Will Missouri’s Abortion and Minor Gender Ban Pass in 2026?

Missouri Amendment 3 carries a paradox at its core. Voters legalized abortion in Missouri just two years ago. Now Republican lawmakers are asking those same voters to reverse that decision. The prediction market has already answered: YES sits at 14.5 cents, putting passage probability at just 14.5 percent. That is not a close call. That is a market telling you the math is brutal for backers of this ban.

The market question asks whether Missouri Amendment 3, which would ban nearly all abortions and codify a prohibition on gender transition procedures for minors, will pass on November 3, 2026. YES trades at $0.15 and NO at $0.86. Total volume on this contract is $579, with zero dollars traded in the last 24 hours and $40 in available liquidity.

How Missouri Amendment Three Works

Missouri Amendment 3 is a legislatively referred constitutional amendment. Republican lawmakers placed it on the November 3, 2026 ballot. YES means the amendment passes and Missouri reinstates a near-total abortion ban while also constitutionally prohibiting gender transition procedures for minors. NO means Missouri voters reject the amendment and the 2024 reproductive rights protections remain in force. The Missouri secretary of state certifies the result. A simple majority of votes cast determines the outcome.

• YES ($0.15, 14.5% probability): Amendment 3 passes, abortion ban restored, gender transition ban codified in the state constitution.
• NO ($0.86, 85.5% probability): Amendment 3 fails, 2024 abortion rights amendment holds, status quo preserved.

Rejection keeps Missouri’s 2024 amendment alive. Voters approved that amendment narrowly, and the organized opposition that just formed, a coalition called Stop the Ban, argues Republican lawmakers are trying to erase a democratic result. The NO contract pays out if enough Missourians agree.

Market Signals Point to Stalled YES Movement

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Market Signals Favor No, With Little Price Conviction on Either Side

Momentum on Amendment 3 is essentially flat. The 1-hour change sits at 0.0 percent, the 24-hour change at plus 1.0 percent, and the trend score at 5.97. That composite reads as mild deceleration. There is no buying surge. The May 19 move up to a 30-day high was brief and gave back ground. What the price action says: traders are not finding new reasons to load YES.

Total volume is $579. Twenty-four-hour volume is zero. Liquidity is $40. Those numbers place this contract firmly in low-conviction territory. A single news event, a dramatic fundraising announcement or a new poll showing a swing, could move a thin book like this sharply. But right now, neither side is committing capital.

• Amendment 3 YES price sits at $0.15, reflecting 14.5% passage probability as of June 14, 2026.
• The 24-hour price change of plus 1.0% combined with a trend score of 5.97 signals a decelerating rather than accelerating YES move.
• Zero 24-hour volume and $40 liquidity make this one of the thinnest political contracts currently on Polymarket.
• The 30-day range ran from $0.10 to $0.20, showing YES has never sustained momentum above 20 cents.
• Trader sentiment breaks down as 14.5% YES and 85.5% NO, a strongly bearish read on passage.

Lines Analysis: Missouri Amendment Three

The data favors NO and favors it heavily. Missouri voters passed the 2024 abortion rights amendment. Asking those same voters to reverse course inside two years is a structural disadvantage. The Stop the Ban coalition launched formally in late May 2026 with organized fundraising and a clear message: lawmakers are overriding a voter mandate. An early poll found Amendment 3 at 47% support, 40% opposed, with 12% undecided. The math doesn’t lie: a ballot measure needs a majority, and 47% with that much undecided territory is a weak position for backers heading into a general election cycle where abortion consistently drives Democratic turnout.

Amendment 3 closes the gap if Republican enthusiasm outpaces national trends, if the gender transition component pulls persuadable voters who support abortion rights but oppose youth gender care, and if the opposition campaign runs short of money. Critics have called the gender-affirming care ban ballot candy, a rider designed to attract voters who might otherwise reject a straight abortion ban. That framing cuts both ways. It may energize the opposition as much as it motivates the base.

• Amendment 3 fundraising and campaign infrastructure updates before the November 3, 2026 deadline will push price in either direction.
• New polling that narrows the gap below five points between YES and NO would signal a YES repricing above $0.20.
• A Missouri Supreme Court ruling on the existing gender transition ban could reframe the ballot debate and shift undecided voters.
• National abortion rights spending entering Missouri would strengthen the NO position and pressure YES further.
• Turnout modeling for a non-presidential 2026 midterm cycle is the key uncertainty: lower turnout elections tend to favor organized grassroots operations on both sides.

The $579 total volume reflects a market that has made up its mind without a lot of debate. NO holds 85.5% of market sentiment, and the underlying polling, 47% support heading into a general with 12% undecided, does not contradict that read. The data favors NO. The only scenario where this reprices dramatically is a polling shock or a well-funded pro-Amendment-3 push that moves undecideds before November.

LINES VERDICT

Amendment Three Fails

Missouri voters legalized abortion in 2024, and the organized coalition opposing Amendment 3 launched with a voter-mandate argument that resonates precisely because it is accurate. The market has priced this accordingly.

What the market says: At 14.5% implied probability, the market treats Amendment 3 passage as unlikely. With $40 in liquidity and zero 24-hour volume, this price could move sharply on any significant development before the November 3, 2026 resolution date.

Political Context: The 2024 Baseline and the Organized Pushback

Missouri voters approved abortion rights in November 2024 by a narrow margin. Republican legislators responded by referring Amendment 3 to the ballot, pairing the abortion ban with a prohibition on gender transition procedures for minors. Gender-affirming care for minors is already banned in Missouri under existing statute, though a legal challenge is pending before the state supreme court. Adding the gender ban to Amendment 3 was a deliberate strategic choice. Opponents call it ballot candy. Supporters argue it consolidates related values-based policies into a single constitutional question. The Stop the Ban campaign launched May 27, 2026, positioning itself around the voter-mandate argument. The most recent available polling placed Amendment 3 at 47% support, 40% opposition, and 12% undecided. A majority requires crossing 50%. With undecideds historically breaking toward the status quo on abortion measures, NO enters the second half of this campaign with structural momentum.

Before November 3, 2026, the events that would move this market are: a major fundraising disparity emerging between campaigns, a Missouri Supreme Court ruling on the existing gender ban, a national polling shift on abortion following federal legislative action, and September and October surveys that show Amendment 3 either cracking 50% or collapsing below 40%.

What is the implied probability?

At $0.15 for YES, the market implies a 14.5% chance Amendment 3 passes. That means roughly an 85% chance Missouri voters reject the ban on November 3, 2026.

What does the NO contract represent?

The NO contract at $0.86 pays out if Amendment 3 fails, meaning Missouri’s 2024 abortion rights protections remain in place and the constitutional gender transition ban is not enacted.

What moves the Amendment 3 price?

New polls, campaign fundraising announcements, endorsements, and court rulings on related Missouri legislation are the main price catalysts between now and the November 3 resolution date.

When does this market resolve?

This contract resolves November 3, 2026, the date of the Missouri general election ballot vote on Amendment 3.

How reliable is the volume and liquidity data?

Total volume of $579 and liquidity of $40 classify this as a low-activity contract. Prices on thin books are more volatile and less reliable as consensus signals than high-volume markets.