X0306
4
2018-02-15
0001280452
MONOLITHIC POWER SYSTEMS INC
MPWR
0001312593
Tseng Saria
79 GREAT OAKS BLVD
SAN JOSE
CA
95119
1
VP & General Counsel
Common Stock
2018-02-15
4
J
0
173
86.513
A
332105
D
Common Stock
2018-02-22
4
S
0
26429
117.3395
D
305676
D
Acquired through the Company's qualified ESPP program.
In accordance with the reporting person's 10b5-1 trading plan.
The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $116.32 to $118.20. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
/s/ Saria Tseng
2018-02-26