SEI Investments Co

SEC CIK: 0000350894
Latest filing: Aug 14, 2026

SEC filings (opens in a new tab)

MPWR holding history

Monolithic Power Systems, Inc. in every 13F filed by SEI Investments Co, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

MPWR overview All 13F holders of MPWR Full Q2 2026 holdings

Shares (Q2 2026): 147,966
Value: $204.5M
% of portfolio: 0.2%
Quarters held: 22; Since Q1 2021

Holdings of MPWR by SEI Investments Co, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	147,966	$204.5M	0.2%	−7,325−4.7%	Reduced	Holders
Q1 2026	155,291	$169.8M	0.2%	−11,402−6.8%	Reduced	Holders
Q4 2025	166,693	$151.1M	0.1%	−32,993−16.5%	Reduced	Holders
Q3 2025	199,686	$183.8M	0.2%	+199+0.1%	Added	Holders
Q2 2025	199,487	$145.9M	0.2%	−957−0.5%	Reduced	Holders
Q1 2025	200,444	$116.3M	0.1%	+2,028+1.0%	Added	Holders
Q4 2024	198,416	$117.4M	0.2%	+1,300+0.7%	Added	Holders
Q3 2024	197,116	$182.2M	0.2%	−13,353−6.3%	Reduced	Holders
Q2 2024	210,469	$172.9M	0.2%	−41,556−16.5%	Reduced	Holders
Q1 2024	252,025	$170.7M	0.3%	−13,308−5.0%	Reduced	Holders
Q4 2023	265,333	$167.4M	0.3%	−21,895−7.6%	Reduced	Holders
Q3 2023	287,228	$132.7M	0.2%	+1,900+0.7%	Added	Holders
Q2 2023	285,328	$154.1M	0.3%	+47,402+19.9%	Added	Holders
Q1 2023	237,926	$119.1M	0.2%	+20,965+9.7%	Added	Holders
Q4 2022	216,961	$76.7M	0.2%	+12,153+5.9%	Added	Holders
Q3 2022	204,808	$74.4M	0.2%	+4,458+2.2%	Added	Holders
Q2 2022	200,350	$76.9M	0.2%	+32,039+19.0%	Added	Holders
Q1 2022	168,311	$81.7M	0.2%	+12,995+8.4%	Added	Holders
Q4 2021	155,316	$76.6M	0.1%	+8,920+6.1%	Added	Holders
Q3 2021	146,396	$70.9M	0.1%	+100,432+218.5%	Added	Holders
Q2 2021	45,964	$17.1M	<0.1%	−10,820−19.1%	Reduced	Holders
Q1 2021	56,784	$20.2M	0.1%	–	–	Holders

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.