There is a long list of 343 institutional holders of OPCH 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 OPCH by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-OPCH table below, the initial column indicates the name of each top institutional holder of OPCH, with a link to that fund's top holdings. The next columns indicate the amount of OPCH stock held by each of the institutional holders of OPCH, followed by the OPCH 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
BlackRock Inc.	21,132,926	$711,968	12/31/2023
OPCH	21,132,926	$711,968	12/31/2023
Vanguard Group Inc.	19,626,205	$661,207	12/31/2023
OPCH	19,626,205	$661,207	12/31/2023
Wellington Management Group LLP	7,445,556	$250,841	12/31/2023
OPCH	7,445,556	$250,841	12/31/2023
State Street Corp	5,932,295	$199,859	12/31/2023
OPCH	5,932,295	$199,859	12/31/2023
UBS Asset Management Americas Inc.	5,223,531	$175,981	12/31/2023
OPCH	5,223,531	$175,981	12/31/2023
Westfield Capital Management Co. LP	4,482,732	$151,023	12/31/2023
OPCH	4,482,732	$151,023	12/31/2023
Marshall Wace LLP	3,880,397	$130,731	12/31/2023
OPCH	3,880,397	$130,731	12/31/2023
Geode Capital Management LLC	3,845,285	$129,563	12/31/2023
OPCH	3,845,285	$129,563	12/31/2023
Dimensional Fund Advisors LP	3,191,672	$107,530	12/31/2023
OPCH	3,191,672	$107,530	12/31/2023
Nuveen Asset Management LLC	2,959,940	$99,720	12/31/2023
OPCH	2,959,940	$99,720	12/31/2023
Morgan Stanley	2,914,711	$98,197	12/31/2023
OPCH	2,914,711	$98,197	12/31/2023
FMR LLC	2,897,484	$97,616	12/31/2023
OPCH	2,897,484	$97,616	12/31/2023
Park West Asset Management LLC	2,870,637	$96,712	12/31/2023
OPCH	2,870,637	$96,712	12/31/2023
Citadel Advisors LLC		$93,490	12/31/2023
OPCH	2,669,196	$89,925	12/31/2023
Call	110,800	$3,733	12/31/2023
Put	5,000	$168	12/31/2023
Loomis Sayles & Co. L P	2,695,495	$90,811	12/31/2023
OPCH	2,695,495	$90,811	12/31/2023
Thrivent Financial for Lutherans	2,551,860	$85,972	12/31/2023
OPCH	2,551,860	$85,972	12/31/2023
Northern Trust Corp	2,480,161	$83,557	12/31/2023
OPCH	2,480,161	$83,557	12/31/2023
Bank of America Corp DE	2,425,591	$81,718	12/31/2023
OPCH	2,425,591	$81,718	12/31/2023
Millennium Management LLC		$80,219	12/31/2023
OPCH	2,361,087	$79,545	12/31/2023
Call	20,000	$674	12/31/2023
Charles Schwab Investment Management Inc.	2,366,594	$79,731	12/31/2023
OPCH	2,366,594	$79,731	12/31/2023
Holocene Advisors LP	2,320,199	$78,168	12/31/2023
OPCH	2,320,199	$78,168	12/31/2023
Fuller & Thaler Asset Management Inc.	2,265,979	$76,341	12/31/2023
OPCH	2,265,979	$76,341	12/31/2023
Southpoint Capital Advisors LP	2,000,000	$67,380	12/31/2023
OPCH	2,000,000	$67,380	12/31/2023
Riverbridge Partners LLC	1,957,825	$65,959	12/31/2023
OPCH	1,957,825	$65,959	12/31/2023
Bellevue Group AG	1,938,807	$65,318	12/31/2023
OPCH	1,938,807	$65,318	12/31/2023
Norges Bank	1,909,858	$64,343	12/31/2023
OPCH	1,909,858	$64,343	12/31/2023
Point72 Asset Management L.P.		$62,063	12/31/2023
OPCH	1,864,477	$62,814	12/31/2023
Put	46,900	$1,580	12/31/2023
Call	24,600	$829	12/31/2023
Putnam Investments LLC	1,802,380	$60,722	12/31/2023
OPCH	1,802,380	$60,722	12/31/2023
Price T Rowe Associates Inc. MD	1,736,806	$58,514	12/31/2023
OPCH	1,736,806	$58,514	12/31/2023
Bank of New York Mellon Corp	1,588,675	$53,284	03/31/2024
OPCH	1,588,675	$53,284	03/31/2024
Duquesne Family Office LLC	1,456,215	$49,060	12/31/2023
OPCH	1,456,215	$49,060	12/31/2023
Schroder Investment Management Group	1,417,591	$47,759	12/31/2023
OPCH	1,417,591	$47,759	12/31/2023
The Manufacturers Life Insurance Company	1,386,537	$46,712	12/31/2023
OPCH	1,386,537	$46,712	12/31/2023
Allspring Global Investments Holdings LLC	1,337,913	$44,874	03/31/2024
OPCH	1,337,913	$44,874	03/31/2024
Gilder Gagnon Howe & Co. LLC	1,281,299	$43,167	12/31/2023
OPCH	1,281,299	$43,167	12/31/2023
Castle Hook Partners LP	1,177,133	$39,658	12/31/2023
OPCH	1,177,133	$39,658	12/31/2023
Macquarie Group Ltd.	1,151,355	$38,789	12/31/2023
OPCH	1,151,355	$38,789	12/31/2023
Villere ST Denis J & Co. LLC	1,138,297	$38,178	03/31/2024
OPCH	1,138,297	$38,178	03/31/2024
American Century Companies Inc.	999,669	$33,679	12/31/2023
OPCH	999,669	$33,679	12/31/2023
Magnetar Financial LLC	988,238	$33,294	12/31/2023
OPCH	988,238	$33,294	12/31/2023
Principal Financial Group Inc.	968,233	$32,620	12/31/2023
OPCH	968,233	$32,620	12/31/2023
Hood River Capital Management LLC	918,253	$30,936	12/31/2023
OPCH	918,253	$30,936	12/31/2023
Ranger Investment Management L.P.	888,495	$29,933	12/31/2023
OPCH	888,495	$29,933	12/31/2023
Alyeska Investment Group L.P.	885,384	$29,829	12/31/2023
OPCH	885,384	$29,829	12/31/2023
JPMorgan Chase & Co.	879,476	$29,630	12/31/2023
OPCH	879,476	$29,630	12/31/2023
Deutsche Bank AG	862,193	$29,047	12/31/2023
OPCH	862,193	$29,047	12/31/2023
Assenagon Asset Management S.A.	828,970	$27,804	03/31/2024
OPCH	828,970	$27,804	03/31/2024
Comerica Bank	714,276	$24,064	12/31/2023
OPCH	714,276	$24,064	12/31/2023
D. E. Shaw & Co. Inc.	707,444	$23,834	12/31/2023
OPCH	707,444	$23,834	12/31/2023
Fiera Capital Corp	646,831	$21,792	12/31/2023
OPCH	646,831	$21,792	12/31/2023