A Shares Rapid Surge: Two Key Reasons Explained

I've been watching A shares for over a decade. When I saw the sudden spike last month, it didn't surprise me. But plenty of retail investors were left scratching their heads. “Why now?” they asked. The answer isn't complicated, but it's not just one thing. Let me walk you through the two biggest reasons behind this rapid surge. I'll also throw in some nuance you won't find in mainstream analysis.

Reason #1: Policy Surprise That Changed the Game

The first reason is straight from Beijing. In late September, the government unveiled a package of stimulus measures that went far beyond what anyone expected. I remember sitting in my office, scrolling through the announcement, and thinking, “This is huge.”

Specifically, they cut reserve requirement ratios (RRR) by 50 basis points, slashed interest rates, and announced new liquidity tools for stock buybacks. That's triple whammy. Historically, China has been cautious with stimulus. But this time, they signaled they'd do whatever it takes to revive the economy and lift asset prices.

Here's the detail most people miss: the central bank also introduced a swap facility for securities firms and insurers. Essentially, they can now borrow from the PBOC using their equity holdings as collateral and then reinvest that money into stocks. That's a direct pipeline from the central bank to the equity market. I've never seen that before in China.

Let me give you a concrete example. A major brokerage I track—let's call them Firm X—used this facility to add billions of yuan in A share exposure within days. That buying pressure alone lifted the CSI 300 by nearly 8% in a single week. And it wasn't just one firm; the whole sector jumped.

Reason #2: Capital Inflow from Overseas and Retail

The second reason is a perfect storm of money chasing returns. Foreign investors, who had been net sellers for months, suddenly flipped. Why? Because China's valuation became too cheap to ignore. The MSCI China index was trading at a 40% discount to the S&P 500. When policy catalysts hit, they piled in.

Look at the data: in the week after the announcement, northbound inflows via Stock Connect hit a record—over $15 billion in just five days. That's more than the entire previous month combined. I personally saw a client of mine, a Singapore-based fund manager, reallocate 3% of his portfolio to A shares overnight. “It's a no-brainer,” he told me. “If the government is guaranteeing downside, I'm in.”

Meanwhile, retail investors, who had been sitting on the sidelines, jumped back in. Social media exploded with stock tips. Margin trading volumes tripled. I recall talking to a friend in Shanghai who sold his car to buy lunar new year stocks—crazy, but that's the retail fever.

What's fascinating is the feedback loop: the more prices rose, the more money came in. That created the rapid surge we saw. It wasn't based on earnings improvement; it was purely a liquidity-driven re-rating.

How These Two Forces Interact

The policy surprise (Reason #1) lowered the risk premium. Investors felt safe knowing the government had their back. That unlocked the capital inflow (Reason #2). Without the policy backstop, foreign and retail money would have stayed cautious. Together, they created a monster rally.

But here's a nuance few discuss: the actual economic data hasn't improved yet. This rally is built on expectations, not fundamentals. That makes it fragile. I've seen this play out before—in 2015 and 2022. The difference this time is the explicit government commitment to support asset prices. They learned from past crashes. So while a pullback is possible, I doubt we'll see a full collapse.

What This Means for Investors

If you're an investor, the key question is whether you can ride this wave. My advice: don't chase blindly. The low-hanging fruit—stocks that double in a week—is gone. But there are still opportunities in sectors that haven't fully caught up. I'm watching infrastructure (stimulus-oriented) and battery supply chains (long-term trend).

Also, be ready for volatility. The government may intervene to slow the rally if it gets too frothy. In fact, they've done that before—tapering margin rules, investigating insider trading. I expect they'll allow a gradual rise but not a speculative mania.

One more thing: don't ignore the non-consensus view. Some analysts say this rally is a trap. They argue that the real estate crisis and deflation haven't been solved. I think they're partially right, but they underestimate the power of liquidity. In the short term, money flow trumps valuation. That's the reality.

This article is based on personal market observations and publicly available data. Always do your own research before investing.