Which companies added to S&P 500Polymarket historical data and price history
Which companies added to S&P 500: a Polymarket equities series. Marketlens has captured 12 markets since October 28, 2026, of which 1 resolved, with $17.8K in traded volume. Every market's order book is captured as full depth L2 snapshots at regular intervals, alongside trades, candles, and the final resolution outcome.
For the equities archive as a whole, see Polymarket price history.
Data as of 2026-11-02 · Polymarket series Companies added to S&P 500 · slug companies-added-to-sp-500
Markets in this series
The most recently resolved of 12 markets.
Backtest this series
from datetime import datetime, timedelta, timezone
from marketlens import MarketLens, Strategy
class MyStrategy(Strategy):
def on_market_start(self, ctx, market, book):
ctx.buy_yes(size=10)
client = MarketLens()
end = datetime.now(timezone.utc) - timedelta(days=1)
result = client.backtest(
MyStrategy(), "companies-added-to-sp-500",
after=end - timedelta(hours=1), before=end, initial_cash=1_000,
)
result.show() # inspect the run in the dashboardAvailable datasets
Common questions
How many Which companies added to S&P 500 markets are in the archive?
12 markets from October 28, 2026 through now, of which 1 have resolved and 11 are active.
What data exists for each Which companies added to S&P 500 market?
Full depth L2 order book snapshots at regular intervals, individual trades, OHLC candles, and the resolution outcome. All of it is queryable by the series slug "companies-added-to-sp-500" through the API and Python SDK, or downloadable as Parquet.
How much does a typical Which companies added to S&P 500 market trade?
Average traded volume is $1.5K per market, $17.8K across the series.
Can I backtest strategies on Which companies added to S&P 500?
Yes. Pass the slug "companies-added-to-sp-500" to client.backtest() in the Python SDK. Execution mode replays order books against real historical depth; Alpha mode, one bar per market, covers every market in the series and suits its longer horizons.
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Try it
Pull Which companies added to S&P 500 books in one call
The free tier includes 2M data rows and every market open in the last 7 days, no card required.
$ pip install marketlens