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HowShorted

TAC short interest NYSE

TransAlta Corporation. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: an SEC filer exists but no defensible share count is available yet.

Shares short
13,673,000
vs previous settlement
+2,067,820 (+17.8%)
days to cover
5.22
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for TAC shares short

Days to cover

FINRA's own figure: reported shares short divided by the security's average daily trading volume, published alongside each settlement.

Aggregate net short position time series for TAC days to cover

Fails to deliver

The SEC's fails-to-deliver figure for TAC: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
3,139
10 Sep 2026
Highest in window
209,889
3 Sep 2026
Days with a balance
94
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for TransAlta Corporation fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 210K shares.

History

Every FINRA settlement we hold for TAC, newest first. สณ marks a figure FINRA itself flagged as revised.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202613,673,000+2,067,8205.22
31 Aug 202611,605,180+2,814,8328.00
14 Aug 20268,790,348+454,6394.63
31 Jul 20268,335,709+1,768,4645.35
15 Jul 20266,567,245+870,1484.27
30 Jun 20265,697,097โˆ’25,1823.63
15 Jun 20265,722,279+411,3062.15
29 May 20265,310,973โˆ’3,9414.04
15 May 20265,314,914+789,2554.27
30 Apr 20264,525,659โˆ’669,4623.52
15 Apr 20265,195,121โˆ’156,9245.39
31 Mar 20265,352,045โˆ’2,009,2882.88
13 Mar 20267,361,333+846,3284.65
27 Feb 20266,515,005โˆ’428,3664.38
13 Feb 20266,943,371+205,0994.94
30 Jan 20266,738,272+403,0193.00
15 Jan 20266,335,253+2,987,3965.54
31 Dec 20253,347,857+365,0042.55
15 Dec 20252,982,853โˆ’15,0942.41
28 Nov 20252,997,947สณโˆ’948,1541.85
14 Nov 20253,946,101+835,2231.36
31 Oct 20253,110,878โˆ’2,010,2851.63
15 Oct 20255,121,163โˆ’1,369,7221.65
30 Sep 20256,490,885โˆ’951,5206.81
15 Sep 20257,442,405โˆ’683,9237.78
29 Aug 20258,126,328+979,2827.97
15 Aug 20257,147,046+2,005,0115.05
31 Jul 20255,142,035โˆ’3,692,7214.24
15 Jul 20258,834,756โˆ’1,641,3779.14
30 Jun 202510,476,133+3,2447.22
13 Jun 202510,472,889โˆ’1,334,2884.74
30 May 202511,807,177+835,1497.99
15 May 202510,972,028โˆ’254,1039.48
30 Apr 202511,226,131+306,35411.25
15 Apr 202510,919,777โˆ’1,034,8359.01
31 Mar 202511,954,612โˆ’841,16710.50
14 Mar 202512,795,779โˆ’2,324,6856.04
28 Feb 202515,120,464+5,081,6985.45
14 Feb 202510,038,766+1,692,9784.91
31 Jan 20258,345,788+989,6793.74
15 Jan 20257,356,109โˆ’357,7814.25
31 Dec 20247,713,890+502,0366.22
13 Dec 20247,211,854โˆ’311,6345.03
29 Nov 20247,523,488+2,139,5239.18
15 Nov 20245,383,965+1,517,2134.97
31 Oct 20243,866,752+489,9836.40
15 Oct 20243,376,769โˆ’798,9154.12
30 Sep 20244,175,684โˆ’2,148,2704.90
13 Sep 20246,323,954โˆ’2,218,19212.26
30 Aug 20248,542,146+2,629,93713.18
15 Aug 20245,912,209+137,5895.84
31 Jul 20245,774,620+222,6506.96
15 Jul 20245,551,970+223,58411.04
28 Jun 20245,328,386+1,031,1025.92
14 Jun 20244,297,284+337,9456.82
31 May 20243,959,339+42,9946.14
15 May 20243,916,345โˆ’876,8823.55
30 Apr 20244,793,227+1,260,5034.81
15 Apr 20243,532,724+366,8294.57
28 Mar 20243,165,895โˆ’427,0203.58
15 Mar 20243,592,915โˆ’28,1284.79
29 Feb 20243,621,043โˆ’265,7444.52
15 Feb 20243,886,787+235,9335.21
31 Jan 20243,650,854+428,9747.87
12 Jan 20243,221,880+13,5978.75
29 Dec 20233,208,283+242,1448.09
15 Dec 20232,966,139+12,4844.82
30 Nov 20232,953,655+273,1097.49
15 Nov 20232,680,546สณโˆ’335,2624.77
31 Oct 20233,015,808โˆ’922,4417.04
13 Oct 20233,938,249โˆ’1,257,5544.97
29 Sep 20235,195,803โˆ’349,81811.04
15 Sep 20235,545,621+1,172,25313.75
31 Aug 20234,373,368+1,069,81018.14
15 Aug 20233,303,558+613,7637.39
31 Jul 20232,689,795+986,3197.26
14 Jul 20231,703,476+844,3213.09
30 Jun 2023859,155โˆ’304,8432.17
15 Jun 20231,163,998+363,0854.11
31 May 2023800,913โˆ’121,9693.93
15 May 2023922,882โˆ’877,7202.56
28 Apr 20231,800,602โˆ’210,3017.08
14 Apr 20232,010,903โˆ’279,9306.71
31 Mar 20232,290,833+4286.94
15 Mar 20232,290,405+24,0145.93
28 Feb 20232,266,391+85,1404.48
15 Feb 20232,181,251+79,6076.88
31 Jan 20232,101,644+69,5146.87
13 Jan 20232,032,130+72,4467.23
30 Dec 20221,959,684+415,7835.69
15 Dec 20221,543,901โˆ’28,8843.98
30 Nov 20221,572,785โˆ’94,7504.91
15 Nov 20221,667,535โˆ’249,6503.40
31 Oct 20221,917,185+260,5495.37
14 Oct 20221,656,636โˆ’250,3153.86
30 Sep 20221,906,951+404,8794.04
15 Sep 20221,502,072+140,5224.50
31 Aug 20221,361,550โˆ’44,7483.23
15 Aug 20221,406,298+687,6792.59
29 Jul 2022718,619โˆ’246,9111.94
15 Jul 2022965,530+89,2044.01
30 Jun 2022876,326+247,5762.32
15 Jun 2022628,750+128,3531.79
31 May 2022500,397โˆ’260,4791.34
13 May 2022760,876โˆ’88,3392.47
29 Apr 2022849,215+251,8983.56
14 Apr 2022597,317โˆ’3,2313.03
31 Mar 2022600,548+301,8452.39
15 Mar 2022298,703+43,0751.23
28 Feb 2022255,628โˆ’108,0721.17
15 Feb 2022363,700โˆ’29,8481.85
31 Jan 2022393,548โˆ’234,1672.00
14 Jan 2022627,715+319,4941.93
31 Dec 2021308,221โˆ’112,0441.88
15 Dec 2021420,265+42,0472.70
30 Nov 2021378,218+10,4552.48
15 Nov 2021367,763+89,3032.15
29 Oct 2021278,460+46,9151.96
15 Oct 2021231,545โˆ’74,4741.38
30 Sep 2021306,019+1,5361.56
15 Sep 2021304,483โˆ’49,4751.55
31 Aug 2021353,958+18,9952.27
13 Aug 2021334,963+32,2181.18
30 Jul 2021302,745โˆ’33,8341.55
15 Jul 2021336,579+67,2912.24
30 Jun 2021269,288โˆ’45,7241.00
15 Jun 2021315,012สณโˆ’108,7021.39
28 May 2021423,714โˆ’599,8111.93
14 May 20211,023,525โˆ’191,4457.36
30 Apr 20211,214,970โˆ’176,1357.84
15 Apr 20211,391,105โˆ’35,7348.76
31 Mar 20211,426,839โˆ’278,2554.90
15 Mar 20211,705,094+257,0535.31
26 Feb 20211,448,041โˆ’40,4094.04
12 Feb 20211,488,450+409,8098.36
29 Jan 20211,078,641โˆ’95,4834.27
15 Jan 20211,174,124+382,7684.69
31 Dec 2020791,356+490,7803.09
15 Dec 2020300,576โˆ’54,4952.13
30 Nov 2020355,071โˆ’455,4602.62
13 Nov 2020810,531โˆ’132,2496.20
30 Oct 2020942,780โˆ’18,4599.00
15 Oct 2020961,239+82,4999.96
30 Sep 2020878,740โˆ’73,9208.49
15 Sep 2020952,660โˆ’126,8747.74
31 Aug 20201,079,534โˆ’20,5907.17
14 Aug 20201,100,124+569,4886.36
31 Jul 2020530,636โˆ’628,1682.76
15 Jul 20201,158,804โˆ’6,4477.26
30 Jun 20201,165,251+224,7575.00
15 Jun 2020940,494+525,3393.66
29 May 2020415,155โˆ’164,2311.82
15 May 2020579,386สณโˆ’2,314,7231.34
30 Apr 20202,894,109โˆ’1,142,5647.79
15 Apr 20204,036,673โˆ’430,8637.40
31 Mar 20204,467,536+2,487,9573.90
13 Mar 20201,979,579+1,513,6351.73
28 Feb 2020465,944โˆ’2,055,7061.00
14 Feb 20202,521,650+718,0366.19
31 Jan 20201,803,614สณ+511,2655.48
15 Jan 20201,292,349โˆ’395,75411.64
31 Dec 20191,688,103+40,6257.42
13 Dec 20191,647,478+1,529,9273.93
29 Nov 2019117,551โˆ’98,6811.13
15 Nov 2019216,232โˆ’714,3711.03
31 Oct 2019930,603โˆ’360,73410.50
15 Oct 20191,291,337+520,0329.98
30 Sep 2019771,305+172,1544.65
13 Sep 2019599,151โˆ’105,4144.47
30 Aug 2019704,565+107,5175.57
15 Aug 2019597,048โˆ’150,6984.14
31 Jul 2019747,746โˆ’123,9727.00
15 Jul 2019871,718โˆ’339,4856.12
28 Jun 20191,211,203+135,5254.37
14 Jun 20191,075,678+208,2756.06
31 May 2019867,403+141,3365.82
15 May 2019726,067+111,5805.39
30 Apr 2019614,487โˆ’233,5963.55
15 Apr 2019848,083+405,9925.89
29 Mar 2019442,091+140,9971.93
15 Mar 2019301,094+54,0171.88
28 Feb 2019247,077โˆ’94,5031.00
15 Feb 2019341,580โˆ’63,1363.77
31 Jan 2019404,716+148,1085.18
15 Jan 2019256,608โˆ’32,5793.04
31 Dec 2018289,187+75,8243.43
14 Dec 2018213,363+21,0155.80
30 Nov 2018192,348+20,2725.32
15 Nov 2018172,076โˆ’309,2626.32
31 Oct 2018481,338โˆ’197,3619.30
15 Oct 2018678,699โˆ’106,58013.98
28 Sep 2018785,279โˆ’24,81346.91
14 Sep 2018810,092+4,11145.99
31 Aug 2018805,981+16,38243.76
15 Aug 2018789,599+10,65521.58
31 Jul 2018778,944+36,11530.16
13 Jul 2018742,829โˆ’54,45938.97
29 Jun 2018797,288โˆ’47,69630.66
15 Jun 2018844,984โˆ’56,97352.51
31 May 2018901,957โˆ’11,11457.52
15 May 2018913,071โˆ’67,41842.46
30 Apr 2018980,489+192,01553.22
13 Apr 2018788,474+541,94445.11
29 Mar 2018246,530+11,6205.79
15 Mar 2018234,910โˆ’124,0095.13
28 Feb 2018358,919โˆ’58,40314.05
15 Feb 2018417,322+177,68111.61
31 Jan 2018239,641+20,3419.93
12 Jan 2018219,300+50,9757.49
29 Dec 2017168,325โ€“5.35

Scroll inside the table for earlier settlements, back to 29 Dec 2017.

Questions

Frequently asked questions

What is TAC's short interest?
13,673,000 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 2,067,820 from the previous settlement.
Why is there no percentage for TAC?
Because no defensible share count exists to divide by: an SEC filer exists but no defensible share count is available yet. The symbol maps to an SEC filer, but its share count cannot be used yet. A newly listed company needs two cover-page counts on file before the first is trusted; a split or an unexplained jump pauses publication until a fresh SEC count corroborates it; a secondary share class publishes under the company's primary line; and a foreign filer's short count is in depositary-share units. This page upgrades to a percentage automatically once a defensible count exists.
What is TAC's days to cover?
5.22 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume, published in the same file and shown verbatim. We hold no volume data ourselves.
Is this the short float?
No. This page shows FINRA's share count only. Short float divides that count by the public float, and short interest as we publish it elsewhere divides it by shares outstanding from SEC filings. Neither denominator is available for this line, so neither ratio is shown.
How often does this update?
FINRA member firms report short positions as of the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. We ingest each file the day it appears and re-read recent settlements for revisions.

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