Introduction
A+H listings (Mainland China companies already listed on the Shanghai or Shenzhen A-share market issuing new H-shares on HKEX) are the engine of Hong Kong's record 2026. KPMG's third-quarter 2026 IPO review counts 116 listings raising more than HK$388 billion in the first nine months, more than double the same period of 2025 and the highest nine-month total in the market's history, with 38 A+H listings providing nearly 70% of proceeds. Over the same nine months Hong Kong ranked second globally behind Nasdaq, and KPMG projects that full-year proceeds could approach HK$500 billion, which would beat the HK$449.5 billion annual record set in 2010. The 2025 rebound that set up this run, led by CATL, is covered in the 2025 Hong Kong IPO surge. This article explains the machinery behind the pipeline: how the dual listing works and prices, the regulatory fast track that speeds A-share issuers to Hong Kong, and the Stock Connect flows that deepen demand.
A+H Structural Mechanics
- A+H Listing
A dual-listing structure in which a Mainland China company is listed on both an A-share market (Shanghai SSE or Shenzhen SZSE) and HKEX (H-shares). The A-shares keep the issuer's Mainland retail and institutional base, while the H-shares open it to international institutional capital. Because the company is already public, the Hong Kong deal is an offering of new H-shares by a listed company, which HKEX and the league tables still count as a new listing.
The Dual-Listing Mechanic
An A-share company adds its Hong Kong line by offering new H-shares on HKEX, creating a separately tradable listing alongside its existing A-shares in Shanghai or Shenzhen. Both lines are claims on the same company, but they trade in separate venues under separate regulators (CSRC for A-shares, SFC/HKEX for H-shares), and the two share classes are not fungible: an investor cannot convert H-shares into A-shares to close a price gap.
Capital Pool Diversification Rationale
Mainland China companies pursue A+H listings primarily to reach international institutional capital (sovereign wealth funds, global mutual funds, hedge funds) without giving up their Mainland investor base. The structure is particularly valuable for capital-intensive issuers (CATL with its battery capex, AI hardware suppliers such as Zhongji Innolight, healthcare companies with R&D needs), where the combined capital pool exceeds what either market alone could provide. For the venue trade-offs behind that choice, see how issuers choose between NYSE, Nasdaq, HKEX and LSE.
Price Convergence Dynamics
A+H listed companies frequently trade at different prices in the two markets due to capital-flow restrictions, currency considerations, and investor-base differences. The premium of A-shares over H-shares (after FX adjustment) is typically expressed as:
where is the A-share price in RMB, the H-share price in HKD, and FX the HKD-to-RMB conversion. Historically the gap has run 20-40 percent (A-share premium), but it narrowed in 2025 as large A+H deals deepened HKEX-side trading and Stock Connect Southbound flows grew.
The Regulatory Framework
The CSRC's evolving approach to overseas listings, paired with a faster Hong Kong review, is the structural driver of the A+H wave that began in 2025 and accelerated in 2026.
The 2023 Filing-Based Regime
Since 2023, the CSRC shifted from an approval-based regime to a filing-based regime for Chinese companies listing overseas. Under the filing regime, companies notify the CSRC by filing required documents rather than waiting for formal approval. The shift removed a structural bottleneck that had previously constrained overseas-listing activity.
The October 2024 Fast-Track Channel
On October 18, 2024, the SFC and SEHK issued a joint statement on an enhanced timeframe for new listing applications that created an accelerated review for A-share listed companies expected to have a market capitalisation of at least HK$10 billion (about US$1.3 billion). Qualifying applicants receive a single round of regulatory comments, and each regulator commits to finish its assessment within 30 business days, not counting the time the issuer and sponsor take to respond. If a regulator raises material concerns, the application reverts to the standard timetable.
The April 2024 Cooperation Measures
The CSRC announced five measures for capital market cooperation with Hong Kong in April 2024. Four widen Stock Connect and fund links (more eligible ETFs, REITs added to Stock Connect, RMB-traded counters added to Southbound, and an enhanced mutual recognition of funds scheme). The fifth commits the CSRC to support leading Mainland companies listing in Hong Kong, the policy signal that preceded the A+H wave.
The H-Share Filing Requirement
H-share issuers are required to apply to the CSRC for filing within 3 business days after applying to HKEX for listing, without getting prior approval from the CSRC. The post-application filing structure provides regulatory visibility while preserving the issuer's ability to launch quickly.
A+H Execution Workflow
Issuer Review of A+H Strategy
Mainland A-share company evaluates Hong Kong listing for international capital access.
Bank Selection and Bake-Off
Issuer selects HKEX bookrunners (typically a mix of US/European bulge brackets, Chinese banks, and HK-based banks).
HKEX Listing Application
Issuer files its HKEX application; A-share issuers with an expected market capitalisation of at least HK$10 billion can use the accelerated 30-business-day review.
CSRC Filing
H-share issuer files required documents with the CSRC within 3 business days of the HKEX application.
Cornerstone Roadshow and Wall-Cross
Banks engage cornerstone investors (BlackRock, Temasek, QIA, Mubadala, Fidelity) and broader institutional accounts.
Public Roadshow
Compressed roadshow targeting Hong Kong, Singapore, London, and global accounts.
Pricing and Settlement
H-share pricing on HKEX at moderate discount to A-share prevailing price; post-IPO trading sees price gap convergence supported by Stock Connect Southbound flows.
CATL: The Marquee 2025 A+H Deal
CATL's 2025 Hong Kong listing was the deal that proved the structure at scale and opened the window for the 2026 wave.
Deal Mechanics
CATL sold new H-shares on HKEX in May 2025, raising HK$35.7 billion (US$4.6 billion) in the base offering and about HK$41 billion (about US$5.2 billion) once the over-allotment option was exercised. The deal was the world's largest IPO in H1 2025 and the year's largest until being eclipsed by Medline's $6.26 billion Nasdaq listing in December.
Process and Timeline
The Hong Kong offering took 128 days from kick-off to completion, materially faster than the timeline that would have applied without the fast-track channel. The compressed schedule reflected both the accelerated regulatory review and CATL's existing public-company disclosure as a Shenzhen-listed issuer.
Trading Performance
CATL shares closed 16 percent above the offer price on their Hong Kong debut, validating both the pricing and the depth of international demand. The aftermarket reflected a cornerstone-anchored bookbuild (the mechanics are in cornerstone and anchor investors) and the appeal to global investors who had never held CATL directly.
Beyond CATL: The 2025 Cohort and the 2026 Wave
A+H issuance broadened quickly from the battery flagship to consumer, industrial and technology issuers.
From Condiments to AI Hardware
Foshan Haitian Flavouring & Food (the Shanghai-listed soy-sauce leader) raised HK$10.1 billion in June 2025, and Zhejiang Sanhua Intelligent Controls (HVAC and EV thermal management) listed on June 23 after raising about US$1.2 billion at HK$22.53 per share, closing flat on debut. The 2026 wave runs larger and more tech-heavy. Shenzhen-listed optical-module maker Zhongji Innolight raised HK$53.4 billion (about US$6.8 billion) at HK$980 a share in July 2026, Hong Kong's biggest share sale since Alibaba's 2019 secondary listing, before slipping on its debut amid an AI-stock sell-off. Solar-inverter and energy-storage leader Sungrow Power Supply refiled its HKEX application in April 2026 with CICC as sponsor. The spread from condiments to AI hardware shows the model is no longer an EV-battery story.
Stock Connect Southbound Flows
The Stock Connect program is the institutional plumbing that links the two markets and feeds Mainland demand into every A+H deal, alongside the listing-rule changes covered in the 2025 HKEX reform package.
- Stock Connect (Southbound)
The cross-border investing program (launched 2014) that lets Mainland Chinese institutional investors and eligible individuals buy Hong Kong-listed shares (Southbound) and lets international investors buy Mainland China A-shares (Northbound) through their existing brokerage relationships. Southbound access gives H-share issuers a Mainland bid alongside international demand.
Record Southbound Flows in 2026
Southbound trading set a new high in the first half of 2026. HKEX's 2026 interim results show Southbound average daily turnover of HK$123.1 billion (buy and sell trades combined), up 11% from the first half of 2025, alongside a record HK$283.0 billion headline cash-market ADT. The same release counts 24 A-share companies completing H-share listings in the half.
Southbound Demand for A+H Issuers
Southbound buyers add a Mainland bid to HKEX listings on top of the international investor base. That flow narrows the A-H price gap and supplies liquidity for both new-issue bookbuilds and aftermarket trading, giving A+H issuers a deeper capital pool than either market offers alone.
The A+H framework above is the structural mechanic that turned HKEX's 2025 rebound into a record 2026. The next article walks through European listing reform, where the UK Listing Rules and EU Listing Act represent Europe's response to the multi-year migration of European issuers toward US listings.
