On this page, we present all of the funds holding PDFS from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding PDFS, with a link to that fund's top holdings. The next columns indicate the amount of PDFS stock held by each of the funds holding PDFS, followed by the PDFS position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 198 funds holding PDFS within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by BlackRock Inc.. For more details on the positions held by BlackRock Inc. (or by any of the other funds holding PDFS), click the fund name in the "Holder" column of the funds-holding-PDFS table below.

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.	1,287,236	$41,372	12/31/2023
PDFS	1,287,236	$41,372	12/31/2023
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
Assenagon Asset Management S.A.	517,479	$16,632	12/31/2023
PDFS	517,479	$16,632	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	245,342	$7,885	12/31/2023
PDFS	245,342	$7,885	12/31/2023
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
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.	166,270	$5,344	12/31/2023
PDFS	166,270	$5,344	12/31/2023
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
FMR LLC	109,303	$3,513	12/31/2023
PDFS	109,303	$3,513	12/31/2023
AMI Asset Management Corp	108,998	$3,503	12/31/2023
PDFS	108,998	$3,503	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
Oberweis Asset Management Inc.	69,500	$2,234	12/31/2023
PDFS	69,500	$2,234	12/31/2023
Allspring Global Investments Holdings LLC	67,198	$2,160	12/31/2023
PDFS	67,198	$2,160	12/31/2023
Trexquant Investment LP	66,817	$2,147	12/31/2023
PDFS	66,817	$2,147	12/31/2023
JPMorgan Chase & Co.	66,239	$2,129	12/31/2023
PDFS	66,239	$2,129	12/31/2023
Next Century Growth Investors LLC	64,906	$2,086	12/31/2023
PDFS	64,906	$2,086	12/31/2023
Public Sector Pension Investment Board	63,525	$2,042	12/31/2023
PDFS	63,525	$2,042	12/31/2023
Swiss National Bank	60,100	$1,932	12/31/2023
PDFS	60,100	$1,932	12/31/2023
Voloridge Investment Management LLC	59,494	$1,912	12/31/2023
PDFS	59,494	$1,912	12/31/2023
Nishkama Capital LLC	57,714	$1,855	12/31/2023
PDFS	57,714	$1,855	12/31/2023
Algert Global LLC	55,579	$1,786	12/31/2023
PDFS	55,579	$1,786	12/31/2023
Fisher Asset Management LLC	54,810	$1,762	12/31/2023
PDFS	54,810	$1,762	12/31/2023
BNP Paribas Arbitrage SA	54,742	$1,759	12/31/2023
PDFS	54,742	$1,759	12/31/2023
Deutsche Bank AG	54,042	$1,737	12/31/2023
PDFS	54,042	$1,737	12/31/2023
Credit Suisse AG	50,689	$1,629	12/31/2023
PDFS	50,689	$1,629	12/31/2023
Dana Investment Advisors Inc.	50,543	$1,624	12/31/2023
PDFS	50,543	$1,624	12/31/2023
Westerly Capital Management LLC	50,000	$1,607	12/31/2023
PDFS	50,000	$1,607	12/31/2023
Barclays PLC	48,149	$1,547	12/31/2023
PDFS	48,149	$1,547	12/31/2023
Engineers Gate Manager LP	47,468	$1,526	12/31/2023
PDFS	47,468	$1,526	12/31/2023
Roubaix Capital LLC	46,306	$1,488	12/31/2023
PDFS	46,306	$1,488	12/31/2023
M&T Bank Corp	44,807	$1,440	12/31/2023
PDFS	44,807	$1,440	12/31/2023
Arrowstreet Capital Limited Partnership	40,407	$1,299	12/31/2023
PDFS	40,407	$1,299	12/31/2023
Victory Capital Management Inc.	40,106	$1,289	12/31/2023
PDFS	40,106	$1,289	12/31/2023
State of Tennessee Treasury Department	35,871	$1,153	12/31/2023
PDFS	35,871	$1,153	12/31/2023
Prudential Financial Inc.	35,482	$1,140	12/31/2023
PDFS	35,482	$1,140	12/31/2023
Allianz Asset Management GmbH	35,300	$1,135	12/31/2023
PDFS	35,300	$1,135	12/31/2023
Alliancebernstein L.P.	34,349	$1,104	12/31/2023
PDFS	34,349	$1,104	12/31/2023
Bank of America Corp DE	34,120	$1,097	12/31/2023
PDFS	34,120	$1,097	12/31/2023
UBS Asset Management Americas Inc.	34,064	$1,095	12/31/2023
PDFS	34,064	$1,095	12/31/2023
Envestnet Asset Management Inc.	33,858	$1,088	12/31/2023
PDFS	33,858	$1,088	12/31/2023
Great West Life Assurance Co. Can	33,259	$1,066	12/31/2023
PDFS	33,259	$1,066	12/31/2023
California State Teachers Retirement System	32,707	$1,051	12/31/2023
PDFS	32,707	$1,051	12/31/2023
UBS Group AG	32,685	$1,050	12/31/2023
PDFS	32,685	$1,050	12/31/2023
Williams Jones Wealth Management LLC.	32,000	$1,028	12/31/2023
PDFS	32,000	$1,028	12/31/2023
Raymond James & Associates	29,667	$953	12/31/2023
PDFS	29,667	$953	12/31/2023
Aquila Investment Management LLC	29,000	$932	12/31/2023
PDFS	29,000	$932	12/31/2023
Moloney Securities Asset Management LLC	28,761	$924	12/31/2023
PDFS	28,761	$924	12/31/2023
Voya Investment Management LLC	26,823	$862	12/31/2023
PDFS	26,823	$862	12/31/2023
Man Group plc	26,515	$852	12/31/2023
PDFS	26,515	$852	12/31/2023
Texas Permanent School Fund	26,441	$850	12/31/2023
PDFS	26,441	$850	12/31/2023
Captrust Financial Advisors	25,133	$808	12/31/2023
PDFS	25,133	$808	12/31/2023
Jackson Creek Investment Advisors LLC	24,859	$799	12/31/2023
PDFS	24,859	$799	12/31/2023
Squarepoint Ops LLC	24,265	$780	12/31/2023
PDFS	24,265	$780	12/31/2023
Occudo Quantitative Strategies LP	22,731	$731	12/31/2023
PDFS	22,731	$731	12/31/2023
Sei Investments Co.	22,413	$720	12/31/2023
PDFS	22,413	$720	12/31/2023
State of Wisconsin Investment Board	22,393	$720	12/31/2023
PDFS	22,393	$720	12/31/2023
American Century Companies Inc.	21,951	$706	12/31/2023
PDFS	21,951	$706	12/31/2023
Citigroup Inc.	21,071	$677	12/31/2023
PDFS	21,071	$677	12/31/2023
Woodline Partners LP	20,300	$652	12/31/2023
PDFS	20,300	$652	12/31/2023
Balyasny Asset Management LLC	20,201	$649	12/31/2023
PDFS	20,201	$649	12/31/2023
State of Alaska Department of Revenue	18,831	$605	12/31/2023
PDFS	18,831	$605	12/31/2023
Skandinaviska Enskilda Banken AB publ	18,700	$601	12/31/2023
PDFS	18,700	$601	12/31/2023
HRT Financial LP	18,488	$594	12/31/2023
PDFS	18,488	$594	12/31/2023
Walleye Capital LLC	18,002	$579	12/31/2023
PDFS	18,002	$579	12/31/2023
Strs Ohio	17,800	$572	12/31/2023
PDFS	17,800	$572	12/31/2023
Illinois Municipal Retirement Fund	17,701	$569	12/31/2023
PDFS	17,701	$569	12/31/2023
Pitcairn Co.	17,072	$549	12/31/2023
PDFS	17,072	$549	12/31/2023
American International Group Inc.	16,669	$536	12/31/2023
PDFS	16,669	$536	12/31/2023
Campbell & CO Investment Adviser LLC	16,503	$530	12/31/2023
PDFS	16,503	$530	12/31/2023
MetLife Investment Management LLC	16,194	$520	12/31/2023
PDFS	16,194	$520	12/31/2023
Royal Bank of Canada	16,097	$518	12/31/2023
PDFS	16,097	$518	12/31/2023
Yousif Capital Management LLC	16,114	$518	12/31/2023
PDFS	16,114	$518	12/31/2023
The Manufacturers Life Insurance Company	15,405	$495	12/31/2023
PDFS	15,405	$495	12/31/2023
Louisiana State Employees Retirement System	15,300	$492	12/31/2023
PDFS	15,300	$492	12/31/2023
Mirae Asset Global Investments Co. Ltd.	14,355	$461	12/31/2023
PDFS	14,355	$461	12/31/2023
Comerica Bank	14,105	$453	12/31/2023
PDFS	14,105	$453	12/31/2023
Zacks Investment Management	14,091	$453	12/31/2023
PDFS	14,091	$453	12/31/2023
Amalgamated Bank	13,184	$424	12/31/2023
PDFS	13,184	$424	12/31/2023
Quadrature Capital Ltd	12,300	$395	12/31/2023
PDFS	12,300	$395	12/31/2023
Globeflex Capital L P	12,233	$393	12/31/2023
PDFS	12,233	$393	12/31/2023
Nebula Research & Development LLC	12,227	$393	12/31/2023
PDFS	12,227	$393	12/31/2023
New York State Common Retirement Fund	12,200	$392	12/31/2023
PDFS	12,200	$392	12/31/2023
CWM Advisors LLC	11,926	$383	12/31/2023
PDFS	11,926	$383	12/31/2023
Susquehanna International Group LLP	11,278	$362	12/31/2023
PDFS	11,278	$362	12/31/2023
Maryland State Retirement & Pension System	11,235	$361	12/31/2023
PDFS	11,235	$361	12/31/2023
Landscape Capital Management L.L.C.	11,099	$357	12/31/2023
PDFS	11,099	$357	12/31/2023
Putnam Investments LLC	11,019	$354	12/31/2023
PDFS	11,019	$354	12/31/2023
Lazard Asset Management LLC	10,573	$339	12/31/2023
PDFS	10,573	$339	12/31/2023
Wealth Enhancement Advisory Services LLC	9,793	$330	03/31/2024
PDFS	9,793	$330	03/31/2024
Wells Fargo & Company MN	10,104	$325	12/31/2023
PDFS	10,104	$325	12/31/2023
First Trust Advisors LP	9,822	$316	12/31/2023
PDFS	9,822	$316	12/31/2023
Diversified Trust Co	9,688	$311	12/31/2023
PDFS	9,688	$311	12/31/2023
Mesirow Financial Investment Management Inc.	10,152	$308	12/31/2023
PDFS	10,152	$308	12/31/2023
Teachers Retirement System of The State of Kentucky	9,557	$307	12/31/2023
PDFS	9,557	$307	12/31/2023
Ardsley Advisory Partners LP	9,500	$305	12/31/2023
PDFS	9,500	$305	12/31/2023
Atom Investors LP	9,315	$299	12/31/2023
PDFS	9,315	$299	12/31/2023
Everence Capital Management Inc.	9,190	$295	12/31/2023
PDFS	9,190	$295	12/31/2023
State Board of Administration of Florida Retirement System	8,987	$289	12/31/2023
PDFS	8,987	$289	12/31/2023
Oregon Public Employees Retirement Fund	8,987	$289	12/31/2023
PDFS	8,987	$289	12/31/2023
Tower Research Capital LLC TRC	8,682	$279	12/31/2023
PDFS	8,682	$279	12/31/2023
Arizona State Retirement System	8,527	$274	12/31/2023
PDFS	8,527	$274	12/31/2023
Aquatic Capital Management LLC	8,500	$273	12/31/2023
PDFS	8,500	$273	12/31/2023
Centiva Capital LP	8,335	$268	12/31/2023
PDFS	8,335	$268	12/31/2023
Evoke Wealth LLC	8,316	$267	12/31/2023
PDFS	8,316	$267	12/31/2023
New York Life Investment Management LLC	8,209	$264	12/31/2023
PDFS	8,209	$264	12/31/2023
New York State Teachers Retirement System	8,156	$262	12/31/2023
PDFS	8,156	$262	12/31/2023
Quantbot Technologies LP	7,939	$255	12/31/2023
PDFS	7,939	$255	12/31/2023
MQS Management LLC	7,797	$251	12/31/2023
PDFS	7,797	$251	12/31/2023
The PNC Financial Services Group Inc.	7,692	$247	12/31/2023
PDFS	7,692	$247	12/31/2023
Price T Rowe Associates Inc. MD	7,467	$240	12/31/2023
PDFS	7,467	$240	12/31/2023
Sherbrooke Park Advisers LLC	7,224	$232	12/31/2023
PDFS	7,224	$232	12/31/2023
Pathstone Holdings LLC	7,203	$232	12/31/2023
PDFS	7,203	$232	12/31/2023
EntryPoint Capital LLC	6,827	$219	12/31/2023
PDFS	6,827	$219	12/31/2023
Commonwealth of Pennsylvania Public School Empls Retrmt SYS	6,605	$212	12/31/2023
PDFS	6,605	$212	12/31/2023
Jump Financial LLC	6,237	$200	12/31/2023
PDFS	6,237	$200	12/31/2023
DekaBank Deutsche Girozentrale	5,821	$189	12/31/2023
PDFS	5,821	$189	12/31/2023
Zurcher Kantonalbank Zurich Cantonalbank	5,014	$161	12/31/2023
PDFS	5,014	$161	12/31/2023
Advisor Group Holdings Inc.	4,471	$144	12/31/2023
PDFS	4,471	$144	12/31/2023
US Bancorp DE	3,612	$116	12/31/2023
PDFS	3,612	$116	12/31/2023
Ameritas Investment Partners Inc.	3,045	$98	12/31/2023
PDFS	3,045	$98	12/31/2023
Kayne Anderson Rudnick Investment Management LLC	2,600	$84	12/31/2023
PDFS	2,600	$84	12/31/2023
Quest Partners LLC	2,246	$72	12/31/2023
PDFS	2,246	$72	12/31/2023
Point72 Asset Management L.P.	2,200	$71	12/31/2023
PDFS	2,200	$71	12/31/2023
Metropolitan Life Insurance Co NY	1,914	$62	12/31/2023
PDFS	1,914	$62	12/31/2023
State of Wyoming	1,677	$54	12/31/2023
PDFS	1,677	$54	12/31/2023
Point72 Middle East FZE	1,583	$51	12/31/2023
PDFS	1,583	$51	12/31/2023
Nisa Investment Advisors LLC	1,450	$47	12/31/2023
PDFS	1,450	$47	12/31/2023
Group One Trading L.P.		$35	12/31/2023
Call	1,100	$35	12/31/2023
KBC Group NV	1,044	$34	12/31/2023
PDFS	1,044	$34	12/31/2023
NBC Securities Inc.	830	$27	03/31/2024
PDFS	830	$27	03/31/2024
Huntington National Bank	825	$27	12/31/2023
PDFS	825	$27	12/31/2023
UMB Bank N A MO	695	$22	12/31/2023
PDFS	695	$22	12/31/2023
Psagot Value Holdings Ltd. Israel	595	$19	12/31/2023
PDFS	595	$19	12/31/2023
Federated Hermes Inc.	527	$17	12/31/2023
PDFS	527	$17	12/31/2023
GAMMA Investing LLC	489	$16	03/31/2024
PDFS	489	$16	03/31/2024
Blume Capital Management Inc.	500	$16	12/31/2023
PDFS	500	$16	12/31/2023
Pacer Advisors Inc.	456	$15	12/31/2023
PDFS	456	$15	12/31/2023
Versant Capital Management Inc	381	$13	03/31/2024
PDFS	381	$13	03/31/2024
CWM LLC	292	$10	03/31/2024
PDFS	292	$10	03/31/2024
SYSTM Wealth Solutions LLC	211	$7	12/31/2023
PDFS	211	$7	12/31/2023
Massmutual Trust Co. FSB ADV	179	$6	03/31/2024
PDFS	179	$6	03/31/2024
Signaturefd LLC	181	$6	12/31/2023
PDFS	181	$6	12/31/2023
Mitsubishi UFJ Kokusai Asset Management Co. Ltd.	137	$4	12/31/2023
PDFS	137	$4	12/31/2023
MCF Advisors LLC	81	$3	03/31/2024
PDFS	81	$3	03/31/2024
Advisory Services Network LLC	100	$3	12/31/2023
PDFS	100	$3	12/31/2023
Tortoise Investment Management LLC	90	$3	12/31/2023
PDFS	90	$3	12/31/2023
Pineridge Advisors LLC	105	$3	12/31/2023
PDFS	105	$3	12/31/2023
Allworth Financial LP	54	$2	12/31/2023
PDFS	54	$2	12/31/2023
First Horizon Advisors Inc.	52	$2	12/31/2023
PDFS	52	$2	12/31/2023
Parallel Advisors LLC	62	$2	12/31/2023
PDFS	62	$2	12/31/2023
Global Retirement Partners LLC	54	$2	12/31/2023
PDFS	54	$2	12/31/2023
BOKF NA	22	$1	12/31/2023
PDFS	22	$1	12/31/2023
Fifth Third Bancorp	35	$1	12/31/2023
PDFS	35	$1	12/31/2023
Farmers & Merchants Investments Inc.	21	$1	12/31/2023
PDFS	21	$1	12/31/2023
Lindbrook Capital LLC	23	$1	12/31/2023
PDFS	23	$1	12/31/2023
Proequities Inc.		$0	12/31/2023
Put	0	$0	12/31/2023
Call	0	$0	12/31/2023
PDFS	0	$0	12/31/2023
Parkside Financial Bank & Trust	7	$0	12/31/2023
PDFS	7	$0	12/31/2023
Quadrant Capital Group LLC	13	$0	12/31/2023
PDFS	13	$0	12/31/2023
Covestor Ltd	12	$0	12/31/2023
PDFS	12	$0	12/31/2023
Farther Finance Advisors LLC	11	$0	12/31/2023
PDFS	11	$0	12/31/2023