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Cowen Prime Services LLC
> PDFS
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2021 | PDF SOLUTIONS INC | PDFS | 1,889,528 | 327,002 | 34,352,000 | 601,000 | $18.18 |
| 12/31/2020 | PDF SOLUTIONS INC | PDFS | 1,562,526 | -81,152 | 33,751,000 | 2,998,000 | $21.60 |
| 09/30/2020 | PDF SOLUTIONS INC | PDFS | 1,643,678 | 43,900 | 30,753,000 | -539,000 | $18.71 |
| 06/30/2020 | PDF SOLUTIONS INC | PDFS | 1,599,778 | -59,631 | 31,292,000 | 11,844,000 | $19.56 |
| 06/03/2020 | PDF SOLUTIONS INC | PDFS | 1,624,378 | -35,031 | 27,663,157 | 8,215,157 | $17.03 |
| 03/31/2020 | PDF SOLUTIONS INC | PDFS | 1,659,409 | 290,369 | 19,448,000 | -3,675,000 | $11.72 |
| 12/31/2019 | PDF SOLUTIONS INC | PDFS | 1,369,040 | 131,940 | 23,123,000 | 6,954,000 | $16.89 |
| 09/30/2019 | PDF SOLUTIONS INC | PDFS | 1,237,100 | 118,200 | 16,169,000 | 1,489,000 | $13.07 |
| 06/30/2019 | PDF SOLUTIONS INC | PDFS | 1,118,900 | 330,529 | 14,680,000 | 4,944,000 | $13.12 |
| 03/31/2019 | PDF SOLUTIONS INC | PDFS | 788,371 | 44,300 | 9,736,000 | 3,463,000 | $12.35 |
| 12/31/2018 | PDF SOLUTIONS INC | PDFS | 744,071 | -15,580 | 6,273,000 | -587,000 | $8.43 |
| 09/30/2018 | PDF SOLUTIONS INC | PDFS | 759,651 | -199,433 | 6,860,000 | -4,630,000 | $9.03 |
| 06/30/2018 | PDF SOLUTIONS INC | PDFS | 959,084 | 300 | 11,490,000 | 311,000 | $11.98 |
| 03/31/2018 | PDF SOLUTIONS INC | PDFS | 958,784 | -250,916 | 11,179,000 | -7,813,000 | $11.66 |
| 12/31/2017 | PDF SOLUTIONS INC | PDFS | 1,209,700 | -86,200 | 18,992,000 | -1,081,000 | $15.70 |
| 09/30/2017 | PDF SOLUTIONS INC | PDFS | 1,295,900 | 177,717 | 20,073,000 | 1,679,000 | $15.49 |
| 06/30/2017 | PDF SOLUTIONS INC | PDFS | 1,118,183 | 58,228 | 18,394,000 | -5,582,000 | $16.45 |
| 03/31/2017 | PDF SOLUTIONS INC | PDFS | 1,059,955 | 33,600 | 23,976,000 | 832,000 | $22.62 |
| 12/31/2016 | PDF SOLUTIONS INC | PDFS | 1,026,355 | -230,385 | 23,144,000 | 309,000 | $22.55 |
| 09/30/2016 | PDF SOLUTIONS INC | PDFS | 1,256,740 | -86,900 | 22,835,000 | 4,037,000 | $18.17 |
| 06/30/2016 | PDF SOLUTIONS INC | PDFS | 1,343,640 | -80,900 | 18,798,000 | -262,000 | $13.99 |
| 03/31/2016 | PDF SOLUTIONS INC | PDFS | 1,424,540 | -1,081,176 | 19,060,000 | -34,136,000 | $13.38 |
| 12/31/2015 | PDF SOLUTIONS INC | PDFS | 1,409,440 | -1,096,276 | 15,278,000 | -37,918,000 | $10.84 |
| 09/30/2015 | PDF SOLUTIONS INC | PDFS | 1,419,940 | 110,900 | 14,199,000 | -6,746,000 | $10.00 |
| 06/30/2015 | PDF SOLUTIONS INC | PDFS | 1,309,040 | -186,200 | 20,945,000 | -6,224,000 | $16.00 |
| 03/31/2015 | PDF SOLUTIONS INC | PDFS | 1,385,240 | -62,100 | 24,824,000 | 6,573,000 | $17.92 |
| 12/31/2014 | PDF SOLUTIONS INC | PDFS | 1,525,190 | 77,850 | 22,664,000 | 4,413,000 | $14.86 |
| 09/30/2014 | PDF SOLUTIONS INC | PDFS | 1,447,340 | -47,900 | 18,251,000 | -8,918,000 | $12.61 |
| 06/30/2014 | PDF SOLUTIONS INC | PDFS | 1,542,540 | 47,300 | 32,733,000 | 5,564,000 | $21.22 |
| 03/31/2014 | PDF SOLUTIONS INC | PDFS | 1,495,240 | -1,010,476 | 27,169,000 | -26,027,000 | $18.17 |
| 12/31/2013 | PDF SOLUTIONS INC | PDFS | 1,678,475 | -827,241 | 43,003,000 | -10,193,000 | $25.62 |
| 09/30/2013 | PDF SOLUTIONS INC | PDFS | 2,505,716 | -675,500 | 53,196,000 | -5,497,000 | $21.23 |
| 06/30/2013 | PDF SOLUTIONS INC | PDFS | 3,181,216 | -36,460 | 58,693,000 | 7,145,830 | $18.45 |
| 03/31/2013 | PDF SOLUTIONS INC | PDFS | 3,217,676 | -116,895 | 51,547,170 | 5,596,782 | $16.02 |
| 12/31/2012 | PDF SOLUTIONS INC | PDFS | 3,334,571 | -142,600 | 45,950,388 | -1,547,772 | $13.78 |
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