AI racks need 600,000 capacitors each, so Samsung Electro-Mechanics is rationing its phone book

Nvidia's Vera Rubin rack carries roughly 600,000 multilayer ceramic capacitors, about a third more than the GB200 and GB300 racks it replaces↗ ¹. AMD's MI450 validation took one board from 1,440 to 10,544 high-capacitance parts, up 632% ². An AI server holds more than ten times the MLCCs of a conventional server, and its high-capacitance parts fetch at least three times the price of mobile-grade capacitors ³⁴.

Samsung Electro-Mechanics is collecting. On 1 September it signed the largest MLCC supply deal in its history: 1.0722 trillion won, about $780 million, covering all of 2027↗ ⁴. Contracts since May went from 2.25 trillion won on 1 September to 3.32 trillion by the 20th, and final talks on roughly 700 billion more would push the pile past 4 trillion ³.

One book gets marked up

SEMCO's MLCC lines are running in the high-90s percent of capacity, effectively maxed ³. It lifted MLCC prices about 30% in August ⁵, and TrendForce reported the sharper instrument: consumer-grade parts up 25 to 30%, explicitly to curb orders and free capacity for high-end lines ⁶. Second-quarter operating profit rose 106.7% to 440.4 billion won↗ ⁵, third-quarter consensus has been marked up 28.12% to 602 billion ¹, and SEMCO's book-to-bill hit 1.31 at end-June, its highest since the pandemic ⁷.

The other gets marked down

On 27 September, with the iPhone Duo freshly on shelves, earnings forecasts for SEMCO, LG Display and LG Innotek were cut↗ as the dollar-won rate fell nearly 200 won in two months ⁸. Murata answered the same squeeze by walking away, reported halting selected part numbers across nine general-purpose and automotive series ⁶. SEMCO is trying the opposite: hold both books and ration the phone side with price. The phone book is not lost; it is priced out of the queue so AI racks can cut in line.

Shenzhen already shows the split working. Consumer capacitor spot prices there are down two-thirds from their peak, while high-capacitance AI-server parts have risen as much as fivefold over the past year ⁶.

The bet is holding both

Goldman Sachs sizes the AI-server MLCC market at $5.8 billion by 2030, up from $1.4 billion in 2025 ⁴, and industry observers count only SEMCO and Murata as realistically able to serve it↗ ⁹. SEMCO is doubling capital spending to 6 trillion won next year to try, reorganizing lines around AI-server and automotive parts rather than mobile ⁵. Murata chose which book to keep. SEMCO is paying to hold both.

Korean trading resumes after the Chuseok holiday with this week's moves barely priced ¹⁰, and the next two markers are the 700-billion-won signature that takes the pile past 4 trillion won ³ and a third-quarter print against a consensus marked up to 602 billion ¹.