Kalshi retains volume lead as Polymarket US posts weekly growth

Volume Race’s weekly table puts Kalshi’s volume for the partial week of November 2 at $7.63B, down 2.7% week on week. Polymarket US reached $1.01B, an increase of 5.6%.

Volume moves in opposite directions

According to Volume Race, the latest table draws on the exchanges’ own daily reports. The figures were published on Nov 5, 2026, at 10:24 AM ET and cover only part of the week.

Kalshi remained the larger venue by reported volume despite its decline. Polymarket US recorded growth, but its reported total remained well below Kalshi’s.

A partial-week comparison

The figures offer an interim view rather than a completed weekly result. The supplied summary does not specify the daily reporting cutoff or provide a breakdown of activity by market.

That limits the conclusions available: the table shows contrasting volume trends, but does not establish which contracts drove them or whether those trends will hold through the rest of the week.

What it means for prediction markets

• Scale and growth differ: Kalshi leads in reported volume, while Polymarket US has the stronger week-on-week percentage change.
• The reporting window matters: These partial-week totals should not be treated as final weekly results.
• Volume is not a probability signal: The supplied figures do not show changes in contract prices or implied outcome probabilities.