Armata Pharmaceuticals ARMP Insider Ownership

NYSE ARMP

$3.08 -0.12 (-3.75%)

As of: Oct 21, 2026 · 3:59 PM EDT

Insider Holdings by Owner

16.58Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

0.560%

▼-0.038% pp QoQ

Shares Held by Insiders

207.88K

filed for Sep 2026

▼-6.33% QoQ

Shares Outstanding

37.15Mn

37,145,720 shares

Direct Holdings

207.88K

Indirect: 0

Net Shares Traded (QoQ)

-14.04K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the past 12 months, Armata Pharmaceuticals insiders made no open-market purchases or sales of the stock.

Away from the open market, ARMP insiders gave up 19.99K shares to cover taxes or exercise prices over the last 12 months.
Per Business Quant data, Armata Pharmaceuticals insiders hold 207.88K shares in total based on their latest Form 4 filings, down 6.33% from 221.92K shares at the end of Q2 2026 and down 12.61% from 237.87K shares at the end of Q3 2025.
ARMP's insiders hold all 207.88K shares directly, in their own names, with no indirect holdings.
Business Quant counts 2 insiders with holdings in Armata Pharmaceuticals stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Armata Pharmaceuticals' two largest insider shareholders, based on their latest Form 4 filings, are Deborah Birx (Chief Executive Officer, 198.42K shares) and Pierre Kyme (Chief Business Officer, 9.46K shares).
Of the shares held by ARMP insiders, 95.45% belong to Deborah Birx.
Institutional holders reported 13.41% of Armata Pharmaceuticals' outstanding shares for Q2 2026; insiders' latest Form 4 filings put their stake at about 0.56%, and other investors, including the public, hold the remaining 86.03%.
In the last 12 months, 13 Form 4 filings with transactions in ARMP stock came from 10 insiders.
This summary of Armata Pharmaceuticals insider activity covers Form 4 filings through July 14, 2026.

Form 4 Holdings

Insiders Holding ARMP

Insiders 4

Shares held 16.58Mn

Of outstanding 44.65%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Inc. Innoviva,	Director, TenPercentOwner	0	16,365,969	16,365,969	98.7%	01 Apr, 2022
2	Deborah Birx	Chief Executive Officer	198,417	0	198,417	1.2%	14 Jul, 2026
3	Richard Rychlik	Corporate Controller And Pfo	10,000	0	10,000	0.1%	18 Mar, 2024
4	Pierre Kyme	Chief Business Officer	9,461	0	9,461	0.1%	17 Mar, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

192 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
10 Jul, 2026	Deborah Birx	Chief Executive Officer	Disposed F	14,041	$4.26	$59.81K	198,417	Direct
24 Apr, 2026	Daniel B. Gilmer	Director	Acquired A	51,280	$0.00	$0	51,280	Direct
14 Mar, 2026	Pierre Kyme	Chief Business Officer	Disposed F	1,030	$10.54	$10.86K	9,461	Direct
14 Mar, 2026	Deborah Birx	Chief Executive Officer	Disposed F	4,919	$10.54	$51.85K	212,458	Direct
09 Mar, 2026	Jules Haimovitz	Director	Acquired A	25,640	$0.00	$0	25,640	Direct
09 Mar, 2026	Todd C. Peterson	Director	Acquired A	25,640	$0.00	$0	25,640	Direct
09 Mar, 2026	Robin Kramer	Director	Acquired A	25,640	$0.00	$0	25,640	Direct
09 Mar, 2026	Joseph M Patti	Director	Acquired A	25,640	$0.00	$0	25,640	Direct
09 Mar, 2026	David Duane House	Svp, Finance, And Pfo	Acquired A	109,885	$0.00	$0	109,885	Direct
09 Mar, 2026	Sarah J. Schlesinger	Director	Acquired A	25,640	$0.00	$0	25,640	Direct
09 Mar, 2026	Kostas D Odysseas	Director	Acquired A	25,640	$0.00	$0	25,640	Direct
09 Mar, 2026	Pierre Kyme	Chief Business Officer	Acquired A	183,142	$0.00	$0	183,142	Direct
09 Mar, 2026	Deborah Birx	Chief Executive Officer	Acquired A	421,226	$0.00	$0	421,226	Direct
10 Jul, 2025	Deborah Birx	Chief Executive Officer	Disposed F	13,637	$2.27	$30.96K	217,377	Direct
14 Mar, 2025	Pierre Kyme	Chief Business Officer	Disposed F	1,027	$1.95	$2.00K	10,491	Direct
05 Feb, 2025	Jules Haimovitz	Director	Acquired A	54,343	$0.00	$0	54,343	Direct
05 Feb, 2025	Pierre Kyme	Chief Business Officer	Acquired A	100,000	$0.00	$0	100,000	Direct
05 Feb, 2025	Robin Kramer	Director	Acquired A	54,343	$0.00	$0	54,343	Direct
05 Feb, 2025	Joseph M Patti	Director	Acquired A	54,343	$0.00	$0	54,343	Direct
05 Feb, 2025	Todd C. Peterson	Director	Acquired A	54,343	$0.00	$0	54,343	Direct

Showing 1 to 20 of 192 transactions