AI Stock UMC Sinks 10% on $1.8 Billion Worth of Extraordinarily Good News

United Microelectronics (UMC) shares are down about 10% today after the Taiwanese chip foundry priced a $1.8 billion convertible bond sale. It filed the terms with the SEC at 9:27 a.m. ET, just before Monday’s open. (The S&P 500 is up today, so this one is all UMC.)

UMC is selling two $900 million tranches of bonds. They pay no interest, and holders can swap them for new shares starting three months after the bonds are issued on Oct. 13

Here’s the fun part: if the bonds never convert, investors get back a little less than they paid. (The two tranches carry yields of -0.25% and -1.35% a year.) So UMC is getting paid to borrow.

Not much. UMC says that if every bond converts, existing shareholders get diluted by about 2.34%. And that only happens if the stock climbs past those conversion prices.

It would still be the first real increase in years, since UMC’s diluted share count has barely moved since 2022…

So why the 10% drop? It’s wiped out over $5 billion of market value, more than three times the size of the whole deal. Some of the drop is probably mechanical, though this is speculation: people who buy convertibles often short the stock to hedge, which can weigh on the shares on the day a deal prices.

The balance sheet doesn’t need rescuing, either, so it’s not like there’s extensive known financial risk here

UMC says the money will go toward machinery, equipment and building new plant facilities. That points to a bigger capital spending budget, which can weigh on free cash flow until the new capacity fills up.

Still, for me, the market’s reaction looks overdone. UMC is borrowing for free(ish), and new shares only get issued if the stock rises well above where it is today.

Of course, if the shares don’t rise, UMC owes $900 million back in April 2028 on the short tranche. UMC’s next earnings report should show how big the spending plan really is.

But in the meantime…this seems like a very silly move by the market to me. You want companies to lock in debt at a low cost of capital!

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