PolymarketOtherDevelopingUpdated 8m ago

Will SpaceX be the largest company in the world by market cap on December 31?

As of Oct 12, 2026, 8:07 AM ET, Polymarket priced this market at 0.1% (little changed over 24 hours). It had $27.1K traded in the past 24 hours, $162.5K of order-book liquidity and a bid-ask spread of 0.1 pts. probcast.co rates the support behind this price as moderate.

Market probability
0.1%
Little changed over 24 hours

Thin market where small orders can move the price, with broad trading across many accounts.

Price historyPolymarket

Source: Polymarket price history

How credible was the move?

Methodology →

Move validity

Moderate

Consensus stability

Stable

Contract clarity

High

Can you trust this price?

Two different questions: how hard the price is to move, and whose trading set it.

Market capacity

How hard is it to move this price?

ThinTight spread

Order-book liquidity

$162.5K

Bid-ask spread

0.1 pts

24h volume

$27.1K

Total volume

$803.2K

It would take roughly $500.1 of buying to move the price up by ~5 pts.

Little money on the book — a modest order can move this price, so treat swings with care.

Who's trading

Whose opinion is this price?

Broad participation
23%of the traded money came from the single largest account

Accounts

80

Trades

200

over 10 days

Largest order

$45.9

$202.9 traded across these 200 trades (last 10 days).

Many independent accounts traded — the price reflects a crowd, not one bettor.

Recent trade activity$202.9 traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

This market will resolve to the largest company in the world by market cap on December 31, 2026, as of market close. The resolution source for this market will be a consensus of credible reporting.

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

This market will resolve to the largest company in the world by market cap on December 31, 2026, as of market close. The resolution source for this market will be a consensus of credible reporting.

What could move this market next?

  • The market's deadline arrivesDecember 31, 2026 at 11:59 PM ET

    The contract must resolve based on what has happened by this date.

Derived from the contract's own mechanics as of Oct 12, 8:16 AM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: low · expected error ±13 pts.

Quote-drivenLegacy movement classifier: watch

What's happening

medium classifier confidence
Quote-driven

A tight, deep, quote-driven book with little executed flow. The price is stable but reflects resting quotes more than active trading.

  • Tight spread on a liquid, calm market
  • Deep, balanced resting book

The latest price is a usable but caveated read — weigh it with the market state.

More details — reliability score, dynamics, durability
Reliability score
58Medium
Where the price path tends to go next492 observed
  • Choppy / mean-reverting93%
  • Stable consensus3%
  • Thin-liquidity spike2%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~4w
PredictabilityStable

Secondary read: leaning toward Trading normally.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Market data

24h volume

$27.1K

Liquidity

$162.5K

Total volume

$803.2K

Category
Other
Venue
Polymarket
Open interest
—
Spread
0.1 pts
Best bid
0.1%
Best ask
0.2%
7-day range
0.1% – 0.1%
Resolves
Dec 31, 2026
Change (pts)1H0.06H0.024H0.07D0.0

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