POWER INTEGRATIONS INC

Ticker: POWI CUSIP: 739276103 Class: Common Stock

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

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

Q4 2017
Shares 12,545 Value ($000) $923 Avg Close $35.18 Range $32.26 - $39.91
Q3 2017
Shares 12,545 Value ($000) $918 Avg Close $33.61 Range $30.70 - $38.09
Q2 2017
Shares 12,545 Value ($000) $915 Avg Close $30.45 Range $28.41 - $34.96
Q1 2017
Shares 12,545 Value ($000) $825 Avg Close $30.47 Range $28.17 - $33.28
Q4 2016
Shares 12,910 Value ($000) $876 Avg Close $29.96 Range $27.74 - $32.06
Q3 2016
Shares 12,910 Value ($000) $814 Avg Close $25.95 Range $21.76 - $28.92
Q2 2016
Shares 12,910 Value ($000) $646 Avg Close $22.25 Range $20.39 - $24.96
Q1 2016
Shares 12,910 Value ($000) $641 Avg Close $20.90 Range $17.93 - $22.74
Q4 2015
Shares 12,910 Value ($000) $628 Avg Close $22.06 Range $18.20 - $23.98
Q3 2015
Shares 13,680 Value ($000) $577 Avg Close $18.09 Range $16.26 - $20.65
Q2 2015
Shares 13,730 Value ($000) $620 Avg Close $22.52 Range $19.63 - $24.33
Q1 2015
Shares 13,730 Value ($000) $715 Avg Close $24.21 Range $22.14 - $26.42