There is a long list of 63 institutional holders of PROK 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 PROK by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-PROK table below, the initial column indicates the name of each top institutional holder of PROK, with a link to that fund's top holdings. The next columns indicate the amount of PROK stock held by each of the institutional holders of PROK, followed by the PROK 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
Morgan Stanley	11,197,199	$19,931	12/31/2023
PROK	11,197,199	$19,931	12/31/2023
Suvretta Capital Management LLC	3,867,847	$6,885	12/31/2023
PROK	3,867,847	$6,885	12/31/2023
Vanguard Group Inc.	2,899,044	$5,160	12/31/2023
PROK	2,899,044	$5,160	12/31/2023
BlackRock Inc.	2,871,249	$5,111	12/31/2023
PROK	2,871,249	$5,111	12/31/2023
Bleichroeder LP	2,000,000	$3,560	12/31/2023
PROK	2,000,000	$3,560	12/31/2023
Brown University	1,000,000	$1,780	12/31/2023
PROK	1,000,000	$1,780	12/31/2023
State Street Corp	981,391	$1,747	12/31/2023
PROK	981,391	$1,747	12/31/2023
Geode Capital Management LLC	898,673	$1,600	12/31/2023
PROK	898,673	$1,600	12/31/2023
Bank of America Corp DE	654,670	$1,165	12/31/2023
PROK	654,670	$1,165	12/31/2023
Millennium Management LLC	638,114	$1,136	12/31/2023
PROK	638,114	$1,136	12/31/2023
Northern Trust Corp	379,218	$675	12/31/2023
PROK	379,218	$675	12/31/2023
Charles Schwab Investment Management Inc.	255,103	$454	12/31/2023
PROK	255,103	$454	12/31/2023
Squarepoint Ops LLC	207,682	$370	12/31/2023
PROK	207,682	$370	12/31/2023
Nuveen Asset Management LLC	135,830	$242	12/31/2023
PROK	135,830	$242	12/31/2023
Renaissance Technologies LLC	120,000	$214	12/31/2023
PROK	120,000	$214	12/31/2023
Bank of New York Mellon Corp	123,970	$203	03/31/2024
PROK	123,970	$203	03/31/2024
Federated Hermes Inc.	113,286	$202	12/31/2023
PROK	113,286	$202	12/31/2023
XTX Topco Ltd	73,032	$130	12/31/2023
PROK	73,032	$130	12/31/2023
Amundi	71,843	$128	12/31/2023
PROK	71,843	$128	12/31/2023
Rhumbline Advisers	69,208	$123	12/31/2023
PROK	69,208	$123	12/31/2023
Jane Street Group LLC	62,828	$112	12/31/2023
PROK	62,828	$112	12/31/2023
Barclays PLC	61,815	$110	12/31/2023
PROK	61,815	$110	12/31/2023
Alliancebernstein L.P.	48,040	$86	12/31/2023
PROK	48,040	$86	12/31/2023
UBS Group AG	48,319	$86	12/31/2023
PROK	48,319	$86	12/31/2023
SG Americas Securities LLC	46,829	$83	12/31/2023
PROK	46,829	$83	12/31/2023
Engineers Gate Manager LP	39,831	$71	12/31/2023
PROK	39,831	$71	12/31/2023
Goldman Sachs Group Inc.	37,633	$67	12/31/2023
PROK	37,633	$67	12/31/2023
Susquehanna International Group LLP	32,196	$57	12/31/2023
PROK	32,196	$57	12/31/2023
Point72 Middle East FZE	31,855	$57	12/31/2023
PROK	31,855	$57	12/31/2023
JPMorgan Chase & Co.	30,064	$54	12/31/2023
PROK	30,064	$54	12/31/2023
Invesco Ltd.	28,936	$52	12/31/2023
PROK	28,936	$52	12/31/2023
Cubist Systematic Strategies LLC	27,395	$49	12/31/2023
PROK	27,395	$49	12/31/2023
Marshall Wace LLP	23,300	$41	12/31/2023
PROK	23,300	$41	12/31/2023
American International Group Inc.	22,367	$40	12/31/2023
PROK	22,367	$40	12/31/2023
Walleye Capital LLC	21,678	$39	12/31/2023
PROK	21,678	$39	12/31/2023
Jump Financial LLC	21,677	$39	12/31/2023
PROK	21,677	$39	12/31/2023
Voya Investment Management LLC	18,924	$34	12/31/2023
PROK	18,924	$34	12/31/2023
Zullo Investment Group Inc.	19,420	$32	03/31/2024
PROK	19,420	$32	03/31/2024
State Board of Administration of Florida Retirement System	17,820	$32	12/31/2023
PROK	17,820	$32	12/31/2023
New York State Common Retirement Fund	17,195	$31	12/31/2023
PROK	17,195	$31	12/31/2023
Mariner LLC	17,659	$31	12/31/2023
PROK	17,659	$31	12/31/2023
Letko Brosseau & Associates Inc.	15,900	$28	12/31/2023
PROK	15,900	$28	12/31/2023
Royal Bank of Canada	15,530	$27	12/31/2023
PROK	15,530	$27	12/31/2023
Wells Fargo & Company MN	13,181	$23	12/31/2023
PROK	13,181	$23	12/31/2023
Wexford Capital LP	12,580	$22	12/31/2023
PROK	12,580	$22	12/31/2023
Tower Research Capital LLC TRC	12,245	$22	12/31/2023
PROK	12,245	$22	12/31/2023
Citadel Advisors LLC		$20	12/31/2023
PROK	14,616	$26	12/31/2023
Put	4,000	$7	12/31/2023
Call	700	$1	12/31/2023
Alpine Global Management LLC	11,186	$20	12/31/2023
PROK	11,186	$20	12/31/2023
Price T Rowe Associates Inc. MD	10,485	$19	12/31/2023
PROK	10,485	$19	12/31/2023
Strs Ohio	9,500	$16	12/31/2023
PROK	9,500	$16	12/31/2023