Cherry Brian N
Director
PurchaseAlert
- Shares
- 104,166
- Price
- $9.60
- Value
- $999,994
SEC EDGAR · Forms 3/4/5Updated through Oct 30, 2026•26 filings
ATRA
Atara Biotherapeutics, Inc.
Net purchases of $1000K over the last 3 months
1 buyer account for the net balance. There is no cluster of three distinct buyers within 30 days. We found no CEO/CFO purchases over 12 months.
How to read this signal
Only open-market P purchases and S sales count toward the signal. Vesting, options, taxes and gifts remain in the source data but do not trigger alerts. Rule 10b5-1 trades are shown as informational.
3-month balance
+$999,994
1 buyers · 0 sellers
12-month purchases
$5,744,249
2 distinct insiders
12-month sales
$3,654,040
2 distinct insiders
Highlighted alerts
5
0 Rule 10b5-1 trades treated as informational
Buying cluster · 30 days
Fewer than three distinct buyers
CEO/CFO purchases · 12 months
No executive purchases found
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Form 4 raw → Raspberry
The value is in what we do not call a signal.
The SEC XML stores every transaction. Raspberry keeps that evidence, reads the footnotes and separates voluntary open-market activity from vesting, option exercises, gifts, tax withholding, stock purchase and dividend reinvestment plans and pre-programmed 10b5-1 trades.
44
Raw transactions
Everything returned by the filing
5
Voluntary view
P/S trades after deterministic checks
39
Administrative noise
Stored, never alerted
0
10b5-1
Shown as informational
SEC ownership XML facts
- Code
- S
- Shares
- 5,062
- Price
- $8.08
- Footnotes
- 2
Shares sold automatically to satisfy tax withholding obligations in connection with the vesting of previously granted restricted stock units, pursuant to a sale-to-cover provision in the award agreement. The sale price of the reporting person's shares represents the weighted average price of all shares sold by a broker on August 17, 2026, on behalf of a group of employees of the Issuer to satisfy the payment of withholding tax liability of such employees.
Raspberry interpretation
Informational — no alert
Reason: tax_withholding. The filing footnotes identify tax withholding.
Recent transactions
Voluntary purchases and sales; administrative noise stays hidden.
Panacea Innovation Ltd
10% owner
SaleAlert
- Shares
- 313,446
- Price
- $10.10
- Value
- $3,165,021
EcoR1 Capital, LLC
10% owner
PurchaseAlert
- Shares
- 507,407
- Price
- $9.35
- Value
- $4,744,255
Panacea Innovation Ltd
10% owner
SaleAlert
- Shares
- 80,554
- Price
- $6.07
- Value
- $489,019
Panacea Innovation Ltd
10% owner
PurchaseAlert
- Shares
- 55,000
- Price
- $12.19
- Value
- $670,423
| Date | Insider | Transaction | Shares | Price | Value | Reading |
|---|---|---|---|---|---|---|
| Sep 04, 2026 | Cherry Brian N Director | Purchase | 104,166 | $9.60 | $999,994 | |
| May 07, 2026 | Panacea Innovation Ltd 10% owner | Sale | 313,446 | $10.10 | $3,165,021 | |
| May 07, 2026 | EcoR1 Capital, LLC 10% owner | Purchase | 507,407 | $9.35 | $4,744,255 | |
| Jan 12, 2026 | Panacea Innovation Ltd 10% owner | Sale | 80,554 | $6.07 | $489,019 | |
| Aug 15, 2025 | Panacea Innovation Ltd 10% owner | Purchase | 55,000 | $12.19 | $670,423 |
“Alert” means a voluntary, unscheduled transaction according to the filing; it is not an investment recommendation. Official source: SEC EDGAR.