2026-05-20McClain Sean FPresident & CEOGrant383K$0.00$01.1M
2026-05-20Ciroli JohnChief Legal OfficerGrant303K$0.00$0471K
2026-05-11Copelyn John ADirectorBuy18K$1.45$25K18K
2025-11-24Frank Sharon RVP Environ Health & SafetyTax withholding3K$1.67$5K39K
2024-11-24Frank Sharon RVP Environ Health & SafetyTax withholding3K$4.46$12K42K
2023-11-24Frank Sharon RVP Environ. Health & SafetyTax withholding3K$9.09$24K45K
2022-12-01Frank Sharon RVP Environ. Health & SafetyTax withholding3K$10.01$28K47K
2022-11-28McClain Sean FPresident and CEOSell2K$12.68$29K758K
2022-11-28McClain Sean FPresident and CEOSell58K$12.07$697K760K
2022-11-28Hill Scott EVP of Business DevelopmentSell2K$12.68$30K620K
2022-11-28Hill Scott EVP of Business DevelopmentSell102K$12.02$1.2M623K
2022-01-28Frank Sharon RVP Environ. Health & SafetyTax withholding87$10.01$87150K
2022-01-28Shaw James AVice President of OperationsTax withholding87$10.01$871195K
2022-01-28Van Asdalan Kevin ACFO and TreasurerTax withholding87$10.01$871195K
2022-01-28Hill Scott EVP of Business DevelopmentTax withholding87$10.01$871725K
2022-01-28Ciroli JohnVP, GC and SecretaryTax withholding87$10.01$871168K
2022-01-28McClain Sean FPresident and CEOTax withholding87$10.01$871818K
2021-12-01Frank Sharon RVP Environ. Health & SafetyGrant50K$0.00$050K
2021-01-28Hill Scott EVP of Business DevelopmentGrant264$0.00$0613K
2021-01-28Hill Scott EVP of Business DevelopmentGrant372K$0.00$0984K
2021-01-28Hill Scott EVP of Business DevelopmentTax withholding168K$11.38$1.9M817K
2021-01-28Shaw James AVice President of OperationsGrant264$0.00$0264
2021-01-28Shaw James AVice President of OperationsGrant354K$0.00$0354K
2021-01-28Shaw James AVice President of OperationsTax withholding160K$11.38$1.8M195K
2021-01-28Ciroli JohnVP, GC and SecretaryTax withholding150K$11.38$1.7M168K
2021-01-28Ciroli JohnVP, GC and SecretaryGrant317K$0.00$0317K
2021-01-28Ciroli JohnVP, GC and SecretaryGrant264$0.00$0264
2021-01-28McClain Sean FPresident and CEOTax withholding313K$11.38$3.6M895K
2021-01-28McClain Sean FPresident and CEOGrant264$0.00$0512K
2021-01-28McClain Sean FPresident and CEOGrant696K$0.00$01.2M
2021-01-28Van Asdalan Kevin ACFO and TreasurerGrant354K$0.00$0354K
2021-01-28Van Asdalan Kevin ACFO and TreasurerTax withholding160K$11.38$1.8M195K
2021-01-28Van Asdalan Kevin ACFO and TreasurerGrant264$0.00$0264
2021-01-21Montauk Holdings LtdTenPercentOwnerOther transaction136.0M$0.00$02.3M

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

1 holder reports 5% or more of MNTK in its latest filing, on Schedule 13D (active intent). The holder is Aktiv Investment Management (Pty) Ltd at 15.7% of the class (22,297,688 shares), filed 2025-11-10 for an event on 2025-11-03.

FiledFormHolderSharesOf classEvent
2025-11-2413G/Ano. 1Peresec Prime Brokers (Pty) Ltdother entity36Kn/a2025-11-21
2025-11-1013DAktiv Investment Management (Pty) Ltdother entity22.3M15.7%2025-11-03

13F holders

Tracked managers holding MNTK at their latest 13F. JSON

5 of the 30 tracked managers held MNTK at their latest 13F, $1.3M in total at quarter-end prices. Renaissance Technologies is the largest at $569K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 2 cut.

FundQuarterSharesValueOf portfolioChange in shares
Renaissance Technologies2026-06-30365K$569K0.00%+10K
AQR Capital Management2026-06-30238K$372K0.00%+200K
D. E. Shaw & Co.2026-06-30101K$158K0.00%-17K
Citadel Advisors2026-06-3059K$92K0.00%new
Millennium Management2026-06-3043K$68K0.00%-163K

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

Montauk Renewables 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 Montauk Renewables (MNTK), SEC CIK 1826600, 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 2026-11-02.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-13.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 2025-11-24.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 2026-08-06.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 2026-05-20.JSON and CSV
Company record
EDGAR filing index for CIK 1826600Ticker, 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 MNTK is sold short?
1,466,550 shares were held short at the 2026-10-15 settlement, 1.9 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 MNTK's daily short volume?
On 2026-11-02, 107,776 of the 164,012 MNTK shares reported to FINRA were sold short, 65.7% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MNTK have fails to deliver?
The SEC's latest file shows 566 MNTK shares failed to deliver at settlement 2026-10-13. Fails are reported per settlement date and published twice a month with a lag.
Are MNTK insiders buying or selling?
No open-market insider trades were reported for MNTK in the last 90 days. The most recent filings are listed below. Latest filing: Shaw James A (Chief Operating Officer) on 2026-05-20.
Who owns 5% or more of MNTK?
1 holder reports 5% or more of MNTK in its latest filing, on Schedule 13D (active intent). The holder is Aktiv Investment Management (Pty) Ltd at 15.7% of the class (22,297,688 shares), filed 2025-11-10 for an event on 2025-11-03.
Which tracked 13F managers own MNTK?
5 of the 30 tracked 13F managers held MNTK shares at their latest filing, $1.3M in all. The largest: Renaissance Technologies (365K shares, $569K), Cliff Asness's AQR Capital Management (238K shares, $372K), D. E. Shaw & Co. (101K shares, $158K), Ken Griffin's Citadel Advisors (59K shares, $92K), Izzy Englander's Millennium Management (43K shares, $68K).

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