On June 16, 2026, VolRoc recorded 102,339 active prediction markets across Kalshi and Polymarket, holding $1.93B in combined open interest. Day over day, active markets fell 13.9% and open interest fell 1.0% (vs June 15, 2026). Sports was the largest domain by open interest (47%), ahead of Politics & Elections (20%); together they accounted for 67% of all open interest. Kalshi carried 92% of active markets and Polymarket 8%.
Deterministic · template v1 · 2026-06-16
As of 2026-06-16 · 00:00 UTC
Active Markets
102,339
00:00 UTC freeze
Open Interest
$1.93B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
15,867
with trading activity
Kalshi / Polymarket
92% / 8%
by active-market count
Domain Composition — 12 domains
Sports
64,880
Mixed / Multi-category
14,403
Other
12,249
Politics & Elections
5,538
Entertainment & Culture
2,117
Crypto & Digital Assets
1,032
Economics & Inflation
698
Companies & Business
422
Monetary Policy
397
Technology & AI
287
World & Geopolitics
159
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 = 102,339.
Largest Kalshi Series
Sports — multi-game parlays
52,858
Cross-category multi-markets
14,403
Music — artist streams
853
Midterm control
744
U.S. House races
600
Wctotal
302
Wcstageofelim
270
Nextteamnba
257
NFL — next team moves
252
Wcteamtotal
249
California primaries
236
Primary vote shares
203
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 16, 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 16, 2026.” https://volroc.ai/prediction-markets/2026-06-16/
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