Hang Seng Index Rallies for Fifth Day to Reclaim 18,000 as Southbound Inflows Top HK$10 Billion

The Hong Kong stock market has shown strong performance recently, with the Hang Seng Index rising for five consecutive trading days to reclaim the 18,000-point mark. Meanwhile, Southbound capital saw net buying exceeding HK$10 billion in a single day, becoming a key driver of this rebound. Behind the improving market sentiment are both the intrinsic need for valuation repair and the resonance of policy expectations with improved external liquidity. This article analyzes the sustainability of the Hong Kong stock rebound from three dimensions: capital flows, valuations, and subsequent supporting factors.

Capital Flows: Southbound Funds as the Main Driver

According to public data from the Hong Kong Stock Exchange, Southbound net buying exceeded HK$10 billion in the most recent trading day, a rare occurrence. Historically, such levels typically appear when market sentiment shifts significantly or major positive news is released. Structurally, fund flows were concentrated in technology, financials, and high-dividend sectors, reflecting increased willingness among domestic investors to allocate to core Hong Kong assets.

The sustained inflow of Southbound capital is not accidental. On one hand, mainland investors have increased attention to undervalued Hong Kong stocks, especially as the AH premium remains at historically high levels, attracting arbitrage and long-term funds. On the other hand, some mainland public funds and insurance capital are rebalancing portfolios at the year-end and beginning of the new year, making Hong Kong stocks an important choice as a valuation trough. Additionally, the recent stabilization of the RMB exchange rate has reduced concerns about currency conversion for southbound funds.

Valuation: Room for Repair Remains but Divergence is Evident

After the consecutive rally, the Hang Seng Index's price-to-earnings ratio remains below the median of the past five years, and the price-to-book ratio is also below the historical average. From a global comparative perspective, Hong Kong stocks still trade at a significant discount to US stocks and A-shares, providing a margin of safety for medium- to long-term funds. However, the valuation repair is not broad-based but structural: high-dividend state-owned enterprises, internet leaders, and some consumer stocks have performed strongly, while small- and mid-cap and property-related stocks have seen limited gains.

It is worth noting that after the Hang Seng reclaimed the 18,000-point level, some short-term profit-taking may cause volatility, but institutions generally believe that current valuations have not fully reflected earnings improvement expectations. According to strategy reports from several brokerages, if corporate earnings growth continues a moderate recovery, the index still has room for further upside.

External Environment: Rising Expectations for Fed Policy Shift

Another important backdrop for this rebound is the change in expectations for the Federal Reserve's monetary policy. Based on the latest FOMC statement and dot plot, market expectations for the number of rate cuts in 2025 have been revised upward, and US Treasury yields have fallen from highs, easing external liquidity pressures on Hong Kong stocks. Historical experience shows that during periods of declining US bond yields, Hong Kong stocks, especially growth sectors, often receive valuation boosts.

In addition, the phased easing of international geopolitical risks has improved global risk appetite. Some foreign institutions have recently raised their allocation recommendations for Chinese assets, arguing that Hong Kong stocks are attractive in terms of earnings-valuation matching. However, external variables remain uncertain, such as repeated US inflation data or renewed geopolitical tensions, which could interrupt the rebound.

Subsequent Support: Policy and Earnings as Dual Drivers

From a policy perspective, mainland pro-growth measures continue to intensify, including fiscal expansion, consumption stimulus, and capital market reforms, all of which support Hong Kong's fundamentals. In particular, regulators have repeatedly expressed support for the standardized and healthy development of the platform economy, leading to improved earnings expectations for the internet sector, which serves as an important stabilizer for Hang Seng heavyweight stocks.

On earnings, according to Bloomberg consensus estimates, the earnings growth of Hang Seng constituents in 2025 is expected to be in the mid-single digits, with the technology sector likely to grow faster than the overall index. If earnings materialize, the current valuation implies an attractive forward P/E. Moreover, the trend of sustained Southbound inflows remains unchanged, with cumulative net buying this year already exceeding the same period last year, indicating persistent allocation demand from mainland funds.

Risks and Outlook

Despite strong short-term rebound momentum, the market should remain vigilant about several risks: first, global liquidity easing may fall short of expectations, causing US bond yields to rebound; second, if mainland economic recovery is weaker than expected, it could drag corporate earnings; third, geopolitical and trade frictions remain uncertain and could trigger periodic volatility.

Overall, the Hang Seng's five-day rally to reclaim 18,000 is the result of the combined effect of capital flows, valuations, and policy expectations. Southbound net buying exceeding HK$10 billion in a single day highlights domestic investors' recognition of Hong Kong stock value, but whether the index can hold above 18,000 and move higher will depend on sustained volume expansion and earnings validation. For medium- to long-term investors, current valuations offer a good entry window, but structural selection is key, prioritizing sectors with stable cash flows, high dividend yields, and strong earnings certainty.