Atara Biotherapeutics (ATRA) stock: insider trades, news & valuation
Health Care · Net buyingShare price and insider trades
Atara Biotherapeutics insider trading at a glance (Oct 9, 2026): in the past 12 months, 2 insiders bought $5.7M and 4 sold $3.9M of ATRA stock on the open market.
Get emailed when insiders cluster-buy stocks like ATRA
Free alerts the day a new cluster buy is filed, plus the Monday report of the week's biggest insider trades.
Free · unsubscribe anytime · not investment advice · see a sample issue
ATRA insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | $1000K | 1 | $41K | 1 |
| Q2 2026 | $4.7M | 1 | $3.2M | 3 |
| Q1 2026 | — | 0 | $515K | 9 |
| Q4 2025 | — | 0 | $62K | 5 |
Valuation, profit and volume
Summary
Over the past 12 months, 2 Atara Biotherapeutics, Inc. insiders reported open-market purchases totaling $5.7M, while 4 insiders reported sales totaling $3.9M. Among insiders with enough purchase history to measure, James Huang (Director) has the highest Insider Score at 30. 0 of 18 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
ATRA stock news and SEC filings
Recent 8-K filings and headlines. Tone is scored from the headline wording; “Policy” marks regulatory, trade or government topics.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Sep 4SEC | Brian N CherryDirector | Buy | 104,166166,486 held (+167%) | $9.60 | $1000K | -1.2% | — |
| Aug 26SEC | Anhco NguyenCEO, President | Sell | 5,062132,775 held (−4%) | $8.08 | $41K | +17.3% | — |
| May 20SEC | Anhco NguyenCEO, President | Sell | 5,241137,837 held (−4%) | $9.13 | $48K | +3.8% | — |
| May 20SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 2,41449,636 held (−5%) | $9.13 | $22K | +3.8% | — |
| May 11SEC | Ecor1 Capital, Llc10% Owner | Buy | 507,4071,552,000 held (+49%) | $9.35 | $4.7M | +1.4% | — |
| May 11SEC | Innovation Ltd Panacea10% Owner | Sell | 313,4461,011,000 held (−24%) | $10.10 | $3.2M | -6.1% | — |
| Mar 4SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 1,60332,227 held (−5%) | $5.08 | $8K | +86.6% | — |
| Mar 4SEC | Anhco NguyenCEO, President | Sell | 1,44261,978 held (−2%) | $5.09 | $7K | +86.2% | — |
| Mar 4SEC | Anhco NguyenCEO, President | Sell | 1,29863,420 held (−2%) | $5.09 | $7K | +86.2% | — |
| Mar 4SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 37731,850 held (−1%) | $5.08 | $2K | +86.6% | — |
| Mar 4SEC | Anhco NguyenCEO, President | Sell | 19864,776 held (−0%) | $5.08 | $1K | +86.6% | — |
| Mar 4SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 10031,750 held (−0%) | $5.08 | $508 | +86.6% | — |
| Mar 4SEC | Anhco NguyenCEO, President | Sell | 5864,718 held (−0%) | $5.08 | $295 | +86.6% | — |
| Mar 4SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 2433,830 held (−0%) | $5.08 | $122 | +86.6% | — |
| Jan 14SEC | James HuangDirector | Sell | 80,5541,324,446 held (−6%) | $6.07 | $489K | +56.2% | 30 |
| Nov 19SEC | Anhco NguyenCEO, President | Sell | 2,85965,030 held (−4%) | $13.19 | $38K | -28.1% | — |
| Nov 19SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 1,64533,613 held (−5%) | $13.19 | $22K | -28.1% | — |
| Nov 19SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 8533,528 held (−0%) | $13.19 | $1K | -28.1% | — |
| Nov 19SEC | Yanina Grant-huertaChief Accounting Officer | Sell | 7433,454 held (−0%) | $13.19 | $976 | -28.1% | — |
| Nov 19SEC | Anhco NguyenCEO, President | Sell | 5664,974 held (−0%) | $13.19 | $739 | -28.1% | — |
Insiders at Atara Biotherapeutics, Inc.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Ecor1 Capital, Llc10% Owner | $4.7M | — | May 11, 2026 | — |
| Innovation Ltd Panacea10% Owner | — | $3.2M | May 11, 2026 | — |
| Brian N CherryDirector | $1000K | — | Sep 4, 2026 | — |
| James HuangDirector | — | $489K | Jan 14, 2026 | 30 |
| Anhco NguyenCEO, President | — | $142K | Aug 26, 2026 | — |
| Yanina Grant-huertaChief Accounting Officer | — | $57K | May 20, 2026 | — |
Insider activity at other Health Care companies
Same sector, ranked by insider buying in the last 90 days.
ATRA stock: common questions
Are Atara Biotherapeutics, Inc. insiders buying ATRA stock?
In the past 12 months, 2 insiders reported open-market purchases of ATRA worth $5.7M. The latest was Director Brian N Cherry bought $1000K of ATRA at $9.60 — first open-market purchase in our records; raises the stake by 167%.
Are Atara Biotherapeutics, Inc. insiders selling ATRA stock?
4 insiders reported sales worth $3.9M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is ATRA's 52-week range?
Over the past year ATRA has traded between $4.18 and $18.09. It last closed at $9.48 on Oct 9, 2026.