40-Day Correlation Between Chinese Equities and Yuan Hits Three-Year High
Claire Weston
The 40-day correlation between the CSI 300 and the renminbi has climbed to a three-year high, with both assets rising in lockstep every month in 2026 — driven by a foreign-inflow feedback loop that is also narrowing the PBOC's policy room.
Stocks and currency rising together — by how much?
In April and May the CSI 300 gained roughly 10% while the yuan strengthened about 1.8% against the dollar.
The two assets have moved in the same direction every month in 2026; their 40-day correlation hit a three-year high this month.
This means → buying A-shares and going long the yuan are now effectively the same trade; previously they could diverge.
Why are they in sync? How does the money flow?
Foreign funds buying A-shares via Stock Connect's northbound channel must first purchase offshore yuan (CNH) — the very act of buying stocks bids up the currency.
This week, overnight CNH funding costs in Hong Kong saw their biggest single-day jump since February, confirming the flow's intensity.
In plain terms = to buy Chinese stocks, foreign investors must first "swap into yuan"; the more people swap, the stronger the yuan gets — and that is what locks stocks and currency together.
How much did foreigners actually buy — and why did they come back?
Morgan Stanley data: offshore-registered funds net-bought $1.3 billion in Chinese equities in April, fully reversing March's net outflow.
Three drivers: rising confidence in China's AI and hardware sectors, a more active tech-IPO pipeline, and easing US-China trade tensions.
This reflects a broader shift — global investors are treating Chinese assets as an alternative to dollar holdings amid rising geopolitical uncertainty.
What does the "confidence loop" mean?
Saxo Markets chief investment strategist Charu Chanana frames it this way: a stronger yuan lends credibility to the equity rally, while a firmer daily fixing reduces FX risk, pulling more foreign capital in.
She noted: "The renminbi is becoming part of the policy toolkit to underpin market confidence."
In plain terms = stable FX → foreigners dare to buy → stocks rise → confidence strengthens → FX stays stable — a self-reinforcing loop.
Where is the trouble for the central bank?
Stock-FX co-movement means any PBOC rate cut to support growth could weaken the yuan — and a weaker yuan would drag equities down too. Policy tools get amplified or distorted.
This means → the PBOC's room to manoeuvre between "support growth" and "stabilise the currency" is shrinking.
Whether this loop holds depends on whether the dynamic equilibrium between foreign inflow pace and yuan-fixing policy stays intact — if either end falters, the virtuous cycle could reverse.
Content is for reference only, not financial advice.