Deep Fission IPO Closing Market Cap: Which Range Wins?

Deep Fission’s public debut resolves today, and the prediction market has settled on the $1.5 billion to $1.75 billion range as the most probable closing valuation. With resolution set for 16:00 on May 29, 2026, the contract prices that band at 57 cents on the dollar, implying a 57% probability. Six alternative outcomes compete for the remaining 43%, from a sub-$1.25 billion disappointment to a $3.0 billion-plus blowout. The data tells a clear story: the market treats the middle band as the modal outcome while leaving meaningful probability mass across the tails.

The market question asks which valuation range Deep Fission closes within on its IPO date. The YES contract on the $1.5B–$1.75B band trades at $0.57, while the aggregate NO position sits at $0.43. Total volume across the contract stands at $1,451, with $1,048 of that trading in the past 24 hours. The contract resolves at 16:00 today.

How the Deep Fission IPO Valuation Contract Works

This contract resolves YES if Deep Fission’s closing market capitalization on its IPO date falls between $1.5 billion and $1.75 billion, as determined by the closing share price multiplied by total shares outstanding. The resolution source is market resolution, meaning the official closing price from the exchange where Deep Fission lists will determine the outcome. All other price ranges resolve as NO for this specific contract.

• YES ($1.5B–$1.75B closing cap): $0.57, implying a 57% probability.
• NO (any other closing range): $0.43, implying a 43% probability.

A NO payout occurs whenever Deep Fission closes outside the $1.5 billion to $1.75 billion band. That means a stronger-than-expected debut above $1.75 billion, a softer open that closes below $1.5 billion, or a delayed IPO altogether would each trigger a NO resolution. The alternative outcome brackets cover ranges from below $1.25 billion up through $3.0 billion and above, as well as a no-IPO outcome before August 2026.

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Market Signals and Trading Conviction

The momentum composite for this contract shows a flat 1-hour change of 0.0%, a 24-hour decline of 6.0%, and a trend score of 43.39 out of 100. Together, these signals indicate mild selling pressure on the $1.5B–$1.75B band heading into resolution. The most likely catalyst is same-day IPO pricing information: as underwriters set the final offer price and early trading data emerges, probability mass is redistributing across the valuation bands.

Total volume of $1,451 and 24-hour volume of $1,048 against liquidity of $8,922 confirm this is an exceptionally thin market. Within the confidence interval of a well-functioning prediction market, thin volume limits the reliability of any price signal. A single large trade could move this contract materially before the 16:00 close. The historical base rate suggests that low-volume IPO valuation markets carry higher variance around resolution than their implied probabilities would indicate.

• The YES contract on $1.5B–$1.75B has declined 6 percentage points in the past 24 hours, suggesting some traders moved probability toward adjacent bands.
• The 1-hour price change is flat at 0.0%, meaning the selling pressure has decelerated but not reversed entering the final hours.
• Liquidity of $8,922 is thin enough that price discovery depends on a small number of informed participants with access to IPO allocation data or early trading prints.
• The trend score of 43.39 confirms below-average directional conviction, consistent with genuine uncertainty about which valuation band captures the close.
• Related markets show 100% probability on adjacent company-size questions, suggesting broader market participants are tracking Deep Fission’s overall scale rather than the precise valuation band.

Lines Analysis: Deep Fission IPO Valuation

The $1.5B–$1.75B range holds majority probability for defensible structural reasons. Nuclear technology startups and small modular reactor developers have priced IPOs in this range when they carry pre-revenue or early-revenue profiles but possess strong IP portfolios and government contract pipelines. A midpoint of roughly $1.625 billion represents a valuation that institutional allocators can underwrite without requiring near-term commercial revenue. If Deep Fission’s bookbuild attracted participation from energy-transition funds and defense-adjacent investors, the $1.5B–$1.75B band is where consensus pricing would naturally land.

The adjacent $1.75B–$2.0B band at meaningful probability and the $1.25B–$1.5B band below it represent the most credible alternative scenarios. Closing above $1.75 billion requires first-day retail enthusiasm or a late bookbuild oversubscription that pushed the offer price to the top of the range. Closing below $1.5 billion would reflect a pulled or repriced offering, a market-wide risk-off move on May 29, or weaker-than-expected institutional demand during the roadshow. Either scenario would resolve this contract as NO.

Signals to monitor before the 16:00 close:

• Deep Fission’s opening trade price on its listing exchange will immediately reveal whether the $1.5B–$1.75B band is in play or has been superseded by a stronger or weaker debut.
• Broad equity market conditions on May 29, 2026, particularly in the energy and technology sectors, will anchor first-day trading range for any newly public issuer.
• Any news of underwriter stabilization activity (buying below the offer price) would signal a close below $1.5 billion, shifting probability decisively toward NO.
• First-hour trading volume on the IPO itself serves as a conviction signal: heavy retail participation tends to push first-day closes above the institutional offer price range.
• The no-IPO outcome remains on the board, and any delay announcement before 16:00 would collapse the YES probability immediately.

Total volume of $1,451 on this contract is insufficient for high statistical confidence. The data tells a clear story that market participants with direct IPO information have not engaged this contract at scale, leaving the 57% price as a rough prior rather than a sharp posterior estimate. The $1.5B–$1.75B band holds the plurality of probability, but the thinness of this market means that outcome should be treated as the modal guess, not a settled consensus.

LINES VERDICT

Plurality Favored, Low Conviction

The $1.5B–$1.75B band holds the strongest single-range probability among all outcomes, but a 6% decline in 24 hours and extremely thin volume mean the market’s confidence is limited. The historical base rate for thin IPO valuation markets suggests wide outcome dispersion around any modal estimate.

What the market says: At 57% implied probability with resolution today at 16:00, the market assigns the $1.5B–$1.75B band a narrow majority. With only $1,451 in total volume and the contract closing in hours, any IPO trading data that deviates from that range will move the price sharply before resolution.

Economic and Market Context

Nuclear energy companies have attracted significant investor attention through 2025 and into 2026, driven by AI data center power demand and energy security mandates from government procurement programs. Small modular reactor developers and deep borehole nuclear technology firms have benefited from both venture capital inflows and a renewed public market appetite for energy infrastructure plays. This backdrop supports an IPO window for a company like Deep Fission and makes the $1.5B–$1.75B range plausible relative to sector comps.

The broader IPO market in mid-2026 has shown selective demand: issuers with clear federal contract pipelines or proprietary technology licensing have priced at or above range, while pure-development-stage companies have seen first-day underperformance. Deep Fission’s ultimate closing cap will reflect both its specific bookbuild outcome and the sector risk appetite present on its listing date. The nearest catalysts before 16:00 are the opening print and first-hour trading volume on the IPO itself.

What is a prediction market implied probability?

A $0.57 YES price means the market assigns a 57% probability that Deep Fission closes within the $1.5B–$1.75B valuation range. It is not a guaranteed outcome and shifts as new information emerges.

What does the NO contract represent here?

The NO contract pays out if Deep Fission closes in any range other than $1.5B–$1.75B, including above $1.75B, below $1.5B, or if the IPO does not occur before August 2026. At $0.43, the market assigns a 43% combined probability to all those alternatives.

What moves the price of this contract?

The IPO’s opening trade, first-hour volume, and any underwriter stabilization activity are the primary catalysts. Broad equity market conditions on May 29 and any late IPO-related announcements also affect the probability distribution across all valuation bands.

When and how does this contract resolve?

The contract resolves at 16:00 on May 29, 2026, based on Deep Fission’s official closing market capitalization as determined by its listing exchange. The resolution source is market resolution using the closing price and shares outstanding.

How reliable is the volume signal here?

Total volume of $1,451 is extremely thin. Within the confidence interval of prediction market research, low-volume contracts carry higher variance around resolution. The 57% price reflects a weak prior rather than an informed consensus, and a single informed trade before 16:00 could shift the probability materially.