Why didn't the Hang Seng Tech index hit new highs alongside A-shares?
Bottom line first.
As of May 20, 2026, the strength of A-shares and the weakness of Hang Seng Tech are not due to one asset pool having lagging components; rather, it is a divergence between two sets of pricing logics. On May 20, 2026, the Shanghai Composite Index closed at 4162.19 points, still fluctuating near 4200; meanwhile, on its most recently available closing date of May 19, 2026, the Hang Seng Tech Index closed at 4857.46 points, which is still short of the phase historical high point of 10945.22 recorded on February 17, 2021, by 55.6%.
If your statement that the “CSI 300 ETF has matched its historical peak” refers to the most common 510300, the closing price I captured on 2026-05-20 was 4.871. This still represents about a 16.1% drawdown from the 5.807 recorded on 2021-02-10, and has not reached an all-time high. It is highly likely that various calculation bases were mixed here: Price, Net Asset Value (NAV), Adjusted NAV, Total Return Index. They look like they are the same thing, but they actually are not.
Allow me to correct a name. The “China Golden Dragon Fish Index” you mentioned usually refers to the Nasdaq Gold Dragon China Index, whose English name is Nasdaq Golden Dragon China Index, not “Golden Dragon Fish.”