Shanghai-Shenzhen 300 and Over 10 Indexes to Adjust Samples Starting June 12, Tech Weightage Increased
Miles Bennett
The CSI 300, SSE 50, STAR 50, and more than ten other core A-share indices will swap constituents after June 12, lifting the combined weight of IT and new-economy sectors — the base map for passive money is being redrawn.
Which stocks are moving in, and by how much?
The CSI 300 (沪深300) is replacing 19 constituents, adding Huagong Tech (华工科技) and Longsys (江波龙) among others. IT and telecom services weighting rises.
The SSE 50 (上证50) adds 5 stocks including TBEA (特变电工), Shengyi Tech (生益科技), and GigaDevice (兆易创新). After the reshuffle, new-economy sectors — IT, healthcare, telecom — reach 28% of the index, up about 3 percentage points.
The STAR 50 (科创50) adds 4 stocks including Hua Hong Semiconductor (华虹公司) and Moore Threads (摩尔线程). Combined market-cap coverage of the STAR board by the STAR 50 and STAR 100 rises by 6%.
What determines which stocks go in or out?
Reshuffles follow average daily total market cap and average daily turnover rankings — quantifiable, objective metrics.
The methodology is published in full on the SSE and CSI websites. In plain terms = no one is hand-picking stocks; a transparent, auditable ranking formula runs automatically.
This means → the constituents that move in have already been "voted in" by market capital. The index simply puts the vote count on the table.
Why is this reshuffle's signal unusual?
Industry participants note that the reshuffled indices will significantly increase their coverage and representativeness of "new-quality productive forces" (新质生产力) — China's policy term for advanced manufacturing and hard tech.
This reflects a structural shift in A-share indices toward higher-quality growth — not a slogan, but weighting numbers actually moving.
The SSE 180 (上证180) shows the same direction: new-economy weighting reaches 26%, up about 1 percentage point.
What does this mean for ETFs that track these indices?
Industry sources say the capital flow triggered by a reshuffle is brief and predictable. "The overall pool doesn't change."
In plain terms = when passive money flows out of a removed stock, other indices or thematic funds typically pick up the slack — the capital doesn't vanish.
Historically, there is no consistent short-term pattern in how added or removed stocks perform. The market already prices in the reshuffle mechanism rationally.
How should ordinary investors read this?
Regulators continue to push long-term assessment frameworks. Large mutual funds and insurers — "patient capital" — are tilting further toward medium- and long-term horizons.
This means → the market's focus is shifting from "tactical plays around a single reshuffle" to long-term investment value and company fundamentals.
For ordinary investors, the point is not to front-run the constituent list — it is to see which direction the base weighting map is moving.
Content is for reference only, not financial advice.