PDF SOLUTIONS INC

Ticker: PDFS CUSIP: 693282105 Class: Common Stock

NORTHERN TRUST CORP's Holding History (CIK: 0000073124)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 347,934 Value ($000) $9,927 Avg Close $27.67 Range $23.55 - $32.31

Q3 2025

Shares 363,789 Value ($000) $9,393 Avg Close $21.84 Range $18.12 - $26.59

Q2 2025

Shares 372,534 Value ($000) $7,965 Avg Close $18.93 Range $15.91 - $21.57

Q1 2025

Shares 393,944 Value ($000) $7,528 Avg Close $24.54 Range $18.50 - $29.50

Q4 2024

Shares 405,286 Value ($000) $10,975 Avg Close $30.15 Range $26.94 - $33.42

Q3 2024

Shares 372,396 Value ($000) $11,798 Avg Close $32.46 Range $27.69 - $39.70

Q2 2024

Shares 380,300 Value ($000) $13,835 Avg Close $33.44 Range $29.21 - $37.16

Q1 2024

Shares 389,434 Value ($000) $13,112 Avg Close $32.80 Range $28.99 - $35.89

Q4 2023

Shares 396,074 Value ($000) $12,730 Avg Close $30.32 Range $26.12 - $34.09

Q3 2023

Shares 398,230 Value ($000) $12,903 Avg Close $38.29 Range $30.80 - $48.02

Q2 2023

Shares 398,372 Value ($000) $17,967 Avg Close $40.80 Range $32.25 - $45.80

Q1 2023

Shares 387,663 Value ($000) $16,437 Avg Close $35.04 Range $27.23 - $42.50

Q4 2022

Shares 386,398 Value ($000) $11,020 Avg Close $27.01 Range $21.36 - $32.56

Q3 2022

Shares 382,661 Value ($000) $9,387 Avg Close $25.27 Range $20.16 - $30.31

Q2 2022

Shares 386,247 Value ($000) $8,308 Avg Close $23.11 Range $19.34 - $28.11

Q1 2022

Shares 363,539 Value ($000) $10,132 Avg Close $27.92 Range $23.73 - $32.80

Q4 2021

Shares 372,937 Value ($000) $11,855 Avg Close $27.81 Range $22.46 - $33.78

Q3 2021

Shares 376,836 Value ($000) $8,682 Avg Close $20.60 Range $17.29 - $24.20

Q2 2021

Shares 384,526 Value ($000) $6,990 Avg Close $17.92 Range $16.70 - $19.76

Q1 2021

Shares 402,225 Value ($000) $7,152 Avg Close $19.82 Range $16.44 - $23.50

Q4 2020

Shares 435,773 Value ($000) $9,413 Avg Close $20.99 Range $18.51 - $23.42

Q3 2020

Shares 451,036 Value ($000) $8,439 Avg Close $20.60 Range $18.18 - $26.42

Q2 2020

Shares 465,316 Value ($000) $9,101 Avg Close $16.25 Range $11.05 - $19.64

Q1 2020

Shares 396,629 Value ($000) $4,649 Avg Close $14.77 Range $8.61 - $18.41

Q4 2019

Shares 397,614 Value ($000) $6,716 Avg Close $15.34 Range $12.53 - $17.42

Q3 2019

Shares 405,026 Value ($000) $5,294 Avg Close $12.62 Range $11.16 - $13.84

Q2 2019

Shares 386,012 Value ($000) $5,064 Avg Close $12.83 Range $11.77 - $14.00

Q1 2019

Shares 372,348 Value ($000) $4,599 Avg Close $11.05 Range $8.24 - $13.53

Q4 2018

Shares 364,479 Value ($000) $3,073 Avg Close $8.48 Range $7.56 - $9.45

Q3 2018

Shares 373,750 Value ($000) $3,375 Avg Close $10.06 Range $8.10 - $12.66

Q2 2018

Shares 369,747 Value ($000) $4,429 Avg Close $11.94 Range $9.62 - $13.84

Q1 2018

Shares 380,210 Value ($000) $4,434 Avg Close $13.29 Range $11.07 - $16.76

Q4 2017

Shares 367,227 Value ($000) $5,766 Avg Close $16.06 Range $14.12 - $18.48

Q3 2017

Shares 371,617 Value ($000) $5,757 Avg Close $16.12 Range $14.11 - $20.10

Q2 2017

Shares 375,563 Value ($000) $6,178 Avg Close $18.56 Range $16.07 - $23.93

Q1 2017

Shares 366,516 Value ($000) $8,291 Avg Close $22.28 Range $21.03 - $23.40

Q4 2016

Shares 359,154 Value ($000) $8,099 Avg Close $20.91 Range $17.45 - $24.44

Q3 2016

Shares 707,680 Value ($000) $12,859 Avg Close $16.29 Range $13.48 - $18.18

Q2 2016

Shares 717,680 Value ($000) $10,041 Avg Close $13.59 Range $12.09 - $15.25

Q1 2016

Shares 715,861 Value ($000) $8,233 Avg Close $10.95 Range $8.70 - $14.73

Q4 2015

Shares 834,643 Value ($000) $9,047 Avg Close $10.84 Range $9.68 - $11.76

Q3 2015

Shares 855,278 Value ($000) $8,552 Avg Close $12.57 Range $9.91 - $16.45

Q2 2015

Shares 332,230 Value ($000) $5,316 Avg Close $17.19 Range $14.76 - $19.52

Q1 2015

Shares 736,648 Value ($000) $13,200 Avg Close $17.39 Range $13.31 - $18.80

Q4 2014

Shares 654,724 Value ($000) $9,729 Avg Close $13.09 Range $11.62 - $15.24

Q3 2014

Shares 528,524 Value ($000) $6,664 Avg Close $19.84 Range $12.26 - $22.66

Q2 2014

Shares 318,248 Value ($000) $6,753 Avg Close $19.12 Range $16.60 - $21.77

Q1 2014

Shares 450,654 Value ($000) $8,188 Avg Close $22.07 Range $17.21 - $26.73

Q4 2013

Shares 368,950 Value ($000) $9,453 Avg Close $22.99 Range $20.12 - $25.90

Q3 2013

Shares 357,978 Value ($000) $7,600 Avg Close $20.57 Range $18.09 - $22.20

Q2 2013

Shares 353,848 Value ($000) $6,522 Avg Close $17.41 Range $14.95 - $19.03

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	347,934	$9,927	$27.67	$23.55 - $32.31
Q3 2025	363,789	$9,393	$21.84	$18.12 - $26.59
Q2 2025	372,534	$7,965	$18.93	$15.91 - $21.57
Q1 2025	393,944	$7,528	$24.54	$18.50 - $29.50
Q4 2024	405,286	$10,975	$30.15	$26.94 - $33.42
Q3 2024	372,396	$11,798	$32.46	$27.69 - $39.70
Q2 2024	380,300	$13,835	$33.44	$29.21 - $37.16
Q1 2024	389,434	$13,112	$32.80	$28.99 - $35.89
Q4 2023	396,074	$12,730	$30.32	$26.12 - $34.09
Q3 2023	398,230	$12,903	$38.29	$30.80 - $48.02
Q2 2023	398,372	$17,967	$40.80	$32.25 - $45.80
Q1 2023	387,663	$16,437	$35.04	$27.23 - $42.50
Q4 2022	386,398	$11,020	$27.01	$21.36 - $32.56
Q3 2022	382,661	$9,387	$25.27	$20.16 - $30.31
Q2 2022	386,247	$8,308	$23.11	$19.34 - $28.11
Q1 2022	363,539	$10,132	$27.92	$23.73 - $32.80
Q4 2021	372,937	$11,855	$27.81	$22.46 - $33.78
Q3 2021	376,836	$8,682	$20.60	$17.29 - $24.20
Q2 2021	384,526	$6,990	$17.92	$16.70 - $19.76
Q1 2021	402,225	$7,152	$19.82	$16.44 - $23.50
Q4 2020	435,773	$9,413	$20.99	$18.51 - $23.42
Q3 2020	451,036	$8,439	$20.60	$18.18 - $26.42
Q2 2020	465,316	$9,101	$16.25	$11.05 - $19.64
Q1 2020	396,629	$4,649	$14.77	$8.61 - $18.41
Q4 2019	397,614	$6,716	$15.34	$12.53 - $17.42
Q3 2019	405,026	$5,294	$12.62	$11.16 - $13.84
Q2 2019	386,012	$5,064	$12.83	$11.77 - $14.00
Q1 2019	372,348	$4,599	$11.05	$8.24 - $13.53
Q4 2018	364,479	$3,073	$8.48	$7.56 - $9.45
Q3 2018	373,750	$3,375	$10.06	$8.10 - $12.66
Q2 2018	369,747	$4,429	$11.94	$9.62 - $13.84
Q1 2018	380,210	$4,434	$13.29	$11.07 - $16.76
Q4 2017	367,227	$5,766	$16.06	$14.12 - $18.48
Q3 2017	371,617	$5,757	$16.12	$14.11 - $20.10
Q2 2017	375,563	$6,178	$18.56	$16.07 - $23.93
Q1 2017	366,516	$8,291	$22.28	$21.03 - $23.40
Q4 2016	359,154	$8,099	$20.91	$17.45 - $24.44
Q3 2016	707,680	$12,859	$16.29	$13.48 - $18.18
Q2 2016	717,680	$10,041	$13.59	$12.09 - $15.25
Q1 2016	715,861	$8,233	$10.95	$8.70 - $14.73
Q4 2015	834,643	$9,047	$10.84	$9.68 - $11.76
Q3 2015	855,278	$8,552	$12.57	$9.91 - $16.45
Q2 2015	332,230	$5,316	$17.19	$14.76 - $19.52
Q1 2015	736,648	$13,200	$17.39	$13.31 - $18.80
Q4 2014	654,724	$9,729	$13.09	$11.62 - $15.24
Q3 2014	528,524	$6,664	$19.84	$12.26 - $22.66
Q2 2014	318,248	$6,753	$19.12	$16.60 - $21.77
Q1 2014	450,654	$8,188	$22.07	$17.21 - $26.73
Q4 2013	368,950	$9,453	$22.99	$20.12 - $25.90
Q3 2013	357,978	$7,600	$20.57	$18.09 - $22.20
Q2 2013	353,848	$6,522	$17.41	$14.95 - $19.03