What is ATRA's dilution risk score?

ATRA has a latest available DilutionScore record of 76/100, categorized as critical dilution risk by the DilutionWatch scoring model. DilutionWatch displays SEC filing and dilution indicators for ATRA, including shelf registrations, ATM offerings, warrant exercises, PIPE deals, and reverse split signals when detected in source data.

What SEC filings does DilutionWatch track for ATRA?

DilutionWatch tracks 25 SEC filing types for ATRA including S-3 shelf registrations, 424B prospectuses (ATM offerings), S-1 registration statements, 8-K material events, warrant exercise notices, convertible note agreements, and Form 4 insider transactions. Alerts are delivered via email within minutes of a filing appearing on EDGAR.

How does stock dilution affect ATRA shareholders?

Stock dilution occurs when a company issues new shares, reducing the ownership percentage of existing shareholders. For ATRA, common dilution events include at-the-market (ATM) stock offerings, shelf registration drawdowns, warrant exercises, and convertible note conversions. Each event increases the share count and can pressure the stock price lower.

Is DilutionWatch free for ATRA tracking?

DilutionWatch provides a free tier that shows DilutionScores and basic filing history for ATRA. Premium plans ($19.95/month Basic, $39.95/month Premium) unlock real-time email alerts, the full Pulse™ feed, advanced dilution forecasts, and access to all 10,000+ tracked tickers.

ATRA Dilution Risk Score: 76/100 (CRITICAL)

Score Breakdown

📋 Offering Ability

66

💰 Cash Runway

95

📊 Float Risk

50

⚠️ Warrant Exposure

15

🔄 Convertible Debt

40

Dilution Forecast

🌩️

Severe

Multiple high-probability dilution events detected

model est. 51%

💰 Capital Raise model 93%

• Critical: only 1.2 months cash remaining

• Active shelf registration ($9M, 10% of market cap)

📉 Score Deterioration model 15%

• Score already CRITICAL (76/100) — events likely imminent

🔔 Track ATRA — Get forecast alerts →

Market Data

Market Cap$94.70M

Shares Outstanding10.04M

Float4.74M

Cash$9.87M

DebtN/A

Short InterestN/A

Institutional Holdings

QoQ: ↑ 37.9% shares (2026Q1 vs prior)

35 institutional holders · 2.83M shares

#1 ADAGE CAPITAL PARTNERS GP, L.L.C. 700.0K shares

#2 Redmile Group, LLC 441.7K shares

#3 VANGUARD CAPITAL MANAGEMENT LLC 435.7K shares

+ 17 more holders Sign up free to view →

Institutional holder totals are aggregated from ownership filings and may use a different share basis or reporting date than public float. They are not a reconciliation against tradeable float.

Short Interest

Short Interest536.9K

Days to Cover9.4

% of Float11.3%

FINRA data as of Jul 31, 2026

Insider Buy/Sell Ratio

Recent SEC Activity

xbrl XBRL CONVERTIBLE 2014-12-31

Form 4 INSIDER TRANSACTION 2026-08-17

424B3 ATM 2026-03-25

EFFECT EFFECT 2026-03-25

4 INSIDER TRANSACTION 2026-03-19

Full SEC filing analysis available with free account →

Recent News

No recent news

Factual ATRA Dilution Snapshot

Atara Biotherapeutics, Inc. (ATRA) has a DilutionScore of 76/100, rated Critical dilution risk. Score date: August 28, 2026.

Stored shelf registration capacity: $9.0M.
Stored ATM program remaining capacity: $11.1M.
Recent SEC activity tracked for ATRA: Form 4 on 2026-08-17; 424B3 on 2026-03-25; EFFECT on 2026-03-25.

This automatically generated snapshot is assembled from stored DilutionWatch data fields and may contain data-source errors or omissions. It is not financial advice, not investment research, and not a recommendation. Do your own research and review the full disclaimer and terms of service.