There is a long list of 51 institutional holders of GRPH 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 GRPH by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-GRPH table below, the initial column indicates the name of each top institutional holder of GRPH, with a link to that fund's top holdings. The next columns indicate the amount of GRPH stock held by each of the institutional holders of GRPH, followed by the GRPH 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
EcoR1 Capital LLC	8,538,446	$22,371	12/31/2023
GRPH	8,538,446	$22,371	12/31/2023
Samsara BioCapital LLC	8,459,314	$22,163	12/31/2023
GRPH	8,459,314	$22,163	12/31/2023
Tang Capital Management LLC	2,491,780	$6,528	12/31/2023
GRPH	2,491,780	$6,528	12/31/2023
BlackRock Inc.	1,760,019	$4,611	12/31/2023
GRPH	1,760,019	$4,611	12/31/2023
Vanguard Group Inc.	1,425,980	$3,736	12/31/2023
GRPH	1,425,980	$3,736	12/31/2023
Prosight Management LP	1,351,939	$3,542	12/31/2023
GRPH	1,351,939	$3,542	12/31/2023
Nantahala Capital Management LLC	820,971	$2,151	12/31/2023
GRPH	820,971	$2,151	12/31/2023
Board of Trustees of The Leland Stanford Junior University	703,071	$1,842	12/31/2023
GRPH	703,071	$1,842	12/31/2023
Citadel Advisors LLC		$1,533	12/31/2023
GRPH	586,724	$1,537	12/31/2023
Put	1,700	$4	12/31/2023
Renaissance Technologies LLC	581,156	$1,523	12/31/2023
GRPH	581,156	$1,523	12/31/2023
Geode Capital Management LLC	555,153	$1,455	12/31/2023
GRPH	555,153	$1,455	12/31/2023
Sectoral Asset Management Inc	441,829	$1,158	12/31/2023
GRPH	441,829	$1,158	12/31/2023
State Street Corp	434,467	$1,138	12/31/2023
GRPH	434,467	$1,138	12/31/2023
Northern Trust Corp	279,194	$731	12/31/2023
GRPH	279,194	$731	12/31/2023
Morgan Stanley	204,778	$537	12/31/2023
GRPH	204,778	$537	12/31/2023
Acuitas Investments LLC	194,578	$510	12/31/2023
GRPH	194,578	$510	12/31/2023
Jacobs Levy Equity Management Inc.	186,048	$487	12/31/2023
GRPH	186,048	$487	12/31/2023
Bridgeway Capital Management Inc.	172,750	$453	12/31/2023
GRPH	172,750	$453	12/31/2023
Two Sigma Advisers LP	135,300	$354	12/31/2023
GRPH	135,300	$354	12/31/2023
Two Sigma Investments LP	131,068	$343	12/31/2023
GRPH	131,068	$343	12/31/2023
Dimensional Fund Advisors LP	115,490	$303	12/31/2023
GRPH	115,490	$303	12/31/2023
Millennium Management LLC	90,568	$237	12/31/2023
GRPH	90,568	$237	12/31/2023
Barclays PLC	82,451	$216	12/31/2023
GRPH	82,451	$216	12/31/2023
Charles Schwab Investment Management Inc.	81,785	$214	12/31/2023
GRPH	81,785	$214	12/31/2023
Cornercap Investment Counsel Inc.	65,535	$172	12/31/2023
GRPH	65,535	$172	12/31/2023
Bank of America Corp DE	62,753	$164	12/31/2023
GRPH	62,753	$164	12/31/2023
Nuveen Asset Management LLC	39,738	$104	12/31/2023
GRPH	39,738	$104	12/31/2023
BBR Partners LLC	36,722	$96	12/31/2023
GRPH	36,722	$96	12/31/2023
Virtu Financial LLC	34,893	$91	12/31/2023
GRPH	34,893	$91	12/31/2023
Jane Street Group LLC	32,191	$84	12/31/2023
GRPH	32,191	$84	12/31/2023
Rhumbline Advisers	31,202	$82	12/31/2023
GRPH	31,202	$82	12/31/2023
UBS Group AG	30,712	$80	12/31/2023
GRPH	30,712	$80	12/31/2023
Goldman Sachs Group Inc.	28,538	$75	12/31/2023
GRPH	28,538	$75	12/31/2023
Prelude Capital Management LLC	28,584	$75	12/31/2023
GRPH	28,584	$75	12/31/2023
Hsbc Holdings PLC	21,871	$58	12/31/2023
GRPH	21,871	$58	12/31/2023
XTX Topco Ltd	19,475	$51	12/31/2023
GRPH	19,475	$51	12/31/2023
JPMorgan Chase & Co.	18,164	$48	12/31/2023
GRPH	18,164	$48	12/31/2023
American International Group Inc.	13,929	$36	12/31/2023
GRPH	13,929	$36	12/31/2023
Invesco Ltd.	13,419	$35	12/31/2023
GRPH	13,419	$35	12/31/2023
Squarepoint Ops LLC	12,368	$32	12/31/2023
GRPH	12,368	$32	12/31/2023
Maven Securities LTD	10,000	$26	12/31/2023
GRPH	10,000	$26	12/31/2023
Wells Fargo & Company MN	9,133	$24	12/31/2023
GRPH	9,133	$24	12/31/2023
Royal Bank of Canada	7,673	$20	12/31/2023
GRPH	7,673	$20	12/31/2023
California State Teachers Retirement System	4,613	$12	12/31/2023
GRPH	4,613	$12	12/31/2023
Tower Research Capital LLC TRC	4,521	$12	12/31/2023
GRPH	4,521	$12	12/31/2023
Citigroup Inc.	4,058	$11	12/31/2023
GRPH	4,058	$11	12/31/2023
Legal & General Group Plc	2,677	$7	12/31/2023
GRPH	2,677	$7	12/31/2023
Lazard Asset Management LLC	2,873	$7	12/31/2023
GRPH	2,873	$7	12/31/2023
Ameritas Investment Partners Inc.	2,314	$6	12/31/2023
GRPH	2,314	$6	12/31/2023
Advisor Group Holdings Inc.	1,340	$4	12/31/2023
GRPH	1,340	$4	12/31/2023