XIAO DEMING (Pres. of MPS Asia Operations) sold 12.7% of their position (30K shares) of MONOLITHIC POWER SYSTEMS INC on the open market

Open‑market sale worth $49.64M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 4 sales

XIAO DEMING

Filed: 5/8/2026ACC: 0001214659-26-005858

InsiderXIAO DEMINGCIK 1308647

→

IssuerMONOLITHIC POWER SYSTEMS INCCIK 1280452

Officer· Pres. of MPS Asia Operations

Since Aug 2018

-30K

Net shares

Net seller

$49.64M

Total sold

Open market trades

0B · 4S

Total transactions

30K disposed

Non-Derivative Transactions4

Common Stock

Direct

S · Sale

−3.33K

Price / share

$1.65K

Trade value

$5.49M

% of position

1.4%

5/6/2026

235.96K→232.63K

Common Stock

Direct

S · Sale

−14.17K

Price / share

$1.65K

Trade value

$23.42M

% of position

6.1%

5/6/2026

232.63K→218.46K

Common Stock

Direct

S · Sale

−11.60K

Price / share

$1.66K

Trade value

$19.23M

% of position

5.3%

5/6/2026

218.46K→206.87K

Common Stock

Direct

S · Sale

−907.00

Price / share

$1.66K

Trade value

$1.51M

% of position

0.4%

5/6/2026

206.87K→205.96K

Total

Net shares

−30K

Net value

-$49.64M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	5/6/2026	S · Sale	−3.33K	$1.65K	$5.49M	1.4%	235.96K	232.63K
Common Stock Direct	5/6/2026	S · Sale	−14.17K	$1.65K	$23.42M	6.1%	232.63K	218.46K
Common Stock Direct	5/6/2026	S · Sale	−11.60K	$1.66K	$19.23M	5.3%	218.46K	206.87K
Common Stock Direct	5/6/2026	S · Sale	−907.00	$1.66K	$1.51M	0.4%	206.87K	205.96K
Total			−30K		-$49.64M

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned20.45K

Common Stock

Indirect

Shares owned4.34K

Total

24.79K indirect24.79K

Security Title	Shares Owned	Ownership Type
Common Stock	20.45K	Indirect
Common Stock	4.34K	Indirect
Total	24.79K	24.79K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported