There is a long list of 155 institutional holders of IBRX 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 IBRX by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-IBRX table below, the initial column indicates the name of each top institutional holder of IBRX, with a link to that fund's top holdings. The next columns indicate the amount of IBRX stock held by each of the institutional holders of IBRX, followed by the IBRX 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
Vanguard Group Inc.	13,539,590	$72,708	03/31/2024
IBRX	13,539,590	$72,708	03/31/2024
BlackRock Inc.	10,375,311	$55,715	03/31/2024
IBRX	10,375,311	$55,715	03/31/2024
State Street Corp	9,470,909	$47,544	12/31/2023
IBRX	9,470,909	$47,544	12/31/2023
Geode Capital Management LLC	3,379,464	$16,967	12/31/2023
IBRX	3,379,464	$16,967	12/31/2023
Jane Street Group LLC		$8,387	12/31/2023
Call	865,000	$4,342	12/31/2023
IBRX	821,643	$4,125	12/31/2023
Put	15,900	$80	12/31/2023
Credit Suisse AG	1,548,826	$8,317	03/31/2024
IBRX	1,548,826	$8,317	03/31/2024
JPMorgan Chase & Co.		$8,001	03/31/2024
IBRX	1,435,746	$7,710	03/31/2024
Call	54,200	$291	03/31/2024
Rafferty Asset Management LLC	1,310,390	$7,037	03/31/2024
IBRX	1,310,390	$7,037	03/31/2024
Northern Trust Corp	1,357,059	$6,812	12/31/2023
IBRX	1,357,059	$6,812	12/31/2023
Group One Trading L.P.		$6,662	03/31/2024
Call	1,581,800	$8,494	03/31/2024
Put	341,100	$1,832	03/31/2024
Goldman Sachs Group Inc.		$6,361	12/31/2023
IBRX	1,278,638	$6,419	12/31/2023
Put	11,500	$58	12/31/2023
Charles Schwab Investment Management Inc.	1,171,212	$6,289	03/31/2024
IBRX	1,171,212	$6,289	03/31/2024
Citigroup Inc.	1,128,446	$6,060	03/31/2024
IBRX	1,128,446	$6,060	03/31/2024
Sheets Smith Wealth Management	945,720	$5,079	03/31/2024
IBRX	945,720	$5,079	03/31/2024
UBS Group AG	925,489	$4,970	03/31/2024
IBRX	925,489	$4,970	03/31/2024
Bank of America Corp DE	891,815	$4,477	12/31/2023
IBRX	891,815	$4,477	12/31/2023
Susquehanna International Group LLP		$3,856	03/31/2024
Call	1,117,600	$6,002	03/31/2024
Put	510,900	$2,744	03/31/2024
IBRX	111,388	$598	03/31/2024
Allen Holding Inc. NY	687,571	$3,692	03/31/2024
IBRX	687,571	$3,692	03/31/2024
Invesco Ltd.	641,363	$3,220	12/31/2023
IBRX	641,363	$3,220	12/31/2023
Morgan Stanley	599,718	$3,011	12/31/2023
IBRX	599,718	$3,011	12/31/2023
D. E. Shaw & Co. Inc.	591,101	$2,967	12/31/2023
IBRX	591,101	$2,967	12/31/2023
Nuveen Asset Management LLC	506,425	$2,720	03/31/2024
IBRX	506,425	$2,720	03/31/2024
Putnam Investments LLC	534,201	$2,682	12/31/2023
IBRX	534,201	$2,682	12/31/2023
Bank of New York Mellon Corp	450,794	$2,421	03/31/2024
IBRX	450,794	$2,421	03/31/2024
Barclays PLC	479,545	$2,406	12/31/2023
IBRX	479,545	$2,406	12/31/2023
Clearwater Capital Advisors LLC	443,299	$2,381	03/31/2024
IBRX	443,299	$2,381	03/31/2024
HarbourVest Partners LLC	335,709	$1,685	12/31/2023
IBRX	335,709	$1,685	12/31/2023
Blair William & Co. IL	313,542	$1,684	03/31/2024
IBRX	313,542	$1,684	03/31/2024
Skandinaviska Enskilda Banken AB publ	270,950	$1,455	03/31/2024
IBRX	270,950	$1,455	03/31/2024
Alliancebernstein L.P.	284,930	$1,430	12/31/2023
IBRX	284,930	$1,430	12/31/2023
Swiss National Bank	263,100	$1,413	03/31/2024
IBRX	263,100	$1,413	03/31/2024
CI Private Wealth LLC	221,530	$1,190	03/31/2024
IBRX	221,530	$1,190	03/31/2024
DekaBank Deutsche Girozentrale	205,092	$1,119	03/31/2024
IBRX	205,092	$1,119	03/31/2024
Profund Advisors LLC	201,343	$1,081	03/31/2024
IBRX	201,343	$1,081	03/31/2024
Rhumbline Advisers	186,875	$1,004	03/31/2024
IBRX	186,875	$1,004	03/31/2024
UBS Asset Management Americas Inc.	182,930	$918	12/31/2023
IBRX	182,930	$918	12/31/2023
Deutsche Bank AG	149,725	$752	12/31/2023
IBRX	149,725	$752	12/31/2023
California State Teachers Retirement System	140,690	$706	12/31/2023
IBRX	140,690	$706	12/31/2023
China Universal Asset Management Co. Ltd.	128,321	$689	03/31/2024
IBRX	128,321	$689	03/31/2024
Legal & General Group Plc	120,529	$605	12/31/2023
IBRX	120,529	$605	12/31/2023
Price T Rowe Associates Inc. MD	119,346	$601	12/31/2023
IBRX	119,346	$601	12/31/2023
Meridian Investment Counsel Inc.	96,433	$518	03/31/2024
IBRX	96,433	$518	03/31/2024
State of Wisconsin Investment Board	93,735	$471	12/31/2023
IBRX	93,735	$471	12/31/2023
Royal Bank of Canada	85,528	$429	12/31/2023
IBRX	85,528	$429	12/31/2023
Sculptor Capital LP	79,500	$399	12/31/2023
IBRX	79,500	$399	12/31/2023
Principal Financial Group Inc.	73,466	$395	03/31/2024
IBRX	73,466	$395	03/31/2024
ProShare Advisors LLC	70,613	$379	03/31/2024
IBRX	70,613	$379	03/31/2024
Rathbone Brothers plc	73,420	$369	12/31/2023
IBRX	73,420	$369	12/31/2023
MetLife Investment Management LLC	70,824	$356	12/31/2023
IBRX	70,824	$356	12/31/2023
Wealth Effects LLC	65,500	$352	03/31/2024
IBRX	65,500	$352	03/31/2024