On June 5, 2026, VolRoc recorded 75,475 active prediction markets across Kalshi and Polymarket, holding $1.46B in combined open interest. Day over day, active markets rose 51.5% and open interest rose 4.9% (vs June 4, 2026). Sports was the largest domain by open interest (45%), ahead of Politics & Elections (30%); together they accounted for 74% of all open interest. Kalshi carried 89% of active markets and Polymarket 11%.
Deterministic · template v1 · 2026-06-05
As of 2026-06-05 · 00:00 UTC
Active Markets
75,475
00:00 UTC freeze
Open Interest
$1.46B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
13,871
with trading activity
Kalshi / Polymarket
89% / 11%
by active-market count
Domain Composition — 12 domains
Sports
43,076
Other
12,131
Mixed / Multi-category
8,935
Politics & Elections
5,834
Entertainment & Culture
2,270
Crypto & Digital Assets
1,041
Economics & Inflation
744
Companies & Business
478
Monetary Policy
372
Technology & AI
273
World & Geopolitics
149
Science & Health
86
Climate & Weather
86
Venue-agnostic subject taxonomy from Kalshi series prefixes and
Polymarket title keywords. A residual Other bucket is reported honestly.
Yes-price across both venues, 10 buckets from 0 to 100. n = 75,475.
Largest Kalshi Series
Sports — multi-game parlays
33,449
Cross-category multi-markets
8,935
Music — artist streams
857
Midterm control
726
U.S. House races
595
California primaries
347
Primary vote shares
269
NFL — next team moves
231
Primarymov
206
World Cup — games
198
Nextteamnba
188
Nbadraftteam
188
Kalshi market families (Polymarket is not series-structured).
About & Citation
This is the fixed-hour (00:00 UTC) state of every active market on
Kalshi and Polymarket for June 5, 2026. The live
Observatory
shows the current diurnal value; this record is immutable. Open interest combines Kalshi
open interest with Polymarket USD liquidity as comparable USD magnitudes. Sources: Kalshi, Polymarket.
How to cite
“VolRoc Prediction Market Archive — June 5, 2026.” https://volroc.ai/prediction-markets/2026-06-05/
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