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Definium Therapeutics, Inc.

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Definium Therapeutics, Inc.

CIK 0001813814DFTX· quarter ending 2026-06-30
Shares outstanding
134,366,950
as of 2026-07-30 · 10-Q cover page, filed 2026-08-06
Held by 13F filers
1
selection includes debt or preferreds — no % of shares outstanding
Holders
1
+0 vs 2026-03-31 · 0 new, 0 exited
Value
$1
shares +0.0% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-06, as of 2026-07-30)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common stockDFTX · NASDAQ134,366,950114,822,29985.5%36124477V105

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
24477V105COM SHS361114,822,299134,366,95085.5%$5.4B15 call / 12 put13DGholders →
60255C109COMMON STOCK-FOnot common11——$1—prefixholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (1 of 1 · 60255C109)

change vs 2026-03-31
#FilerShares / principal% of classValueChange
1HUNTINGTON NATIONAL BANK1—$1—

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Commodore Capital LPSCHEDULE 13G/A2026-08-142026-06-302,410,0001.8%
Commodore Capital Master LPSCHEDULE 13G/A2026-08-142026-06-302,410,0001.8%
DRIEHAUS CAPITAL MANAGEMENT LLCSCHEDULE 13G/A2026-08-142026-06-306,845,2765.36%
Michael KramarzSCHEDULE 13G/A2026-08-142026-06-302,410,0001.8%
Robert Egen AtkinsonSCHEDULE 13G/A2026-08-142026-06-302,410,0001.8%
David KroinSCHEDULE 13G/A2026-05-152026-03-313,000,0003.01%
Deep Track Biotechnology Master Fund, Ltd.SCHEDULE 13G/A2026-05-152026-03-313,000,0003.01%
Deep Track Capital, LPSCHEDULE 13G/A2026-05-152026-03-313,000,0003.01%
Avoro Capital Advisors LLCSCHEDULE 13G2026-02-172025-12-315,000,0005.08%
Behzad AghazadehSCHEDULE 13G2026-02-172025-12-315,000,0005.08%
BlackRock, Inc.SCHEDULE 13G/A2025-02-052024-12-316,070,0538.3%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.