--- title: Monolithic Power Founder Hsing Sells $59.3M in MPWR type: news slug: monolithic-power-hsing-may-2026-59m-block-sale canonical_url: https://13finsight.com/news/monolithic-power-hsing-may-2026-59m-block-sale published_at: 2026-05-25T13:33:54.755Z updated_at: 2026-05-25T13:33:58.030Z author: Alex Rivera author_title: Breaking News Editor author_url: https://13finsight.com/authors/alex-rivera word_count: 793 locale: en source: 13F Insight --- # Monolithic Power Founder Hsing Sells $59.3M in MPWR > Monolithic Power founder-CEO Michael Hsing sold $59.3 million of stock in a single session on May 18, 2026 under a 10b5-1 plan, cashing in on the AI power-chip rally near $1,500 a share. Michael Hsing, who founded Monolithic Power Systems (MPWR) in 1997 and still runs it as CEO, sold 40,000 shares for $59.3 million in a single trading session on May 18, 2026, according to a Form 4 filing (accession 0001214659-26-006625). The block was filled across 13 transactions at prices ranging from about $1,462 to $1,521 a share — a snapshot of just how far the analog and power-semiconductor maker has ridden the AI data-center buildout. The sale was not a discretionary call. It executed under a Rule 10b5-1 trading plan, the pre-scheduled mechanism that lets insiders sell during open windows without acting on inside information. That is the critical context: a founder cashing $59 million in one day looks dramatic, but the plan-driven structure means the timing was set in advance, not a reaction to anything happening at the company right now. It also barely dents his position. After the sale, Hsing directly held roughly 848,000 shares — a stake worth well over $1.2 billion at the day's prices. For a CEO who took just $59 million off a multi-billion-dollar holding, this reads as routine diversification of an extraordinarily concentrated personal balance sheet, not a vote against the business. Hsing's full Form 4 history shows he received a 136,825-share equity award in February 2026, so the May sale partially recycles fresh compensation. Selling into the AI power-chip boom The $1,500 share price is the story behind the story. Monolithic Power designs the power-management chips that regulate voltage inside servers, networking gear and increasingly the GPU-dense racks that train AI models. As spending on US cloud data centers surged, MPWR became one of the quieter beneficiaries of the same wave lifting Nvidia — and its stock followed, pushing toward four-figure territory that made even a 40,000-share sale a nine-figure event. That valuation is also the subject of active debate. AI-exposed semiconductor names trade at rich multiples, and insider selling into strength is exactly what investors watch for signs of a top. The 10b5-1 framing tempers that read here: the plan would have sold regardless of where the stock traded on May 18. The single-day concentration of the trade, rather than a drip across the month, simply reflects how the plan scheduled this particular tranche. An institutional base built on index funds Monolithic Power's shareholder register is dominated by passive money. The largest holders — BlackRock, Vanguard, State Street and Geode funds — own MPWR primarily because it sits in major indexes, not because of an active conviction call. Among genuinely active managers, Fidelity (FMR) and Franklin Resources hold notable stakes. The distinction matters when interpreting ownership: index inclusion drives most of the float, so the founder's own holding remains the most meaningful insider signal. How it compares across analog and power peers MPWR competes in a profitable corner of the chip industry alongside Analog Devices, Texas Instruments and ON Semiconductor — analog and power specialists whose insiders also sell systematically during rallies. Against that group, a founder-CEO trimming a sliver of a long-held position through a pre-set plan is unremarkable; what stands out is simply the absolute dollar size, a function of MPWR's $1,500 price tag rather than any unusual urgency. What to watch next The 10b5-1 plan governing the May sale remains the mechanism to track — any further tranches will appear in new Form 4 filings within two business days of execution. The substantive catalyst is Monolithic Power's next quarterly report, expected in late July or early August 2026, which will show whether AI-driven data-center demand is still accelerating enough to justify the multiple. A real signal would require Hsing adopting a markedly larger plan or selling outside the established cadence; absent that, Hsing's insider activity reads as routine wealth management. Follow each filing and the full institutional base on the Monolithic Power stock page. FAQ How much Monolithic Power stock did Michael Hsing sell in May 2026? Michael Hsing sold 40,000 Monolithic Power (MPWR) shares for $59.3 million on May 18, 2026, across 13 transactions at prices ranging from about $1,462 to $1,521 per share. Was Michael Hsing's MPWR sale a 10b5-1 plan sale? Yes. The May 18, 2026 sale was executed under a Rule 10b5-1 trading plan, which pre-schedules trades during open windows so they cannot be timed on material non-public information. How many Monolithic Power shares does Michael Hsing still own? Hsing directly held roughly 848,000 MPWR shares after the May 2026 sale, a stake worth well over $1.2 billion at the month's prices, keeping the founder heavily invested. Why is Monolithic Power stock so expensive per share? Monolithic Power trades near $1,500 a share because it has never split its stock while benefiting from the AI data-center buildout, where its power-management chips regulate voltage in servers and GPU racks. ## FAQ ### How much Monolithic Power stock did Michael Hsing sell in May 2026? Michael Hsing sold 40,000 Monolithic Power (MPWR) shares for $59.3 million on May 18, 2026, across 13 transactions at prices ranging from about $1,462 to $1,521 per share. ### Was Michael Hsing's MPWR sale a 10b5-1 plan sale? Yes. The May 18, 2026 sale was executed under a Rule 10b5-1 trading plan, which pre-schedules trades during open windows so they cannot be timed on material non-public information. ### How many Monolithic Power shares does Michael Hsing still own? Hsing directly held roughly 848,000 MPWR shares after the May 2026 sale, a stake worth well over $1.2 billion at the month's prices, keeping the founder heavily invested. ### Why is Monolithic Power stock so expensive per share? Monolithic Power trades near $1,500 a share because it has never split its stock while benefiting from the AI data-center buildout, where its power-management chips regulate voltage in servers and GPU racks. --- Source: 13F Insight — https://13finsight.com/news/monolithic-power-hsing-may-2026-59m-block-sale Author: Alex Rivera — https://13finsight.com/authors/alex-rivera Last updated: 2026-05-25T13:33:58.030Z