There is a long list of 199 institutional holders of PDFS 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 PDFS by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-PDFS table below, the initial column indicates the name of each top institutional holder of PDFS, with a link to that fund's top holdings. The next columns indicate the amount of PDFS stock held by each of the institutional holders of PDFS, followed by the PDFS 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.	4,840,071	$155,560	12/31/2023
PDFS	4,840,071	$155,560	12/31/2023
Vanguard Group Inc.	3,089,669	$99,302	12/31/2023
PDFS	3,089,669	$99,302	12/31/2023
Wasatch Advisors Inc.	1,328,265	$44,723	03/31/2024
PDFS	1,328,265	$44,723	03/31/2024
State Street Corp	1,113,606	$35,791	12/31/2023
PDFS	1,113,606	$35,791	12/31/2023
Samjo Management LLC	1,073,484	$34,502	12/31/2023
PDFS	1,073,484	$34,502	12/31/2023
Snyder Capital Management L P	896,892	$31,265	12/31/2023
PDFS	896,892	$31,265	12/31/2023
Dimensional Fund Advisors LP	930,280	$29,900	12/31/2023
PDFS	930,280	$29,900	12/31/2023
Morgan Stanley	926,563	$29,780	12/31/2023
PDFS	926,563	$29,780	12/31/2023
Needham Investment Management LLC	862,500	$27,721	12/31/2023
PDFS	862,500	$27,721	12/31/2023
Ranger Investment Management L.P.	769,650	$24,737	12/31/2023
PDFS	769,650	$24,737	12/31/2023
Emerald Advisers LLC	754,856	$24,261	12/31/2023
PDFS	754,856	$24,261	12/31/2023
Geode Capital Management LLC	674,873	$21,693	12/31/2023
PDFS	674,873	$21,693	12/31/2023
William Blair Investment Management LLC	647,937	$20,825	12/31/2023
PDFS	647,937	$20,825	12/31/2023
Emerald Mutual Fund Advisers Trust	616,031	$19,799	12/31/2023
PDFS	616,031	$19,799	12/31/2023
Divisar Capital Management LLC	537,440	$17,273	12/31/2023
PDFS	537,440	$17,273	12/31/2023
Nuveen Asset Management LLC	494,449	$15,892	12/31/2023
PDFS	494,449	$15,892	12/31/2023
Janus Henderson Group PLC	465,266	$14,954	12/31/2023
PDFS	465,266	$14,954	12/31/2023
Northern Trust Corp	396,074	$12,730	12/31/2023
PDFS	396,074	$12,730	12/31/2023
Silverberg Bernstein Capital Management LLC	302,610	$10,189	03/31/2024
PDFS	302,610	$10,189	03/31/2024
Thrivent Financial for Lutherans	297,221	$9,553	12/31/2023
PDFS	297,221	$9,553	12/31/2023
Charles Schwab Investment Management Inc.	247,961	$7,969	12/31/2023
PDFS	247,961	$7,969	12/31/2023
Bank of New York Mellon Corp	236,011	$7,946	03/31/2024
PDFS	236,011	$7,946	03/31/2024
Russell Investments Group Ltd.	245,012	$7,875	12/31/2023
PDFS	245,012	$7,875	12/31/2023
Silvercrest Asset Management Group LLC	241,211	$7,753	12/31/2023
PDFS	241,211	$7,753	12/31/2023
Assenagon Asset Management S.A.	211,030	$7,105	03/31/2024
PDFS	211,030	$7,105	03/31/2024
Royce & Associates LP	208,400	$6,698	12/31/2023
PDFS	208,400	$6,698	12/31/2023
Goldman Sachs Group Inc.	197,974	$6,363	12/31/2023
PDFS	197,974	$6,363	12/31/2023
Invesco Ltd.	169,312	$5,442	12/31/2023
PDFS	169,312	$5,442	12/31/2023
Principal Financial Group Inc.	159,575	$5,373	03/31/2024
PDFS	159,575	$5,373	03/31/2024
Two Sigma Advisers LP	155,600	$5,001	12/31/2023
PDFS	155,600	$5,001	12/31/2023
Qube Research & Technologies Ltd	142,337	$4,575	12/31/2023
PDFS	142,337	$4,575	12/31/2023
Granahan Investment Management Inc. MA	136,167	$4,376	12/31/2023
PDFS	136,167	$4,376	12/31/2023
Millennium Management LLC	134,786	$4,332	12/31/2023
PDFS	134,786	$4,332	12/31/2023
Two Sigma Investments LP	132,658	$4,264	12/31/2023
PDFS	132,658	$4,264	12/31/2023
Segall Bryant & Hamill LLC	123,030	$3,954	12/31/2023
PDFS	123,030	$3,954	12/31/2023
Connor Clark & Lunn Investment Management Ltd.	119,415	$3,838	12/31/2023
PDFS	119,415	$3,838	12/31/2023
Jacobs Levy Equity Management Inc.	111,615	$3,587	12/31/2023
PDFS	111,615	$3,587	12/31/2023
Mutual of America Capital Management LLC	111,561	$3,586	12/31/2023
PDFS	111,561	$3,586	12/31/2023
AMI Asset Management Corp	104,495	$3,518	03/31/2024
PDFS	104,495	$3,518	03/31/2024
FMR LLC	109,303	$3,513	12/31/2023
PDFS	109,303	$3,513	12/31/2023
Ameriprise Financial Inc.	107,997	$3,471	12/31/2023
PDFS	107,997	$3,471	12/31/2023
Citadel Advisors LLC		$3,361	12/31/2023
PDFS	105,754	$3,399	12/31/2023
Put	1,500	$48	12/31/2023
Call	300	$10	12/31/2023
Acadian Asset Management LLC	101,802	$3,267	12/31/2023
PDFS	101,802	$3,267	12/31/2023
D. E. Shaw & Co. Inc.	91,035	$2,926	12/31/2023
PDFS	91,035	$2,926	12/31/2023
Legal & General Group Plc	87,269	$2,805	12/31/2023
PDFS	87,269	$2,805	12/31/2023
Rhumbline Advisers	86,157	$2,769	12/31/2023
PDFS	86,157	$2,769	12/31/2023
Panagora Asset Management Inc.	82,823	$2,662	12/31/2023
PDFS	82,823	$2,662	12/31/2023
AQR Capital Management LLC	73,239	$2,354	12/31/2023
PDFS	73,239	$2,354	12/31/2023
Renaissance Technologies LLC	71,577	$2,300	12/31/2023
PDFS	71,577	$2,300	12/31/2023
Cubist Systematic Strategies LLC	71,113	$2,286	12/31/2023
PDFS	71,113	$2,286	12/31/2023