
In today’s briefing:
- Another Passive Flow Trading Target Identified: Sejin Heavy in the Dec Shipbuilding ETF Rebal
- The 2025 Japan September-End Rebal and Dividend Trade
- Quiddity Leaderboard ChiNext & ChiNext 50 Dec25: Multiple Changes to Expectations; New Ideas

Another Passive Flow Trading Target Identified: Sejin Heavy in the Dec Shipbuilding ETF Rebal
- HHI–Mipo merger overlaps Dec review: Mipo dropped Nov 26, desk holds cash, rebal Dec 12, new HHI shares list Dec 15 but capped at 10%.
- No ad-hoc replacement for Mipo Nov 26; Dec review will add a new name, likely Sejin Heavy (075580 KS), with no other significant flows flagged.
- Sejin Heavy’s recent post-rally volume cools; passive inflow ~1.5x DTV may trigger visible price action, with potential front-running 1–2 days ahead of Dec 12 ETF rebal.
The 2025 Japan September-End Rebal and Dividend Trade
- Every year it’s the same trade. But sometimes it is not. This year it is Friday and Monday. Or not. Historically, the day before ex-date and ex-date see outright performance.
- The month-end and quarter-end bring big flows, or not, depending on how things have gone. This year they have gone well for equities, so odds are flows are smaller.
- Over the past 10 years or so, the two-day return on the March trade is pretty good. The September trade appears to be more mixed.
Quiddity Leaderboard ChiNext & ChiNext 50 Dec25: Multiple Changes to Expectations; New Ideas
- The ChiNext index represents the performance of the 100 largest and most liquid A-share stocks listed on the ChiNext Market of the Shenzhen Stock Exchange.
- The ChiNext 50 index is a subset of the ChiNext Index and it consists of the top 50 names in the ChiNext index with the highest daily average turnover.
- We see 7 changes for the ChiNext index and 5 changes for the ChiNext 50 index in the next index rebal event.