Tencent's AI capex just made its memory supplier China's most valuable company

A 17-day-old Chinese memory chipmaker became China's most valuable listed company this week, and the trade that lifted it was paid for by the company it just passed. ChangXin Memory Technologies (CXMT) closed at a $524 billion market capitalization seventeen days after its July 27 listing, ahead of Tencent's $510–511 billion (Tom's Hardware, citing CXMT's IPO prospectus and Tencent's Q2 results). It is the first semiconductor firm to top the mainland in the market's 35-year history, the first time a chipmaker rather than an internet platform has held the slot.

The crossover rewards the seller in the AI capex cycle and punishes the buyer over the same purchase orders. Tencent's second-quarter release, filed the same week, showed capex of RMB 52.8 billion (about $7.8 billion), up 176% year over year, even as domestic games revenue rose 17% and marketing services rose 22% (Tencent 2026 Q2 results PDF). Free cash flow turned negative at –RMB 13.8 billion (about –$2.0 billion), a first for a quarter in which revenue grew 11% to RMB 204.8 billion ($30.3 billion) (SCMP; TheNextWeb). TCEHY, Tencent's US-listed shares, fell 5.34% the day after the print and are down roughly 26% year to date.

CXMT sits on the other side of those purchase orders. The company raised $8.6 billion in its July 27 Shanghai IPO, with first-day shares surging 466% (CNBC). Server DRAM's share of CXMT revenue climbed from 8.4% in 2024 to 26.5% in 2025, per the prospectus; first-quarter 2026 operating profit reached 35.43 billion yuan ($5.2 billion), a turnaround from a year-earlier loss (Tom's Hardware).

The supplier relationship is on the record and not bilateral. In June 2026, Tencent signed a roughly $3 billion server DRAM agreement with CXMT; in July, CXMT signed a separate five-year server DRAM deal with ByteDance valued at more than $7 billion. Two Chinese hyperscaler-scale buyers in the same quarter put CXMT's position across the domestic AI build-out, not just one customer's order book. CXMT held 7.67% of the global DRAM market in 2025, per the prospectus.

On a global scale, CXMT's $524 billion is roughly half of Micron's $1 trillion and around 60% of SK hynix's $880 billion; the comparison set is the established memory oligopoly, not the internet platform it just passed (Tom's Hardware). CXMT's stated target is 30% global DRAM share by 2030, up from 7.67% in 2025, with a sixth mega-fab planned to close the gap. The path runs through a constraint the prospectus does not hide: CXMT still lacks the EUV lithography tools that Micron and SK hynix use to print the smallest features on a chip and make the densest memory cells (Tom's Hardware).

The memory pricing that lifted CXMT's margins is cyclical, as is the AI capex that lifted Tencent's bill. A supplier paid today while a buyer still pays for the build-out is the asymmetry at stake; both ends can compress in the same quarter. The two prints that show whether the gap holds are Tencent's next capex update and CXMT's first post-IPO quarterly report, both expected in late August.