ATOSNasdaqPharmaceutical PreparationsFiscal year ends December 31
ATOSSA THERAPEUTICS, INC.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 7, 2026
$2.56−0.35 (-12.03%)
Close on Oct 19, 2026
- Market cap
- $22.81M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
13.5%
1M of 10M shares
Institutional holders
31
5 new, 7 sold out
Net institutional buying
0M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of ATOS | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 361,747 | 3.62% | $698.17K | +12,651 | 0.00% |
| Ameriprise Financial Inc | 258,234 | 2.59% | $498.39K | +3,100 | 0.00% |
| BlackRock, Inc. | 164,358 | 1.65% | $317.21K | +31,189 | 0.00% |
| Renaissance Technologies LLC | 132,043 | 1.32% | $254.84K | +23,036 | 0.00% |
| Geode Capital Management, LLC | 92,382 | 0.93% | $178.34K | −4,679 | 0.00% |
| UBS Group AG | 82,620 | 0.83% | $159.46K | −9,414 | 0.00% |
| Jane Street Group, LLC | 56,602 | 0.57% | $109.24K | New | 0.00% |
| Vanguard Fiduciary Trust Co | 52,583 | 0.53% | $101.49K | +348 | 0.00% |
| Millennium Management LLC | 46,508 | 0.47% | $89.76K | −20,231 | 0.00% |
| State Street Corp | 39,761 | 0.40% | $76.74K | – | 0.00% |
| Northern Trust Corp | 20,249 | 0.20% | $39.08K | +1,025 | 0.00% |
| Susquehanna International Group, Llp | 15,574 | 0.16% | $30.06K | New | 0.00% |
| Morgan Stanley | 12,345 | 0.12% | $23.83K | −3,857 | 0.00% |
| Vanguard Global Advisers, LLC | 3,089 | 0.03% | $5.96K | – | 0.00% |
| Jones Financial Companies Lllp | 2,061 | 0.02% | $3.88K | – | 0.00% |
| Royal Bank of Canada | 1,994 | 0.02% | $4.00K | +1,350 | 0.00% |
| MCF Advisors LLC | 1,066 | 0.01% | $2.06K | New | 0.00% |
| Osaic Holdings, Inc. | 587 | 0.01% | $1.13K | – | 0.00% |
| JPMorgan Chase & Co | 390 | 0.00% | $772 | +7 | 0.00% |
| Rockefeller Capital Management L.P. | 333 | 0.00% | $643 | −20 | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 31 | 1M | 13.5% | 5 / 9 | 8 / 7 | 0M | 0M |
| Q1 2026 | 33 | 1M | 12.4% | 33 / 0 | 0 / 1 | 1M | 0M |
| Q4 2025 | 1 | 0M | 0.0% | 1 / 0 | 0 / 0 | 0M | 0M |
| Q3 2025 | 0 | 0M | 0.0% | 0 / 0 | 0 / 1 | 0M | 0M |
| Q2 2025 | 1 | 0M | 0.0% | 1 / 0 | 0 / 0 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of ATOS | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 256,137 | 2.57% | $494.34K | 0.00% | Jun 30, 2026 |
| Columbia Small Cap Value Discovery Fund | 201,434 | 2.02% | $416.97K | 0.02% | Jul 31, 2026 |
| Vanguard Extended Market Index Fund | 99,071 | 0.99% | $191.21K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 46,409 | 0.47% | $242.72K | 0.00% | May 31, 2026 |
| Columbia Variable Portfolio - Small Cap Value Discovery Fund | 36,383 | 0.36% | $70.22K | 0.02% | Jun 30, 2026 |
| iShares Micro-Cap ETF | 29,203 | 0.29% | $56.36K | 0.00% | Jun 30, 2026 |
| Fidelity Total Market Index Fund | 14,382 | 0.14% | $75.22K | 0.00% | May 31, 2026 |
| Fidelity Series Total Market Index Fund | 12,643 | 0.13% | $66.12K | 0.00% | May 31, 2026 |
| Vanguard Balanced Index Fund | 6,539 | 0.07% | $12.62K | 0.00% | Jun 30, 2026 |
| Fidelity Nasdaq Composite Index Fund | 4,211 | 0.04% | $22.02K | 0.00% | May 31, 2026 |
| 1290 VT Micro Cap Portfolio | 1,986 | 0.02% | $3.83K | 0.00% | Jun 30, 2026 |
| Diversified Equity Alpha Master Portfolio | 952 | 0.01% | $1.84K | 0.00% | Jun 30, 2026 |
| Blackstone Alternative Multi-Strategy Fund | -750 | -0.01% | -$1.45K | -0.00% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Steven C. Quay | President & CEO, Director | 89,521 | 0.90% | Mar 31, 2026 |
| Mark James Daniel | Chief Financial Officer | 63,000 | 0.63% | Mar 30, 2026 |
| Heather Rees | Chief Financial Officer | – | – | May 16, 2025 |
| Richard I. Steinhart | Director | 10,000 | 0.10% | May 14, 2026 |
| Jonathan Finn | Director | 11,666 | 0.12% | May 14, 2026 |
| Tessa Cigler | Director | 10,000 | 0.10% | May 14, 2026 |
| Shu-Chih Chen | Director | 11,483 | 0.12% | May 14, 2026 |
| Stephen J. Galli | Director | 10,006 | 0.10% | May 14, 2026 |
| H. Lawrence Remmel | Director | 12,683 | 0.13% | May 14, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Richard I. Steinhart Director | May 12, 2026 | Award | +10,000 | – | – | 10,000 |
| Stephen J. Galli Director | May 12, 2026 | Award | +10,000 | – | – | 10,006 |
| Tessa Cigler Director | May 12, 2026 | Award | +10,000 | – | – | 10,000 |
| H. Lawrence Remmel Director | May 12, 2026 | Award | +10,000 | – | – | 10,683 |
| Shu-Chih Chen Director | May 12, 2026 | Award | +10,000 | – | – | 10,000 |
| Jonathan Finn Director | May 12, 2026 | Award | +10,000 | – | – | 11,666 |
| Steven C. Quay President & CEO, Director | Mar 27, 2026 | Award | +65,000 | – | – | 88,038 |
| Mark James Daniel Chief Financial Officer | Mar 26, 2026 | Award | +63,000 | – | – | 63,000 |
| Steven C. Quay President & CEO, Director | Jan 20, 2026 | Award | +331,674 | – | – | 345,572 |
| Steven C. Quay President & CEO, Director | Jan 20, 2026 | Award | +325,203 | – | – | 339,101 |
| Steven C. Quay President & CEO, Director | May 21, 2025 | Buy | +11,239 | $0.88 | $9.89K | 13,898 |
| H. Lawrence Remmel Director | Mar 26, 2025 | Buy | +10,000 | $0.70 | $7.00K | 10,257 |
| Jonathan Finn Director | Apr 10, 2024 | Buy | +25,000 | $1.77 | $44.25K | 25,000 |
| Gregory L. Weaver Former EVP, CFO, & Director | Nov 15, 2023 | Sale | −50,000 | $0.65 | $32.50K | 55 |
| Gregory L. Weaver EVP & CFO, Director | Jun 20, 2023 | Buy | +50,000 | $0.97 | $48.50K | 50,055 |
| Gregory L. Weaver Director | Jul 2, 2021 | Tax withholding | −57,084 | $6.40 | $365.34K | 107,497 |
| Gregory L. Weaver Director | Jul 2, 2021 | Option exercise | +70,000 | $1.70 | $119.00K | 164,581 |
| Gregory L. Weaver Director | Jul 2, 2021 | Sale | −107,497 | $5.58 | $599.83K | 0 |
| Gregory L. Weaver Director | Jul 2, 2021 | Option exercise | +45,000 | $2.52 | $113.40K | 94,581 |
| Gregory L. Weaver Director | Jul 2, 2021 | Option exercise | +4,581 | $5.64 | $25.84K | 4,581 |
| Gregory L. Weaver Director | Jul 2, 2021 | Option exercise | +45,000 | $2.38 | $107.10K | 49,581 |
| Kyle Guse CFO, Gen Counsel and Secretary | Nov 15, 2017 | Buy | +8,600 | $0.34 | $2.92K | 8,600 |
| Kyle Guse CFO, Gen Counsel and Secretary | Nov 15, 2017 | Buy | +1,400 | $0.34 | $476 | 10,000 |
| H. Lawrence Remmel Director | Apr 17, 2017 | Buy | +2,500 | $0.63 | $1.58K | 3,126 |
| H. Lawrence Remmel Director | Apr 1, 2016 | Buy | +1,500 | $0.33 | $495 | 10,900 |
| Steven C. Quay President & CEO, Director, 10% owner | Mar 9, 2016 | Buy | +15,000 | $0.37 | $5.55K | 4,826,858 |
| Shu-Chih Chen Director, 10% owner | Mar 9, 2016 | Buy | +15,000 | $0.37 | $5.55K | 4,348,315 |
| Steven C. Quay President & CEO, Director, 10% owner | Feb 16, 2016 | Buy | +15,000 | $0.53 | $7.95K | 4,811,858 |
| Shu-Chih Chen Director, 10% owner | Feb 16, 2016 | Buy | +15,000 | $0.53 | $7.95K | 4,333,315 |
| Steven C. Quay President & CEO, Director, 10% owner | Jan 19, 2016 | Buy | +50,000 | $0.20 | $10.00K | 4,796,858 |
| Shu-Chih Chen Director, 10% owner | Jan 19, 2016 | Buy | +50,000 | $0.20 | $10.00K | 4,318,315 |
| H. Lawrence Remmel Director | Jun 12, 2015 | Buy | +5,400 | $1.30 | $7.02K | 9,400 |
| Gregory L. Weaver Director | May 6, 2014 | Returned to company | −24,510 | – | – | 0 |
| Richard I. Steinhart Director | May 6, 2014 | Returned to company | −22,728 | – | – | 0 |
| Richard I. Steinhart Director | Mar 1, 2014 | Award | +22,728 | – | – | 22,728 |
| Gregory L. Weaver Director | Nov 21, 2013 | Buy | +10,000 | $2.58 | $25.80K | 34,510 |
| Gregory L. Weaver Director | Oct 10, 2013 | Award | +24,510 | – | – | 24,510 |
| Shu-Chih Chen Chief Scientific Officer, Director, 10% owner | Oct 1, 2013 | Sale(10b5-1 plan) | −7,265 | $5.66 | $41.12K | 4,268,315 |
| Steven C. Quay CEO, Director, 10% owner | Oct 1, 2013 | Sale(10b5-1 plan) | −7,265 | $5.66 | $41.12K | 4,268,315 |
| Shu-Chih Chen Chief Scientific Officer, Director, 10% owner | Jul 18, 2013 | Gift | −5,000 | – | – | 478,543 |
| Shu-Chih Chen Chief Scientific Officer, Director, 10% owner | Jul 18, 2013 | Gift | −100,000 | – | – | 483,543 |
| Steven C. Quay Chief Executive Officer, Director, 10% owner | Jul 18, 2013 | Gift | −5,000 | – | – | 478,543 |
| Steven C. Quay Chief Executive Officer, Director, 10% owner | Jul 18, 2013 | Gift | −100,000 | – | – | 483,543 |
| Shu-Chih Chen Chief Scientific Officer, Director, 10% owner | May 28, 2013 | Gift | −1,000 | – | – | 583,543 |
| Steven C. Quay Chief Executive Officer, Director, 10% owner | May 28, 2013 | Gift | −1,000 | – | – | 583,543 |
| Alexander D. Cross Director | May 15, 2013 | Buy | +500 | $5.49 | $2.75K | 88,866 |
| H. Lawrence Remmel Director | Jan 8, 2013 | Buy | +1,600 | $4.20 | $6.72K | 2,000 |
| H. Lawrence Remmel Director | Jan 8, 2013 | Buy | +400 | $4.10 | $1.64K | 400 |
| H. Lawrence Remmel Director | Jan 8, 2013 | Buy | +2,000 | $4.05 | $8.10K | 2,000 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.