Silicon Box's chiplet-packaging bet: a $2B Singapore fab, then a €3.2B Italian one

Runs advanced chiplet-integration fabs — packaging interconnects at sub-5-micron pitch for AI, auto and wearable chips.

That chiplet adoption is bottlenecked at the back end, and one company owning sub-5-micron interconnect fabs could become its standard foundry.

The $2B Singapore fab was built before its Series B closed; it raised $200M in January 2024 at a valuation above $1B.

Byung Joon Han spent decades in advanced packaging; Sehat Sutardja and Weili Dai co-founded Marvell, and Sutardja shipped an early commercial chiplet platform in 2015 — then hit a wall: no back-end infrastructure existed to scale it. The three reunited in 2021 to build that infrastructure in Singapore.

Ground broke in July 2022; the Tampines fab — 73,000 sq m, US$2B, up to 1,200 hires — opened on 2023-07-20 (Straits Times). In January 2024 a $200M Series B valued it above $1B. On 2024-03-11 the Italian industry minister announced a €3.2B fab for northern Italy, the company's first overseas plant (EE Times). On 2024-09-19 co-founder Sehat Sutardja died at 63 (Berkeley Engineering).

The bet targeted a real bottleneck: chiplet adoption stalls without back-end capacity designed for interconnecting dies, which commodity OSAT packaging was never built to provide.

Building the fab first inverted the usual risk order — it buys credibility and learning, but leaves the company carrying fixed costs ahead of committed demand.

Founding pedigree mattered: Marvell's co-founders brought both the technical claim and the investor access that let a startup open a $2B factory.

Government partners (Singapore's EDB, Italy's industry ministry) de-risked the capital intensity, treating the fabs as industrial policy as much as venture bets.

In hardware, the wedge can be a factory. Silicon Box skipped the fabless stage and bought the constraint itself — capacity nobody else offered — betting demand follows proof rather than preceding it.

As of September 2024, the Singapore fab is operating and hiring toward its 1,200-role target, the €3.2B Italian project is signed and in planning, and the company continues under CEO and co-founder Byung Joon Han following Sutardja's death.