On June 12, 2026, VolRoc recorded 127,649 active prediction markets across Kalshi and Polymarket, holding $1.80B in combined open interest. Day over day, active markets fell 6.0% and open interest rose 89.0% (vs June 11, 2026). Sports was the largest domain by open interest (51%), ahead of Politics & Elections (22%); together they accounted for 73% of all open interest. Kalshi carried 93% of active markets and Polymarket 7%.
Deterministic · template v1 · 2026-06-12
As of 2026-06-12 · 00:00 UTC
Active Markets
127,649
00:00 UTC freeze
Open Interest
$1.80B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
15,469
with trading activity
Kalshi / Polymarket
93% / 7%
by active-market count
Domain Composition — 12 domains
Sports
84,290
Mixed / Multi-category
20,126
Other
12,407
Politics & Elections
5,577
Entertainment & Culture
2,155
Crypto & Digital Assets
983
Economics & Inflation
656
Companies & Business
466
Monetary Policy
387
Technology & AI
281
World & Geopolitics
153
Science & Health
88
Climate & Weather
80
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 = 127,649.
Largest Kalshi Series
Sports — multi-game parlays
72,697
Cross-category multi-markets
20,126
Music — artist streams
857
Midterm control
734
U.S. House races
599
Pgatour
272
California primaries
253
NFL — next team moves
250
Wcstageofelim
247
Wctotal
244
Primary vote shares
222
Nextteamnba
217
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 12, 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 12, 2026.” https://volroc.ai/prediction-markets/2026-06-12/
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