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Atara Biotherapeutics (ATRA): which funds own it

Health Care →(by SIC code, unreviewed)Data as of Jun 30, 2026 (Q2 2026) · updated on Nov 5, 2026

A 13F shows the portfolio at quarter-end and is filed up to 45 days later: these are not real-time positions and they may have changed.

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Sections with a free account

2 concentrated managers hold it with a median weight of 0.6%. 1 officer or director bought in 6 months.

Who owns Atara Biotherapeutics?

Holders that filed a Schedule 13D or 13G with the SEC for owning more than 5% of the shares: EcoR1 Capital (13G/A filed May 7, 2026), Redmile Group (13D/A filed Jul 24, 2026), Panacea Venture Healthcare Fund II (13G filed Feb 6, 2025), Adage Capital Management (13G filed May 13, 2026) and Point72 Asset Management (13G/A filed Aug 14, 2026). Huang James is listed on Form 4 filings as an owner of more than 10%. As of Jun 30, 2026, the largest holders reported on Form 13F were EcoR1 Capital (1.6 million shares), Adage Capital Partners Gp, L.l.c (850,000 shares) and Point72 Asset Management (687,718 shares).

Which institutions hold the most Atara Biotherapeutics shares?

Per Form 13F filings as of Jun 30, 2026:

  1. 1. EcoR1 Capital: 1.6 million shares
  2. 2. Adage Capital Partners Gp, L.l.c: 850,000 shares
  3. 3. Point72 Asset Management: 687,718 shares
  4. 4. Redmile Group: 441,701 shares
  5. 5. Vanguard Capital Management: 247,047 shares
  6. 6. Mackenzie Financial: 233,249 shares
  7. 7. BlackRock: 84,455 shares
  8. 8. Geode Capital Management: 75,128 shares
  9. 9. Staley Capital Advisers: 50,000 shares
  10. 10. Vanguard Fiduciary Trust: 43,036 shares

Sources:13G/A by EcoR1 Capital (May 7, 2026) ↗13D/A by Redmile Group (Jul 24, 2026) ↗13G by Panacea Venture Healthcare Fund II (Feb 6, 2025) ↗13G by Adage Capital Management (May 13, 2026) ↗13G/A by Point72 Asset Management (Aug 14, 2026) ↗All of the company's proxy statements on EDGAR ↗

We hold 13D and 13G filings made since Dec 23, 2024: a holder above 5% that has not filed since then does not appear here.

Atara Biotherapeutics revenue

Atara Biotherapeutics reported annual revenue of $120.8 million for fiscal year 2025 (year ended December 31, 2025), according to its Form 10-K filed with the SEC (XBRL data).

Concentrated managers
2
All 13F: 35
Consensus
—
No score: it needs 5 or more concentrated managers
Price at Jun 30, 2026 (per 13F)
$11.48
+142.7% in the quarter · reported value ÷ shares, not the quote · See current quote ↗

Quarter flow (concentrated managers)

Change in managers (2 → 2): 0 opened · 0 exited = 0

Net flow in the quarter: +$16.7M (+1.5 M shares) · bought $16.7M and sold $0Shares concentrated managers added minus those they cut, valued at the 13F quarter-end implied price, not each trade's price. It is a different measure from the change in managers: the two can have opposite signs.

Concentrated managers holding it

Up to 15, sorted by position value. The percentage is the weight in each manager's portfolio.

Largest holders of ATRA (all 13F filers)

The 10 13F filers with the most shares as of Jun 30, 2026, whatever their type (index firms usually come first). “Change”: shares added or cut versus the previous quarter, split-adjusted; “no data” = there is no comparable portfolio for the previous quarter (no filing, or a filing with its holdings under confidential treatment). “% of the company” only where shares outstanding are up to date. Entities of the same group file separately and some 13F filings include other managers: there may be double counting. With a free account: the top 25, the largest buyers and the largest sellers.

Fundamentals

12-month figures to Jun 30, 2026 · balance sheet as of Jun 30, 2026.

Profitability
Operating margin
—
Net margin
—
ROE
—
Growth
Revenue (TTM)
$6.2M
Revenue growth
-96.7%
Net income (TTM)
$-16.7M
Balance sheet
Net debt / EBITDA
—
Free cash flow (TTM)
—
Quality vs sector
—

This company's sector comes from its SIC code, unreviewed, or has too few comparable companies: we do not compare it with its sector.

Figures from the statements the company filed with the SEC (10-K, 10-Q). Free cash flow = operating cash flow − capital expenditures; empty if the company does not report capex. “Quality vs sector”: 0 to 100, the average of its percentiles in ROE, operating margin, free-cash-flow margin, revenue and earnings growth and net debt / EBITDA (at least 3 needed) against companies in its sector above $300M. How each figure is calculated

Shares outstanding: buybacks and dilution

Diluted shares by fiscal year (split-adjusted)

2025: 12.7 M

102.0 M0
20202025

There is a jump that may be an undetected split: we do not show the changes.

Buybacks (FY 2025)
no data
Share issuance
$1.5M
Stock-based compensation
$9.8M8.1% of revenue
Dividends paid
no data

From the statements the company filed with the SEC (10-K). The change compares average diluted shares of each fiscal year, on today's basis: negative = it bought back more than it issued; positive = dilution. “No data” = the company does not report that item under a tag we can read; it does not mean zero.

Earnings quality and debt

Operating cash flow ÷ net income (12 months)
no datanot calculated with negative net income
Interest coverage (operating income ÷ interest)
9.5 timesfiscal 2025
Debt due within 12 months
$100K0.01 times cash and investments

From the figures the company filed with the SEC. Cash flow over net income near or above 1 means earnings are collected in cash; far below, that part is accounting. Coverage says how many times operating income pays the latest fiscal year's interest. Maturities come from the debt note of the latest annual report, counted from its closing date. “No data” never means zero.

Insiders (Form 4)

Officers and directors who bought (6 m)
1
Amount (6 m)
$1.0M
CEO/CFO bought (12 m)
No

10% owners who bought (6 m): 1 · $4.7M

Open-market purchases, excluding 10b5-1 plans. Officers and directors only; joint filers of the same purchase count as one. 10% owners with no role are shown separately. 0 = nobody bought; “no data” = we do not have its Form 4 filings.

Each of the company's Form 4 filings, on EDGAR ↗Latest trades, with date and filing →

Above 5% (13D/13G)

Disclosed stakes, with their amendments. A filing is not always a purchase: there are also reductions and changes of filing entity.

This list may be incomplete: we hold 13D and 13G filings made since Dec 23, 2024. A holder above 5% that has not filed anything since then is not shown here.

Above 5% over time (13D/13G)

Each holder with its filings in order. History since December 2024.

Flagged material events (8-K)

  • May 1, 2026Seriousfiling ↗

    Notice of delisting or failure to meet a listing rule (Item 3.01)

  • Jun 26, 2026Routinefiling ↗

    Change in directors or officers (Item 5.02)

  • Jun 12, 2026Routinefiling ↗

    Change in directors or officers (Item 5.02)

  • Feb 23, 2026Routinefiling ↗

    Unregistered sale of equity securities (Item 3.02)

    «Atara Biotherapeutics Provides a Business Update»

Alert items the company itself flagged in its 8-K filings with the SEC, most serious first. It is the form's label, with no interpretation from us: Item 5.02 covers routine appointments as well as a chief executive's departure; open the filing. The quoted headline is the original press release's.

All material events (8-K)

Earnings, agreements, financing, management changes and announcements from the last year, with a filter by type and a link to each filing.

Other Health Care stocks in managers' portfolios

Same sector and a similar number of concentrated managers holding them. It is a list to keep exploring, not a recommendation.

All of Health Care →

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