Monolithic Power rose nearly 17% the day a jury let Reed Semiconductor compete for its AI sockets

A Delaware jury decided on November 9 that Reed Semiconductor did not infringe either of the two patents Monolithic Power Systems·−1.65% — Monolithic Power Systems, down 1.65 percent as of its last quote had asserted against it, and with that one of the legal fences around the fastest-growing corner of AI silicon came down ¹. Reuters reported the verdict↗ the same day ². Reed's chief executive, Wenkai Wu, aimed his victory statement↗ straight at "the investment community," and he picked the right audience ¹.

Monolithic Power collects no damages from a case it brought, and its stock still closed at $1,382.34 that day, a fifth gain in seven sessions ³. The market paid for the demand and said nothing about the moat.

The same silicon, the same racks

Reed is a private, fabless chip designer in Warwick, Rhode Island, and its catalog is the same plumbing Monolithic Power sells: the eFuses, bus converters and multiphase controllers that step 48-volt rack power down to the low-voltage rails an AI accelerator actually runs on ⁴. Reed markets its line as power "from Vin to Vcore" ⁴.

The jury's finding of no infringement means a data-center buyer can now qualify Reed's parts for an AI power socket with no infringement cloud over them ¹. An appeal is possible; it would not restore that cloud for years, and Reed has an infringement suit of its own pending against Monolithic Power ¹.

The growth is real; the price is for the moat

Monolithic Power's September quarter, filed days before the verdict↗, shows the demand: revenue reached $1.2 billion ⁵. Enterprise data, its AI and server power business, grew 165 percent in the quarter ⁵ and now supplies 42 percent of sales ⁵. Gross margin has sat near 55 percent for three years ⁶.

At 76.6 times trailing earnings, against a five-year median of 66.5, the price assumes that margin holds while revenue keeps compounding ³. A patent fence that a jury found does not stop the nearest competitor was part of that assumption. Insiders sold $724.5 million of stock over the past twelve months and bought none ³. Monolithic Power's own 10-Q, for what it is worth, never names the Reed case in its legal-proceedings note ⁵.

Reed earned the right to compete

While defending, Reed also won a January ruling in which a patent-office tribunal invalidated all challenged claims of a Monolithic Power patent, and it closed an oversubscribed $100 million funding round with global semiconductor companies as investors ¹.

That is the reward side of this story: a smaller builder spent years of its own money keeping the right to compete, and came out with capital and a clean catalog. For the AI buildout the outcome is right, too. Power delivery is a genuine bottleneck in every rack, and sockets awarded on merit build cheaper data centers than sockets awarded in court.

Nothing in the verdict takes a dollar of Monolithic Power's revenue. What it takes is the assumption that no one else was allowed to compete for it.