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View all 33 holding institutions

Across its top 20 institutional holders, ATOS's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 6/100, avg. turnover score 30/100).

Notable Holders

ATOS ranks #7248 out of 37507 tracked stocks by institutional interest, inside the more closely watched half of our coverage.

ATOS is a disclosed holding of Jim Simons (Renaissance Technologies), one of the tracked superinvestors on AlphaSMO — it makes up 0.0% of that fund's own 13F portfolio.

33 institutions disclose a position in ATOS, but none treat it as a major bet — even Vanguard Capital Management LLC, its most concentrated holder, allocates just 0.0% of its own portfolio to it.

Company Fundamentals

ATOS reported a net loss of $37.7M over the trailing twelve months.

Not yet profitable — net loss of $37.7M over the trailing twelve months
Revenue declined 100.0% year over year
Net income declined year over year, from -$28.7M to -$37.7M
Operating cash flow was negative, using $29.8M in cash
Current ratio of 5.53x — enough short-term assets to cover short-term liabilities
Liabilities run 0.21x equity — within a conventional range

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Data Source Notice: AlphaSMO is the web's most authoritative 13F / Inside Trader database. Institutional holdings and insider trades presented here are precisely computed to deliver accurate portfolio reporting.

Price Chart

ATOS Quarterly 13F Institutional Trade Shifts

Recent Activity

+$253.1K

Total Buy Value

$136.6K

Total Sell Value

New buy5

Trim9

Add9

Sold out6

Net Buyers

Net Sellers

Top Movers

ATOS

Q2 2026

Top 5 Institutional Movers

Vanguard GroupAggregated

-$1.3M

Trim

Ameriprise Financial

-$843.6K

Trim

BlackRock

-$383.3K

Trim

Geode Capital Management

-$332.3K

Trim

UBS Group

-$324.6K

Trim

Data by AlphaSMO • Not financial advice.

Smart Money Convergence

ATOS does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.

13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.

Recent ATOS Insider Buying & Selling Activity (Form 4)

Congress Trading (STOCK Act)

Form 144 Pre-Sale Notices

No Form 144 planned sale filings in the last 90 days

Beneficial Ownership (13D/13G)

No Schedule 13D/13G filings for this ticker

Material Events (8-K)

Filings (14d)

Data as of 2026-08-07

2026-08-07

Atossa Therapeutics issued a press release on August 7, 2026, announcing its second-quarter 2026 financial results and providing a company update. This 8-K is essentially a routine filing to attach that press release; the actual figures and details are in Exhibit 99.1.

View Full Filing (SEC EDGAR)

View all Form 8-K filings

CUSIP

04962H704

FAQ

Who are the top institutional investors holding ATOSSA THERAPEUTICS INC (ATOS)?

Major stakeholders currently include Vanguard Capital Management LLC ($698.2K), Ameriprise Financial Inc ($498.4K), BlackRock, Inc. ($317.2K). Based on the latest 13F filings, there are a total of 33 tracked investment funds and institutions maintaining positions in ATOS.

What is the overall institutional sentiment toward ATOS recently?

Institutional sentiment appears Bullish (Net Buying). During the most recent reporting quarter, the stock experienced a net inflow of $123.8K, driven by 14 managers accumulating shares while 15 reduced their exposure.

Which institutions have been selling or reducing their ATOS positions?

In the latest period, 9 funds trimmed their holdings, and 6 managers completely exited their positions. The aggregate reported sell value was $136.6K.

Are there any notable investors adding ATOS to their portfolios?

Yes, buying activity remains notable. 5 institutions opened new positions in {ticker}, and 9 existing holders added to their shares. The total reported buy value for the quarter amounted to $253.1K.

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Developer Access

Access ATOS's institutional ownership data programmatically:

REST API

curl https://alphasmo.com/api/v1/market/stock/ATOS

CLI

npx alphasmo stocks get ATOS

Full API & MCP documentation →