On June 11, 2026, VolRoc recorded 135,777 active prediction markets across Kalshi and Polymarket, holding $954.5M in combined open interest. Day over day, active markets rose 15.0% and open interest fell 40.1% (vs June 10, 2026). Sports was the largest domain by open interest (67%), ahead of Politics & Elections (22%); together they accounted for 89% of all open interest. Kalshi carried 94% of active markets and Polymarket 6%.
Deterministic · template v1 · 2026-06-11
As of 2026-06-11 · 00:00 UTC
Active Markets
135,777
00:00 UTC freeze
Open Interest
$954.5M
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
8,470
with trading activity
Kalshi / Polymarket
94% / 6%
by active-market count
Domain Composition — 12 domains
Sports
103,481
Mixed / Multi-category
23,765
Other
3,771
Politics & Elections
2,714
Crypto & Digital Assets
868
Companies & Business
281
Technology & AI
235
Economics & Inflation
209
Entertainment & Culture
201
World & Geopolitics
141
Monetary Policy
70
Science & Health
36
Climate & Weather
5
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 = 135,777.
Largest Kalshi Series
Sports — multi-game parlays
97,775
Cross-category multi-markets
23,765
Mlbhr
214
Wctotal
194
Pgatour
162
Mlbhit
162
Mlbtotal
139
Mlbhrr
138
Mlbtb
126
Wcspread
121
Btcd
118
KXPGATOP20
117
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 11, 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 11, 2026.” https://volroc.ai/prediction-markets/2026-06-11/
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