There is a long list of 67 institutional holders of JANX within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of JANX by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-JANX table below, the initial column indicates the name of each top institutional holder of JANX, with a link to that fund's top holdings. The next columns indicate the amount of JANX stock held by each of the institutional holders of JANX, followed by the JANX position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
RA Capital Management L.P.	9,165,652	$98,347	12/31/2023
JANX	9,165,652	$98,347	12/31/2023
FMR LLC	4,671,213	$50,122	12/31/2023
JANX	4,671,213	$50,122	12/31/2023
BVF Inc. IL	4,579,818	$49,141	12/31/2023
JANX	4,579,818	$49,141	12/31/2023
Orbimed Advisors LLC	3,317,927	$35,601	12/31/2023
JANX	3,317,927	$35,601	12/31/2023
Citadel Advisors LLC		$33,532	12/31/2023
JANX	3,120,205	$33,480	12/31/2023
Call	5,600	$60	12/31/2023
Put	700	$8	12/31/2023
Janus Henderson Group PLC	1,931,477	$20,744	12/31/2023
JANX	1,931,477	$20,744	12/31/2023
BlackRock Inc.	1,762,101	$18,907	12/31/2023
JANX	1,762,101	$18,907	12/31/2023
Adage Capital Partners GP L.L.C.	1,355,475	$14,544	12/31/2023
JANX	1,355,475	$14,544	12/31/2023
Vanguard Group Inc.	979,483	$10,510	12/31/2023
JANX	979,483	$10,510	12/31/2023
Geode Capital Management LLC	408,190	$4,380	12/31/2023
JANX	408,190	$4,380	12/31/2023
Samsara BioCapital LLC	360,414	$3,867	12/31/2023
JANX	360,414	$3,867	12/31/2023
State Street Corp	347,585	$3,730	12/31/2023
JANX	347,585	$3,730	12/31/2023
Northern Trust Corp	204,002	$2,189	12/31/2023
JANX	204,002	$2,189	12/31/2023
Alyeska Investment Group L.P.	197,490	$2,119	12/31/2023
JANX	197,490	$2,119	12/31/2023
Nuveen Asset Management LLC	81,574	$875	12/31/2023
JANX	81,574	$875	12/31/2023
Millennium Management LLC	71,856	$771	12/31/2023
JANX	71,856	$771	12/31/2023
Morgan Stanley	67,448	$724	12/31/2023
JANX	67,448	$724	12/31/2023
Squarepoint Ops LLC	61,168	$656	12/31/2023
JANX	61,168	$656	12/31/2023
Cerity Partners LLC	60,933	$654	12/31/2023
JANX	60,933	$654	12/31/2023
Zacks Investment Management	58,804	$631	12/31/2023
JANX	58,804	$631	12/31/2023
DekaBank Deutsche Girozentrale	49,500	$579	12/31/2023
JANX	49,500	$579	12/31/2023
Bank of New York Mellon Corp	52,746	$566	12/31/2023
JANX	52,746	$566	12/31/2023
Janney Montgomery Scott LLC	51,548	$553	12/31/2023
JANX	51,548	$553	12/31/2023
Barclays PLC	47,722	$511	12/31/2023
JANX	47,722	$511	12/31/2023
Charles Schwab Investment Management Inc.	46,141	$495	12/31/2023
JANX	46,141	$495	12/31/2023
Two Sigma Investments LP	44,108	$473	12/31/2023
JANX	44,108	$473	12/31/2023
Bank of America Corp DE	43,801	$470	12/31/2023
JANX	43,801	$470	12/31/2023
Goldman Sachs Group Inc.	39,948	$429	12/31/2023
JANX	39,948	$429	12/31/2023
Swiss National Bank	31,800	$341	12/31/2023
JANX	31,800	$341	12/31/2023
Exchange Traded Concepts LLC	7,544	$284	03/31/2024
JANX	7,544	$284	03/31/2024
Rhumbline Advisers	26,085	$280	12/31/2023
JANX	26,085	$280	12/31/2023
Two Sigma Advisers LP	23,600	$253	12/31/2023
JANX	23,600	$253	12/31/2023
Allspring Global Investments Holdings LLC	6,349	$239	03/31/2024
JANX	6,349	$239	03/31/2024
Credit Suisse AG	18,310	$196	12/31/2023
JANX	18,310	$196	12/31/2023
JPMorgan Chase & Co.	17,736	$190	12/31/2023
JANX	17,736	$190	12/31/2023
Alliancebernstein L.P.	17,370	$186	12/31/2023
JANX	17,370	$186	12/31/2023
California State Teachers Retirement System	17,192	$184	12/31/2023
JANX	17,192	$184	12/31/2023
State of Wisconsin Investment Board	15,121	$162	12/31/2023
JANX	15,121	$162	12/31/2023
Connor Clark & Lunn Investment Management Ltd.	12,816	$138	12/31/2023
JANX	12,816	$138	12/31/2023
American Century Companies Inc.	11,443	$123	12/31/2023
JANX	11,443	$123	12/31/2023
MetLife Investment Management LLC	10,614	$114	12/31/2023
JANX	10,614	$114	12/31/2023
Old Well Partners LLC	10,300	$111	12/31/2023
JANX	10,300	$111	12/31/2023
Legal & General Group Plc	9,881	$106	12/31/2023
JANX	9,881	$106	12/31/2023
SG Americas Securities LLC	9,345	$100	12/31/2023
JANX	9,345	$100	12/31/2023
American International Group Inc.	8,596	$92	12/31/2023
JANX	8,596	$92	12/31/2023
Deutsche Bank AG	6,973	$75	12/31/2023
JANX	6,973	$75	12/31/2023
Wells Fargo & Company MN	5,288	$57	12/31/2023
JANX	5,288	$57	12/31/2023
China Universal Asset Management Co. Ltd.	5,343	$57	12/31/2023
JANX	5,343	$57	12/31/2023
New York State Common Retirement Fund	5,050	$54	12/31/2023
JANX	5,050	$54	12/31/2023
Royal Bank of Canada	4,697	$51	12/31/2023
JANX	4,697	$51	12/31/2023