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Definium Therapeutics Ownership | Who Owns Definium Therapeutics?

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Definium Therapeutics Ownership Summary

Definium Therapeutics is owned by 82.81% institutional investors, 0.95% insiders, and 16.24% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 9.49% of DFTX shares. iShares Russell 2000 ETF is the top mutual fund, with 2.17% of its assets in Definium Therapeutics shares.

DFTX Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockDefinium Therapeutics82.81%0.95%16.24%
SectorHealthcare Stocks 35.75%11.89%52.37%
IndustryBiotech Stocks 36.05%11.82%52.13%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Blackrock funding, inc. /de8.48M9.49%$160.28M
Driehaus capital management5.91M6.62%$111.73M
Avoro capital advisors5.00M5.60%$94.50M
Deep track capital, lp3.00M3.36%$56.70M
Geode capital management2.50M2.79%$47.17M
State street2.47M2.77%$46.72M
Octagon capital advisors lp2.44M2.73%$46.12M
Commodore capital lp2.00M2.24%$37.80M
Fmr1.81M2.03%$34.20M
Goldman sachs group1.68M1.88%$31.67M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Octagon capital advisors lp2.44M5.10%$46.12M
Superstring capital management lp351.46K4.75%$6.64M
Catalio capital management, lp1.04M4.10%$19.62M
Data collective iv gp100.35K3.39%$1.90M
Awm investment company1.08M2.25%$20.35M
Commodore capital lp2.00M2.19%$37.80M
Boxer capital management598.50K1.49%$11.31M
Soviero asset management, lp140.00K1.32%$2.65M
Stempoint capital lp325.48K1.20%$6.15M
Patient square capital lp331.00K1.11%$6.26M

Top Buyers

HolderShares% AssetsChange
Blackrock funding, inc. /de8.48M0.00%8.48M
Avoro capital advisors5.00M0.93%5.00M
Deep track capital, lp3.00M0.93%3.00M
Geode capital management2.50M0.00%2.50M
State street2.47M0.00%2.47M

Top Sellers

HolderShares% AssetsChange
Marshall wace, llp1.20M0.02%-1.77M
Driehaus capital management5.91M0.82%-625.31K
Awm investment company1.08M2.25%-313.77K
Dark forest capital management lp---30.66K
Sound income strategies3.69K0.00%-

New Positions

HolderShares% AssetsChangeValue
Blackrock funding, inc. /de8.48M0.00%8.48M$160.28M
Avoro capital advisors5.00M0.93%5.00M$94.50M
Deep track capital, lp3.00M0.93%3.00M$56.70M
Geode capital management2.50M0.00%2.50M$47.17M
State street2.47M0.00%2.47M$46.72M

Sold Out

HolderChange
Dark forest capital management lp-30.66K

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Mar 31, 20262533062.50%73,974,924557.41%8252.19%2382875.00%4-
Dec 31, 20258-11,252,538-12-8---

Top Mutual Funds Shareholders

HolderShares% HoldingChange
iShares Russell 2000 ETF2.37M2.17%21.84K
Vanguard Institutional Extnd Mkt Idx Tr1.11M1.02%12.17K
Fidelity Small Cap Index966.08K0.89%43.71K
Fidelity Small Cap Growth817.40K0.75%-
Heptagon Driehaus US Micro Cap Eq C$ Acc791.70K0.73%15.34K
iShares Biotechnology ETF700.52K0.64%13.41K
Janus Henderson Hrzn Biotec E2 USD694.53K0.64%252.31K
Eventide Healthcare & Life Sciences I686.16K0.63%686.16K
Russell 2000 Equity Index Fund B591.36K0.54%101.90K
State St Russell Sm/Mid Cp® Indx SL Cl I590.31K0.54%4.30K

Recent Insider Transactions

DateNameRoleActivityValue
Jun 25, 2026Sullivan Mark Chief Legal OfficerSell$585.75K
Jun 25, 2026Roberts Brandi Chief Financial OfficerSell$135.68K
Jun 25, 2026Barrow Robert Chief Executive OfficerSell$1.32M
Jun 25, 2026Karlin Daniel Chief Medical OfficerSell$451.88K
Jun 25, 2026Wiley Matthew T. Chief Commercial OfficerSell$129.10K

Insider Transactions Trends

DateBuySell
2026 Q2-5
2026 Q1-3

DFTX Ownership FAQ

Who Owns Definium Therapeutics?

Definium Therapeutics shareholders are primarily institutional investors at 82.81%, followed by 0.95% insiders and 16.24% retail investors. The average institutional ownership in Definium Therapeutics's industry, Biotech Stocks , is 36.05%, which Definium Therapeutics exceeds.

Who owns the most shares of Definium Therapeutics?

Definium Therapeutics’s largest shareholders are Blackrock funding, inc. /de (8.48M shares, 9.49%), Driehaus capital management (5.91M shares, 6.62%), and Avoro capital advisors (5M shares, 5.60%). Together, they hold 21.71% of Definium Therapeutics’s total shares outstanding.

Does Blackrock own Definium Therapeutics?

BlackRock is not among the top 10 institutional shareholders of Definium Therapeutics.

Who is Definium Therapeutics’s biggest shareholder by percentage of total assets invested?

Octagon capital advisors lp is Definium Therapeutics’s biggest shareholder by percentage of total assets invested, with 5.10% of its assets in 2.44M Definium Therapeutics shares, valued at 46.12M$.

Who is the top mutual fund holder of Definium Therapeutics shares?

iShares Russell 2000 ETF is the top mutual fund holder of Definium Therapeutics shares, with 2.17% of its total shares outstanding invested in 2.37M Definium Therapeutics shares.

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