The Russell 2000 is not expected to “start buying” SPCX in a single moment ; index-related buying would usually happen around a scheduled rebalancing or inclusion date, not as a one-day event. Based on the latest public reporting I found, the more concrete index-buying window appears to be late June into early July, with one report saying the iShares Russell 1000 ETF may hold SPCX starting June 29 and QQQ around July 7.

What that means

  • If you mean Russell index funds , they typically buy when the stock is officially added or when tracking portfolios are adjusted to match index changes.
  • If you mean the Russell 2000 index itself , it does not literally “buy” stocks; funds tracking it do.
  • The recent reporting suggests SPCX is already being positioned for mechanical inclusion in major indexes , which can trigger automated purchases from index funds.

Timing signals

The strongest timing clue in the reporting is that SPCX began trading on June 12 and was described as queued for mechanical index inclusion soon after. Another source says some index funds are expected to hold SPCX beginning June 29 and July 7, which implies buying pressure can start before those dates as managers prepare. In practice, that means the buying is likely to ramp up around late June and early July , rather than on one exact day.

Practical takeaway

For a trader, the key point is that index-driven demand usually shows up before and around the inclusion date. For a long-term investor, that kind of buying can help liquidity and support the stock, but it does not guarantee a sustained rise. This is more of a rebalance effect than a fundamental change in the business.

TL;DR

SPCX-related Russell-style index buying appears most likely around late June 2026, with some reported fund holdings starting June 29 and others July 7. If you meant the Russell 2000 specifically, it’s the funds tracking the index that buy, not the index itself.