Prediction markets were May's breakout theme — but the story that mattered wasn't volume, it was jurisdiction. In a single month, the CFTC moved to claim regulated prediction markets as federal futures while the SEC stalled two dozen related ETFs and a widening list of states and foreign regulators moved to shut them down. The bull case and the existential risk arrived at the same time, which is exactly why the cross-source read on the sector landed neutral rather than euphoric: the same calendar that legitimized these venues also put their right to operate on trial.
The CFTC's claim
The clearest throughline of the month was a federal regulator planting a flag. The CFTC sued Minnesota over its prediction-market ban [1], filed in support of Kalshi in an Ohio dispute [2], and granted no-action relief that let a regulated market operate [3]. It moved to streamline prediction-market rules after fielding more than 1,500 comments on its rulemaking [4][5], and it reaffirmed jurisdiction in a Sixth Circuit brief [6]. The capstone was approval of the first Bitcoin perpetual futures on Kalshi — a first-of-its-kind endorsement that, our sources noted, frames these venues as regulated financial infrastructure rather than novelty [7]. The White House was reported to be reviewing the CFTC's prediction-market rulemaking with administration backing [8].
The SEC's hesitation
The other federal agency pulled the opposite way. The SEC delayed roughly two dozen prediction-market ETFs set for a near-term debut [9][10], a move flagged across publications and by an ETF-focused insider as a brake on the institutional on-ramp [11]. The split-screen — one regulator approving perpetuals while another stalls fund wrappers — is the cleanest illustration of how unsettled the sector's federal status remains [7][10].
The bans
While Washington argued over how to regulate, others moved to prohibit. Minnesota became the first US state to ban prediction markets outright, prompting an immediate federal suit and a separate challenge from Kalshi [12][13]. Abroad, Spain blocked the two largest event-trading platforms for operating without licenses [14] and Indonesia blocked a leading venue on gambling-law grounds [15]. Domestically, two of the largest platforms lost legal bids to halt gambling cases in Nevada and Washington [16]. The pattern across May: federal legitimization and sub-federal prohibition advancing in parallel.
Integrity questions
The month also surfaced the sector's governance gap. A House Oversight committee opened a probe into insider trading on the two largest platforms [17], and a Google engineer was charged in a $2.75M insider-trading case tied to a leading event-trading venue [18]. In response, the CFTC and the NHL signed a data-sharing MOU aimed at safeguarding sports-related prediction markets [19][20], and one venue addressed a suspected exploit of a UMA oracle adapter on Polygon [21]. These are the integrity problems that arrive once a market is large enough to be worth gaming.
Institutionalization, in the same breath
Underneath the legal noise, the sector kept maturing. Market maker Wintermute began providing liquidity to the leading prediction-market venues [22][23], Hyperliquid launched validator-governed prediction markets [24], and a major platform extended into markets for private-company IPOs and valuations [25] and named an executive to lead a Japan expansion [26]. Gemini reported prediction-market metrics alongside 42% revenue growth [27], and esports reportedly grew to 27% of one platform's sports volume [28]. To raise its policy profile, Kalshi launched an advocacy group, Americans for Fair Markets, to promote prediction markets [29].
The open questions
May leaves the sector at a fork: a federal regulator treating these venues as legitimate futures markets, a second federal regulator withholding the ETF wrapper, and a growing list of states and countries trying to close them. Whether the CFTC's jurisdictional claim holds in court [1][6], and whether the integrity probes reshape how these markets police themselves [17][19], will decide if May was the month prediction markets graduated — or the month their growing pains went public.
