A specific number is going around — China's $28 trillion stock market opening further into Hong Kong. The individual pieces behind that number are real and well-documented. The combined figure itself needed more scrutiny than it's getting, so here's both: what's solid, and what's rounded.
Hong Kong's stock exchange added more market value in twelve months than most national economies are worth. That alone would be a story. What makes it a bigger one is why: a specific, accelerating policy decision to widen the pipe connecting Mainland Chinese capital to Hong Kong-listed markets, at a moment when the pool of capital sitting behind that pipe is enormous and still barely tapped.
Hong Kong Exchanges and Clearing's total market capitalization reached HK$47.4 trillion — roughly $6.05 trillion — by the end of 2025, up from HK$35.3 trillion a year earlier. That is growth of nearly 34% in a single year for an exchange that is already the sixth-largest in the world. By February 2026, that figure had climbed further, to HK$48.55 trillion, or about $6.25 trillion, across 2,673 listed companies. Average daily turnover nearly doubled over the same period. IPO fundraising rose sharply to roughly HK$286 billion — about $36.5 billion — and Hong Kong topped the global IPO rankings in the first quarter of 2026, ahead of every other exchange on earth for new listings raised.
A combined "$28 trillion" figure for China's stock market opening into Hong Kong is circulating, and it is worth being precise about where that comes from, because NGE could not locate one single source stating it directly. What can be verified: Hong Kong's own market cap, at roughly $6.25 trillion, is solid and current. Mainland China's household deposit pool reached RMB167 trillion — roughly $23 trillion — by December 2025, growing close to 10% year-on-year, and industry analysis notes that a mere 5% deployment of that pool would equal 6% of total Mainland China equity market capitalization. Working that ratio through implies a Mainland equity market on the order of $19 to 20 trillion. Add Hong Kong's $6.25 trillion to that estimate and the combined figure lands in the $25 to 26 trillion range — close to $28 trillion, in the right order of magnitude, but built from one precise number and one back-calculated estimate, not two verified ones. Treat "$28 trillion" as a reasonable approximation of a real and enormous combined market, not as a figure NGE can trace to a single primary source.
The reason this is a live story rather than a static fact is a specific, dated announcement. On August 3, 2026, China Securities Regulatory Commission Chairman Wu Qing said Beijing is working with Hong Kong authorities to expand the Stock Connect cross-border trading link further, specifically by adding yuan-denominated stock counters and real estate investment trusts to what the scheme already covers. Stock Connect — the mechanism launched in November 2014 linking the Shanghai and Shenzhen exchanges to Hong Kong — already gives international investors access to more than 800 Mainland-listed companies with market capitalizations above $1 billion each, and gives Mainland investors a Southbound route into Hong Kong-listed shares in return. This is not a new mechanism being announced. It is an already-proven, decade-old mechanism being deliberately widened, by the regulator who runs it, at a moment when Hong Kong's own market is already absorbing record capital.
The more interesting number sits underneath both of the ones above. Academic research tracking the scheme found that as of December 2022, international investors held just RMB2.2 trillion of A-shares through Stock Connect — 2.53% of total A-share market capitalization, itself already more than ten times the level from a few years earlier. Industry analysis from BNY Mellon made the same point from the other direction: international investors hold only around 2% of Chinese stocks overall, meaning Stock Connect, China's markets, and the investment service providers around them all have what analysts describe as ample room to develop for years to come. A market this size, this lightly held by outside capital, expanding its own connective infrastructure on purpose, is a different kind of story than a market simply going up.
The individual numbers here are real: a $6.25 trillion exchange that grew 34% in a year, a $23 trillion household deposit pool barely 2.5% deployed into equities, and a regulator publicly committing to widen the pipe between them. The headline "$28 trillion" figure is a reasonable rounding of that story, not a number this letterhead can trace to one source — and the gap between those two facts is worth knowing before you repeat either one.
This resolves in a specific, checkable way. If the yuan-denominated counter and REIT expansion Wu Qing described actually launches within the next twelve months, and Southbound and Northbound Stock Connect turnover both show sustained growth beyond the current cycle, the "gateway widening" thesis holds. If international holdings of A-shares via Stock Connect stay pinned near the current low single digits despite the infrastructure expansion, the bottleneck is elsewhere — likely capital controls or investor risk appetite rather than plumbing — and the story is smaller than the headline number suggests.
Hong Kong's market has genuinely grown at a scale that changes its standing among global exchanges — that part is fully verified. China's regulator has genuinely committed, on the record and dated, to widening the specific mechanism connecting Mainland capital to that market. What is not fully verified is the specific "$28 trillion" figure now attached to the story; it's a defensible approximation of two real numbers, not a confirmed single statistic, and this letter would rather say that plainly than repeat a rounded number as if it were sourced.