rebalance treated only today's S&P 500 members as the strategy's, so a held
name that left the index (or was renamed on Wikipedia) was never sold and
its value shrank the investable amount, unlike quant-trading's engine, which
sells non-members at the next rebalance. Now every USD stock/ETF position
is managed except execution.unmanaged (AAOI); a holding without bars is
priced from the account for its exit. On the paper account the managed set
is unchanged (the 10 current members).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>