Ark 21Shares Bitcoin ETF (ARKB)

Ark 21Shares Bitcoin ETF on one page: short interest, daily short volume, fails to deliver and 13F holders. Listed on CBOE.

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418K

Short interest

settlement 2026-09-30

1.0

Days to cover

unchanged vs prior

22.2%

Short share of volume

2026-10-22

171,678

Fails to deliver

settlement 2026-09-25

As of 2026-10-22.

Short interest

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

As of 30 September 2026, short interest in ARKB is 417,649 shares, up 250,065 shares over the last month. Over the last 48 readings it ranged from 24,233 shares (14 March 2025) to 2,762,650 shares (15 May 2026). At the reported average volume of 1.8M shares a day that is 1.0 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	417,649	+135.4%	1,760,890	1.00
2026-09-15	177,406	+5.9%	1,933,250	1.00
2026-08-31	167,584	-68.2%	2,266,770	1.00
2026-08-14	526,723	+97.7%	1,472,847	1.00
2026-07-31	266,386	-12.2%	1,473,905	1.00
2026-07-15	303,347	-35.6%	1,841,968	1.00
2026-06-30	471,379	+33.8%	1,909,180	1.00
2026-06-15	352,412	-18.6%	2,436,829	1.00
2026-05-29	432,687	-84.3%	1,731,914	1.00
2026-05-15	2,762,650	+879.0%	1,903,057	1.45
2026-04-30	282,180	-86.7%	2,057,599	1.00
2026-04-15	2,117,633	+479.3%	3,113,781	1.00
2026-03-31	365,574	-27.1%	4,662,563	1.00
2026-03-13	501,556	+108.7%	7,734,525	1.00
2026-02-27	240,335	-68.4%	5,093,143	1.00
2026-02-13	760,000	-66.0%	10,473,699	1.00
2026-01-30	2,232,901	+632.7%	5,554,456	1.00
2026-01-15	304,731	-86.5%	4,638,366	1.00
2025-12-31	2,254,820	+144.1%	3,936,717	1.00
2025-12-15	923,720	+176.6%	4,719,354	1.00
2025-11-28	333,948	+67.3%	7,912,272	1.00
2025-11-14	199,641	-5.5%	4,935,145	1.00
2025-10-31	211,306	+21.4%	4,602,280	1.00
2025-10-15	174,068	-68.6%	3,548,572	1.00
2025-09-30	553,623	-48.3%	2,160,064	1.00
2025-09-15	1,071,122	-50.6%	2,039,665	1.00
2025-08-29	2,166,865	+18.1%	2,543,996	1.00
2025-08-15	1,835,077	-10.6%	2,386,442	1.00
2025-07-31	2,052,860	+107.5%	1,849,542	1.11
2025-07-15	989,180	+356.1%	1,944,338	1.00
2025-06-30	216,873	+603.5%	1,778,476	1.00
2025-06-13	30,827	-95.8%	910,936	1.00
2025-05-30	733,782	-40.5%	974,285	1.00
2025-05-15	1,233,730	-8.1%	726,488	1.70
2025-04-30	1,342,571	+846.8%	1,153,920	1.16
2025-04-15	141,808	+31.0%	1,317,553	1.00
2025-03-31	108,223	+346.6%	713,178	1.00
2025-03-14	24,233	-80.2%	1,250,303	1.00
2025-02-28	122,592	+139.3%	1,466,262	1.00
2025-02-14	51,241	-4.2%	882,966	1.00
2025-01-31	53,464	-49.0%	1,153,430	1.00
2025-01-15	104,795	-55.8%	1,211,069	1.00
2024-12-31	237,156	+569.6%	1,323,392	1.00
2024-12-13	35,416	-42.4%	1,622,802	1.00
2024-11-29	61,480	-44.9%	1,965,706	1.00
2024-11-15	111,498	+70.3%	2,275,267	1.00
2024-10-31	65,476	+26.1%	1,282,308	1.00
2024-10-15	51,916	+49.5%	1,384,362	1.00

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 22 October 2026, the short share of ARKB volume is 22.2%, down 35.2 points over the last five sessions. Over the last 30 readings it ranged from 17.1% (7 October 2026) to 77.1% (21 October 2026). The latest reading sits at the bottom of that range. The latest reading is 23.1 points below the 30-session average of 45.3%, on 267K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-22	59K	267K	22.2%	50
2026-10-21	275K	356K	77.1%	0
2026-10-20	39K	110K	35.7%	0
2026-10-19	62K	153K	40.4%	74
2026-10-16	165K	293K	56.3%	366
2026-10-15	151K	262K	57.4%	751
2026-10-14	65K	128K	51.0%	100
2026-10-13	46K	88K	52.5%	0
2026-10-12	16K	45K	35.3%	300
2026-10-09	131K	195K	67.1%	1
2026-10-08	252K	1.1M	22.9%	2,616
2026-10-07	165K	966K	17.1%	230
2026-10-06	53K	150K	35.6%	157
2026-10-05	68K	149K	45.6%	0
2026-10-02	117K	281K	41.5%	0
2026-10-01	89K	188K	47.4%	0
2026-09-30	102K	193K	52.9%	796
2026-09-29	142K	204K	69.6%	0
2026-09-28	120K	339K	35.5%	990
2026-09-25	96K	212K	45.3%	67
2026-09-24	112K	346K	32.3%	648
2026-09-23	332K	506K	65.5%	0
2026-09-22	113K	201K	55.9%	400
2026-09-21	285K	520K	54.8%	117
2026-09-18	205K	346K	59.1%	0
2026-09-17	198K	303K	65.4%	0
2026-09-16	374K	2.0M	18.5%	0
2026-09-15	388K	1.4M	27.9%	400
2026-09-14	770K	1.9M	41.1%	1,000
2026-09-11	111K	366K	30.3%	0

Fails to deliver

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

As of 25 September 2026, the fails-to-deliver balance in ARKB is 171,678 shares, up 162,967 shares over the last settlement date. Over the last 30 readings it ranged from 16 shares (10 September 2026) to 359,030 shares (24 August 2026).

Settlement	Shares failed	Price	Value
2026-09-25	171,678	$27.99	$4.8M
2026-09-21	8,711	$26.93	$235K
2026-09-17	227,186	$25.16	$5.7M
2026-09-11	17	$25.58	$435
2026-09-10	16	$25.94	$415
2026-09-09	7,788	$26.01	$203K
2026-09-08	9,926	$26.47	$263K
2026-09-04	15,197	$27.12	$412K
2026-09-03	2,138	$25.63	$55K
2026-08-24	359,030	$25.55	$9.2M
2026-08-07	29	$21.35	$619
2026-08-06	1,715	$21.50	$37K
2026-08-04	202	$21.17	$4K
2026-07-20	53,991	$21.28	$1.1M
2026-07-14	2,810	$20.63	$58K
2026-06-15	4,627	$21.08	$98K
2026-06-12	10,738	$21.08	$226K
2026-06-08	21	$20.00	$420
2026-05-28	1,712	$24.84	$43K
2026-05-08	4,120	$26.58	$110K
2026-04-23	29	$26.17	$759
2026-04-15	260,630	$24.66	$6.4M
2026-04-14	118,860	$24.35	$2.9M
2026-04-02	2,276	$22.62	$51K
2026-03-24	459	$23.45	$11K
2026-03-17	25	$24.55	$614
2026-03-12	49,325	$23.46	$1.2M
2026-03-06	423	$23.64	$10K
2026-03-04	100,984	$22.65	$2.3M
2026-02-23	2,730	$22.48	$61K

13F holders

Tracked managers holding ARKB at their latest 13F. JSON

4 of the 30 tracked managers held ARKB at their latest 13F, $149.2M in total at quarter-end prices. ARK Investment Management is the largest at $125.6M (0.8% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 2 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
ARK Investment Management	2026-06-30	6.5M	$125.6M	0.82%	-244K
Millennium Management	2026-06-30	1.1M	$20.6M	0.01%	-635K
Citadel Advisors	2026-06-30	106K	$2.1M	0.00%	new
Renaissance Technologies	2026-06-30	48K	$935K	0.00%	new

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

Ark 21Shares Bitcoin ETF 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 Ark 21Shares Bitcoin ETF (ARKB), SEC CIK 1869699, listed on CBOE. 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 2026-09-30.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-22.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-25.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
Company record: EDGAR filing index for CIK 1869699Ticker, 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.

Datasets

Frequently Asked Questions

How much of ARKB is sold short?

417,649 shares were held short at the 2026-09-30 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 ARKB's daily short volume?

On 2026-10-22, 59,167 of the 266,588 ARKB shares reported to FINRA were sold short, 22.2% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ARKB have fails to deliver?

The SEC's latest file shows 171,678 ARKB shares failed to deliver at settlement 2026-09-25. Fails are reported per settlement date and published twice a month with a lag.

Are ARKB insiders buying or selling?

No Form 4 filings for ARKB are on record.

Which tracked 13F managers own ARKB?

4 of the 30 tracked 13F managers held ARKB shares at their latest filing, $149.2M in all. The largest: Cathie Wood's ARK Investment Management (6.5M shares, $125.6M), Izzy Englander's Millennium Management (1.1M shares, $20.6M), Ken Griffin's Citadel Advisors (106K shares, $2.1M), Renaissance Technologies (48K shares, $935K).

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

Ark 21Shares Bitcoin ETF (ARKB)

Short interest

Daily short volume

Fails to deliver

13F holders

Ark 21Shares Bitcoin ETF in the regulatory record

Source and updates

How to read it

Other company pages

Datasets

Frequently Asked Questions