Kalshi and Polymarket have moved to impose broader restrictions on users with privileged access, tightening rules around who can trade on politically sensitive, sports-related and outcome-influencing contracts. The policy shift marks a clear effort to reduce insider-risk exposure and strengthen market-integrity safeguards across both platforms.
The new measures go beyond general compliance language and introduce visible enforcement consequences. Reported sanctions now include penalties such as a five-year trading ban and a tenfold fine for a candidate, along with a two-year ban and a fivefold penalty for a company insider.
Today, we’re announcing an expansion of our efforts to prevent insider trading on Kalshi – new guardrails and policies to preemptively block politicians and athletes from trading in certain politics and sports markets.
These efforts, which have been in the works for months,…
— robertjdenault (@robertjdenault) March 23, 2026
Platforms Narrow Access to Insider-Sensitive Markets
Kalshi, which operates under CFTC oversight, updated its rules to prohibit political candidates from trading on their own races and to prevent athletes and sports employees from trading on contracts tied to their sports. The revised framework shows Kalshi is tightening restrictions in areas where direct influence over outcomes creates an obvious integrity risk.
Kalshi’s leadership presented the changes as an extension of controls already in place rather than a complete redesign of its compliance model. The company used prior enforcement examples to signal that these restrictions are backed by meaningful penalties rather than symbolic policy language.
Polymarket adopted a broader formulation that bars trading by anyone who holds confidential information or can materially affect an event’s outcome. That standard extends beyond athletes and candidates to include company officials, policymakers and other actors whose influence could distort market fairness.
Polymarket’s legal team framed the update as a direct clarification of expectations for all participants. The platform is making clear that access to certain markets will now depend not only on user identity, but also on whether a person’s role creates informational or outcome-based conflicts.
Product Design and User Flows Now Have to Adapt
The rule changes also reshape the product experience in practical ways. By removing or restricting insider-sensitive contracts, both platforms are narrowing the set of markets users can discover and trade.
That has direct consequences for onboarding and account controls. Additional identity checks and stronger permissioning logic are now necessary to stop conflicted users from accessing restricted markets in the first place.
The trading and dispute experience is also becoming more structured. Platforms now need clearer explanations for market removals, account restrictions and blocked trades so users do not encounter silent failures or unclear rejection flows.
Compliance Pressure Is Now Driving Product Decisions
The timing of the changes suggests both companies are trying to get ahead of a tougher regulatory environment. The new restrictions appear designed to show policymakers and regulators that the platforms are willing to narrow their own product surface before external intervention forces deeper limits.
That context matters because a bipartisan legislative push is already building around prediction markets tied to sports and other sensitive outcomes. By tightening access rules now, Kalshi and Polymarket are signaling that market integrity and compliance architecture will play a larger role in how these products are designed and governed going forward.
Restricted markets now require stronger audit trails, more explicit permission flags and clearer user-facing messaging so the impact on conversion, support demand and enforcement response can be measured and managed.