Armata Pharmaceuticals (ARMP)

Armata Pharmaceuticals on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE.

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900K

Short interest

settlement 2026-10-15

8.5

Days to cover

+2.5 days vs prior

50.9%

Short share of volume

2026-11-02

1,460

Fails to deliver

settlement 2026-10-08

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 ARMP is 899,639 shares, down 63,744 shares over the last month. Over the last 48 readings it ranged from 2,682 shares (29 November 2024) to 964,187 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 105K shares a day that is 8.5 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-10-15	899,639	-6.7%	105,326	8.54
2026-09-30	964,187	+0.1%	160,890	5.99
2026-09-15	963,383	+8.8%	583,217	1.65
2026-08-31	885,291	+6.1%	101,940	8.68
2026-08-14	834,737	-2.5%	130,045	6.42
2026-07-31	856,363	+21.5%	171,953	4.98
2026-07-15	704,657	+59.7%	154,722	4.55
2026-06-30	441,157	+113.3%	302,873	1.46
2026-06-15	206,873	-1.2%	53,575	3.86
2026-05-29	209,363	-7.0%	84,420	2.48
2026-05-15	225,033	-2.2%	77,207	2.91
2026-04-30	230,017	-5.8%	79,680	2.89
2026-04-15	244,306	-18.0%	55,070	4.44
2026-03-31	297,898	-4.2%	30,843	9.66
2026-03-13	310,810	+4.3%	33,179	9.37
2026-02-27	298,102	-0.1%	66,765	4.46
2026-02-13	298,337	+8.5%	44,863	6.65
2026-01-30	274,891	+23.8%	41,454	6.63
2026-01-15	222,054	+53.8%	75,408	2.94
2025-12-31	144,352	+7.7%	27,287	5.29
2025-12-15	133,987	+2.1%	58,701	2.28
2025-11-28	131,252	-16.5%	69,711	1.88
2025-11-14	157,247	+410.1%	131,974	1.19
2025-10-31	30,828	+40.3%	1,242,999	1.00
2025-10-15	21,970	-8.3%	10,537	2.09
2025-09-30	23,958	-14.2%	8,433	2.84
2025-09-15	27,906	-24.1%	14,859	1.88
2025-08-29	36,748	-25.8%	9,704	3.79
2025-08-15	49,502	-1.9%	8,376	5.91
2025-07-31	50,466	-24.9%	12,417	4.06
2025-07-15	67,235	-35.1%	16,992	3.96
2025-06-30	103,565	-22.8%	22,013	4.70
2025-06-13	134,133	-25.0%	21,100	6.36
2025-05-30	178,806	+4178.7%	1,451,829	1.00
2025-05-15	4,179	-44.5%	12,128	1.00
2025-04-30	7,525	+20.5%	9,172	1.00
2025-04-15	6,245	+71.9%	33,480	1.00
2025-03-31	3,633	-52.8%	23,389	1.00
2025-03-14	7,691	+27.3%	9,431	1.00
2025-02-28	6,043	-14.3%	13,476	1.00
2025-02-14	7,052	-62.1%	7,188	1.00
2025-01-31	18,609	+7.9%	8,345	2.23
2025-01-15	17,251	-6.6%	12,872	1.34
2024-12-31	18,477	+204.8%	18,453	1.00
2024-12-13	6,062	+126.0%	6,595	1.00
2024-11-29	2,682	-66.3%	11,581	1.00
2024-11-15	7,950	+75.1%	11,220	1.00
2024-10-31	4,540	-23.5%	5,583	1.00

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of ARMP volume is 50.9%, down 2.3 points over the last five sessions. Over the last 30 readings it ranged from 29.4% (22 September 2026) to 88.8% (22 October 2026). The latest reading is 15.9 points below the 30-session average of 66.8%, on 40K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-11-02	21K	40K	50.9%	1,248
2026-10-30	7K	10K	74.5%	0
2026-10-29	31K	48K	64.3%	0
2026-10-28	19K	31K	61.4%	0
2026-10-27	25K	35K	71.0%	0
2026-10-26	14K	26K	53.1%	0
2026-10-23	23K	31K	71.6%	0
2026-10-22	39K	44K	88.8%	0
2026-10-21	37K	46K	80.7%	0
2026-10-20	25K	32K	80.4%	0
2026-10-19	44K	52K	83.8%	0
2026-10-16	22K	56K	39.9%	0
2026-10-15	53K	61K	87.1%	7,634
2026-10-14	39K	50K	78.3%	9,194
2026-10-13	46K	86K	53.2%	8,813
2026-10-12	13K	22K	60.0%	0
2026-10-09	26K	34K	78.5%	0
2026-10-08	18K	30K	59.2%	0
2026-10-07	27K	31K	85.5%	0
2026-10-06	41K	50K	82.1%	0
2026-10-05	14K	18K	80.6%	0
2026-10-02	31K	44K	69.1%	1,573
2026-10-01	15K	19K	77.5%	0
2026-09-30	15K	42K	36.2%	0
2026-09-29	21K	45K	46.8%	0
2026-09-28	21K	29K	71.3%	0
2026-09-25	14K	37K	38.9%	16
2026-09-24	47K	64K	73.2%	3,260
2026-09-23	95K	124K	76.7%	20,211
2026-09-22	14K	48K	29.4%	0

Fails to deliver

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

As of 8 October 2026, the fails-to-deliver balance in ARMP is 1,460 shares, down 2,856 shares over the last settlement date. Over the last 30 readings it ranged from 3 shares (24 July 2026) to 10,367 shares (24 June 2026).

Settlement	Shares failed	Price	Value
2026-10-08	1,460	$3.81	$6K
2026-10-02	4,316	$3.31	$14K
2026-10-01	2,905	$3.67	$11K
2026-09-30	2,318	$3.59	$8K
2026-09-28	508	$3.74	$2K
2026-09-24	2,194	$3.64	$8K
2026-09-18	250	$4.10	$1K
2026-09-17	250	$4.07	$1K
2026-09-16	5,098	$4.40	$22K
2026-09-15	4,815	$5.55	$27K
2026-09-14	418	$5.38	$2K
2026-09-11	900	$5.23	$5K
2026-09-10	981	$5.41	$5K
2026-09-04	2,116	$5.52	$12K
2026-08-28	9	$5.43	$49
2026-08-27	1,426	$5.45	$8K
2026-08-24	2,394	$5.10	$12K
2026-08-20	4,159	$5.07	$21K
2026-08-04	899	$5.05	$5K
2026-07-28	671	$5.15	$3K
2026-07-24	3	$5.22	$16
2026-07-23	1,772	$5.24	$9K
2026-07-22	483	$5.16	$2K
2026-07-20	92	$4.51	$415
2026-07-17	2,294	$3.76	$9K
2026-07-02	1,239	$5.88	$7K
2026-06-26	7	$6.50	$46
2026-06-24	10,367	$7.01	$73K
2026-06-22	308	$7.08	$2K
2026-06-15	3,950	$7.58	$30K

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for ARMP in the last 90 days. The most recent filings are listed below. Latest filing: Birx Deborah (Chief Executive Officer) on 2026-07-10.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-07-10	Birx Deborah	Chief Executive Officer	Tax withholding	14K	$4.26	$60K	198K
2026-03-14	Kyme Pierre	Chief Business Officer	Tax withholding	1K	$10.54	$11K	9K
2026-03-14	Birx Deborah	Chief Executive Officer	Tax withholding	5K	$10.54	$52K	212K
2025-07-10	Birx Deborah	Chief Executive Officer	Tax withholding	14K	$2.27	$31K	217K
2025-03-14	Kyme Pierre	Chief Business Officer	Tax withholding	1K	$1.95	$2K	10K
2025-03-14	Birx Deborah	Chief Executive Officer	Tax withholding	6K	$1.95	$12K	231K
2024-07-10	Birx Deborah	Chief Executive Officer	Tax withholding	23K	$2.68	$61K	237K
2024-03-14	Birx Deborah	Chief Executive Officer	Grant	60K	$0.00	$0	260K
2024-03-14	Rychlik Richard	Corporate Controller and PFO	Grant	10K	$0.00	$0	10K
2023-12-21	Birx Deborah	Chief Executive Officer	Grant	200K	$0.00	$0	200K
2022-03-31	Innoviva, Inc.	Director,TenPercentOwner	Buy	5.4M	$5.00	$26.9M	16.4M
2022-02-09	Innoviva Strategic Opportunities LLC	Director,TenPercentOwner	Buy	3.6M	$5.00	$18.1M	11.0M
2021-10-29	Innoviva Strategic Opportunities LLC	Director,TenPercentOwner	Buy	1.2M	$3.30	$4.0M	7.4M
2021-03-17	Innoviva, Inc.	Director,TenPercentOwner	Buy	4.3M	$3.25	$13.9M	6.2M
2021-01-26	Innoviva Strategic Opportunities LLC	Director,TenPercentOwner	Buy	1.9M	$3.25	$6.1M	1.9M
2020-03-27	Innoviva, Inc.	TenPercentOwner	Buy	7.7M	$2.87	$22.1M	8.7M

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.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

2 holders report 5% or more of ARMP in their latest filing, all on Schedule 13D (active intent). The largest reported stake is Innoviva, Inc. at 82.7% of the class (55,467,459 shares), filed 2026-05-13 for an event on 2026-05-12.

Filed	Form	Holder	Shares	Of class	Event
2026-05-13	13D/Ano. 15	Innoviva, Inc.corporation	55.5M	82.7%	2026-05-12
2026-05-13	13D/Ano. 15	Innoviva Strategic Opportunities LLCother entity	46.8M	69.7%	2026-05-12

13F holders

Tracked managers holding ARMP at their latest 13F. JSON

2 of the 30 tracked managers held ARMP at their latest 13F, $3.4M in total at quarter-end prices. Millennium Management is the largest at $3.0M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 0 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Millennium Management	2026-06-30	471K	$3.0M	0.00%	+213K
Renaissance Technologies	2026-06-30	48K	$313K	0.00%	+10K

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

Armata Pharmaceuticals 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 Armata Pharmaceuticals (ARMP), SEC CIK 921114, listed on NYSE. 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 2026-10-08.JSON and CSV
Large holders: SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-05-13.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 2026-08-12.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 2026-07-10.JSON and CSV
Company record: EDGAR filing index for CIK 921114Ticker, 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 ARMP is sold short?

899,639 shares were held short at the 2026-10-15 settlement, 8.5 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 ARMP's daily short volume?

On 2026-11-02, 20,588 of the 40,470 ARMP shares reported to FINRA were sold short, 50.9% of the day's reported volume. Short volume is a flow for one day, not a position.

Does ARMP have fails to deliver?

The SEC's latest file shows 1,460 ARMP shares failed to deliver at settlement 2026-10-08. Fails are reported per settlement date and published twice a month with a lag.

Are ARMP insiders buying or selling?

No open-market insider trades were reported for ARMP in the last 90 days. The most recent filings are listed below. Latest filing: Birx Deborah (Chief Executive Officer) on 2026-07-10.

Who owns 5% or more of ARMP?

Which tracked 13F managers own ARMP?

2 of the 30 tracked 13F managers held ARMP shares at their latest filing, $3.4M in all. The largest: Izzy Englander's Millennium Management (471K shares, $3.0M), Renaissance Technologies (48K shares, $313K).

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

Armata Pharmaceuticals (ARMP)

Short interest

Daily short volume

Fails to deliver

Insider trades

Large holders (13D and 13G)

13F holders

Armata Pharmaceuticals in the regulatory record

Source and updates

How to read it

Other company pages

Datasets

Frequently Asked Questions