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Have you ever wondered why the prices of the S&P 500 or Nasdaq move rapidly in the second after a news release occurs during scheduled events?
What actually happens in that “one second”:
1. Machines read the release, not humans.
For scheduled data (CPI, UoM, payrolls, etc.), the numbers hit machine-readable news feeds at the exact time. Co-located algos parse the surprise vs. consensus and fire orders in milliseconds.
2. Liquidity gets pulled before the print.
Liquidity providers don’t want to be run over, so they cancel/halve quotes a few seconds before. The book thins dramatically; a relatively small burst of market orders can rip through multiple levels.
3. Stops/queues cascade.
Break a level → resting stops trigger → more market orders → more slippage. That creates the “instant” move.
4. Options dealer hedging accelerates it.
If dealers are short gamma, a quick move forces them to hedge with price (sell on down, buy on up), amplifying the spike.
5. Pre-positioning ≠ foreknowledge.
People take views before the event; the book can lean one way. When the number hits, price jumps in the direction that punishes the crowd most / matches the surprise. That can look like “they knew,” but it’s usually positioning + thin liquidity.
6. Unscheduled headlines.
News-scanning/NLP algos ingest verified sources and push orders in milliseconds. Again, it’s speed + liquidity, not a human decision.
Do market makers decide direction beforehand?
No. Their job is to quote and manage inventory risk. Into events they mostly widen, reduce size, or step back. Direction is set by order-flow imbalance once the data hits and by the stop/hedging cascade that follows.
Trading takeaway (since we can’t beat ms-bots):
• Either be positioned before with defined risk, or trade the second move: wait 1–2 minutes for acceptance/rejection of the spike zone, then go with it.
• Use stop-limits during news to control slippage.
• Size down; expect wider ranges and faster fills around the print.
That’s why it moves “in a second”—computers + a temporarily hollow book, not a secret decision room.
#trading #algorithm #algorithemic #SPX500 #nasdaq #stockmarket
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