Atara director reports 38,320-share initial holding

Atara Biotherapeutics, Inc. director Brian N. Cherry filed an initial ownership report showing his holdings in the company’s common stock.

Rhea-AI Filing Summary

Atara Biotherapeutics, Inc. director Brian N. Cherry filed an initial ownership report showing his holdings in the company’s common stock. The filing lists direct ownership of 38,320 shares of Common Stock after the reported holdings, with no specific buy or sell transaction disclosed.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Cherry Brian N

Role Director

Type	Security	Shares	Price	Value
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 38,320 shares (Direct)

Key Figures

Common Stock holdings: 38,320 shares

1 metrics

Common Stock holdings 38,320 shares Total shares directly owned after reported holdings on Form 3

Key Terms

Common Stock, Form 3, reporting person

3 terms

Common Stock financial

"security_title: "Common Stock" is listed for the reported holding entry."

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 3 regulatory

"Insider filing data is identified as a Form 3 initial beneficial ownership statement."

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

reporting person regulatory

"The filing lists Brian N. Cherry as a reporting person and director of the issuer."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Brian N. Cherry’s Form 3 filing for ATRA show?

The Form 3 filing shows that Brian N. Cherry, a director of Atara Biotherapeutics, directly holds 38,320 shares of Common Stock. It is an initial ownership report and does not reflect a new purchase or sale transaction.

How many Atara Biotherapeutics (ATRA) shares does Brian N. Cherry own?

Brian N. Cherry is reported as directly owning 38,320 shares of Atara Biotherapeutics Common Stock. This figure appears as the total shares following the reported holdings in the Form 3 initial beneficial ownership statement.

Is Brian N. Cherry a ten percent owner of Atara Biotherapeutics (ATRA)?

No, the Form 3 indicates Brian N. Cherry is a director but not a ten percent owner. The filing flags him as a director only, with no indication that his 38,320 directly held shares reach ten percent ownership.

Does the ATRA Form 3 for Brian N. Cherry show any recent stock transactions?

The Form 3 does not show a specific buy or sell transaction. It classifies the entry as a holding, listing 38,320 shares of Common Stock directly owned after the reported holdings, rather than detailing a new trade.

Are Brian N. Cherry’s ATRA shares held directly or indirectly?

The Form 3 classifies Brian N. Cherry’s 38,320 Atara Biotherapeutics shares as directly owned. The ownership code is marked as "D" for direct, with no indirect entity, trust, or partnership structure referenced in the holding entry.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Understanding Insider Trading Forms →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 06/15/2026 - 06:48 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Cherry Brian N

(Last) (First) (Middle)

C/O ATARA BIOTHERAPEUTICS, INC.

1280 RANCHO CONEJO BOULEVARD

(Street)

THOUSAND OAKS CALIFORNIA 91320

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
06/11/2026

3. Issuer Name and Ticker or Trading Symbol
Atara Biotherapeutics, Inc. [ ATRA ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	38,320	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

	/s/ John Chao, Attorney-in-Fact for Brian Cherry	06/15/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)