Largest Company end of May?

Platform comparison

Active sub-markets

Market context

The market is asking which listed company will have the highest market capitalisation at the close on 31 May 2026, and the crowd is heavily positioned towards NVIDIA at 98%. That is consistent with the recent pattern in comparable Polymarket books: the same contract for the end of May has already sat near 98% for NVIDIA, while the end-December 2026 version is much less certain, with NVIDIA around 66% and Alphabet near 20%. In other words, traders are comfortable treating NVIDIA as the front-runner over days and weeks, but less so over a longer horizon where valuation swings, earnings, and index rotation matter more. Compared with Kalshi or Smarkets, Polymarket typically shows direct implied probabilities, while those venues more often present decimal odds; all three can therefore look different even when the underlying view is the same, especially once fees, spreads, and access limits are taken into account.

For the final week of May, the main variables are NVIDIA’s market cap relative to Alphabet, Apple, and Microsoft, plus any move that changes big-tech valuations more broadly. Recent reporting has put NVIDIA above $5 trillion in market value, with Alphabet, Apple, and Microsoft still several hundred billion dollars behind, so the gap would need to narrow materially for the lead to change. Traders should watch any earnings-related guidance, hyperscaler spending updates, and Treasury-yield moves, because higher discount rates can pressure long-duration growth multiples across the sector. On a platform-comparison basis, Polymarket’s crowd prices are transparent and fast-moving, while Betfair and Smarkets usually quote exchange-style odds that embed commission and may be less directly readable as probability. KYC and geographic availability also differ: Polymarket access is broader via crypto rails, whereas regulated books usually have stricter onboarding and jurisdiction checks.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Largest Company end of May? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.