$ATRA
Atara Biotherapeutics, Inc
XNAS•Health Care•Biological Products, (No Diagnostic Substances)
Why is ATRA up today? It is at $9.70 (+3.41%), and our scanner flagged it 3 times on unusual volume this month. See the catalyst behind the move, real-time alerts the moment ATRA spikes, and full due diligence on ATRA — key stats, earnings, dilution and insider activity. Free.
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Key Stats
- Price
- $9.70
- Change today
- +3.41%
- Previous close
- $9.38
- 52-week range
- $3.92 – $19.14
- Market cap
- $97M
- Shares outstanding
- 10.0M SEC · as of 2026-08-10 · 13d
- Institutional own.
- 46.76%
- Total held
- 48.6%
- Tradeable float
- 5.2M 51% of shares · after 2% insiders + 47% institutions
- Short interest
- 537K ▼ -7% vs prior · as of 2026-07-31
- Short % of float
- 10.4%
- Days to cover
- 9.4d
- Avg daily volume
- 495K
- Sector
- Health Care
- Industry
- Biological Products, (No Diagnostic Substances)
- Exchange
- XNAS
- 5m
- 1.0x
- 15m
- 1.0x
- 1h
- 1.0x
- 1D
- --
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Why is $ATRA up today?
Here is the latest on ATRA from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for ATRA today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.
Analyst data via Nasdaq. Not investment advice.
Insiders
Insiders buying1 open-market buy4 buys, 1 sells last 3 months (7/11 over 12 months)Show 12 recent transactionsMinimize 12 recent transactions
| Insider | Action | Shares | % of position | Owns after | Value | Date |
|---|---|---|---|---|---|---|
Redmile Group, Llc Director | Sold (automatic/other) | -60 | sold <0.1% | 637K | n/a | Jul 22, 26 |
Redmile Group, Llc Director | Other | 195K 1.9% of company | added 44% | 637K | n/a | Jul 22, 26 |
Cherry Brian N Director | Acquired (grant/award) | +24K 0.2% of company | added 63% | 62K | n/a | Jun 11, 26 |
Ciongoli Gregory Austin Director | Acquired (grant/award) | +12K 0.1% of company | n/a | 12K | n/a | Jun 9, 26 |
Fust Matthew K Director | Acquired (grant/award) | +12K 0.1% of company | added 66% | 30K | n/a | Jun 9, 26 |
Heiden William K Director | Acquired (grant/award) | +12K 0.1% of company | added 54% | 34K | n/a | Jun 9, 26 |
Grant-Huerta Yanina Officer | Sold (automatic/other) | -2K 0.02% of company | sold 4.6% | 50K | $22K at $9.13 | May 18, 26 |
Nguyen Anhco Officer | Sold (automatic/other) | -5K 0.05% of company | sold 3.7% | 138K | $48K at $9.13 | May 18, 26 |
Ecor1 Capital, Llc Beneficial Owner (10%) | Bought (open market) | +507K 5.1% of company | added 49% | 1.55M | $4.7M at $9.35 | May 7, 26 |
Panacea Innovation Ltd Beneficial Owner (10%) | Sold (automatic/other) | -313K 3.1% of company | sold 19% | 1.32M | $3.2M at $10.10 | May 7, 26 |
Panacea Innovation Ltd Beneficial Owner (10%) | Sold (automatic/other) | -5 | sold <0.1% | 1.63M | $26 at $5.23 | Mar 17, 26 |
Panacea Innovation Ltd Beneficial Owner (10%) | Other | 259K 2.6% of company | added 100% | 308K | n/a | Mar 17, 26 |
Recent Form-4 filings via Nasdaq. Open-market buys are the signal worth watching. Grants and automatic (10b5-1) sells are routine. “% of position” is the share of that insider’s own holding the trade moved. Not investment advice.
Dilution watch
Active shelfRecent share offering + active shelf on file — the company raised capital and can raise more. If $ATRA runs, these filings show who may be positioned to sell new or newly-registered shares into the move.
Sourced from SEC EDGAR filings (last 9 months); terms read straight from the filing text where available. Ongoing = an at-the-market (ATM) program still selling over time or a live shelf, so it can keep diluting; Completed = a one-time priced sale that already finished. A shelf (S-3) stays effective ~3 years. Form type signals dilution capacity, not an exact share count, and we can't confirm how much of a shelf or ATM remains unused. Not investment advice.
$ATRA Sentiment
BullishBlend of news sentiment, today’s move, and community votes. Not investment advice.
$ATRA Activity
News, unusual-volume alerts, AI-trader trades and community chatter - the whole story, newest first.
Stocks similar to ATRA
Comparable names in biological products, (no diagnostic substances), closest in size first.
ATRA stock FAQ
Why is $ATRA up today?
Here is the latest on ATRA from our scanner (live price and day move above). We have not detected an unusual-volume catalyst for ATRA today, so it is trading in line with its recent range. The moment our scanner flags unusual activity, the reason will appear here.
What is the ATRA stock price today?
ATRA last traded at $9.70, up 3.41% on the day. The price and chart above update live during market hours (4 AM to 8 PM ET).
Where can I see live ATRA alerts?
The ATRA Live Alerts panel on this page streams real-time unusual volume (RVOL), momentum, halt and 200-EMA alerts from our scanner the moment they fire. Our scanner has flagged ATRA 3 times in the last 30 days.
What exchange is ATRA on?
ATRA (Atara Biotherapeutics, Inc) trades on XNAS, with a market cap of about $97M in the BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES) sector.
Is ATRA good for day trading?
That depends on your strategy and risk. Day traders look for volume, volatility and a clear trend. Use the live chart, RVOL alerts and 200-EMA context on this page to judge ATRA for yourself. This is not investment advice.
Live data from TheDesperateTrader scanner. Not investment advice.