SCIAMMAS MAURICE (Sr. V.P.of Sales and Marketing) sold 9.0% of their position (15K shares) of MONOLITHIC POWER SYSTEMS, INC. on the open market

Open‑market sale worth $20.25M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 18 sales

SCIAMMAS MAURICE

Filed: 7/17/2026ACC: 0001214659-26-008703

InsiderSCIAMMAS MAURICECIK 1360833

→

IssuerMONOLITHIC POWER SYSTEMS, INC.CIK 1280452

Officer· Sr. V.P.of Sales and Marketing

Since Aug 2018

-15K

Net shares

Net seller

$20.25M

Total sold

Open market trades

0B · 18S

Total transactions

15K disposed

Non-Derivative Transactions18

Common Stock

Direct

S · Sale

−527.00

Price / share

$1.31K

Trade value

$692.49K

% of position

0.3%

7/15/2026

166.64K→166.12K

Common Stock

Direct

S · Sale

−274.00

Price / share

$1.32K

Trade value

$361.25K

% of position

0.2%

7/15/2026

166.12K→165.84K

Common Stock

Direct

S · Sale

−409.00

Price / share

$1.32K

Trade value

$541.49K

% of position

0.2%

7/15/2026

165.84K→165.43K

Common Stock

Direct

S · Sale

−464.00

Price / share

$1.33K

Trade value

$616.80K

% of position

0.3%

7/15/2026

165.43K→164.97K

Common Stock

Direct

S · Sale

−776.00

Price / share

$1.33K

Trade value

$1.04M

% of position

0.5%

7/15/2026

164.97K→164.19K

Common Stock

Direct

S · Sale

−1.46K

Price / share

$1.34K

Trade value

$1.96M

% of position

0.9%

7/15/2026

164.19K→162.73K

Common Stock

Direct

S · Sale

−1.86K

Price / share

$1.34K

Trade value

$2.51M

% of position

1.1%

7/15/2026

162.73K→160.87K

Common Stock

Direct

S · Sale

−1.51K

Price / share

$1.35K

Trade value

$2.03M

% of position

0.9%

7/15/2026

160.87K→159.36K

Common Stock

Direct

S · Sale

−5.64K

Price / share

$1.35K

Trade value

$7.63M

% of position

3.5%

7/15/2026

159.36K→153.72K

Common Stock

Direct

S · Sale

−50.00

Price / share

$1.36K

Trade value

$67.97K

% of position

0.0%

7/15/2026

153.72K→153.67K

Common Stock

Direct

S · Sale

−240.00

Price / share

$1.37K

Trade value

$328.60K

% of position

0.2%

7/15/2026

153.67K→153.43K

Common Stock

Direct

S · Sale

−472.00

Price / share

$1.38K

Trade value

$649.22K

% of position

0.3%

7/15/2026

153.43K→152.96K

Common Stock

Direct

S · Sale

−418.00

Price / share

$1.38K

Trade value

$576.31K

% of position

0.3%

7/15/2026

152.96K→152.54K

Common Stock

Direct

S · Sale

−410.00

Price / share

$1.38K

Trade value

$567.49K

% of position

0.3%

7/15/2026

152.54K→152.13K

Common Stock

Direct

S · Sale

−50.00

Price / share

$1.39K

Trade value

$69.41K

% of position

0.0%

7/15/2026

152.13K→152.08K

Common Stock

Direct

S · Sale

−213.00

Price / share

$1.40K

Trade value

$297.38K

% of position

0.1%

7/15/2026

152.08K→151.87K

Common Stock

Direct

S · Sale

−117.00

Price / share

$1.40K

Trade value

$163.85K

% of position

0.1%

7/15/2026

151.87K→151.75K

Common Stock

Direct

S · Sale

−110.00

Price / share

$1.41K

Trade value

$154.63K

% of position

0.1%

7/15/2026

151.75K→151.64K

Total

Net shares

−15K

Net value

-$20.25M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	7/15/2026	S · Sale	−527.00	$1.31K	$692.49K	0.3%	166.64K	166.12K
Common Stock Direct	7/15/2026	S · Sale	−274.00	$1.32K	$361.25K	0.2%	166.12K	165.84K
Common Stock Direct	7/15/2026	S · Sale	−409.00	$1.32K	$541.49K	0.2%	165.84K	165.43K
Common Stock Direct	7/15/2026	S · Sale	−464.00	$1.33K	$616.80K	0.3%	165.43K	164.97K
Common Stock Direct	7/15/2026	S · Sale	−776.00	$1.33K	$1.04M	0.5%	164.97K	164.19K
Common Stock Direct	7/15/2026	S · Sale	−1.46K	$1.34K	$1.96M	0.9%	164.19K	162.73K
Common Stock Direct	7/15/2026	S · Sale	−1.86K	$1.34K	$2.51M	1.1%	162.73K	160.87K
Common Stock Direct	7/15/2026	S · Sale	−1.51K	$1.35K	$2.03M	0.9%	160.87K	159.36K
Common Stock Direct	7/15/2026	S · Sale	−5.64K	$1.35K	$7.63M	3.5%	159.36K	153.72K
Common Stock Direct	7/15/2026	S · Sale	−50.00	$1.36K	$67.97K	0.0%	153.72K	153.67K
Common Stock Direct	7/15/2026	S · Sale	−240.00	$1.37K	$328.60K	0.2%	153.67K	153.43K
Common Stock Direct	7/15/2026	S · Sale	−472.00	$1.38K	$649.22K	0.3%	153.43K	152.96K
Common Stock Direct	7/15/2026	S · Sale	−418.00	$1.38K	$576.31K	0.3%	152.96K	152.54K
Common Stock Direct	7/15/2026	S · Sale	−410.00	$1.38K	$567.49K	0.3%	152.54K	152.13K
Common Stock Direct	7/15/2026	S · Sale	−50.00	$1.39K	$69.41K	0.0%	152.13K	152.08K
Common Stock Direct	7/15/2026	S · Sale	−213.00	$1.40K	$297.38K	0.1%	152.08K	151.87K
Common Stock Direct	7/15/2026	S · Sale	−117.00	$1.40K	$163.85K	0.1%	151.87K	151.75K
Common Stock Direct	7/15/2026	S · Sale	−110.00	$1.41K	$154.63K	0.1%	151.75K	151.64K
Total			−15K		-$20.25M

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)11

Common Stock

Indirect

Shares owned4.01K

Common Stock

Indirect

Shares owned919.00

Common Stock

Indirect

Shares owned1.70K

Common Stock

Indirect

Shares owned52.59K

Common Stock

Indirect

Shares owned11.06K

Common Stock

Indirect

Shares owned1.70K

Common Stock

Indirect

Shares owned1.15K

Common Stock

Indirect

Shares owned2K

Common Stock

Indirect

Shares owned1K

Common Stock

Indirect

Shares owned1.70K

Common Stock

Indirect

Shares owned5K

Total

82.83K indirect82.83K

Security Title	Shares Owned	Ownership Type
Common Stock	4.01K	Indirect
Common Stock	919.00	Indirect
Common Stock	1.70K	Indirect
Common Stock	52.59K	Indirect
Common Stock	11.06K	Indirect
Common Stock	1.70K	Indirect
Common Stock	1.15K	Indirect
Common Stock	2K	Indirect
Common Stock	1K	Indirect
Common Stock	1.70K	Indirect
Common Stock	5K	Indirect
Total	82.83K	82.83K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported