Short interest // FINRA, biweekly, dated

NCNA short interest

Free to use. No account, no card.

NuCana plc American Depositary

3.48% of NCNA’s shares outstanding is sold short

145,031 shares short / 4,161,971 ADS outstanding (share count as of 2025-12-31, 20-F).

NCNA is an ADR, so the denominator is the ADS count, derived from the ratio its own filing states: 20,809,854,947 ordinary ÷ 5,000 per ADS = 4,161,971 ADS. 20-F, 2026-03-19 →

“Moderate” describes how crowded the short position is, not where the stock goes next. Percent of shares outstanding, not percent of float; where filings allow it, the float version appears below as a floor.

As of the 2026-10-15 settlement, which is 26 days ago. FINRA publishes twice a month on the seventh business day after settlement, so this cycle was published around 2026-10-26 and the next is expected around 2026-11-10. No free source anywhere has anything fresher, including sites that display this number next to a live price.

Shares sold short	145,031 ⊙ EVIDENCE — filed/published fact SourceFINRA consolidated short interest FieldcurrentShortPositionQuantity As of2026-10-15 settlement HowFile shrt20261015.csv in FINRA's catalog (posted ~7 business days after settlement). Open the source document →
Prior settlement	99,936
Change	+45.1%
Days to coverShares short divided by average daily volume, both FINRA figures.	1.02 ⊙ INFERENCE — derived by arithmetic SourceFINRA consolidated short interest FieldcurrentShortPositionQuantity ÷ averageDailyVolumeQuantity As of2026-10-15 settlement HowComputed from FINRA’s two published operands. FINRA’s own daysToCoverQuantity field floors at 1.00 and is not used. Open the source document →
Average daily volume (FINRA, the days-to-cover denominator)	141,543
Exchange	Nasdaq (SmallCap)
Reg SHO threshold listPersistent settlement failures under Reg SHO Rule 203. A delivery-failure list, not a “naked shorting” list.	Not on the list (2026-11-09)
Short interest, % of shares outstandingPercent of shares outstanding. Not percent of float, and the two are not the same number.	3.48%
ADS outstanding (derived)from filings, as of 2025-12-31 — 20,809,854,947 ordinary ÷ 5,000 per ADS, ratio from the 20-F filed 2026-03-19	4,161,971

Short interest history

77 settlements on record, oldest 2023-08-15. Biweekly points, from FINRA’s own archive.

Dashed line at the 15 September 2026 settlement: FINRA began quoting every field of its short interest file. What it did to this history, and what we did

Settlement	Shares short	Change	% of shares out	Days to cover	Close, USD	Value short, USD
2026-10-15	145,031	+45.1%	no share count within 200 days	1.02	1.02	147,932
2026-09-30	99,936	-6.7%	no share count within 200 days	0.31	1.35	134,914
2026-09-15	107,128	-32.5%	no share count within 200 days	2.62	1.30	139,266
2026-08-31	158,689	+18.1%	no share count within 200 days	1.24	1.47	233,273
2026-08-14	134,388	-8.1%	no share count within 200 days	3.00	1.59	213,677
2026-07-31	146,276	-16.3%	no share count within 200 days	5.01	1.32	193,084
2026-07-15	174,675	+50.9%	no share count within 200 days	1.93	1.35	235,811
2026-06-30	115,766	-11.4%	no share count within 200 days	2.86	1.52	175,964
2026-06-15	130,646	+2.6%	no share count within 200 days	2.52	1.92	250,840
2026-05-29	127,295	-23.8%	no share count within 200 days	3.30	2.33	296,597
2026-05-15	167,041	-1.3%	no share count within 200 days	3.51	2.18	364,149
2026-04-30	169,168	+0.0%	no share count within 200 days	7.20	2.13	360,328

Show the other 65 settlements, back to 2023-08-15

Settlement	Shares short	Change	% of shares out	Days to cover	Close, USD	Value short, USD
2026-04-15	169,130	+0.4%	no share count within 200 days	3.49	2.18	368,703
2026-03-31	168,450	+5.3%	no share count within 200 days	3.17	1.40	235,830
2026-03-13	160,023	-9.3%	no share count within 200 days	3.22	1.91	305,644
2026-02-27	176,475	-6.2%	no share count within 200 days	8.50	2.16	381,186
2026-02-13	188,048	-11.4%	no share count within 200 days	3.62	2.12	398,662
2026-01-30	212,167	+8.1%	no share count within 200 days	2.51	2.51	532,539
2026-01-15	196,325	+0.5%	no share count within 200 days	2.03	3.34	655,726
2025-12-31	195,364	-5.5%	no share count within 200 days	3.16	3.60	703,310
2025-12-15	206,809	+8.8%	no share count within 200 days	3.91	3.62	748,649
2025-11-28	190,147	-41.3%	no share count within 200 days	2.43	4.28	813,829
2025-11-14	324,056	+43.8%	no share count within 200 days	4.62	3.41	1.1M
2025-10-31	225,427	-37.6%	no share count within 200 days	0.73	4.01	903,962
2025-10-15	361,353	-17.3%	no share count within 200 days	0.55	5.36	1.9M
2025-09-30	437,063	-0.2%	no share count within 200 days	0.70	4.64	2.0M
2025-09-15	438,050	+22.3%	no share count within 200 days	0.76	4.50	2.0M
2025-08-29	358,216	-2.4%	no share count within 200 days	1.13	3.19	1.1M
2025-08-15	367,178	-97.0%	no share count within 200 days	0.48	3.73	1.4M
2025-07-31	12,204,905	-58.1%	no share count within 200 days	0.05	0.04	523,590
2025-07-15	29,121,055	+543.3%	no share count within 200 days	0.09	0.05	1.5M
2025-06-30	4,527,080	-1.7%	no share count within 200 days	0.05	0.06	259,854
2025-06-13	4,607,312	+66.5%	no share count within 200 days	0.01	0.11	529,380
2025-05-30	2,767,784	-9.2%	no share count within 200 days	0.03	0.04	97,703
2025-05-15	3,046,998	+407.5%	no share count within 200 days	0.02	0.05	162,710
2025-04-30	600,343	+5162.5%	no share count within 200 days	2.82	0.59	354,202
2025-04-15	11,408	-90.2%	no share count within 200 days	0.16	0.87	9,925
2025-03-31	115,861	+1216.9%	no share count within 200 days	0.63	0.87	101,123
2025-03-14	8,798	-49.2%	no share count within 200 days	0.29	0.76	6,691
2025-02-28	17,330	-2.1%	no share count within 200 days	0.36	0.97	16,810
2025-02-14	17,698	-66.9%	no share count within 200 days	0.35	0.91	16,105
2025-01-31	53,534	-56.0%	no share count within 200 days	0.79	1.02	54,605
2025-01-15	121,645	-15.7%	no share count within 200 days	0.90	1.08	131,389
2024-12-31	144,328	+73.9%	no share count within 200 days	0.46	1.19	171,750
2024-12-13	83,016	+36.5%	no share count within 200 days	1.05	1.27	105,430
2024-11-29	60,811	-3.6%	no share count within 200 days	0.45	1.30	79,054
2024-11-15	63,100	-0.7%	no share count within 200 days	0.45	1.49	94,019
2024-10-31	63,534	-35.3%	no share count within 200 days	0.39	1.62	102,925
2024-10-15	98,267	-62.7%	no share count within 200 days	0.45	1.88	184,742
2024-09-30	263,576	+322.1%	no share count within 200 days	0.04	2.30	606,225
2024-09-13	62,449	+0.1%	no share count within 200 days	0.48	2.54	158,620
2024-08-30	62,405	+41.5%	no share count within 200 days	0.11	3.66	228,402
2024-08-15	44,111	-7.9%	no share count within 200 days	3.56	3.29	145,125
2024-07-31	47,887	+42.5%	no share count within 200 days	0.82	3.64	174,309
2024-07-15	33,597	-2.6%	no share count within 200 days	2.91	3.10	104,151
2024-06-28	34,490	+3.0%	no share count within 200 days	2.69	before stored bars	no close to value it
2024-06-14	33,471	-10.5%	no share count within 200 days	1.96	before stored bars	no close to value it
2024-05-31	37,416	+16.3%	no share count within 200 days	2.31	before stored bars	no close to value it
2024-05-15	32,178	+41.9%	no share count within 200 days	0.68	before stored bars	no close to value it
2024-04-30	22,682	-90.2%	no share count within 200 days	0.50	before stored bars	no close to value it
2024-04-15	232,358	+40.9%	no share count within 200 days	0.62	before stored bars	no close to value it
2024-03-28	164,886	-93.4%	no share count within 200 days	0.24	before stored bars	no close to value it
2024-03-15	2,480,996	+2617.0%	no share count within 200 days	0.31	before stored bars	no close to value it
2024-02-29	91,315	+293.2%	no share count within 200 days	0.77	before stored bars	no close to value it
2024-02-15	23,224	-29.9%	no share count within 200 days	0.25	before stored bars	no close to value it
2024-01-31	33,137	-16.1%	no share count within 200 days	0.23	before stored bars	no close to value it
2024-01-12	39,482	-34.4%	no share count within 200 days	0.46	before stored bars	no close to value it
2023-12-29	60,150	-32.8%	no share count within 200 days	0.18	before stored bars	no close to value it
2023-12-15	89,510	-40.9%	no share count within 200 days	0.57	before stored bars	no close to value it
2023-11-30	151,386	-11.7%	no share count within 200 days	3.61	before stored bars	no close to value it
2023-11-15	171,380	+3.1%	no share count within 200 days	3.94	before stored bars	no close to value it
2023-10-31	166,235	+101.2%	no share count within 200 days	1.58	before stored bars	no close to value it
2023-10-13	82,614	+111.6%	no share count within 200 days	0.53	before stored bars	no close to value it
2023-09-29	39,041	-26.6%	no share count within 200 days	1.09	before stored bars	no close to value it
2023-09-15	53,192	-3.5%	no share count within 200 days	1.10	before stored bars	no close to value it
2023-08-31	55,112	-45.5%	no share count within 200 days	1.46	before stored bars	no close to value it
2023-08-15	101,130	no prior settlement	no share count within 200 days	1.38	before stored bars	no close to value it

Change is against the settlement before it, and is left out where one is missing from the archive. Percent of shares outstanding divides by the filed share count dated nearest each settlement, within 200 days, so it moves when the share count does; it is not percent of float. Close and value short (shares short times that day’s close, both as traded) come from our stored daily bars, which begin 2024-07-01; earlier settlements show none rather than a figure from another source. Nothing here is split-adjusted, so a split appears as the step it was.

Different measurement // daily, and not a position

Daily short volume

This is not the number above. Short interest is the position still held short, reported twice a month. Short volume is the share of a single day’s trading that was marked as a sell-short order, published daily. Most of it is market makers hedging and closing within the same session, so a stock printing a high figure here is not that percentage sold short.

Latest session (2026-11-09)

29.4%

Average, last 10 sessions

38.1%

2026-11-0929.4%

2026-11-0671.3%

2026-11-0531.2%

2026-11-0449.6%

2026-11-0315.8%

2026-11-0257.1%

2026-10-3028.2%

2026-10-2928.5%

2026-10-2839.5%

2026-10-2730.6%

FINRA Reg SHO consolidated daily file. Sessions with no row for NCNA are omitted rather than shown as zero.

Price context // daily bars, not short data

Where the price sits

Session of 2026-11-09, from 276 sessions of daily bars. These are price figures, not short figures, and they update daily rather than twice a month.

Close	$0.96
Volume, latest session	14,334
Volume vs averageAgainst its own 50-session average of 143,785, same series on both sides	0.10x
% from 52-week high ($4.55)	-78.9%
% from 52-week low ($0.90)	+6.7%
52-week performance	-73.8%
% from 50-day average ($1.17)	-17.8%
% from 200-day average ($1.68)	-42.9%
RSI, 14-dayWilder’s construction, so it matches what charting platforms print	39.5

Why there is no “% of float” here

Percent of float is the number the paid trackers lead with, and it is the one number in this category that cannot be published honestly for free. There is no free float share count: the SEC’s XBRL concept for float does not exist, and the closest one, public float, is measured in dollars and is filed once a year with the annual report. For Apple it currently reads as of March 2025, sixteen months ago.

So a free site showing percent of float is doing one of two things: quietly substituting shares outstanding, which for a heavily insider-held small company is a wildly different number, or republishing a commercial estimate it licensed. We publish the percentage that filed data supports, label it as percent of shares outstanding, and where insider Form 4 filings allow it we publish percent of float as an explicit floor: subtracting only filed direct insider holdings from shares outstanding gives a ceiling on float, so the division gives a number the true percentage can only exceed. What we will not do is print a bare “% of float” built on someone else’s estimate. Where a figure is measured, this site says what it was measured against. Read the methodology.

What days to cover means

Open short interest divided by average daily trading volume: roughly how many full sessions of normal volume it would take for every short position to be bought back. FINRA computes it per security at each settlement and we pass their figure through. This matters more than it sounds, because sites that compute their own pick their own volume window and rarely say which, so the same stock shows materially different values depending on where you look.

High short interest and high days to cover describe fuel, not ignition. They say a crowded position exists; they say nothing about whether it unwinds, and heavily shorted stocks frequently keep falling. Educational information, not investment advice.

FINRA is the owner and source of this short interest and short sale volume data. Free on every plan; not for redistribution.

NCNA short interest FAQ

How old is this NCNA short interest figure?

It is the 2026-10-15 settlement, which is 26 days ago. FINRA collects short interest twice a month and publishes on the seventh business day after each settlement date, so this was published around 2026-10-26 and the next cycle is expected around 2026-11-10. There is no fresher short interest available anywhere for free, including from tools that display it next to a live price.

Why does this show percent of shares outstanding rather than percent of float?

Because float share counts are not published by any free source. The SEC XBRL concept for float does not exist, and the nearest one is measured in dollars and comes only from the annual report. Every free site showing a float percentage is republishing a commercial estimate. We publish the percentage we can compute from filed data and label it for what it is, rather than passing shares outstanding off as float.

Where does days to cover come from?

Shares short divided by average daily volume, using FINRA’s own two published figures. We do not use FINRA’s own days-to-cover field, because it is floored at 1.00: across the current file, 7,869 securities, over a third of the market, are published at exactly 1.00 and nearly all of them are genuinely below it. One stock with a true ratio of 0.03 is published as 1.00. Sites that instead invent their own average-volume window produce a different problem, which is why the operands here are both FINRA’s.

Is high short interest a buy signal?

No. High short interest is frequently the market pricing real problems, and many heavily shorted stocks keep falling. This page measures positioning. It makes no recommendation.

Keep going: the full NCNA workspace · short squeeze screener · NCNA dilution profile · NCNA off-exchange (ATS) volume · what short interest means · methodology