Atossa Therapeutics (ATOS)

Atossa Therapeutics on one page: short interest, daily short volume, fails to deliver, 13F holders, earnings dates and insider trades. Listed on Nasdaq.

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684K

Short interest

settlement 2026-10-15

5.8

Days to cover

-5.5 days vs prior

56.0%

Short share of volume

2026-11-02

165

Fails to deliver

settlement 2026-10-14

Wed 11 Nov

Next earnings

estimated date

Insider flow, 90 days

0 buys, 0 sells

As of 2026-11-02.

Short interest

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

As of 15 October 2026, short interest in ATOS is 683,539 shares, down 78,617 shares over the last month. Over the last 48 readings it ranged from 320,202 shares (13 March 2026) to 12,767,546 shares (31 October 2024). The latest reading sits at the bottom of that range. At the reported average volume of 117K shares a day that is 5.8 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-10-15	683,539	-13.3%	116,852	5.85
2026-09-30	788,334	+3.4%	69,720	11.31
2026-09-15	762,156	+0.8%	47,073	16.19
2026-08-31	755,776	-5.0%	60,460	12.50
2026-08-14	795,457	+4.7%	55,386	14.36
2026-07-31	760,127	-2.1%	56,380	13.48
2026-07-15	776,246	+10.3%	166,441	4.66
2026-06-30	704,017	+32.0%	320,293	2.20
2026-06-15	533,343	+33.0%	262,436	2.03
2026-05-29	400,996	+17.5%	41,909	9.57
2026-05-15	341,344	+1.1%	61,047	5.59
2026-04-30	337,509	-4.1%	49,654	6.80
2026-04-15	351,934	+7.4%	62,363	5.64
2026-03-31	327,683	+2.3%	72,495	4.52
2026-03-13	320,202	-11.3%	98,614	3.25
2026-02-27	361,039	-11.7%	74,304	4.86
2026-02-13	408,724	-91.3%	311,677	1.31
2026-01-30	4,696,759	+29.7%	2,992,317	1.57
2026-01-15	3,621,023	+56.4%	1,186,997	3.05
2025-12-31	2,314,959	+1.4%	1,237,320	1.87
2025-12-15	2,284,050	+47.0%	1,461,615	1.56
2025-11-28	1,554,063	+12.7%	506,613	3.07
2025-11-14	1,379,122	+4.4%	528,597	2.61
2025-10-31	1,320,496	-3.6%	725,003	1.82
2025-10-15	1,370,402	-41.6%	2,000,579	1.00
2025-09-30	2,345,863	-16.2%	611,697	3.84
2025-09-15	2,799,971	-21.6%	516,815	5.42
2025-08-29	3,572,121	-2.4%	447,460	7.98
2025-08-15	3,659,803	-4.0%	675,333	5.42
2025-07-31	3,810,621	-6.7%	1,792,693	2.13
2025-07-15	4,085,861	-12.5%	662,820	6.16
2025-06-30	4,667,774	-37.1%	2,381,651	1.96
2025-06-13	7,415,914	-2.7%	635,992	11.66
2025-05-30	7,618,207	+6.7%	670,326	11.36
2025-05-15	7,138,285	+0.1%	794,295	8.99
2025-04-30	7,133,598	-6.5%	661,550	10.78
2025-04-15	7,627,038	-5.8%	795,656	9.59
2025-03-31	8,097,901	-5.6%	539,010	15.02
2025-03-14	8,580,955	-3.2%	519,740	16.51
2025-02-28	8,863,407	-1.4%	523,824	16.92
2025-02-14	8,989,468	-2.8%	644,058	13.96
2025-01-31	9,248,121	+5.9%	813,338	11.37
2025-01-15	8,735,726	+2.0%	811,058	10.77
2024-12-31	8,567,362	+4.5%	1,053,742	8.13
2024-12-13	8,198,158	-29.4%	912,887	8.98
2024-11-29	11,603,127	-6.8%	781,240	14.85
2024-11-15	12,454,496	-2.5%	860,945	14.47
2024-10-31	12,767,546	-2.2%	385,537	33.12

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of ATOS volume is 56.0%, up 19.3 points over the last five sessions. Over the last 30 readings it ranged from 8.7% (28 October 2026) to 85.5% (13 October 2026). The latest reading is 4.2 points above the 30-session average of 51.8%, on 19K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-11-02	11K	19K	56.0%	0
2026-10-30	4K	10K	40.5%	0
2026-10-29	18K	37K	49.2%	0
2026-10-28	2K	24K	8.7%	0
2026-10-27	7K	13K	58.0%	0
2026-10-26	5K	14K	36.6%	0
2026-10-23	14K	38K	37.9%	100
2026-10-22	9K	34K	27.5%	87
2026-10-21	39K	84K	47.2%	0
2026-10-20	5K	13K	42.4%	765
2026-10-19	21K	47K	45.0%	1,153
2026-10-16	35K	57K	61.2%	3
2026-10-15	50K	74K	67.7%	2,530
2026-10-14	90K	145K	62.3%	40
2026-10-13	36K	42K	85.5%	0
2026-10-12	40K	48K	84.5%	19,243
2026-10-09	64K	93K	68.5%	4,450
2026-10-08	10K	26K	39.7%	300
2026-10-07	6K	8K	75.1%	0
2026-10-06	16K	34K	48.4%	0
2026-10-05	12K	22K	53.3%	0
2026-10-02	15K	32K	47.5%	0
2026-10-01	36K	69K	51.4%	0
2026-09-30	21K	42K	50.3%	0
2026-09-29	14K	34K	41.2%	0
2026-09-28	28K	54K	51.3%	0
2026-09-25	15K	33K	46.3%	0
2026-09-24	10K	14K	72.0%	0
2026-09-23	4K	11K	35.9%	0
2026-09-22	48K	77K	61.8%	0

Fails to deliver

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

As of 14 October 2026, the fails-to-deliver balance in ATOS is 165 shares, up 134 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (5 October 2026) to 13,854 shares (12 August 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-10-14	165	$2.56	$422
2026-10-13	31	$2.39	$74
2026-10-06	687	$2.45	$2K
2026-10-05	1	$2.34	$2
2026-09-25	1,708	$2.05	$4K
2026-09-21	652	$2.22	$1K
2026-09-09	275	$2.52	$693
2026-08-31	12,270	$2.58	$32K
2026-08-27	946	$2.65	$3K
2026-08-25	4,359	$2.64	$12K
2026-08-19	4,020	$2.59	$10K
2026-08-18	4,718	$2.79	$13K
2026-08-17	1,849	$2.60	$5K
2026-08-13	292	$2.35	$686
2026-08-12	13,854	$2.36	$33K
2026-08-11	2,000	$2.37	$5K
2026-08-10	1,876	$2.36	$4K
2026-08-06	7,295	$2.39	$17K
2026-08-04	492	$2.17	$1K
2026-07-30	4,023	$2.31	$9K
2026-07-27	1,135	$2.30	$3K
2026-07-23	1,459	$2.43	$4K
2026-07-21	5,816	$2.49	$14K
2026-07-16	159	$2.44	$388
2026-07-13	6,912	$2.37	$16K
2026-07-09	2,302	$2.45	$6K
2026-07-08	5,049	$2.49	$13K
2026-07-06	8,909	$2.12	$19K
2026-06-30	13,005	$1.98	$26K
2026-06-29	135	$1.88	$254

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for ATOS in the last 90 days. The most recent filings are listed below. Latest filing: Steinhart Richard I (Director) on 2026-05-12.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-05-12	Steinhart Richard I	Director	Grant	10K	$0.00	$0	10K
2026-05-12	Chen Shu-Chih	Director	Grant	10K	$0.00	$0	10K
2026-05-12	Remmel H. Lawrence	Director	Grant	10K	$0.00	$0	11K
2026-05-12	Finn Jonathan	Director	Grant	10K	$0.00	$0	12K
2026-05-12	Galli Stephen J	Director	Grant	10K	$0.00	$0	10K
2026-05-12	Cigler Tessa	Director	Grant	10K	$0.00	$0	10K
2026-03-27	QUAY STEVEN C	President & CEO	Grant	65K	$0.00	$0	88K
2026-03-26	Daniel Mark James	Chief Financial Officer	Grant	63K	$0.00	$0	63K
2026-01-20	QUAY STEVEN C	President & CEO	Grant	332K	$0.00	$0	346K
2026-01-20	QUAY STEVEN C	President & CEO	Grant	325K	$0.00	$0	339K
2025-05-21	QUAY STEVEN C	President & CEO	Buy	11K	$0.88	$10K	14K
2025-03-26	Remmel H. Lawrence	Director	Buy	10K	$0.70	$7K	10K
2024-04-10	Finn Jonathan	Director	Buy	25K	$1.77	$44K	25K
2023-11-15	WEAVER GREGORY L	Former EVP, CFO, & Director	Sell	50K	$0.65	$33K	55
2023-06-20	WEAVER GREGORY L	EVP & CFO	Buy	50K	$0.97	$49K	50K
2021-07-02	WEAVER GREGORY L	Director	Exercise or conversion	45K	$2.52	$113K	95K
2021-07-02	WEAVER GREGORY L	Director	Tax withholding	57K	$6.40	$365K	107K
2021-07-02	WEAVER GREGORY L	Director	Exercise or conversion	70K	$1.70	$119K	165K
2021-07-02	WEAVER GREGORY L	Director	Sell	107K	$5.58	$600K	0
2021-07-02	WEAVER GREGORY L	Director	Exercise or conversion	5K	$5.64	$26K	5K
2021-07-02	WEAVER GREGORY L	Director	Exercise or conversion	45K	$2.38	$107K	50K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

13F holders

Tracked managers holding ATOS at their latest 13F. JSON

2 of the 30 tracked managers held ATOS at their latest 13F, $345K in total at quarter-end prices. Renaissance Technologies is the largest at $255K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 1 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Renaissance Technologies	2026-06-30	132K	$255K	0.00%	+23K
Millennium Management	2026-06-30	47K	$90K	0.00%	-20K

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

Atossa Therapeutics 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 Atossa Therapeutics (ATOS), SEC CIK 1488039, listed on Nasdaq. 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 2026-10-15.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.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
Earnings dates: SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-07.JSON and CSV
Insider trades: SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-05-12.JSON and CSV
Company record: EDGAR filing index for CIK 1488039Ticker, 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 ATOS is sold short?

683,539 shares were held short at the 2026-10-15 settlement, 5.8 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 ATOS's daily short volume?

On 2026-11-02, 10,915 of the 19,493 ATOS shares reported to FINRA were sold short, 56.0% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ATOS have fails to deliver?

The SEC's latest file shows 165 ATOS shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.

Are ATOS insiders buying or selling?

No open-market insider trades were reported for ATOS in the last 90 days. The most recent filings are listed below. Latest filing: Steinhart Richard I (Director) on 2026-05-12.

Which tracked 13F managers own ATOS?

2 of the 30 tracked 13F managers held ATOS shares at their latest filing, $345K in all. The largest: Renaissance Technologies (132K shares, $255K), Izzy Englander's Millennium Management (47K shares, $90K).

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

Atossa Therapeutics (ATOS)

Short interest

Daily short volume

Fails to deliver

Insider trades

13F holders

Atossa Therapeutics in the regulatory record

Source and updates

How to read it

Other company pages

Datasets

Frequently Asked Questions