AMC Entertainment Holdings Inc (AMC)

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Studies suggest that index rebalancing anomalies generate excess risk-adjusted returns caused by stock index funds and institutional investors that benchmark the indexes.

https://seekingalpha.com/article/4515317-finding-abnormal-returns-russell-index-rebalancing-every-june

Loads of articles detailing the impact of being added. It is consider pretty bullish and Russell's is an annual one. It means a year upcoming for both AMC and HYMC shares to be forced to be purchased in accordance with the index. And diamond hand investors arent going to loose their shares readily for these index buyers to load up on the reconstitution day.