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HowShorted

NCNA short interest Nasdaq Capital Market

NuCana plc American Depositary. 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
107,128
vs previous settlement
โˆ’51,561 (-32.5%)
days to cover
2.62
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for NCNA 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 NCNA days to cover

Fails to deliver

The SEC's fails-to-deliver figure for NCNA: 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
64,345
31 Aug 2026
Highest in window
64,345
31 Aug 2026
Days with a balance
89
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for NuCana plc American Depositary 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 64K shares.

History

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

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 2026107,128โˆ’51,5612.62
31 Aug 2026158,689+24,3011.24
14 Aug 2026134,388โˆ’11,8883.00
31 Jul 2026146,276โˆ’28,3995.01
15 Jul 2026174,675+58,9091.93
30 Jun 2026115,766โˆ’14,8802.86
15 Jun 2026130,646+3,3512.52
29 May 2026127,295โˆ’39,7463.30
15 May 2026167,041โˆ’2,1273.51
30 Apr 2026169,168+387.20
15 Apr 2026169,130+6803.49
31 Mar 2026168,450+8,4273.17
13 Mar 2026160,023โˆ’16,4523.22
27 Feb 2026176,475โˆ’11,5738.50
13 Feb 2026188,048โˆ’24,1193.62
30 Jan 2026212,167+15,8422.51
15 Jan 2026196,325+9612.03
31 Dec 2025195,364โˆ’11,4453.16
15 Dec 2025206,809+16,6623.91
28 Nov 2025190,147โˆ’133,9092.43
14 Nov 2025324,056+98,6294.62
31 Oct 2025225,427โˆ’135,9261.00
15 Oct 2025361,353โˆ’75,7101.00
30 Sep 2025437,063โˆ’9871.00
15 Sep 2025438,050+79,8341.00
29 Aug 2025358,216โˆ’8,9621.13
15 Aug 2025367,178โˆ’11,837,7271.00
31 Jul 202512,204,905โˆ’16,916,1501.00
15 Jul 202529,121,055+24,593,9751.00
30 Jun 20254,527,080โˆ’80,2321.00
13 Jun 20254,607,312+1,839,5281.00
30 May 20252,767,784โˆ’279,2141.00
15 May 20253,046,998+2,446,6551.00
30 Apr 2025600,343+588,9352.82
15 Apr 202511,408โˆ’104,4531.00
31 Mar 2025115,861+107,0631.00
14 Mar 20258,798โˆ’8,5321.00
28 Feb 202517,330โˆ’3681.00
14 Feb 202517,698โˆ’35,8361.00
31 Jan 202553,534โˆ’68,1111.00
15 Jan 2025121,645โˆ’22,6831.00
31 Dec 2024144,328+61,3121.00
13 Dec 202483,016+22,2051.05
29 Nov 202460,811โˆ’2,2891.00
15 Nov 202463,100โˆ’4341.00
31 Oct 202463,534โˆ’34,7331.00
15 Oct 202498,267โˆ’165,3091.00
30 Sep 2024263,576+201,1271.00
13 Sep 202462,449+441.00
30 Aug 202462,405+18,2941.00
15 Aug 202444,111โˆ’3,7763.56
31 Jul 202447,887+14,2901.00
15 Jul 202433,597โˆ’8932.91
28 Jun 202434,490+1,0192.69
14 Jun 202433,471โˆ’3,9451.96
31 May 202437,416+5,2382.31
15 May 202432,178+9,4961.00
30 Apr 202422,682โˆ’209,6761.00
15 Apr 2024232,358+67,4721.00
28 Mar 2024164,886โˆ’2,316,1101.00
15 Mar 20242,480,996+2,389,6811.00
29 Feb 202491,315+68,0911.00
15 Feb 202423,224โˆ’9,9131.00
31 Jan 202433,137โˆ’6,3451.00
12 Jan 202439,482โˆ’20,6681.00
29 Dec 202360,150โˆ’29,3601.00
15 Dec 202389,510โˆ’61,8761.00
30 Nov 2023151,386โˆ’19,9943.61
15 Nov 2023171,380+5,1453.94
31 Oct 2023166,235+83,6211.58
13 Oct 202382,614+43,5731.00
29 Sep 202339,041โˆ’14,1511.09
15 Sep 202353,192โˆ’1,9201.10
31 Aug 202355,112โˆ’46,0181.46
15 Aug 2023101,130+11,7531.38
31 Jul 202389,377โˆ’6292.52
14 Jul 202390,006+16,8161.81
30 Jun 202373,190โˆ’3,3411.65
15 Jun 202376,531โˆ’19,5591.90
31 May 202396,090+18,0952.50
15 May 202377,995+31,5241.78
28 Apr 202346,471โˆ’38,1011.25
14 Apr 202384,572โˆ’1,1621.35
31 Mar 202385,734โˆ’32,2561.00
15 Mar 2023117,990+42,0621.71
28 Feb 202375,928โˆ’1,3341.00
15 Feb 202377,262+4,3681.00
31 Jan 202372,894โˆ’125,3001.00
13 Jan 2023198,194+134,9891.00
30 Dec 202263,205+11,1591.00
15 Dec 202252,046โˆ’14,4391.00
30 Nov 202266,485โˆ’33,9381.00
15 Nov 2022100,423โˆ’46,2362.35
31 Oct 2022146,659โˆ’28,3222.20
14 Oct 2022174,981โˆ’17,6621.43
30 Sep 2022192,643โˆ’60,6901.48
15 Sep 2022253,333+33,8082.72
31 Aug 2022219,525+28,7593.10
15 Aug 2022190,766โˆ’99,4821.15
29 Jul 2022290,248โˆ’186,8081.00
15 Jul 2022477,056+306,5311.00
30 Jun 2022170,525โˆ’93,8702.18
15 Jun 2022264,395โˆ’52,2482.54
31 May 2022316,643โˆ’106,8262.93
13 May 2022423,469+11,9112.07
29 Apr 2022411,558โˆ’125,2811.74
14 Apr 2022536,839โˆ’153,5062.77
31 Mar 2022690,345โˆ’125,7681.50
15 Mar 2022816,113โˆ’8,2291.00
28 Feb 2022824,342โˆ’92,7585.10
15 Feb 2022917,100โˆ’103,2133.61
31 Jan 20221,020,313+45,4034.08
14 Jan 2022974,910+132,1003.79
31 Dec 2021842,810โˆ’153,4643.30
15 Dec 2021996,274โˆ’64,2643.29
30 Nov 20211,060,538โˆ’74,3962.96
15 Nov 20211,134,934โˆ’77,9012.55
29 Oct 20211,212,835โˆ’299,1152.39
15 Oct 20211,511,950+788,9971.25
30 Sep 2021722,953โˆ’169,1641.00
15 Sep 2021892,117โˆ’130,6403.61
31 Aug 20211,022,757+184,0513.10
13 Aug 2021838,706โˆ’44,6402.37
30 Jul 2021883,346+85,0331.99
15 Jul 2021798,313+302,3711.37
30 Jun 2021495,942+124,2251.10
15 Jun 2021371,717สณ+4,4751.00
28 May 2021367,242+38,0491.32
14 May 2021329,193+92,8591.16
30 Apr 2021236,334+76,2722.21
15 Apr 2021160,062+10,7911.00
31 Mar 2021149,271+29,7051.10
15 Mar 2021119,566+42,8041.00
26 Feb 202176,762+33,7881.00
12 Feb 202142,974โˆ’58,6041.00
29 Jan 2021101,578โˆ’23,3441.00
15 Jan 2021124,922+76,4621.00
31 Dec 202048,460โˆ’11,4091.00
15 Dec 202059,869โˆ’13,8851.00
30 Nov 202073,754โˆ’51,0571.00
13 Nov 2020124,811โˆ’24,1371.00
30 Oct 2020148,948โˆ’404,7381.14
15 Oct 2020553,686โˆ’687,5733.64
30 Sep 20201,241,259โˆ’1,645,7722.02
15 Sep 20202,887,031+27,87723.66
31 Aug 20202,859,154+263,77121.42
14 Aug 20202,595,383+42,74112.12
31 Jul 20202,552,642+63,51123.57
15 Jul 20202,489,131+6,42489.58
30 Jun 20202,482,707โˆ’9,01156.42
15 Jun 20202,491,718+21,98634.46
29 May 20202,469,732โˆ’138,46418.08
15 May 20202,608,196โˆ’11,48056.09
30 Apr 20202,619,676+10,74568.35
15 Apr 20202,608,931โˆ’45,19341.28
31 Mar 20202,654,124โˆ’297,30421.46
13 Mar 20202,951,428+647,4634.74
28 Feb 20202,303,965+7,33035.47
14 Feb 20202,296,635โˆ’12,597108.66
31 Jan 20202,309,232+41,62529.99
15 Jan 20202,267,607+18,98877.53
31 Dec 20192,248,619+35,12474.90
13 Dec 20192,213,495+4,57929.97
29 Nov 20192,208,916โˆ’24,80957.20
15 Nov 20192,233,725โˆ’109,03949.12
31 Oct 20192,342,764+94,02727.28
15 Oct 20192,248,737โˆ’9,07535.50
30 Sep 20192,257,812+95,04064.14
13 Sep 20192,162,772+31,6139.22
30 Aug 20192,131,159โˆ’188,59211.94
15 Aug 20192,319,751+6,907181.53
31 Jul 20192,312,844+9,248194.08
15 Jul 20192,303,596โˆ’5,213125.66
28 Jun 20192,308,809+26,19179.30
14 Jun 20192,282,618โˆ’103,34631.68
31 May 20192,385,964โˆ’15,560433.26
15 May 20192,401,524โˆ’278,405114.29
30 Apr 20192,679,929โˆ’201,22955.35
15 Apr 20192,881,158+12,53242.30
29 Mar 20192,868,626+239,97856.63
15 Mar 20192,628,648+305,87720.29
28 Feb 20192,322,771+66,01155.35
15 Feb 20192,256,760+200,96025.80
31 Jan 20192,055,800+405,31814.93
15 Jan 20191,650,482+53,06543.40
31 Dec 20181,597,417โˆ’137,79625.42
14 Dec 20181,735,213+34,27867.91
30 Nov 20181,700,935+38,19832.46
15 Nov 20181,662,737โˆ’110,64116.13
31 Oct 20181,773,378+15,01730.78
15 Oct 20181,758,361+131,79437.09
28 Sep 20181,626,567+6,16563.38
14 Sep 20181,620,402+13,90188.93
31 Aug 20181,606,501โˆ’257,15966.86
15 Aug 20181,863,660+104,34459.24
31 Jul 20181,759,316+103,51534.03
13 Jul 20181,655,801+5,92674.49
29 Jun 20181,649,875+25,78047.35
15 Jun 20181,624,095+3,15356.56
31 May 20181,620,942โˆ’18,74545.64
15 May 20181,639,687โˆ’144,98330.45
30 Apr 20181,784,670+105,08031.46
13 Apr 20181,679,590+91,9707.68
29 Mar 20181,587,620+81,04517.30
15 Mar 20181,506,575+206,8849.56
28 Feb 20181,299,691+96,39318.85
15 Feb 20181,203,298+175,53310.44
31 Jan 20181,027,765+597,4053.28
12 Jan 2018430,360+40,5195.26
29 Dec 2017389,841โ€“8.81

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

Questions

Frequently asked questions

What is NCNA's short interest?
107,128 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 51,561 from the previous settlement.
Why is there no percentage for NCNA?
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 NCNA's days to cover?
2.62 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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