Newsig · MarketWatch
Here’s who’s joining the S&P 500 in the index’s latest shakeup
Twilio gets the nod, as current component Warner Bros Discovery is due to merger with Paramount.
Why it matters
TWLO (Twilio) · Why linked: Twilio is being added to the S&P 500 in the latest index rebalance. Market context: Inclusion in the S&P 500 typically drives significant demand for the stock from index funds and institutional buyers, supporting the share price.
WBD · Why linked: Warner Bros. Discovery is being removed from the S&P 500 due to its upcoming merger with Paramount. Market context: Removal from the S&P 500 forces selling by index-tracking funds, creating selling pressure on the shares.
SPY (SPDR S&P 500 ETF) · Why linked: The S&P 500 index itself is undergoing a rebalance with Twilio added and Warner Bros. Discovery removed. Market context: The rebalance has minimal impact on the aggregate index but shifts flows between the two constituent stocks.
How SPY usually react
This story is too recent for its own reaction record — we score each asset against the actual price move 24h after publication. These are the long-run figures across every event we have tracked for them.
| Asset | Events | Avg max move | Closed lower |
|---|---|---|---|
| SPY | 16 | +0.70% | 69% |
Curated by Newsig — News in. Signal out.
How the reaction data is measured · Editorial policy