Rafferty Asset Management, LLC

SEC CIK: 0001389426
Latest filing: Aug 14, 2026

SEC filings (opens in a new tab)

MPWR holding history

Monolithic Power Systems, Inc. in every 13F filed by Rafferty Asset Management, LLC, 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): 459,278
Value: $634.9M
% of portfolio: 1.4%
Quarters held: 22; Since Q1 2021

Holdings of MPWR by Rafferty Asset Management, LLC, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	459,278	$634.9M	1.4%	+141,805+44.7%	Added	Holders
Q1 2026	317,473	$347.1M	1.4%	−78,991−19.9%	Reduced	Holders
Q4 2025	396,464	$359.3M	1.2%	+17,146+4.5%	Added	Holders
Q3 2025	379,318	$349.2M	1.1%	−149,806−28.3%	Reduced	Holders
Q2 2025	529,124	$387.0M	1.3%	+140,269+36.1%	Added	Holders
Q1 2025	388,855	$225.5M	1.0%	−30,340−7.2%	Reduced	Holders
Q4 2024	419,195	$248.0M	0.9%	+28,126+7.2%	Added	Holders
Q3 2024	391,069	$361.5M	1.2%	−4,217−1.1%	Reduced	Holders
Q2 2024	395,286	$324.8M	1.2%	−30,272−7.1%	Reduced	Holders
Q1 2024	425,558	$288.3M	1.1%	+120,606+39.5%	Added	Holders
Q4 2023	304,952	$192.4M	0.8%	+41,387+15.7%	Added	Holders
Q3 2023	263,565	$121.8M	0.7%	−14,035−5.1%	Reduced	Holders
Q2 2023	277,600	$150.0M	0.8%	+64,533+30.3%	Added	Holders
Q1 2023	213,067	$106.6M	0.7%	+31,655+17.4%	Added	Holders
Q4 2022	181,412	$64.1M	0.5%	+20,406+12.7%	Added	Holders
Q3 2022	161,006	$58.5M	0.6%	−5,376−3.2%	Reduced	Holders
Q2 2022	166,382	$63.9M	0.6%	−32,775−16.5%	Reduced	Holders
Q1 2022	199,157	$96.7M	0.6%	+36,998+22.8%	Added	Holders
Q4 2021	162,159	$80.0M	0.4%	+52,691+48.1%	Added	Holders
Q3 2021	109,468	$53.1M	0.4%	−36,384−24.9%	Reduced	Holders
Q2 2021	145,852	$54.5M	0.3%	+18,195+14.3%	Added	Holders
Q1 2021	127,657	$45.1M	0.3%	–	–	Holders

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