# Trade Desk Drops 4% as Index Exit Pressures

> Trade Desk falls 4% amid index rebalance flows, while peers split in ad-tech sector.
- Title: Trade Desk Drops 4% as Index Exit Pressures · 24/7 Wall St.
- Summary: Trade Desk falls 4% amid index rebalance flows, while peers split in ad-tech sector. Trade Desk stock drops 4% after S&P 500 index exit, with Magnite falling…
- Keywords: trade desk, magnite, applovin, ad-tech, s&p 500, index rebalance, programmatic advertising, nasdaq, Trade, Desk, Drops, Index
- Source: 24/7 Wall St. — https://247wallst.com/investing/2026/09/22/trade-desk-falls-4-as-index-removal-flows-keep-pressure-on-magnite-drops-3-applovin-pulls-back
- Author: David Moadel
- Published: 2026-09-22T15:59:27+00:00
- Read time: 1 min
- Topics: trade desk, magnite, applovin, ad-tech, s&p 500, index rebalance, programmatic advertising, nasdaq
## Trade Desk Falls 4%
Trade Desk stock is at $13.34, down 4% in Tuesday morning trading, and it’s down 65% year to date.
## Index Rebalance Pressures
S&P Dow Jones Indices announced on September 4 that The Trade Desk would leave the S&P 500 in the September quarterly rebalance and move to the S&P SmallCap 600.
## Peer Group Reactions
Magnite stock is at $24.55, down 3%, moving with Trade Desk stock on the same session, while AppLovin stock is at $327.95, down 0.67%.
## Programmatic Repricing
The split shows programmatic ad-tech is being repriced unevenly, with Magnite falling alongside Trade Desk but AppLovin holding steady.
## Index Exit Mechanics
Passive funds benchmarked to the S&P 500 have to sell the name mechanically, and the pressure that creates is finite once those flows clear.
## Value Case
Trade Desk stock now trades at a trailing price-to-earnings ratio of 13.45x, with customer retention rates above 95% for more than a decade.
## What to Watch Next
Index rebalance flows eventually exhaust themselves, so Trade Desk stock’s next move depends on whether real-money buyers step in at a depressed multiple.
## Key takeaway

Trade Desk stock drops 4% after S&P 500 index exit, with Magnite falling 3% and AppLovin barely moving as programmatic ad-tech reprices unevenly.