There is a long list of 119 institutional holders of KROS 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 KROS by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-KROS table below, the initial column indicates the name of each top institutional holder of KROS, with a link to that fund's top holdings. The next columns indicate the amount of KROS stock held by each of the institutional holders of KROS, followed by the KROS 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
FMR LLC	3,874,204	$154,038	12/31/2023
KROS	3,874,204	$154,038	12/31/2023
BlackRock Inc.	2,036,788	$80,983	12/31/2023
KROS	2,036,788	$80,983	12/31/2023
Alkeon Capital Management LLC	1,498,907	$59,597	12/31/2023
KROS	1,498,907	$59,597	12/31/2023
Vanguard Group Inc.	1,432,195	$56,944	12/31/2023
KROS	1,432,195	$56,944	12/31/2023
Orbimed Advisors LLC	1,268,734	$50,445	12/31/2023
KROS	1,268,734	$50,445	12/31/2023
Braidwell LP	1,118,961	$44,490	12/31/2023
KROS	1,118,961	$44,490	12/31/2023
Darwin Global Management Ltd.	1,060,427	$42,163	12/31/2023
KROS	1,060,427	$42,163	12/31/2023
State Street Corp	1,054,367	$41,922	12/31/2023
KROS	1,054,367	$41,922	12/31/2023
Price T Rowe Associates Inc. MD	1,041,701	$41,419	12/31/2023
KROS	1,041,701	$41,419	12/31/2023
Morgan Stanley	925,388	$36,793	12/31/2023
KROS	925,388	$36,793	12/31/2023
Candriam Luxembourg S.C.A.	819,062	$32,567	12/31/2023
KROS	819,062	$32,567	12/31/2023
Citadel Advisors LLC		$30,201	12/31/2023
KROS	760,168	$30,224	12/31/2023
Put	2,100	$83	12/31/2023
Call	1,500	$60	12/31/2023
Franklin Resources Inc.	699,425	$27,809	12/31/2023
KROS	699,425	$27,809	12/31/2023
ADAR1 Capital Management LLC	688,316	$27,367	12/31/2023
KROS	688,316	$27,367	12/31/2023
Woodline Partners LP	583,792	$23,212	12/31/2023
KROS	583,792	$23,212	12/31/2023
Eventide Asset Management LLC	580,000	$23,061	12/31/2023
KROS	580,000	$23,061	12/31/2023
Millennium Management LLC	522,128	$20,760	12/31/2023
KROS	522,128	$20,760	12/31/2023
Geode Capital Management LLC	510,211	$20,288	12/31/2023
KROS	510,211	$20,288	12/31/2023
Parkman Healthcare Partners LLC	360,467	$14,332	12/31/2023
KROS	360,467	$14,332	12/31/2023
Deutsche Bank AG	358,276	$14,245	12/31/2023
KROS	358,276	$14,245	12/31/2023
Opaleye Management Inc.	357,500	$14,214	12/31/2023
KROS	357,500	$14,214	12/31/2023
Blue Owl Capital Holdings LP	352,633	$14,021	12/31/2023
KROS	352,633	$14,021	12/31/2023
Nantahala Capital Management LLC		$12,784	12/31/2023
KROS	310,141	$12,331	12/31/2023
Call	11,400	$453	12/31/2023
Barclays PLC	259,760	$10,327	12/31/2023
KROS	259,760	$10,327	12/31/2023
Northern Trust Corp	216,846	$8,622	12/31/2023
KROS	216,846	$8,622	12/31/2023
American Century Companies Inc.	214,597	$8,532	12/31/2023
KROS	214,597	$8,532	12/31/2023
Goldman Sachs Group Inc.	205,099	$8,155	12/31/2023
KROS	205,099	$8,155	12/31/2023
WCM Investment Management LLC	117,030	$7,747	03/31/2024
KROS	117,030	$7,747	03/31/2024
Bank of America Corp DE	193,449	$7,692	12/31/2023
KROS	193,449	$7,692	12/31/2023
Charles Schwab Investment Management Inc.	181,578	$7,220	12/31/2023
KROS	181,578	$7,220	12/31/2023
UBS Group AG	181,385	$7,212	12/31/2023
KROS	181,385	$7,212	12/31/2023
Dimensional Fund Advisors LP	170,852	$6,794	12/31/2023
KROS	170,852	$6,794	12/31/2023
Citigroup Inc.	169,391	$6,735	12/31/2023
KROS	169,391	$6,735	12/31/2023
Bank of New York Mellon Corp	99,633	$6,596	03/31/2024
KROS	99,633	$6,596	03/31/2024
Schonfeld Strategic Advisors LLC	95,338	$3,791	12/31/2023
KROS	95,338	$3,791	12/31/2023
Russell Investments Group Ltd.	94,557	$3,760	12/31/2023
KROS	94,557	$3,760	12/31/2023
Point72 Asset Management L.P.	81,230	$3,230	12/31/2023
KROS	81,230	$3,230	12/31/2023
Nuveen Asset Management LLC	75,596	$3,006	12/31/2023
KROS	75,596	$3,006	12/31/2023
Superstring Capital Management LP	74,649	$2,968	12/31/2023
KROS	74,649	$2,968	12/31/2023
DAFNA Capital Management LLC	74,361	$2,957	12/31/2023
KROS	74,361	$2,957	12/31/2023
Rafferty Asset Management LLC	65,281	$2,596	12/31/2023
KROS	65,281	$2,596	12/31/2023
JPMorgan Chase & Co.	62,644	$2,491	12/31/2023
KROS	62,644	$2,491	12/31/2023
Marshall Wace LLP	49,472	$1,967	12/31/2023
KROS	49,472	$1,967	12/31/2023
Platinum Investment Management Ltd.	48,883	$1,944	12/31/2023
KROS	48,883	$1,944	12/31/2023
Swiss National Bank	40,900	$1,626	12/31/2023
KROS	40,900	$1,626	12/31/2023
Jane Street Group LLC		$1,607	12/31/2023
Call	21,000	$835	12/31/2023
KROS	19,417	$772	12/31/2023
Norges Bank	35,700	$1,419	12/31/2023
KROS	35,700	$1,419	12/31/2023
Qube Research & Technologies Ltd	34,542	$1,373	12/31/2023
KROS	34,542	$1,373	12/31/2023
Voya Investment Management LLC	33,635	$1,337	12/31/2023
KROS	33,635	$1,337	12/31/2023
Rhumbline Advisers	31,657	$1,259	12/31/2023
KROS	31,657	$1,259	12/31/2023