Victor K Lee

Insider

First SEC filing: Sept. 15, 2006 · Latest: Sept. 15, 2006

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Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Initial holdings The stakes this person held when they first started reporting.

Insider at

MPWR selling Feb. 9, 2026

Insider transactions

0 buys (P) 8 sells (S) Net: $-1,995,099 + 66 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

66 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Feb. 9, 2026	MPWR	S 10b5-1	400	$1212.16	$484,864	27,756 Direct	-1.42%	Disposed	8.0% (price as of 2026-08-20)
Feb. 3, 2026	MPWR	A	189	—	—	28,156 Direct	+0.68%	Acquired	(price as of 2026-08-20)
Jan. 2, 2026	MPWR	S 10b5-1	600	$930.86	$558,516	27,967 Direct	-2.10%	Disposed	40.7% (price as of 2026-08-20)
Dec. 24, 2025	MPWR	S 10b5-1	80	$955.08	$76,406	28,567 Direct	-0.28%	Disposed	37.1% (price as of 2026-08-20)
Dec. 24, 2025	MPWR	S 10b5-1	200	$953.70	$190,740	28,647 Direct	-0.69%	Disposed	37.3% (price as of 2026-08-20)
Dec. 24, 2025	MPWR	S 10b5-1	83	$952.37	$79,047	28,847 Direct	-0.29%	Disposed	37.5% (price as of 2026-08-20)
Dec. 24, 2025	MPWR	S 10b5-1	160	$951.60	$152,256	28,930 Direct	-0.55%	Disposed	37.6% (price as of 2026-08-20)
Dec. 24, 2025	MPWR	S 10b5-1	280	$950.64	$266,179	29,090 Direct	-0.95%	Disposed	37.7% (price as of 2026-08-20)
Dec. 24, 2025	MPWR	S 10b5-1	197	$949.70	$187,091	29,370 Direct	-0.67%	Disposed	37.9% (price as of 2026-08-20)
Feb. 4, 2025	MPWR	A	335	—	—	29,567 Direct	+1.15%	Acquired	(price as of 2026-08-20)
June 28, 2024	MPWR	S	1,000	$820.46	$820,460	29,232 Direct	-3.31%	Disposed	59.6% (price as of 2026-08-20)
Feb. 6, 2024	MPWR	A	348	—	—	30,232 Direct	+1.16%	Acquired	(price as of 2026-08-20)
Feb. 7, 2023	MPWR	A	470	—	—	29,884 Direct	+1.60%	Acquired	(price as of 2026-08-20)
Feb. 8, 2022	MPWR	A	542	—	—	29,414 Direct	+1.88%	Acquired	(price as of 2026-08-20)
Feb. 2, 2021	MPWR	A	533	—	—	28,872 Direct	+1.88%	Acquired	(price as of 2026-08-20)
Feb. 12, 2020	MPWR	A	1,048	—	—	28,339 Direct	+3.84%	Acquired	(price as of 2026-08-20)
Feb. 11, 2019	MPWR	A	1,339	—	—	27,291 Direct	+5.16%	Acquired	(price as of 2026-08-20)
Feb. 7, 2018	MPWR	A	1,590	—	—	25,952 Direct	+6.53%	Acquired	(price as of 2026-08-20)
Feb. 7, 2017	MPWR	A	1,566	—	—	24,362 Direct	+6.87%	Acquired	(price as of 2026-08-20)
May 27, 2016	MPWR	M	4,000	$20.20	$80,800	26,796 Direct	+17.55%	Acquired	6382.6% (price as of 2026-08-20)
May 27, 2016	MPWR	S	4,000	$68.56	$274,240	22,796 Direct	-14.93%	Disposed	1810.0% (price as of 2026-08-20)
May 27, 2016	MPWR	M	4,000	—	—	5,643 Direct	-41.48%	Disposed	(price as of 2026-08-20)
May 26, 2016	MPWR	M	5,000	$20.20	$101,000	27,796 Direct	+21.93%	Acquired	6382.6% (price as of 2026-08-20)
May 26, 2016	MPWR	S	5,000	$67.61	$338,050	22,796 Direct	-17.99%	Disposed	1836.8% (price as of 2026-08-20)
May 26, 2016	MPWR	M	357	$20.20	$7,211	23,153 Direct	+1.57%	Acquired	6382.6% (price as of 2026-08-20)
May 26, 2016	MPWR	S	357	$67.95	$24,258	22,796 Direct	-1.54%	Disposed	1827.1% (price as of 2026-08-20)
May 26, 2016	MPWR	M	5,000	—	—	10,000 Direct	-33.33%	Disposed	(price as of 2026-08-20)
May 26, 2016	MPWR	M	357	—	—	9,643 Direct	-3.57%	Disposed	(price as of 2026-08-20)
May 23, 2016	MPWR	M	5,000	$20.20	$101,000	27,796 Direct	+21.93%	Acquired	6382.6% (price as of 2026-08-20)
May 23, 2016	MPWR	S	5,000	$65.31	$326,550	22,796 Direct	-17.99%	Disposed	1905.0% (price as of 2026-08-20)
May 23, 2016	MPWR	M	5,000	$20.20	$101,000	27,796 Direct	+21.93%	Acquired	6382.6% (price as of 2026-08-20)
May 23, 2016	MPWR	S	5,000	$65.57	$327,850	22,796 Direct	-17.99%	Disposed	1897.1% (price as of 2026-08-20)
May 23, 2016	MPWR	M	5,000	—	—	20,000 Direct	-20.00%	Disposed	(price as of 2026-08-20)
May 23, 2016	MPWR	M	5,000	—	—	15,000 Direct	-25.00%	Disposed	(price as of 2026-08-20)
April 28, 2016	MPWR	A	2,181	—	—	22,796 Direct	+10.58%	Acquired	(price as of 2026-08-20)
Nov. 24, 2015	MPWR	M	1,176	$12.28	$14,441	21,791 Direct	+5.70%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 24, 2015	MPWR	S	1,176	$67.05	$78,851	20,615 Direct	-5.40%	Disposed	1853.0% (price as of 2026-08-20)
Nov. 24, 2015	MPWR	M	1,406	$12.28	$17,266	22,021 Direct	+6.82%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 24, 2015	MPWR	S	1,406	$67.05	$94,272	20,615 Direct	-6.38%	Disposed	1853.0% (price as of 2026-08-20)
Nov. 24, 2015	MPWR	M	1,176	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 24, 2015	MPWR	M	1,406	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 6, 2015	MPWR	M	5,000	$12.28	$61,400	25,615 Direct	+24.25%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 6, 2015	MPWR	S	5,000	$64.02	$320,100	20,615 Direct	-19.52%	Disposed	1945.4% (price as of 2026-08-20)
Nov. 6, 2015	MPWR	M	5,000	$12.28	$61,400	25,615 Direct	+24.25%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 6, 2015	MPWR	S	5,000	$64.02	$320,100	20,615 Direct	-19.52%	Disposed	1945.4% (price as of 2026-08-20)
Nov. 6, 2015	MPWR	M	5,000	—	—	6,406 Direct	-43.84%	Disposed	(price as of 2026-08-20)
Nov. 6, 2015	MPWR	M	5,000	—	—	1,406 Direct	-78.05%	Disposed	(price as of 2026-08-20)
Nov. 5, 2015	MPWR	M	5,000	$12.28	$61,400	25,615 Direct	+24.25%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 5, 2015	MPWR	S	5,000	$63.19	$315,950	20,615 Direct	-19.52%	Disposed	1972.3% (price as of 2026-08-20)
Nov. 5, 2015	MPWR	M	5,000	$12.28	$61,400	25,615 Direct	+24.25%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 5, 2015	MPWR	S	5,000	$63.24	$316,200	20,615 Direct	-19.52%	Disposed	1970.7% (price as of 2026-08-20)
Nov. 5, 2015	MPWR	M	5,000	—	—	16,406 Direct	-23.36%	Disposed	(price as of 2026-08-20)
Nov. 5, 2015	MPWR	M	5,000	—	—	11,406 Direct	-30.48%	Disposed	(price as of 2026-08-20)
Nov. 2, 2015	MPWR	M	594	$12.28	$7,294	21,209 Direct	+2.88%	Acquired	10563.6% (price as of 2026-08-20)
Nov. 2, 2015	MPWR	S	594	$63.18	$37,529	20,615 Direct	-2.80%	Disposed	1972.6% (price as of 2026-08-20)
Nov. 2, 2015	MPWR	M	594	—	—	21,406 Direct	-2.70%	Disposed	(price as of 2026-08-20)
Oct. 30, 2015	MPWR	M	3,000	$12.28	$36,840	23,615 Direct	+14.55%	Acquired	10563.6% (price as of 2026-08-20)
Oct. 30, 2015	MPWR	S	3,000	$62.50	$187,500	20,615 Direct	-12.70%	Disposed	1995.2% (price as of 2026-08-20)
Oct. 30, 2015	MPWR	M	3,000	—	—	22,000 Direct	-12.00%	Disposed	(price as of 2026-08-20)
May 18, 2015	MPWR	M	2,000	$23.05	$46,100	22,615 Direct	+9.70%	Acquired	5581.1% (price as of 2026-08-20)
May 18, 2015	MPWR	S	2,000	$53.75	$107,500	20,615 Direct	-8.84%	Disposed	2336.3% (price as of 2026-08-20)
May 18, 2015	MPWR	M	705	$22.01	$15,517	21,320 Direct	+3.42%	Acquired	5849.5% (price as of 2026-08-20)
May 18, 2015	MPWR	S	705	$53.75	$37,894	20,615 Direct	-3.31%	Disposed	2336.3% (price as of 2026-08-20)
May 18, 2015	MPWR	M	705	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 18, 2015	MPWR	M	2,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 14, 2015	MPWR	M	3,000	$23.05	$69,150	23,615 Direct	+14.55%	Acquired	5581.1% (price as of 2026-08-20)
May 14, 2015	MPWR	S	3,000	$52.90	$158,700	20,615 Direct	-12.70%	Disposed	2375.4% (price as of 2026-08-20)
May 14, 2015	MPWR	M	3,000	—	—	2,000 Direct	-60.00%	Disposed	(price as of 2026-08-20)
Feb. 24, 2015	MPWR	M	5,000	$23.05	$115,250	25,615 Direct	+24.25%	Acquired	5581.1% (price as of 2026-08-20)
Feb. 24, 2015	MPWR	S	5,000	$52.50	$262,500	20,615 Direct	-19.52%	Disposed	2394.3% (price as of 2026-08-20)
Feb. 24, 2015	MPWR	M	5,000	—	—	5,000 Direct	-50.00%	Disposed	(price as of 2026-08-20)
Feb. 13, 2015	MPWR	M	5,000	$23.05	$115,250	25,615 Direct	+24.25%	Acquired	5581.1% (price as of 2026-08-20)
Feb. 13, 2015	MPWR	S	5,000	$50.25	$251,250	20,615 Direct	-19.52%	Disposed	2505.9% (price as of 2026-08-20)
Feb. 13, 2015	MPWR	M	5,000	—	—	10,000 Direct	-33.33%	Disposed	(price as of 2026-08-20)
Feb. 9, 2015	MPWR	A	2,533	—	—	20,615 Direct	+14.01%	Acquired	(price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	5,000	$16.20	$81,000	23,082 Direct	+27.65%	Acquired	7983.2% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	S	5,000	$35.07	$175,350	18,082 Direct	-21.66%	Disposed	3633.9% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	5,000	$16.20	$81,000	23,082 Direct	+27.65%	Acquired	7983.2% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	S	5,000	$35.11	$175,550	18,082 Direct	-21.66%	Disposed	3629.7% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	5,000	$16.20	$81,000	23,082 Direct	+27.65%	Acquired	7983.2% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	S	5,000	$35.07	$175,350	18,082 Direct	-21.66%	Disposed	3633.9% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	705	$16.20	$11,421	18,787 Direct	+3.90%	Acquired	7983.2% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	S	705	$35.07	$24,724	18,082 Direct	-3.75%	Disposed	3633.9% (price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	705	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	5,000	—	—	10,000 Direct	-33.33%	Disposed	(price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	5,000	—	—	5,000 Direct	-50.00%	Disposed	(price as of 2026-08-20)
Feb. 14, 2014	MPWR	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 11, 2014	MPWR	A	3,493	—	—	18,082 Direct	+23.94%	Acquired	(price as of 2026-08-20)
May 30, 2013	MPWR	M	5,705	$9.24	$52,714	20,294 Direct	+39.10%	Acquired	14071.9% (price as of 2026-08-20)
May 30, 2013	MPWR	S	5,705	$24.50	$139,772	14,589 Direct	-28.11%	Disposed	5244.8% (price as of 2026-08-20)
May 30, 2013	MPWR	M	5,705	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 29, 2013	MPWR	M	5,000	$9.24	$46,200	19,589 Direct	+34.27%	Acquired	14071.9% (price as of 2026-08-20)
May 29, 2013	MPWR	S	5,000	$24.35	$121,750	14,589 Direct	-25.52%	Disposed	5277.8% (price as of 2026-08-20)
May 29, 2013	MPWR	M	5,000	—	—	5,705 Direct	-46.71%	Disposed	(price as of 2026-08-20)
Feb. 28, 2013	MPWR	M	5,000	$9.24	$46,200	19,589 Direct	+34.27%	Acquired	14071.9% (price as of 2026-08-20)
Feb. 28, 2013	MPWR	S	5,000	$24.75	$123,750	14,589 Direct	-25.52%	Disposed	5190.8% (price as of 2026-08-20)
Feb. 28, 2013	MPWR	M	5,000	—	—	10,000 Direct	-33.33%	Disposed	(price as of 2026-08-20)
Feb. 28, 2013	MPWR	A	705	$9.24	$6,514	10,705 Direct	+7.05%	Acquired	14071.9% (price as of 2026-08-20)
Feb. 28, 2013	MPWR	A	1,176	$12.28	$14,441	1,176 Direct	—	Acquired	10563.6% (price as of 2026-08-20)
Feb. 28, 2013	MPWR	A	705	$16.20	$11,421	705 Direct	—	Acquired	7983.2% (price as of 2026-08-20)

Showing latest 100 of 119 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 27, 2016	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (0)	$20.20	Feb. 9, 2017	4,000	Disposed
May 26, 2016	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$20.20	Feb. 9, 2017	5,000	Disposed
May 26, 2016	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (357)	$20.20	Feb. 9, 2017	357	Disposed
May 23, 2016	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$20.20	Feb. 9, 2017	5,000	Disposed
May 23, 2016	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$20.20	Feb. 9, 2017	5,000	Disposed
Nov. 24, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (1,176)	$12.28	Feb. 18, 2017	1,176	Disposed
Nov. 24, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (1,406)	$12.86	Feb. 18, 2016	1,406	Disposed
Nov. 6, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$12.86	Feb. 18, 2016	5,000	Disposed
Nov. 6, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$12.86	Feb. 18, 2016	5,000	Disposed
Nov. 5, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$12.86	Feb. 18, 2016	5,000	Disposed
Nov. 5, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$12.86	Feb. 18, 2016	5,000	Disposed
Nov. 2, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (594)	$12.86	Feb. 18, 2016	594	Disposed
Oct. 30, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (3,000)	$12.86	Feb. 18, 2016	3,000	Disposed
May 18, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (705)	$22.01	May 22, 2015	705	Disposed
May 18, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (2,000)	$23.05	May 22, 2015	2,000	Disposed
May 14, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (3,000)	$23.05	May 22, 2015	3,000	Disposed
Feb. 24, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$23.05	May 22, 2015	5,000	Disposed
Feb. 13, 2015	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (0)	$23.05	May 22, 2015	5,000	Disposed
Feb. 14, 2014	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (705)	$16.20	May 24, 2014	705	Disposed
Feb. 14, 2014	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	—	May 24, 2014	5,000	Disposed
Feb. 14, 2014	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	—	May 24, 2014	5,000	Disposed
Feb. 14, 2014	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	—	May 24, 2014	5,000	Disposed
May 30, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,705)	$9.24	Sept. 14, 2013	5,705	Disposed
May 29, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$9.24	Sept. 14, 2013	5,000	Disposed
Feb. 28, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$9.24	Sept. 14, 2013	5,000	Disposed
Feb. 28, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (705)	$9.24	Sept. 14, 2013	705	Acquired
Feb. 28, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (1,176)	$12.28	Feb. 18, 2017	1,176	Acquired
Feb. 28, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (705)	$16.20	May 24, 2014	705	Acquired
Feb. 28, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (1,176)	$19.29	Feb. 2, 2017	1,176	Acquired
Feb. 28, 2013	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (705)	$22.01	May 22, 2015	705	Acquired
Nov. 30, 2012	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$9.68	Sept. 14, 2013	5,000	Disposed
Nov. 29, 2012	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$9.68	Sept. 14, 2013	5,000	Disposed
Nov. 29, 2012	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (5,000)	$9.68	Sept. 14, 2013	5,000	Disposed
Feb. 9, 2010	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (25,000)	$20.20	Feb. 9, 2017	25,000	Acquired
Feb. 18, 2009	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (25,000)	$12.86	Feb. 18, 2016	25,000	Acquired
May 22, 2008	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (15,000)	$23.05	May 22, 2015	15,000	Acquired
May 24, 2007	MPWR	Non-Qualified Stock Option (right to buy)	Common Stock (15,000)	$16.97	May 24, 2014	15,000	Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Sept. 15, 2006	MPWR	Non-Qualified Stock Option (right to buy) [F1]→ Common Stock (30,000)	30,000	Direct