On June 19, 2026, VolRoc recorded 143,200 active prediction markets across Kalshi and Polymarket, holding $2.15B in combined open interest. Day over day, active markets rose 18.8% and open interest rose 5.3% (vs June 18, 2026). Sports was the largest domain by open interest (55%), ahead of Politics & Elections (17%); together they accounted for 72% of all open interest. Kalshi carried 99% of active markets and Polymarket 1%.
Deterministic · template v1 · 2026-06-19
As of 2026-06-19 · 00:00 UTC
Active Markets
143,200
00:00 UTC freeze
Open Interest
$2.15B
Kalshi OI + Polymarket liquidity
Markets Traded · 24h
44,101
with trading activity
Kalshi / Polymarket
99% / 1%
by active-market count
Domain Composition — 12 domains
Sports
103,719
Mixed / Multi-category
20,582
Other
11,006
Politics & Elections
3,773
Entertainment & Culture
2,107
Crypto & Digital Assets
564
Economics & Inflation
550
Companies & Business
302
Monetary Policy
269
Technology & AI
149
Climate & Weather
82
World & Geopolitics
66
Science & Health
31
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 = 143,200.
Largest Kalshi Series
Sports — multi-game parlays
93,397
Cross-category multi-markets
20,582
Music — artist streams
822
Midterm control
753
U.S. House races
607
Wcstageofelim
284
Nextteamnba
268
Wctotal
259
NFL — next team moves
253
California primaries
234
Primarymov
205
Wcteamtotal
199
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 19, 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 19, 2026.” https://volroc.ai/prediction-markets/2026-06-19/
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