Theodore Blegen Insider Trading Activity

Corporate InsiderCFO · CIK 1415033

Total trades

$47.1M

Total volume

Feb 6, 2026

Last activity

MPWR

MONOLITHIC POWER SYSTEMS INC

Theodore Blegen has been net-selling over the last 12 months with 0 purchases and 67 sales across 1 company.

MPWR is the most-traded position with 67 trades. The largest single transaction was a sale of MPWR for $25.4M on Feb 6, 2026.

Performance Scorecard

Forward stock performance after each transaction by Theodore Blegen. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.

PERIOD	AVG BUY RETURN	AVG SELL AVOIDED	SUCCESS RATE	TRADES
30 days	—	-4.7%	51%	68
90 days	—	-18.6%	0%	68
120 days	—	-28.6%	0%	68

Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.

Price & Trades

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MPWR · MONOLITHIC POWER SYSTEMS INC

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Recent Trades

Showing the 50 most recent of 68 disclosed trades.

DATE	TICKER	TYPE	SHARES	PRICE	VALUE	Δ OWNED	ROLE
Feb 6, 2026	MPWR	Sell	21,725	$1171.16	$25.4M	−20.9%	CFO
Feb 2, 2026	MPWR	Sell	220	$1110.58	$244K	−0.3%	CFO
Feb 2, 2026	MPWR	Sell	40	$1117.11	$45K	−0.1%	CFO
Feb 2, 2026	MPWR	Sell	80	$1120.77	$90K	−0.1%	CFO
Feb 2, 2026	MPWR	Sell	200	$1126.58	$225K	−0.3%	CFO
Feb 2, 2026	MPWR	Sell	240	$1128.43	$271K	−0.4%	CFO
Feb 2, 2026	MPWR	Sell	320	$1130.48	$362K	−0.5%	CFO
Feb 2, 2026	MPWR	Sell	198	$1131.70	$224K	−0.3%	CFO
Feb 2, 2026	MPWR	Sell	322	$1132.67	$365K	−0.5%	CFO
Feb 2, 2026	MPWR	Sell	379	$1133.47	$430K	−0.6%	CFO
Feb 2, 2026	MPWR	Sell	241	$1134.41	$273K	−0.4%	CFO
Feb 2, 2026	MPWR	Sell	120	$1135.49	$136K	−0.2%	CFO
Jan 2, 2026	MPWR	Sell	80	$927.61	$74K	−0.1%	CFO
Jan 2, 2026	MPWR	Sell	194	$930.86	$181K	−0.3%	CFO
Jan 2, 2026	MPWR	Sell	40	$934.74	$37K	−0.1%	CFO
Jan 2, 2026	MPWR	Sell	120	$936.50	$112K	−0.2%	CFO
Jan 2, 2026	MPWR	Sell	460	$938.52	$432K	−0.7%	CFO
Jan 2, 2026	MPWR	Sell	117	$939.75	$110K	−0.2%	CFO
Jan 2, 2026	MPWR	Sell	406	$941.60	$382K	−0.6%	CFO
Jan 2, 2026	MPWR	Sell	74	$942.42	$70K	−0.1%	CFO
Jan 2, 2026	MPWR	Sell	539	$943.71	$509K	−0.8%	CFO
Jan 2, 2026	MPWR	Sell	650	$944.35	$614K	−0.9%	CFO
Dec 1, 2025	MPWR	Sell	40	$899.73	$36K	−0.1%	CFO
Dec 1, 2025	MPWR	Sell	80	$901.88	$72K	−0.1%	CFO
Dec 1, 2025	MPWR	Sell	120	$904.38	$109K	−0.2%	CFO
Dec 1, 2025	MPWR	Sell	480	$908.69	$436K	−0.6%	CFO
Dec 1, 2025	MPWR	Sell	1,984	$909.00	$1.8M	−2.7%	CFO
Dec 1, 2025	MPWR	Sell	56	$911.59	$51K	−0.1%	CFO
Nov 3, 2025	MPWR	Sell	204	$1013.62	$207K	−0.3%	CFO
Nov 3, 2025	MPWR	Sell	135	$1014.47	$137K	−0.2%	CFO
Nov 3, 2025	MPWR	Sell	80	$1016.51	$81K	−0.1%	CFO
Nov 3, 2025	MPWR	Sell	6	$1017.78	$6K	−0.0%	CFO
Nov 3, 2025	MPWR	Sell	180	$1018.01	$183K	−0.2%	CFO
Nov 3, 2025	MPWR	Sell	181	$1019.49	$185K	−0.2%	CFO
Nov 3, 2025	MPWR	Sell	160	$1020.30	$163K	−0.2%	CFO
Nov 3, 2025	MPWR	Sell	168	$1021.28	$172K	−0.2%	CFO
Nov 3, 2025	MPWR	Sell	40	$1022.28	$41K	−0.1%	CFO
Nov 3, 2025	MPWR	Sell	291	$1023.32	$298K	−0.4%	CFO
Nov 3, 2025	MPWR	Sell	208	$1024.86	$213K	−0.3%	CFO
Nov 3, 2025	MPWR	Sell	43	$1025.91	$44K	−0.1%	CFO
Nov 3, 2025	MPWR	Sell	200	$1027.49	$205K	−0.3%	CFO
Nov 3, 2025	MPWR	Sell	240	$1028.43	$247K	−0.3%	CFO
Nov 3, 2025	MPWR	Sell	246	$1029.45	$253K	−0.3%	CFO
Nov 3, 2025	MPWR	Sell	210	$1030.00	$216K	−0.3%	CFO
Nov 3, 2025	MPWR	Sell	17	$1031.86	$18K	−0.0%	CFO
Nov 3, 2025	MPWR	Sell	184	$1032.07	$190K	−0.2%	CFO
Nov 3, 2025	MPWR	Sell	47	$1038.41	$49K	−0.1%	CFO
Oct 1, 2025	MPWR	Sell	6	$902.61	$5K	−0.0%	CFO
Oct 1, 2025	MPWR	Sell	40	$903.82	$36K	−0.1%	CFO
Oct 1, 2025	MPWR	Sell	60	$904.00	$54K	−0.1%	CFO