UMC posts first-quarter results on April 29 after a sharp month-long rally that has left short sellers in retreat and options traders leaning more bullish than at any point this year.
The stock climbed 36% over the past month to close at $12.28 on Friday. That surge has coincided with a pullback in short positioning — shares short fell 2.3% over the past week to 30.0 million, reversing a brief spike in early April when the short book had swelled above 34 million shares. Cost to borrow dropped 20% week-on-week to 1.18%, suggesting renewed availability as some bearish bets unwind. Utilisation sits at 47%, well off the 100% reading hit within the past year, a sign that the squeeze dynamic that characterized earlier months has largely dissipated.
Options positioning reflects the turn in sentiment. The put/call ratio has slid to 0.19, more than a standard deviation below its recent average and near the lowest level of the past year. That shift signals traders are buying calls at a faster pace than puts heading into the print — a notably optimistic posture for a stock that has stumbled after its last two earnings events. In February the shares fell 6% the day after results and closed down 10% within a week. January's report triggered a steeper 15% one-day drop and a 20% decline over five sessions. Whether the recent rally has already priced in good news or set the stage for another disappointment is the open question.
The debate around UMC has tilted decidedly negative among major analysts over the past 18 months. Goldman downgraded to Neutral in October 2024 with a $7.40 target — a figure now sitting 40% below the current price, underscoring how far the stock has run ahead of Wall Street's outdated expectations. Morgan Stanley, JPMorgan, and Citigroup all cut ratings between late 2024 and early 2025, collectively souring on the foundry sector's margin outlook. The most recent consensus target on file is $7.80, struck back in October 2023 and no longer reflective of current positioning. Bulls will point to factor scores that rank the stock in the 99th percentile on analyst recommendation divergence and in the 84th percentile within its sector — a sign the company may be better-positioned than the stale Street view suggests. Bears counter that valuation has expanded sharply, with the price-to-book ratio jumping 66 basis points over the past month to 2.33 and the P/E climbing more than five turns to 19.7.
Institutional activity offers some support for the rally. BlackRock added 22 million shares in the first quarter while Vanguard increased its stake by 11.5 million. Norges Bank moved the other way, trimming its position by more than 23 million shares late last year. The earnings call will test whether demand visibility and pricing discipline can justify the recent move — or whether the pattern of post-earnings sell-offs reasserts itself.
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