Who Accommodates Index Rebalancing Demand? Investor-Type Evidence from Korea
Finance Research Letters (Under Review) (2026)
- 영향력 지수Impact Factor
- 6.9
- 분위Quartile
- Q1
초록Abstract
Using daily investor-type trading flows around KOSPI 200 and KOSDAQ 150 reconstitutions (2016-2025), this paper identifies who supplies liquidity to the mechanical demand created by index funds. Around rebalancing dates, index investment trusts execute large mechanical trades that are absorbed primarily by foreign investors, who accumulate ahead of the event and distribute on the rebalancing day. The investor-type decomposition reveals foreign investors as the marginal liquidity provider behind the documented pre-event price run-up and its partial reversal, evidence that the price effects of index reconstitution are intermediated by a specific class of investors rather than the market at large.
연구 방법Methodology
Overview
This paper decomposes the daily trading flows of eleven investor types around semiannual reconstitutions of the KOSPI 200 and KOSDAQ 150 indices to answer a microstructure question that price-only studies cannot: when index funds must mechanically buy additions and sell deletions, who takes the other side?
Key Findings
- The mechanical demand of index investment trusts concentrates on the day before the rebalancing date.
- Foreign investors are the dominant accommodating counterparty, absorbing roughly four-fifths of addition demand and the majority of deletion supply.
- Foreign investors accumulate during the pre-event window and distribute on the rebalancing day, directly tracing the arbitrage behind the price run-up and partial reversal.
Status
Current Status: Under Review Journal: Finance Research Letters (SSCI, Q1) Author Role: First author