On June 15, 2026, VolRoc recorded 118,887 active prediction markets across Kalshi and Polymarket, holding $1.95B in combined open interest. Day over day, active markets fell 44.6% and open interest fell 7.6% (vs June 14, 2026). Sports was the largest domain by open interest (50%), ahead of Politics & Elections (20%); together they accounted for 69% of all open interest. Kalshi carried 93% of active markets and Polymarket 7%.
Deterministic · template v1 · 2026-06-15
As of 2026-06-15 · 00:00 UTC
Active Markets
118,887
00:00 UTC freeze
Open Interest
$1.95B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
14,521
with trading activity
Kalshi / Polymarket
93% / 7%
by active-market count
Domain Composition — 12 domains
Sports
79,029
Mixed / Multi-category
16,460
Other
12,498
Politics & Elections
5,589
Entertainment & Culture
2,144
Crypto & Digital Assets
1,050
Economics & Inflation
704
Companies & Business
422
Monetary Policy
394
Technology & AI
287
World & Geopolitics
153
Climate & Weather
87
Science & Health
70
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 = 118,887.
Largest Kalshi Series
Sports — multi-game parlays
67,805
Cross-category multi-markets
16,460
Music — artist streams
854
Midterm control
741
U.S. House races
600
Wctotal
310
Wcstageofelim
265
NFL — next team moves
251
Wcteamtotal
250
Nextteamnba
245
California primaries
238
Pgatour
205
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 15, 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 15, 2026.” https://volroc.ai/prediction-markets/2026-06-15/
Get the daily statistics
A short daily read on the prediction-market universe across Kalshi and Polymarket.
Join the list →