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HowShorted

AMRN short interest Nasdaq Capital Market

Amarin Corporation plc. 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
525,845
vs previous settlement
+14,843 (+2.9%)
days to cover
10.10
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for AMRN: 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
34
8 Sep 2026
Highest in window
6,942
22 Oct 2025
Days with a balance
64
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Amarin Corporation plc 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 6.9K shares.

History

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

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 2026525,845+14,84310.10
31 Aug 2026511,002โˆ’14,6834.66
14 Aug 2026525,685โˆ’6,42810.80
31 Jul 2026532,113+18,9119.77
15 Jul 2026513,202โˆ’29,6596.44
30 Jun 2026542,861โˆ’70,6225.29
15 Jun 2026613,483โˆ’10,6105.79
29 May 2026624,093+3,87414.85
15 May 2026620,219โˆ’53,7488.75
30 Apr 2026673,967+247,2167.16
15 Apr 2026426,751โˆ’28,70611.69
31 Mar 2026455,457+8,50110.12
13 Mar 2026446,956+8,5644.79
27 Feb 2026438,392+28,2644.71
13 Feb 2026410,128โˆ’9,1875.87
30 Jan 2026419,315+10,0054.67
15 Jan 2026409,310โˆ’3,2184.00
31 Dec 2025412,528+5,7454.42
15 Dec 2025406,783โˆ’9,4084.39
28 Nov 2025416,191+21,5705.65
14 Nov 2025394,621+23,6383.84
31 Oct 2025370,983+29,0412.13
15 Oct 2025341,942โˆ’33,0462.78
30 Sep 2025374,988โˆ’30,7515.26
15 Sep 2025405,739โˆ’19,4738.26
29 Aug 2025425,212โˆ’1957.27
15 Aug 2025425,407โˆ’51,2406.04
31 Jul 2025476,647+62,8627.23
15 Jul 2025413,785โˆ’34,5373.60
30 Jun 2025448,322+18,2741.94
13 Jun 2025430,048โˆ’68,9863.26
30 May 2025499,034โˆ’59,3429.58
15 May 2025558,376+86,3725.67
30 Apr 2025472,004โˆ’157,4394.76
15 Apr 2025629,443โˆ’11,341,5834.82
31 Mar 202511,971,026+1,133,4229.44
14 Mar 202510,837,604โˆ’5,951,5623.62
28 Feb 202516,789,166โˆ’256,78924.20
14 Feb 202517,045,955+198,34315.68
31 Jan 202516,847,612โˆ’339,38115.31
15 Jan 202517,186,993โˆ’1,532,69113.16
31 Dec 202418,719,684+529,1448.30
13 Dec 202418,190,540+241,90011.22
29 Nov 202417,948,640+19,90511.03
15 Nov 202417,928,735โˆ’19,28315.34
31 Oct 202417,948,018โˆ’132,51017.36
15 Oct 202418,080,528+210,94023.87
30 Sep 202417,869,588โˆ’361,83126.01
13 Sep 202418,231,419+250,34727.89
30 Aug 202417,981,072โˆ’625,00621.21
15 Aug 202418,606,078+140,0228.02
31 Jul 202418,466,056โˆ’465,09814.03
15 Jul 202418,931,154โˆ’1,497,66415.44
28 Jun 202420,428,818+1,407,94916.17
14 Jun 202419,020,869+3,211,0165.72
31 May 202415,809,853โˆ’254,21718.99
15 May 202416,064,070โˆ’114,71712.89
30 Apr 202416,178,787+338,13920.20
15 Apr 202415,840,648โˆ’2,179,37810.15
28 Mar 202418,020,026โˆ’170,65519.16
15 Mar 202418,190,681+1,198,5717.94
29 Feb 202416,992,110+243,0738.13
15 Feb 202416,749,037+2,349,71514.33
31 Jan 202414,399,322+1,598,3805.63
12 Jan 202412,800,942โˆ’814,5143.12
29 Dec 202313,615,456โˆ’1,243,4894.14
15 Dec 202314,858,945+84,7336.54
30 Nov 202314,774,212โˆ’545,73416.05
15 Nov 202315,319,946โˆ’569,1539.62
31 Oct 202315,889,099โˆ’274,5839.52
13 Oct 202316,163,682+294,7239.22
29 Sep 202315,868,959โˆ’913,81810.28
15 Sep 202316,782,777+280,72510.17
31 Aug 202316,502,052โˆ’1,734,5599.24
15 Aug 202318,236,611โˆ’1,897,5646.69
31 Jul 202320,134,175โˆ’103,8263.83
14 Jul 202320,238,001โˆ’522,73714.87
30 Jun 202320,760,738+882,3449.32
15 Jun 202319,878,394โˆ’623,27312.97
31 May 202320,501,667โˆ’478,98210.94
15 May 202320,980,649โˆ’3,094,0206.29
28 Apr 202324,074,669+210,50013.99
14 Apr 202323,864,169+1,639,3968.72
31 Mar 202322,224,773+3,339,0577.82
15 Mar 202318,885,716+4,367,4623.99
28 Feb 202314,518,254+2,450,4143.08
15 Feb 202312,067,840โˆ’550,7813.13
31 Jan 202312,618,621โˆ’2,123,9531.75
13 Jan 202314,742,574+1,511,9193.09
30 Dec 202213,230,655+3,578,2353.92
15 Dec 20229,652,420โˆ’30,6911.92
30 Nov 20229,683,111+124,5295.14
15 Nov 20229,558,582โˆ’574,4173.39
31 Oct 202210,132,999+539,6033.76
14 Oct 20229,593,396+758,6844.49
30 Sep 20228,834,712โˆ’725,6212.92
15 Sep 20229,560,333โˆ’3,163,2362.20
31 Aug 202212,723,569โˆ’1,260,8003.92
15 Aug 202213,984,369โˆ’9,754,2233.32
29 Jul 202223,738,592โˆ’2,651,1499.49
15 Jul 202226,389,741+2,925,6107.42
30 Jun 202223,464,131+911,0996.78
15 Jun 202222,553,032+3,298,1483.76
31 May 202219,254,884+1,413,3747.71
13 May 202217,841,510โˆ’248,6971.55
29 Apr 202218,090,207+1,395,1887.26
14 Apr 202216,695,019+206,1407.48
31 Mar 202216,488,879โˆ’1,429,8459.53
15 Mar 202217,918,724+662,6384.98
28 Feb 202217,256,086+429,7588.19
15 Feb 202216,826,328+1,604,4745.49
31 Jan 202215,221,854+220,5881.90
14 Jan 202215,001,266+707,5635.03
31 Dec 202114,293,703โˆ’3,414,7694.66
15 Dec 202117,708,472+2,077,1424.03
30 Nov 202115,631,330โˆ’347,5683.13
15 Nov 202115,978,898โˆ’1,723,9883.66
29 Oct 202117,702,886โˆ’573,2576.07
15 Oct 202118,276,143+995,8168.97
30 Sep 202117,280,327+234,6796.78
15 Sep 202117,045,648+596,5866.35
31 Aug 202116,449,062+3,507,3354.10
13 Aug 202112,941,727โˆ’742,3812.17
30 Jul 202113,684,108โˆ’6,358,6525.12
15 Jul 202120,042,760โˆ’3,497,0705.72
30 Jun 202123,539,830โˆ’1,541,6605.64
15 Jun 202125,081,490สณ+1,192,3419.24
28 May 202123,889,149โˆ’604,36310.73
14 May 202124,493,512โˆ’1,546,4995.66
30 Apr 202126,040,011+41,9656.57
15 Apr 202125,998,046+3,710,8954.24
31 Mar 202122,287,151+304,8925.07
15 Mar 202121,982,259+2,047,8503.21
26 Feb 202119,934,409โˆ’201,3734.14
12 Feb 202120,135,782โˆ’75,8712.54
29 Jan 202120,211,653โˆ’1,775,9962.60
15 Jan 202121,987,649โˆ’69,3653.52
31 Dec 202022,057,014โˆ’2,360,9602.90
15 Dec 202024,417,974+712,4853.20
30 Nov 202023,705,489โˆ’1,605,5602.83
13 Nov 202025,311,049+1,527,5624.16
30 Oct 202023,783,487โˆ’828,2236.73
15 Oct 202024,611,710โˆ’244,0453.71
30 Sep 202024,855,755โˆ’2,349,2333.09
15 Sep 202027,204,988+794,7941.40
31 Aug 202026,410,194โˆ’1,398,2015.19
14 Aug 202027,808,395โˆ’2,640,8184.40
31 Jul 202030,449,213โˆ’223,9446.66
15 Jul 202030,673,157โˆ’1,638,7348.13
30 Jun 202032,311,891โˆ’765,9665.97
15 Jun 202033,077,857โˆ’1,037,2044.86
29 May 202034,115,061โˆ’2,069,4434.56
15 May 202036,184,504สณโˆ’1,945,2334.84
30 Apr 202038,129,737โˆ’1,307,4813.30
15 Apr 202039,437,218+4,682,5591.15
31 Mar 202034,754,659โˆ’7,621,1633.51
13 Mar 202042,375,822โˆ’1,665,4335.65
28 Feb 202044,041,255+5,856,9844.82
14 Feb 202038,184,271โˆ’3,036,4867.59
31 Jan 202041,220,757โˆ’4,813,2396.84
15 Jan 202046,033,996+1,469,5695.07
31 Dec 201944,564,427โˆ’2,853,0513.52
13 Dec 201947,417,478+1,549,4477.50
29 Nov 201945,868,031โˆ’2,518,2853.52
15 Nov 201948,386,316โˆ’7,249,7382.91
31 Oct 201955,636,054+5,196,62912.38
15 Oct 201950,439,425โˆ’1,297,1618.50
30 Sep 201951,736,586+866,76110.79
13 Sep 201950,869,825+9,052,5767.27
30 Aug 201941,817,249โˆ’5,293,3116.62
15 Aug 201947,110,560+14,769,5754.30
31 Jul 201932,340,985+365,6422.94
15 Jul 201931,975,343+6,755,2222.14
28 Jun 201925,220,121โˆ’22,3875.52
14 Jun 201925,242,508สณโˆ’1,241,2515.44
31 May 201926,483,759+906,2264.24
15 May 201925,577,533+1,844,9545.03
30 Apr 201923,732,579+1,820,6434.36
15 Apr 201921,911,936+762,8603.88
29 Mar 201921,149,076+4,289,1091.97
15 Mar 201916,859,967โˆ’654,5572.08
28 Feb 201917,514,524+2,101,5481.74
15 Feb 201915,412,976+347,3313.17
31 Jan 201915,065,645โˆ’1,908,4601.94
15 Jan 201916,974,105+3,650,3341.38
31 Dec 201813,323,771+3,380,1421.79
14 Dec 20189,943,629โˆ’6,090,6831.92
30 Nov 201816,034,312+4,679,7441.65
15 Nov 201811,354,568โˆ’6,146,0821.00
31 Oct 201817,500,650+4,448,0221.64
15 Oct 201813,052,628โˆ’3,176,7101.00
28 Sep 201816,229,338+4,084,3281.00
14 Sep 201812,145,010+1,687,2683.23
31 Aug 201810,457,742+3,258,9812.98
15 Aug 20187,198,761+946,2672.89
31 Jul 20186,252,494+479,6151.38
13 Jul 20185,772,879+306,1232.02
29 Jun 20185,466,756+1,133,1071.90
15 Jun 20184,333,649+241,0523.15
31 May 20184,092,597+240,5662.24
15 May 20183,852,031+397,5262.34
30 Apr 20183,454,505โˆ’4,111,3751.09
13 Apr 20187,565,880โˆ’67,3363.71
29 Mar 20187,633,216โˆ’112,9393.43
15 Mar 20187,746,155โˆ’84,8374.67
28 Feb 20187,830,992+1,453,4225.53
15 Feb 20186,377,570โˆ’1,217,4842.92
31 Jan 20187,595,054+186,1262.05
12 Jan 20187,408,928+419,1615.87
29 Dec 20176,989,767โ€“3.23

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

Questions

Frequently asked questions

What is AMRN's short interest?
525,845 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 14,843 from the previous settlement.
Why is there no percentage for AMRN?
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 AMRN's days to cover?
10.10 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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