What is ATTO's short interest?

831,090 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 182,549 from the previous settlement.

Why is there no percentage for ATTO?

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 ATTO's days to cover?

4.01 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.

ATTO short interest Nasdaq Global Market

Attovia Therapeutics, Inc. Com. 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: 831,090
vs previous settlement: +182,549 (+28.1%)
days to cover: 4.01
Settlement date: 15 Sep 2026

Shares short over time

Days to cover

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

Fails to deliver

The SEC's fails-to-deliver figure for ATTO: 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: 7,118; 11 Sep 2026
Highest in window: 48,363; 14 Aug 2026
Days with a balance: 9
Window: 16 Sep 2025 to 14 Sep 2026

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 48K shares.

History

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

Full reported short interest history
Settlement date	Shares short	Change	Days to cover
15 Sep 2026	831,090	+182,549	4.01
31 Aug 2026	648,541	+136,676	3.06
14 Aug 2026	511,865	+435,853	1.00
14 Jul 2023	76,012	−34,867	1.00
30 Jun 2023	110,879	+13,735	1.12
15 Jun 2023	97,144	−50,349	1.00
31 May 2023	147,493	+145,908	1.00
15 May 2023	1,585	−2,642	1.00
28 Apr 2023	4,227	+183	1.31
14 Apr 2023	4,044	−2,131	1.01
31 Mar 2023	6,175	+694	1.00
15 Mar 2023	5,481	−13,524	1.00
28 Feb 2023	19,005	−14,384	1.01
15 Feb 2023	33,389	+28,956	1.00
31 Jan 2023	4,433	−436	1.00
13 Jan 2023	4,869	−25,307	1.00
30 Dec 2022	30,176	+19,468	1.25
15 Dec 2022	10,708	−7,791	1.00
30 Nov 2022	18,499	+12,653	1.00
15 Nov 2022	5,846	+4,439	1.00
31 Oct 2022	1,407	−5,070	1.00
14 Oct 2022	6,477	−5,160	1.66
30 Sep 2022	11,637	−444	1.00
15 Sep 2022	12,081	−1,472	1.00
31 Aug 2022	13,553	+8,872	1.00
15 Aug 2022	4,681	−14,050	1.00
29 Jul 2022	18,731	+5,469	3.53
15 Jul 2022	13,262	+1,777	1.40
30 Jun 2022	11,485	+2,320	1.00
15 Jun 2022	9,165	−3,248	1.00
31 May 2022	12,413	+279	1.00
13 May 2022	12,134	+4,908	1.00
29 Apr 2022	7,226	−3,776	1.00
14 Apr 2022	11,002	+3,866	1.00
31 Mar 2022	7,136	+537	1.00
15 Mar 2022	6,599	+5,041	1.00
28 Feb 2022	1,558	−508	1.00
15 Feb 2022	2,066	−2,417	1.00
31 Jan 2022	4,483	−8,926	1.00
14 Jan 2022	13,409	+6,569	1.00
31 Dec 2021	6,840	+335	1.00
15 Dec 2021	6,505	−294	1.00
30 Nov 2021	6,799	+609	1.00
15 Nov 2021	6,190	+3,528	1.00
29 Oct 2021	2,662	−1,716	1.00
15 Oct 2021	4,378	−3,578	1.00
30 Sep 2021	7,956	+5,146	1.00
15 Sep 2021	2,810	+1,428	1.00
31 Aug 2021	1,382	−649	1.00
13 Aug 2021	2,031	+747	1.00
30 Jul 2021	1,284	−707	1.00
15 Jul 2021	1,991	−3,163	1.00
30 Jun 2021	5,154	+4,835	1.00
15 Jun 2021	319ʳ	−4,894	1.00
28 May 2021	5,213	−4,796	1.00
14 May 2021	10,009	+128	1.00
30 Apr 2021	9,881	+5,198	1.26
15 Apr 2021	4,683	+1,538	1.00
31 Mar 2021	3,145	+527	1.00
15 Mar 2021	2,618	+117	1.00
26 Feb 2021	2,501	−4,229	1.00
12 Feb 2021	6,730	+1,305	1.00
29 Jan 2021	5,425	+2,132	1.00
15 Jan 2021	3,293	−4,989	1.00
31 Dec 2020	8,282	+457	1.00
15 Dec 2020	7,825	+5,790	1.00
30 Nov 2020	2,035	−956	1.00
13 Nov 2020	2,991	+1,377	1.00
30 Oct 2020	1,614	−254	1.00
15 Oct 2020	1,868	+389	1.00
30 Sep 2020	1,479	−5,965	1.00
15 Sep 2020	7,444	−5,665	1.00
31 Aug 2020	13,109	−653	1.00
14 Aug 2020	13,762	+8,444	1.00
31 Jul 2020	5,318	−9,344	1.00
15 Jul 2020	14,662	+7,413	1.00
30 Jun 2020	7,249	−16,395	1.00
15 Jun 2020	23,644	−15,787	1.00
29 May 2020	39,431	−15,051	1.00
15 May 2020	54,482	+22,479	1.00
30 Apr 2020	32,003	+11,129	1.00
15 Apr 2020	20,874	−2,750	1.00
31 Mar 2020	23,624	−11,447	1.00
13 Mar 2020	35,071	+4,537	1.00
28 Feb 2020	30,534	−19,051	1.00
14 Feb 2020	49,585	−16,552	1.00
31 Jan 2020	66,137	+30,543	1.10
15 Jan 2020	35,594	+17,122	1.00
31 Dec 2019	18,472	−25,200	1.00
13 Dec 2019	43,672	−37,651	1.00
29 Nov 2019	81,323	+32,644	1.35
15 Nov 2019	48,679	+2,900	1.00
31 Oct 2019	45,779	−21,551	1.00
15 Oct 2019	67,330	−2,437	1.00
30 Sep 2019	69,767	−21,268	1.00
13 Sep 2019	91,035	+8,246	1.06
30 Aug 2019	82,789	−5,401	1.36
15 Aug 2019	88,190	+48,619	1.00
31 Jul 2019	39,571	−18,826	1.00
15 Jul 2019	58,397	−32,963	1.00
28 Jun 2019	91,360	+2,568	1.00
14 Jun 2019	88,792	+27,948	1.00
31 May 2019	60,844	−11,367	1.00
15 May 2019	72,211	+32,846	1.00
30 Apr 2019	39,365	−11,456	1.00
15 Apr 2019	50,821	−5,633	1.00
29 Mar 2019	56,454	+37,172	1.00
15 Mar 2019	19,282	−938	1.00
28 Feb 2019	20,220	−81,273	1.00
15 Feb 2019	101,493	+67,631	1.00
31 Jan 2019	33,862	−46,528	1.00
15 Jan 2019	80,390	−24,362	1.00
31 Dec 2018	104,752	−28,636	1.00
14 Dec 2018	133,388	−33,055	1.00
30 Nov 2018	166,443	−181,797	1.43
15 Nov 2018	348,240	−354,460	2.57
31 Oct 2018	702,700	+35,791	9.99
15 Oct 2018	666,909	+484,510	5.01
28 Sep 2018	182,399	−84,080	1.00
14 Sep 2018	266,479	+117,331	1.98
31 Aug 2018	149,148	−14,561	1.76
15 Aug 2018	163,709	+120,738	1.54
31 Jul 2018	42,971	−13,384	1.00
13 Jul 2018	56,355	−21,902	1.00
29 Jun 2018	78,257	−30,020	1.00
15 Jun 2018	108,277	−37,478	1.03
31 May 2018	145,755	+60,190	1.05
15 May 2018	85,565	−16,477	1.00
30 Apr 2018	102,042	+10,191	1.39
13 Apr 2018	91,851	−18,216	1.12
29 Mar 2018	110,067	+82,355	1.00
15 Mar 2018	27,712	−37,070	1.00
28 Feb 2018	64,782	−30,524	1.00
15 Feb 2018	95,306	+19,555	1.00
31 Jan 2018	75,751	−10,156	1.00
12 Jan 2018	85,907	+49,982	1.00
29 Dec 2017	35,925	–	1.00

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

Questions

Frequently asked questions

What is ATTO's short interest?: 831,090 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 182,549 from the previous settlement.
Why is there no percentage for ATTO?: 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 ATTO's days to cover?: 4.01 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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