According to @MilkRoadDaily, Robinhood Markets (HOOD) will be added to the S&P 500 effective Sept 22, marking a notable milestone for the brokerage, source: @MilkRoadDaily on X. For trade execution planning, S&P 500 index-tracking funds typically adjust holdings to include new constituents on or around the effective date, which can drive mechanical demand and concentrated closing-auction activity, source: S&P Dow Jones Indices. For crypto-focused market participants, Robinhood also offers crypto trading in assets such as BTC and ETH, making the development relevant when monitoring equity proxies for retail trading engagement, source: Robinhood Crypto.

According to @StockMKTNewz, Bloomberg reports that Interactive Brokers founder Thomas Peterffy is the world’s 22nd richest person at $75.2 billion and owns approximately 75% of Interactive Brokers (IBKR) (source: Bloomberg). S&P Dow Jones Indices confirms IBKR has been added to the S&P 500, and index-tracking funds replicate index holdings under its published methodology (source: S&P Dow Jones Indices). S&P Dow Jones Indices further weights constituents by float-adjusted shares, meaning high insider ownership like Peterffy’s reduces the index-eligible float for IBKR (source: S&P Dow Jones Indices; Bloomberg). Interactive Brokers states it offers cryptocurrency trading through regulated partners, giving clients access to digital assets such as BTC and ETH, which is relevant for crypto traders monitoring brokerage adoption (source: Interactive Brokers). Traders typically reference S&P Dow Jones Indices’ effective date, index shares, and float factor to assess passive rebalancing mechanics around inclusions (source: S&P Dow Jones Indices).