MPWR — MONOLITHIC POWER SYSTEMS, INC.Today's name, from the SEC's present-day ticker list — a present-day mapping, not the name as of each filing.

Congress trades
14
all time
Members · 12m
2
3 buys · 2 sells · by trade date
Latest filing
08-05
2026-08-05
Rows filed past the STOCK Act's 45-day window, stated on the row, never editorialised; both dates and the receipt stay on every row.
2
13F holders
841
top 500 listed · 2026-03-31
Congress: statutory ranges, filed up to 45 days after the trade · 13F: quarter-end snapshots, filed up to 45 days lateras of 2026-10-29
Congress 14Institutional 500

Congress · disclosure timeline

By trade date · 24 months · 8 rows ▲ buy, ▼ sell; height = lower bound (log scale). Trade date, not filing date — the filing lag is in the table below.

8 dated disclosures in the window, placed by trade date; magnitudes are the disclosed lower bounds, against gridlines at $15K, $250K, $5M.

Members active in MPWR

12 months · most active first Rows = number of disclosures, not dollars. Net = lower bound of the net range. Committees as of each member's latest trade in the window (roster snapshot 2026-10-29).
Members disclosing MPWR in the trailing 12 months
MemberRowsNet disclosed flow for this ticker: purchases minus sales, computed as a net range on the disclosed amounts. A lower bound is provable, never a point.Number of committees the member sat on as of their latest trade date in the window, from the cc0-legislators roster snapshot. Context, never an allegation; jurisdiction overlap needs the sector join.
Markwayne Mullin R–OK3$45.0K to $150K—
Byron Donalds R–FL-192−$30.0K to −$2.0K2

2 members

Congressional disclosures

Newest filed firstAll 14 rows ↗
Latest congressional filings mentioning MPWR
FiledMemberSide · OwnerTraded · LagAmountRange · FlagsSrc
2026-08-05Tommy Tuberville R–ALSELL JT (jointly owned)Traded 2024-05-03 LATE·824d$1K–$15Kamendment pending
2026-07-15Byron Donalds R–FL-19SELL partial (partial sale)Traded 06-05 +40d$1K–$15K
2026-07-15Byron Donalds R–FL-19SELL partial · SP (partial sale, spouse-owned)Traded 06-05 +40d$1K–$15K
2026-03-02Markwayne Mullin R–OKBUY JT (jointly owned)Traded 02-04 +26d$15K–$50K
2026-02-04Markwayne Mullin R–OKBUY SP (spouse-owned)Traded 01-05 +30d$15K–$50K
2026-02-04Markwayne Mullin R–OKBUYTraded 01-05 +30d$15K–$50K
2025-11-19Michael Guest R–MS-3BUY DC (dependent-child-owned)Traded 10-20 +30d$1K–$15K
2025-05-08Robert P. Bresnahan, Jr. R–PA-8BUYTraded 04-08 +30d$1K–$15K
2025-02-13Robert P. Bresnahan, Jr. R–PA-8SELL JT (jointly owned)Traded 01-13 +31d$1K–$15K
2023-11-16Tommy Tuberville R–ALBUY JT (jointly owned)Traded 10-17 +30d$1K–$15K

13F holders · Quarter ended 2026-03-31Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt. · longs only

Top institutional holders of MPWR for quarter 2026-03-31, 1–25 of 841 holders
#FilerValueSecuritiesFlagsderived by Public Filings from this build's reviewed ticker-mapping holders list for this share class; that list carries each holder's share count, share change and filed date, which this table does not show, but no document links — the EDGAR link opens the filer's 13F list·§
1BlackRock, Inc.$6.6B1
derived ·§ EDGAR ↗
2FMR LLC$4.8B1
derived ·§ EDGAR ↗
3VANGUARD CAPITAL MANAGEMENT LLC$3.4B1
derived ·§ EDGAR ↗
4VANGUARD PORTFOLIO MANAGEMENT LLC$2.8B1
derived ·§ EDGAR ↗
5STATE STREET CORP$2.4B1
derived ·§ EDGAR ↗
6Invesco Ltd.$1.6B1
derived ·§ EDGAR ↗
7FRANKLIN RESOURCES INC$1.0B1
derived ·§ EDGAR ↗
8MORGAN STANLEY$718M1
derived ·§ EDGAR ↗
9FIRST TRUST ADVISORS LP$647M1
derived ·§ EDGAR ↗
10MASSACHUSETTS FINANCIAL SERVICES CO /MA/$621M1
derived ·§ EDGAR ↗
11BARCLAYS PLC$608M1
derived ·§ EDGAR ↗
12UBS Group AG$591M1
derived ·§ EDGAR ↗
13NORTHERN TRUST CORP$535M1
derived ·§ EDGAR ↗
14ROYAL BANK OF CANADA$518M1
derived ·§ EDGAR ↗
15VOYA INVESTMENT MANAGEMENT LLC$430M1
derived ·§ EDGAR ↗
16BANK OF AMERICA CORP /DE/$418M1
derived ·§ EDGAR ↗
17Legal & General Group Plc$416M1
derived ·§ EDGAR ↗
18BROWN ADVISORY INC$415M1
derived ·§ EDGAR ↗
19CHARLES SCHWAB INVESTMENT MANAGEMENT INC$412M1
derived ·§ EDGAR ↗
20CITIGROUP INC$373M1
derived ·§ EDGAR ↗
21Rafferty Asset Management, LLC$347M1
derived ·§ EDGAR ↗
22UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$330M1
derived ·§ EDGAR ↗
23VANGUARD FIDUCIARY TRUST CO$304M1
derived ·§ EDGAR ↗
24WELLINGTON MANAGEMENT GROUP LLP$274M1
derived ·§ EDGAR ↗
25Anther Capital Ltd$255M1
derived ·§ EDGAR ↗
Show the top 500 of 841 holders
Truncated by Public Filings. Top 500 of 841 holders shown; the rest are on EDGAR. Method ↗

Crowding — not available in this build. No holder rows for the selected period, so no percentile can be ranked.

Congress ↔ notable managers · MPWR

Congress · last 90 days

Buyers
0 — —
Sellers
1 Tommy Tuberville R–AL $1K–$15K

filed 2026-07-31 → 2026-10-29 · statutory ranges

Notable managers · quarter ended 2026-03-31

Trimming
1 Moore Capital Management $0 held

by shares · $ = value heldNEW + ADD vs TRIM + EXIT, by share count. $ = reported value now, not the change. · MONOLITHIC PWR SYS INC

Merged timeline of congressional filings and notable-manager moves on MPWR
DateWhoChangeSize
2026-08-05Tommy Tuberville CongressSELL$1K–$15K
2026-05-15Gotham Asset Management 13FADD+2,321 sh
2026-05-15Bridgewater Associates 13FADD+9,071 sh
2026-05-15Moore Capital Management 13FEXIT−17,080 sh

4 newest, by filing date · 13F rows are quarter-end snapshots, not trades

Congress vs filers

12 months
Congress net (rows)3 buy / 2 sell
Congress net ($ bound)$15.0K to $148K
Filersnot computedThe filer side needs per-issuer quarter-over-quarter actions, which the published aggregate does not carry for this issuer. Convergence and divergence are stated only when both sides are computed.