There is a long list of 226 institutional holders of IOSP 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 IOSP by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-IOSP table below, the initial column indicates the name of each top institutional holder of IOSP, with a link to that fund's top holdings. The next columns indicate the amount of IOSP stock held by each of the institutional holders of IOSP, followed by the IOSP 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.	3,974,345	$489,798	12/31/2023
IOSP	3,974,345	$489,798	12/31/2023
Vanguard Group Inc.	2,953,918	$364,041	12/31/2023
IOSP	2,953,918	$364,041	12/31/2023
Allspring Global Investments Holdings LLC	2,318,589	$298,959	03/31/2024
IOSP	2,318,589	$298,959	03/31/2024
Wasatch Advisors Inc.	1,972,110	$254,284	03/31/2024
IOSP	1,972,110	$254,284	03/31/2024
Dimensional Fund Advisors LP	1,215,525	$149,803	12/31/2023
IOSP	1,215,525	$149,803	12/31/2023
Victory Capital Management Inc.	1,023,632	$126,152	12/31/2023
IOSP	1,023,632	$126,152	12/31/2023
State Street Corp	959,907	$118,299	12/31/2023
IOSP	959,907	$118,299	12/31/2023
Royce & Associates LP	824,125	$101,565	12/31/2023
IOSP	824,125	$101,565	12/31/2023
Champlain Investment Partners LLC	779,565	$96,074	12/31/2023
IOSP	779,565	$96,074	12/31/2023
Geode Capital Management LLC	591,737	$72,934	12/31/2023
IOSP	591,737	$72,934	12/31/2023
Janus Henderson Group PLC	581,053	$71,610	12/31/2023
IOSP	581,053	$71,610	12/31/2023
Nuveen Asset Management LLC	464,532	$57,249	12/31/2023
IOSP	464,532	$57,249	12/31/2023
Northern Trust Corp	401,422	$49,471	12/31/2023
IOSP	401,422	$49,471	12/31/2023
Charles Schwab Investment Management Inc.	307,490	$37,895	12/31/2023
IOSP	307,490	$37,895	12/31/2023
Invesco Ltd.	287,050	$35,376	12/31/2023
IOSP	287,050	$35,376	12/31/2023
Westwood Holdings Group Inc.	272,000	$33,521	12/31/2023
IOSP	272,000	$33,521	12/31/2023
Bank of New York Mellon Corp	252,146	$32,512	03/31/2024
IOSP	252,146	$32,512	03/31/2024
Goldman Sachs Group Inc.	248,344	$30,606	12/31/2023
IOSP	248,344	$30,606	12/31/2023
Morgan Stanley	219,406	$27,040	12/31/2023
IOSP	219,406	$27,040	12/31/2023
Norges Bank	210,359	$25,925	12/31/2023
IOSP	210,359	$25,925	12/31/2023
Eagle Asset Management Inc.	198,344	$24,444	12/31/2023
IOSP	198,344	$24,444	12/31/2023
Bank of America Corp DE	183,684	$22,637	12/31/2023
IOSP	183,684	$22,637	12/31/2023
Voya Investment Management LLC	149,287	$18,398	12/31/2023
IOSP	149,287	$18,398	12/31/2023
Telemark Asset Management LLC	147,000	$18,116	12/31/2023
IOSP	147,000	$18,116	12/31/2023
Principal Financial Group Inc.	135,189	$16,661	12/31/2023
IOSP	135,189	$16,661	12/31/2023
Sei Investments Co.	132,256	$16,299	12/31/2023
IOSP	132,256	$16,299	12/31/2023
JPMorgan Chase & Co.	129,900	$16,009	12/31/2023
IOSP	129,900	$16,009	12/31/2023
Bessemer Group Inc.	118,146	$14,561	12/31/2023
IOSP	118,146	$14,561	12/31/2023
Acadian Asset Management LLC	99,425	$12,239	12/31/2023
IOSP	99,425	$12,239	12/31/2023
Raymond James & Associates	84,196	$10,856	03/31/2024
IOSP	84,196	$10,856	03/31/2024
Ameriprise Financial Inc.	87,138	$10,739	12/31/2023
IOSP	87,138	$10,739	12/31/2023
Segall Bryant & Hamill LLC	87,043	$10,727	12/31/2023
IOSP	87,043	$10,727	12/31/2023
Kirr Marbach & Co. LLC IN	78,336	$10,101	03/31/2024
IOSP	78,336	$10,101	03/31/2024
Hotchkis & Wiley Capital Management LLC	79,800	$9,835	12/31/2023
IOSP	79,800	$9,835	12/31/2023
Osterweis Capital Management Inc.	79,610	$9,811	12/31/2023
IOSP	79,610	$9,811	12/31/2023
Algert Global LLC	76,327	$9,407	12/31/2023
IOSP	76,327	$9,407	12/31/2023
Rhumbline Advisers	75,386	$9,291	12/31/2023
IOSP	75,386	$9,291	12/31/2023
Legal & General Group Plc	70,721	$8,716	12/31/2023
IOSP	70,721	$8,716	12/31/2023
Leeward Investments LLC MA	66,548	$8,581	03/31/2024
IOSP	66,548	$8,581	03/31/2024
Thrivent Financial for Lutherans	65,208	$8,036	12/31/2023
IOSP	65,208	$8,036	12/31/2023
Assenagon Asset Management S.A.	60,528	$7,804	03/31/2024
IOSP	60,528	$7,804	03/31/2024
Millennium Management LLC	60,170	$7,415	12/31/2023
IOSP	60,170	$7,415	12/31/2023
Wells Fargo & Company MN	60,061	$7,402	12/31/2023
IOSP	60,061	$7,402	12/31/2023
UBS Group AG	57,410	$7,075	12/31/2023
IOSP	57,410	$7,075	12/31/2023
Huber Capital Management LLC	56,786	$6,998	12/31/2023
IOSP	56,786	$6,998	12/31/2023
Credit Suisse AG	56,667	$6,984	12/31/2023
IOSP	56,667	$6,984	12/31/2023
Public Sector Pension Investment Board	51,602	$6,359	12/31/2023
IOSP	51,602	$6,359	12/31/2023
Panagora Asset Management Inc.	49,113	$6,053	12/31/2023
IOSP	49,113	$6,053	12/31/2023
Swiss National Bank	49,003	$6,039	12/31/2023
IOSP	49,003	$6,039	12/31/2023
Moran Wealth Management LLC	46,869	$5,776	12/31/2023
IOSP	46,869	$5,776	12/31/2023