MPWR Drops 10% as Shorts Exit and Street Stays Bullish

Short sellers, far from adding fuel, have been pulling back. Short interest fell nearly 10% in a single session on July 2, and is down 3% on the week to roughly 4.4% of the free float — a level that's middling rather than extreme. The borrow market is deeply relaxed: availability is running at over 3,000% of short interest, meaning shares are plentiful relative to the amount currently borrowed. Cost to borrow is just 0.45% annually, down 12% on the week and near the low end of its recent range. The ORTEX short score has drifted lower all week, from 40.8 on June 30 to 36.9 by July 2 — pointing to easing rather than building short-side conviction. Options are similarly unremarkable. The put/call ratio of 1.28 is almost exactly in line with its 20-day average, showing no particular rush for downside protection. Together, this positioning picture looks disengaged rather than bearish — shorts are trimming into price weakness, not loading up.

Where the tension sits is on the Street, which remains structurally bullish while the stock slides away from targets. The consensus is a buy, with the mean price target sitting around $1,789 — a 39% premium to the current price. The most recent wave of analyst upgrades came in early May, when firms including TD Cowen, Wells Fargo, and Keybanc all raised targets after earnings, with Keybanc going as high as $2,000. Those targets are now over two months old and look stretched against a stock that has since given back roughly $400. On fundamentals, the trailing PE near 53 and price-to-book near 15 are rich multiples for a stock in drawdown. The 30-day compression in both (PE down about 7 points, PB down nearly 2 points) shows the multiple has been contracting as the price drops, but not yet to levels that look cheap against the growth story. The bull case centres on MPWR's exposure to AI-driven power delivery in data centres and communications; the bear case flags inventory correction risk at distributors and the stock's continued dependence on a few high-growth segments to justify its valuation.

Insider activity in the past 90 days has been one-directional. CEO and founder Michael Hsing sold roughly $17 million worth of shares in a cluster of transactions on May 18, at prices between $1,468 and $1,513. General Counsel Saria Tseng added another $20 million in sales in late May. Net insider selling over the 90-day window totals over $106 million. These look like planned disposals rather than a panic exit — the trades were spread across multiple lots and priced well above where the stock sits today — but the one-way flow is worth noting as the price moves toward those execution levels.

Q2 earnings are due July 31. After the Q1 print in early May, the stock jumped 7% the next day and held most of that gain over the following week; the quarter before that produced a 2.5% decline. The next report is therefore the first real catalyst where the Street's elevated targets and insider-selling prices will be tested against actual results — and the degree to which data centre demand has held up through the quarter will likely determine whether the current gap between price and analyst consensus starts to close.