UMC Shorts Retreat as Options Signal Calm Before Tuesday's Print

UMC enters Tuesday's earnings release having shed roughly 27% of its market value over the past month, yet the short-selling community has been moving in the opposite direction, cutting positions rather than pressing them.

Short interest has dropped 40% over the past month and fell a further 8% in a single session on October 22. Borrow demand has collapsed alongside it: the cost to borrow is now 0.69%, down from above 1% for most of October, and borrow availability has loosened to 164%, meaning there are more than one and a half shares available to lend for every share already borrowed. That is a long way from the 52-week trough of 0.12% availability, when the lending pool was effectively empty. The short score has also drifted lower, to 44.1 from 48.6 ten days ago, consistent with a market that sees less reason to be aggressively short into the print.

Options traders are reading the situation similarly. The put/call ratio is 0.36, modestly below its 20-day average of 0.40 and well under the 52-week high of 0.92 reached earlier in the year. There is no sign of elevated hedging demand, which is notable given a stock that has lost more than a quarter of its value in a month. Calls are outpacing puts slightly, a tilt toward optionality on any recovery rather than protection against further declines.

The debate around UMC centres on when the foundry cycle turns. The company reported a 7.2% sequential revenue decline in Q2 as inventory corrections spread across chipmakers, and acknowledged extended weakness in mature-node orders. On the bullish side, UMC's EPS surprise factor ranks in the 89th percentile, meaning it has a strong record of clearing the bar analysts set for it. On the bearish side, the 12-month forward EPS growth score ranks in just the 10th percentile, pointing to a consensus that expects little near-term improvement. Macquarie reinstated coverage in July with an Outperform rating, providing a recent counterweight to a wave of downgrades from JPMorgan, Morgan Stanley, Goldman Sachs and Citigroup that ran through late 2024 into early 2025. Price target data from those earlier actions is stale relative to today's price of $18.89 and should not be leaned on for context.

One ownership detail worth noting: CFO Liu Chitung sold shares on three separate occasions between July and September, offloading a combined 3.5 million shares for roughly $523 million in proceeds. Those were open-market transactions, not pre-arranged 10b5-1 plan sales, which gives them more weight as a signal than routine exercise-and-sell activity. Net insider selling across the 90-day window totalled $526 million. BlackRock, the largest institutional holder, added 20 million shares in the quarter to September 30 and now holds 7.75% of the company.

The print on October 28 will test whether the mature-node weakness that pressured Q2 has stabilised enough to revive the earnings growth trajectory that has consistently surprised to the upside, even as the cycle-level picture remains uncertain.