Kioxia has shed roughly two-thirds of its peak market value, Nikkei Asia reports, as new Chinese memory rivals start to muscle into the NAND flash business the Japanese company has helped anchor for a decade.

That's a brutal drawdown for a supplier that sits near the top of the global NAND market alongside its Western Digital-aligned joint venture fab operations in Yokkaichi and Kitakami. The number itself — two-thirds of peak value, gone — is the story. The cause, per Nikkei Asia's reporting, is the arrival of Chinese chip competitors on Kioxia's core turf.

How much value has Kioxia lost?

The Nikkei Asia figure is stark: about 66% of the company's peak market capitalization has evaporated. Kioxia, formerly Toshiba Memory, has ridden the NAND cycle through brutal supply gluts and short, sharp recoveries since its 2018 sale and subsequent 2024 relisting on the Tokyo Stock Exchange. A peak-to-trough collapse of this magnitude puts the stock back in territory that raises questions about how investors price a memory maker whose pricing power is now contested from a new direction.

Two-thirds is not a routine cyclical dip. It signals that markets are repricing the competitive structure of the NAND industry itself, not just one downcycle in demand.

Who are the Chinese rivals?

Nikkei Asia points to emerging Chinese chipmakers as the specific new pressure. China's push into memory — most visibly Yangtze Memory Technologies (YMTC) in NAND — has been the subject of US and Japanese export controls for years, precisely because policymakers judged domestic Chinese capability in flash memory to be a competitive and security concern.

Those controls have not erased the threat. Chinese producers have kept shipping, kept developing layers-stacking technology, and increasingly served domestic smartphone and electronics makers that once bought from Kioxia, Samsung and SK hynix. Every wafer of Chinese NAND that displaces an import is a wafer of demand the established oligopoly doesn't capture.

For Kioxia specifically, the squeeze is structural. The company sells commodity-leaning flash into markets — consumer storage, smartphones, data center SSDs — where buyers switch suppliers on price. When a subsidized Chinese entrant undercuts on cost, Kioxia absorbs the margin hit first among the major vendors, because it lacks Samsung's balance sheet and SK hynix's DRAM cushion.

What does this mean for Japan's chip strategy?

Kioxia is Japan's last major merchant memory maker, and Tokyo has treated it as strategic infrastructure. The government-backed 2020 investment consortium that took control of Toshiba Memory was explicitly designed to keep NAND production and process technology on Japanese soil. Since then, Kioxia has funneled capital into advanced-node development at its Yokkaichi and Kitakami plants, betting that BiCS-era layer-count leadership would protect its economics.

A two-thirds value collapse tests that bet. If Chinese rivals close the process gap while scaling capacity at home, Kioxia's returns on each successive fab investment get thinner, and the case for pouring more capital into next-generation nodes gets harder to make to shareholders nursing heavy losses.

Nikkei Asia's report does not forecast Kioxia's exit from the market, and the company retains world-class fab assets and technology partnerships. But the direction of the story is clear: the NAND market that Kioxia helped build is no longer a four-player game, and investors have already marked the shares down accordingly. The next flash-cycle upturn will show whether Kioxia's pricing power — and with it the stock — can recover with Chinese capacity in the mix.