Definium Therapeutics Ownership | Who Owns Definium Therapeutics?

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Definium Therapeutics Ownership Summary

Definium Therapeutics is owned by 106.41% institutional investors, 1.73% insiders. Blackrock funding, inc. /de is the largest institutional shareholder, holding 10.33% of DFTX shares. American Funds SMALLCAP World A is the top mutual fund, with 5.79% of its assets in Definium Therapeutics shares.

DFTX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Definium Therapeutics	106.41%	1.73%	-8.13%
Sector	Healthcare Stocks	245.07%	12.10%	-157.17%
Industry	Biotech Stocks	380.48%	11.73%	-292.21%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	11.23M	10.33%	$528.39M
Avoro capital advisors	7.19M	6.61%	$338.17M
Driehaus capital management	6.85M	6.29%	$322.00M
Capital world investors	5.37M	4.93%	$252.50M
Fmr	4.75M	4.37%	$223.58M
Price t rowe associates inc /md/	4.65M	4.28%	$218.83M
Geode capital management	3.64M	3.35%	$171.48M
State street	3.07M	2.82%	$144.20M
Capital investors	2.96M	2.72%	$139.40M
Octagon capital advisors lp	2.95M	2.71%	$138.77M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Octagon capital advisors lp	2.95M	12.47%	$138.77M
Data collective iv gp	100.35K	6.01%	$4.72M
Commodore capital lp	2.00M	5.60%	$94.08M
Superstring capital management lp	188.28K	5.59%	$8.86M
Catalio capital management, lp	562.67K	4.97%	$26.47M
Great point partners	425.00K	3.78%	$19.99M
Boxer capital management	998.50K	3.54%	$46.97M
Awm investment company	784.80K	3.20%	$36.92M
Avoro capital advisors	7.19M	3.04%	$338.17M
Highvista strategies	242.88K	2.60%	$11.43M

Top Buyers

Holder	Shares	% Assets	Change
Capital world investors	5.37M	0.03%	5.37M
Price t rowe associates inc /md/	4.65M	0.02%	4.58M
Capital investors	2.96M	0.03%	2.96M
Fmr	4.75M	0.01%	2.94M
Blackrock funding, inc. /de	11.23M	0.01%	2.75M

Top Sellers

Holder	Shares	% Assets	Change
Arrowmark colorado	564.07K	1.10%	-1.03M
Candriam s.c.a.	614.42K	0.13%	-679.20K
Millennium management	266.08K	0.00%	-580.82K
Catalio capital management, lp	562.67K	4.97%	-475.31K
Orbimed advisors	365.40K	0.32%	-438.60K

New Positions

Holder	Shares	% Assets	Change	Value
Capital world investors	5.37M	0.03%	5.37M	$252.50M
Capital investors	2.96M	0.03%	2.96M	$139.40M
Ra capital management	1.50M	0.61%	1.50M	$70.56M
Sixth street partners management company	1.08M	0.01%	1.08M	$50.97M
Polar capital	777.25K	0.09%	777.25K	$36.56M

Sold Out

Holder	Change
Corecap advisors	-5.00
Rmg wealth management	-30.00
Western wealth management	-39.00
Louisbourg investments	-52.00
Kohmann bosshard financial services	-66.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	384	47.69%	115,759,808	48.34%	106	2.07%	268	9.39%	66	1550.00%
Mar 31, 2026	253	3062.50%	73,974,924	557.41%	82	52.19%	238	2875.00%	4	-
Dec 31, 2025	8	-	11,252,538	-	12	-	8	-	-	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
American Funds SMALLCAP World A	7.69M	5.79%	7.69M
iShares Russell 2000 ETF	3.31M	2.49%	-58.85K
Vanguard Institutional Extnd Mkt Idx Tr	1.49M	1.11%	7.68K
iShares Russell 2000 Growth ETF	1.19M	0.89%	-10.86K
T. Rowe Price New Horizons	1.14M	0.86%	1.02M
US Small-Cap Growth II Equity Comp	1.14M	0.86%	1.14M
Fidelity Small Cap Index	979.65K	0.74%	5.62K
Candriam Eqs L Biotech C USD Cap	971.22K	0.72%	-
iShares Biotechnology ETF	932.15K	0.70%	160.76K
Janus Henderson Hrzn Biotec E2 USD	873.29K	0.66%	83.13K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 25, 2026	Karlin Daniel	Chief Medical Officer	Sell	$396.89K
Sep 25, 2026	Barrow Robert	Chief Executive Officer	Sell	$1.15M
Sep 25, 2026	Wiley Matthew T.	Chief Commercial Officer	Sell	$113.26K
Sep 25, 2026	Sullivan Mark	Chief Legal Officer	Sell	$513.85K
Sep 25, 2026	Roberts Brandi	Chief Financial Officer	Sell	$123.50K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	1
2026 Q2	-	5
2026 Q1	-	3

DFTX Ownership FAQ

Who Owns Definium Therapeutics?

Definium Therapeutics shareholders are primarily institutional investors at 106.41%, followed by 1.73% insiders and -8.14% retail investors. The average institutional ownership in Definium Therapeutics's industry, Biotech Stocks , is 380.48%, which Definium Therapeutics falls below.

Who owns the most shares of Definium Therapeutics?

Definium Therapeutics’s largest shareholders are Blackrock funding, inc. /de (11.23M shares, 10.33%), Avoro capital advisors (7.19M shares, 6.61%), and Driehaus capital management (6.85M shares, 6.29%). Together, they hold 23.23% 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 12.47% of its assets in 2.95M Definium Therapeutics shares, valued at 138.77M$.

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

American Funds SMALLCAP World A is the top mutual fund holder of Definium Therapeutics shares, with 5.79% of its total shares outstanding invested in 7.69M Definium Therapeutics shares.

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