Hsing Michael — SEC Form 4 filings
SEC reporting owner CIK 1308676. 30 Form 4 filings on record with FilingPulse; latest filed 2026-05-20.
Transaction summary — filings shown
Covers all 30 filings on record, filed 2024-01-09 to 2026-05-20. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 224 legs across 26 filings — 395,104 shares, $403,665,562 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 4.
- Largest priced transaction: sale of 54,923 shares @ $1,171.16 ($64,323,824) in MONOLITHIC POWER SYSTEMS INC, filed 2026-02-10.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| MONOLITHIC POWER SYSTEMS INC (MPWR) | CEO, Director | 30 | — | 224 legs · 395,104 sh · $403,665,562 | 4 |
Form 4 filings — Hsing Michael
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-05-20 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 3,424 @ $1,462.61 · Sale (S): 5,819 @ $1,467.62 · Sale (S): 5,049 @ $1,472.84 · Sale (S): 4,082 @ $1,476.96 · Sale (S): 5,737 @ $1,482.51 · Sale (S): 6,688 @ $1,486.76 · +7 more | EDGAR |
| 2026-02-17 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 12,731 @ $1,155.71 · Sale (S): 4,992 @ $1,159.84 · Sale (S): 4,001 @ $1,164.92 · Sale (S): 2,076 @ $1,168.80 · Sale (S): 200 @ $1,173.39 · Sale (S): 480 @ $1,180.79 · +6 more | EDGAR |
| 2026-02-13 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 363 @ $1,158.71 · Sale (S): 1,366 @ $1,163.71 · Sale (S): 1,533 @ $1,167.62 · Sale (S): 1,987 @ $1,172.92 · Sale (S): 2,799 @ $1,177.67 · Sale (S): 1,542 @ $1,182.82 · +4 more | EDGAR |
| 2026-02-12 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 4,302 @ $1,132.01 · Sale (S): 6,325 @ $1,136.75 · Sale (S): 16,080 @ $1,141.88 · Sale (S): 3,864 @ $1,145.90 · Sale (S): 1,215 @ $1,151.11 · Sale (S): 694 @ $1,154.96 · +3 more | EDGAR |
| 2026-02-10 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 54,923 @ $1,171.16 | EDGAR |
| 2026-02-05 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Grant/award (A): 136,825 @ $0 | EDGAR |
| 2025-12-11 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Gift (G): 12,337 @ $0 | EDGAR |
| 2025-11-13 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 80 @ $951.69 · Sale (S): 1,516 @ $952.62 · Sale (S): 2,927 @ $953.69 · Sale (S): 7,934 @ $954.61 · Sale (S): 4,056 @ $955.46 · Sale (S): 797 @ $956.50 · +11 more | EDGAR |
| 2025-11-13 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 403 @ $957.58 · Sale (S): 2,799 @ $958.34 · Sale (S): 440 @ $959.36 · Sale (S): 403 @ $960.45 · Sale (S): 1,904 @ $961.63 · Sale (S): 2,817 @ $962.61 · +13 more | EDGAR |
| 2025-10-31 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Tax withholding (F): 121,918 @ $1,096.63 | EDGAR |
| 2025-10-28 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Grant/award (A): 302,920 @ $0 | EDGAR |
| 2025-08-18 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 2,603 @ $825.69 · Sale (S): 2,555 @ $826.64 · Sale (S): 3,878 @ $827.72 · Sale (S): 396 @ $828.64 · Sale (S): 4,101 @ $829.45 · Sale (S): 2,100 @ $830.46 · +5 more | EDGAR |
| 2025-02-20 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 5,200 @ $700 | EDGAR |
| 2025-02-12 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 2,594 @ $717.10 | EDGAR |
| 2025-02-11 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 11,964 @ $700 | EDGAR |
| 2025-01-28 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 3,636 @ $700 | EDGAR |
| 2024-11-13 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 2,812 @ $765.15 | EDGAR |
| 2024-08-13 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 200 @ $813.23 · Sale (S): 65 @ $814.72 · Sale (S): 458 @ $815.37 · Sale (S): 300 @ $816.18 · Sale (S): 100 @ $817.10 · Sale (S): 100 @ $821.32 · +12 more | EDGAR |
| 2024-08-12 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 2,790 @ $778.39 | EDGAR |
| 2024-07-24 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 9,614 @ $831.58 | EDGAR |
| 2024-07-02 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 200 @ $794.69 · Sale (S): 100 @ $798.74 · Sale (S): 200 @ $800.62 · Sale (S): 100 @ $802.19 · Sale (S): 150 @ $804.18 · Sale (S): 1,820 @ $806.39 · +1 more | EDGAR |
| 2024-06-05 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 62 @ $714.56 · Sale (S): 190 @ $715.50 · Sale (S): 70 @ $716.84 · Sale (S): 228 @ $717.36 · Sale (S): 100 @ $719.04 · Sale (S): 166 @ $720.15 · +20 more | EDGAR |
| 2024-05-09 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 2,824 @ $690 | EDGAR |
| 2024-05-03 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 339 @ $652.81 · Sale (S): 251 @ $653.46 · Sale (S): 378 @ $654.23 · Sale (S): 217 @ $655.08 · Sale (S): 195 @ $658.90 · Sale (S): 1,000 @ $659.49 · +10 more | EDGAR |
| 2024-04-03 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 200 @ $670.56 · Sale (S): 206 @ $671.81 · Sale (S): 800 @ $672.45 · Sale (S): 1,114 @ $673.48 · Sale (S): 1,300 @ $674.57 · Sale (S): 680 @ $675.64 · +9 more | EDGAR |
| 2024-03-04 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 100 @ $716.82 · Sale (S): 100 @ $717.31 · Sale (S): 200 @ $718.52 · Sale (S): 825 @ $719.47 · Sale (S): 312 @ $720.27 · Sale (S): 441 @ $721.60 · +9 more | EDGAR |
| 2024-02-09 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 2,790 @ $680 | EDGAR |
| 2024-02-07 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 3,791 @ $641 | EDGAR |
| 2024-02-05 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 400 @ $594.81 · Sale (S): 200 @ $595.31 · Sale (S): 129 @ $597.77 · Sale (S): 855 @ $598.36 · Sale (S): 1,343 @ $599.60 · Sale (S): 430 @ $600.48 · +9 more | EDGAR |
| 2024-01-09 | 4 | MONOLITHIC POWER SYSTEMS INC (MPWR) | Sale (S): 102 @ $568.36 · Sale (S): 614 @ $569.92 · Sale (S): 2,051 @ $570.62 · Sale (S): 1,141 @ $571.65 · Sale (S): 1,522 @ $572.43 · Sale (S): 811 @ $573.52 · +4 more | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-09 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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