Which companies added to S&P 500 in Q4 2026?

Polymarket Closes Dec 31 · $19.0K traded · prices read 2 min ago

The odds

49%Astera Labs (ALAB)
S&P 500 now 7,353.73 −4.36%
  • Astera Labs (ALAB)49%▲ 23
  • Cheniere Energy (LNG)49%▲ 10
  • Rocket Companies (RKT)42%
  • SoFi Technologies (SOFI)34%▼ 5
  • MongoDB (MDB)25%▲ 2
  • Credo Technology (CRDO)21%▼ 8
  • Alnylam Pharmaceuticals (ALNY)16%▲ 2
  • HEICO (HEI)12%▼ 1
  • Affirm Holdings (AFRM)7%▼ 6
  • Medline (MDLN)6%▲ 1
  • Strategy (MicroStrategy) (MSTR)2%

How the odds have moved

Astera Labs (ALAB): 31% on Oct 28, 49% now.

Each outcome's chance over time, from its prices on Polymarket.

Every outcome

Outcome Chance Day Bid Ask Traded
✓ Okta (OKTA) >99% ▲ 53 100¢ 100¢ $2.7K
Astera Labs (ALAB) 49% ▲ 23 27¢ 71¢ $768
Cheniere Energy (LNG) 49% ▲ 10 15¢ 82¢ $2.2K
Rocket Companies (RKT) 42% 13¢ 71¢ $1.7K
SoFi Technologies (SOFI) 34% ▼ 5 11¢ 56¢ $2.0K
MongoDB (MDB) 25% ▲ 2 10¢ 39¢ $554
Credo Technology (CRDO) 21% ▼ 8 12¢ 29¢ $2.0K
Alnylam Pharmaceuticals (ALNY) 16% ▲ 2 10¢ 21¢ $1.8K
HEICO (HEI) 12% ▼ 1 10¢ 14¢ $868
Affirm Holdings (AFRM) 7% ▼ 6 3¢ 10¢ $1.1K
Medline (MDLN) 6% ▲ 1 4¢ 8¢ $1.5K
Strategy (MicroStrategy) (MSTR) 2% 1¢ 4¢ $1.7K

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