The Receipts Week — 72 Hours When JASM Booked 143x YoY, Kioxia Took Japan's Semi Sales Crown, and Nissan Chemical Extended Capex to 2030

Lead — Three numbers arrived through the same window

Between September 1 and September 4, 2026, Tokyo Shoko Research (TSR) published its earnings tally for Japan's semiconductor manufacturers, and two figures jumped off the page. TSMC Japan (JASM) posted profit growth of 143x year-over-year, and Kioxia (285A) took the number-one spot in the sales league. That same week, the CFO of Nissan Chemical told Nikkei that the semiconductor materials segment would keep spending capex through 2030. The three numbers come from different accounting cycles, but they point the same way. The AI cycle is no longer future tense on a conference slide — it's past tense on a filed income statement. And the company sitting dead center is Kioxia, with two forces closing in from above and below in the same news week.

JASM 143x — The first ledger entry for vertical integration in Japan

The 143x looks extreme, but the accounting is natural: Kumamoto Fab 1 booked its first real year of production revenue, and the prior-year comparable was near zero. The direction matters more than the multiple. On TSR's ranking, JASM has now entered the upper league of Japanese semiconductor revenue, and once Kumamoto Fab 2 (6/7nm) begins production, the number is repriced again. The top of Japan's semiconductor sales table has, as of this earnings cycle, become a nationality-hybrid structure — TSMC-branded revenue counted as Japanese revenue.

Kioxia's sales crown — but there are teeth marks on the crown

The same table put Kioxia (285A) at number one in sales. NAND spot has bottomed, QLC demand has migrated toward data-center SSD, and gross margin has normalized. But in the very week the crown was announced, two pieces of news arrived that will mark it.

The force from above: On September 2, multiple outlets reported that the chairman of SK Group is considering building a new fab in Japan and expanding cooperation with Kioxia. semiconportal's Izumiya column framed it as SK Hynix evaluating simultaneous new-memory lines in both Japan and Korea. A partnership brings capital and an HBM channel to Kioxia's door. An equity relationship, however, dilutes the "independent NAND champion" narrative that has been Kioxia's story since re-listing.

The force from below: Gendai Business ran a feature the same week arguing that Chinese NAND makers are narrowing the technology gap with Kioxia. Narrowing does not mean immediate share loss, but once China-price appears at 200-layer-plus 3D NAND, the QLC margin cycle shortens.

So Kioxia's number-one ranking is a station, not a destination. The 12-month trajectory of the SK partnership terms above, and the Chinese stack-entry pace below, will govern 285A's valuation from here — more than the profit that just landed.

Nissan Chemical 2030 — Materials get paid regardless of who wins

The Nissan Chemical CFO's "capex through 2030" line (Nikkei, September 2) is the quietest of the three numbers but the longest-dated. Semiconductor materials — particularly lithography BARC and EUV underlayer — are consumed whichever of foundry, NAND, or DRAM wins the cycle. Nissan Chemical's five-year capex commitment is therefore a hedge that refuses to predict the AI winner. Shin-Etsu (4063) and Tokyo Ohka (4186) are being re-rated on the same logic, and Weekly Economist's H2-2026 top-10 list, which placed three materials names, was the market's confirmation this week.

Two counter-signals — TEL -5.1% and the Advantest reweighting

In the same window, Nikkei reported that Tokyo Electron (8035) fell -5.1% in a single session on paired US–Japan rate concerns. The same names that appeared as earnings winners appeared as rate losers, which is the honest reading of this cycle: profit has arrived, but valuation is a hostage to interest rates. SBI Securities separately noted that Advantest's (6857) Nikkei 225 weight adjustment in October could open a trading window — index-driven outflows create a lower entry on a name whose earnings quality is not in dispute.

The PM read

The three numbers each say a different thing. JASM's 143x confirms a reshuffle at the top of Japan's semi sales table. Kioxia's number-one rank confirms NAND cycle normalization. Nissan Chemical's 2030 commitment confirms long-cycle materials visibility. But the SK chairman's remarks and the China-narrowing-gap piece in the same week make clear that Kioxia's story is no longer decided by Kioxia alone over the next 12 months. 285A will be re-rated by the pace of the two variables above (SK) and below (China), more than by the profit that just printed. The materials side (4063, 4186) and the equipment side (6857, 8035) are the opposite trade — hedges that don't require predicting the winner.

Key Sources: - AI Boom Lifts Semiconductor Earnings; Kioxia Leads, TSMC Japan Up 143x (Tokyo Shoko Research, 2026-09-04) - AI boom drives Japanese chipmakers; Kioxia sales leader, TSMC Japan surges 143-fold (Yahoo! News, 2026-09-04) - Nissan Chemical eyes capex through 2030 as semiconductor materials thrive (Nikkei, 2026-09-02) - SK Hynix to Build Memory Factories in Japan and Korea, Accelerating Capital Spending (semiconportal, 2026-09-02) - Chinese Chipmakers Narrowing Gap with Kioxia in Global Semiconductor Competition (Gendai Business, 2026-09-01) - plus 5 more