--- title: "Monolithic Power CEO Hsing Sells $59M MPWR Block at $1,500" type: news slug: monolithic-power-hsing-may-2026-59m-block-sale-record-high canonical_url: https://13finsight.com/news/monolithic-power-hsing-may-2026-59m-block-sale-record-high published_at: 2026-06-02T18:05:25.152Z updated_at: 2026-06-02T18:05:27.180Z author: Alex Rivera author_title: Breaking News Editor author_url: https://13finsight.com/authors/alex-rivera word_count: 1023 locale: en source: 13F Insight --- # Monolithic Power CEO Hsing Sells $59M MPWR Block at $1,500 > Monolithic Power founder-CEO Michael Hsing sold 40,000 shares for about $59 million in a single May 2026 session as the AI power-chip maker traded near record highs above $1,500. On May 18, 2026, Michael Hsing sold 40,000 shares of Monolithic Power Systems in a single session for about $59.3 million. The prices tell you why the sale drew attention: lots cleared between roughly $1,487 and $1,521 a share, putting one of the highest-priced stocks in the semiconductor sector near its all-time high just as its founder and chief executive took a nine-figure slice of money off the table. For a company whose entire investment case rests on supplying the power-management silicon inside AI servers, a founder selling into the top of the move is exactly the kind of signal investors scrutinize. But the texture of Hsing's selling argues against reading it as a loss of faith. This was a block sale, not a panic — and it fits a multi-year rhythm of large, roughly quarterly dispositions rather than a sudden change in behavior. He sold a comparable 40,000-share block in November 2025 and another in August 2025, each in the tens of millions of dollars. The May trade is the latest installment in a long, disciplined monetization program, not a break from it. The full sequence is visible in Hsing's Form 4 trading history. What he kept The headline sale is dwarfed by what remains. After the May 18 block, Hsing still directly held 848,263 MPWR shares per his latest Form 4 (accession 0001214659-26-006625) — a position worth roughly $1.27 billion at that week's prices. The SEC does not flag him as a 10% owner; Monolithic Power's largest reported stakes belong to institutions, led by index complexes Vanguard at 12.4% and BlackRock at 10.2% per their latest Schedule 13G filings. Hsing is among the company's largest individual holders, not its single largest shareholder — an important distinction, because his roughly 848,000 shares represent founder-scale conviction that survives every quarterly sale intact. Across the visible record, Hsing has sold about 1.22 million shares for roughly $561 million, and his career Monolithic Power sales total $749.5 million. As with most founder-CEOs of richly valued companies, the recurring block sales are best understood as diversification of a hyper-concentrated net worth, executed on a schedule, rather than a tactical call on the next quarter. Why the timing is loaded The reason this particular sale matters is the backdrop. Monolithic Power has become one of the cleanest pure-play beneficiaries of the AI buildout. The company posted record first-quarter 2026 revenue of $804 million, up 26% year over year and ahead of consensus, with its enterprise-data segment — the power solutions that regulate voltage for AI accelerators, servers, memory, and optical modules — the standout driver. Management raised its enterprise-data growth floor to 85% year over year on the strength of backlog visibility. That is the kind of guidance that takes a stock to $1,500 and keeps it there. Monolithic's fortunes are tied to the same demand wave lifting the broader AI-silicon complex. Its chips sit alongside the GPUs from Nvidia and the custom accelerators and networking silicon from Broadcom inside data-center racks, while it competes for the analog and power-management dollar against incumbents like Texas Instruments and Analog Devices. When the founder of a company at the center of that trade sells into record highs, the question is always whether he sees a top — but a years-long pattern of quarterly blocks at progressively higher prices points to a plan, not a forecast. How the holder base reads it The institutional register offers a useful counterweight to founder selling. Beyond the index giants, Fidelity's FMR holds an 8.3% stake per its February 2026 Schedule 13G — an actively managed position whose quarter-over-quarter direction is a cleaner read on professional conviction than the passive funds that own MPWR to match its benchmark weight. If active holders like Fidelity are adding while Hsing trims on schedule, the two flows offset and the message is benign; if active managers begin trimming alongside the founder, that is the configuration worth worrying about. The next round of 13F filings for the June quarter will settle it. What to watch next Three concrete markers stand out. First, whether Hsing's next block lands on the usual roughly quarterly cadence — based on the pattern, the next sizable sale would be expected around the August reporting window, and a deviation in size or timing would be the real signal. Second, the share price relative to the $1,487 to $1,521 band where the May block cleared: sustained trading above it validates the AI-power thesis, while a slip back below would put the founder's sale in a more cautious light. Third, the hard catalyst: Monolithic Power reports second-quarter 2026 results after the close on August 3, 2026, when the 85% enterprise-data growth floor gets its next test. Until then, the May sale reads as what the multi-year data shows — a founder converting a fraction of an enormous stake into cash on a schedule, with $1.27 billion still riding on the company he built. Any change will show first in Hsing's insider transaction record. FAQ Why is Monolithic Power CEO Michael Hsing selling MPWR stock? Hsing sold a 40,000-share block for about $59.3 million on May 18, 2026, consistent with a multi-year pattern of large roughly quarterly sales he also made in August and November 2025. The selling reflects diversification of a concentrated stake rather than a change in his view of the business. How many Monolithic Power shares does Hsing still own? After the May 18, 2026 block, Hsing directly held 848,263 MPWR shares per his latest Form 4, a stake worth roughly $1.27 billion near record prices. He is among the company's largest individual holders but is not flagged as a 10% owner. How much MPWR stock did Hsing sell in May 2026? Hsing sold 40,000 Monolithic Power shares for about $59.3 million in a single May 18, 2026 session at prices between roughly $1,487 and $1,521. His career MPWR sales total about $749.5 million. When does Monolithic Power report earnings? Monolithic Power reports second-quarter 2026 results after the U.S. market close on August 3, 2026. It posted record Q1 2026 revenue of $804 million, up 26% year over year, led by AI data-center demand. ## FAQ ### Why is Monolithic Power CEO Michael Hsing selling MPWR stock? Hsing sold a 40,000-share block for about $59.3 million on May 18, 2026, consistent with a multi-year pattern of large roughly quarterly sales he also made in August and November 2025. The selling reflects diversification of a concentrated stake rather than a change in his view of the business. ### How many Monolithic Power shares does Hsing still own? After the May 18, 2026 block, Hsing directly held 848,263 MPWR shares per his latest Form 4, a stake worth roughly $1.27 billion near record prices. He is among the company's largest individual holders but is not flagged as a 10% owner. ### How much MPWR stock did Hsing sell in May 2026? Hsing sold 40,000 Monolithic Power shares for about $59.3 million in a single May 18, 2026 session at prices between roughly $1,487 and $1,521. His career MPWR sales total about $749.5 million. ### When does Monolithic Power report earnings? Monolithic Power reports second-quarter 2026 results after the U.S. market close on August 3, 2026. It posted record Q1 2026 revenue of $804 million, up 26% year over year, led by AI data-center demand. --- Source: 13F Insight — https://13finsight.com/news/monolithic-power-hsing-may-2026-59m-block-sale-record-high Author: Alex Rivera — https://13finsight.com/authors/alex-rivera Last updated: 2026-06-02T18:05:27.180Z