The Three Candidates
Five Fitness Criteria
Criterion 1
IPO Accessibility
Capture post-IPO companies four times during the year, with no arbitrary waiting period.
Requires 12+ months of trading history AND 4 consecutive quarters of positive GAAP earnings. A capital-efficient, scaled business that went public last quarter is deliberately excluded.
CoreWeave IPO'd Mar 2025 → ineligible until 2026+ per S&P rules.
Adds IPOs quarterly with no profitability gate. However, the annual June reconstitution is the primary event driving membership. Companies that IPO mid-year may wait up to 12 months for full index recognition.
Post-June-2025 IPOs await June 2026 reconstitution.
Full quarterly reconstitution. No seasoning. No profitability requirement. A company that achieves sufficient free float market cap is eligible at the next quarterly review.
CoreWeave, Chime, Circle, Figma already in May 2026 rebalance.
Criterion 2
Investable Capital
Determine company weightings by value actually available to investors.
Uses free float for weighting within the index. However, committee selection is influenced by total market cap for size-tier placement. The S&P 500/400/600 boundaries are not strictly free-float-based.
A heavily insider-owned company may fall into the wrong tier.
Ranks all eligible companies by total market capitalization, not free float. A company with 70% insider lock-up gets the same ranking weight as a fully-floating company of the same total size. This overstates investable opportunity.
High-insider-ownership IPOs rank higher than their float justifies.
Uses free float market capitalization for both the ranking that determines capitalization-tier placement AND the threshold that defines the 1500 boundary. The universe is defined by investable capital only.
Newly public companies ranked only on their free float.
Criterion 3
Economic Geography
Include companies with a primary listing on U.S. exchanges and U.S. economic exposure, regardless of where they are incorporated.
Uses US incorporation as a primary eligibility test. Companies like NXP Semiconductors, Spotify, CRH, Smurfit WestRock, and Schlumberger - all NYSE/Nasdaq-primary, economically US-facing - are excluded based on domicile.
NXP Semiconductors (Dutch) · Spotify (Luxembourg) · CRH (Irish) → excluded.
Requires US incorporation or US primary listing with US headquarters. The same set of foreign-incorporated, US-listed companies that S&P excludes are also excluded here. Both indexes apply essentially the same geography test.
Similar exclusions as S&P on foreign-incorporated companies.
Assigns country using a composite of primary listing, country of domicile, and country of risk. NYSE-primary-listed companies with US economic exposure qualify regardless of legal incorporation jurisdiction. Captures the actual investable US market.
NXP Semiconductors · AerCap · Spotify · CRH · Schlumberger → all eligible.
Criterion 4
Rules-Based Transparency
Base universe must be transparent and rules-based. No committee discretion or subjective judgment.
The S&P Index Committee makes final discretionary decisions on all additions and removals. A company can meet all published criteria and still be excluded - or vice versa. The committee can and does override mechanical rules at will.
Tesla waited years despite meeting published criteria.
Fully rules-based and deterministic. The Russell methodology applies its criteria mechanically - if you meet the criteria, you're in. No committee, no discretion, no surprises. Any company meeting size and float requirements is included.
No committee discretion - mechanics determine membership.
Fully rules-based. The guideline explicitly states: "The determination of the Index Universe is fully rule-based and the Index Administrator cannot make any discretionary decisions." The base universe is transparent and predictable.
Guideline §2.1: no discretionary decisions permitted.
Criterion 5
Architectural Clarity
Universe membership must answer only one key question: Is this company large enough and investable? Quality is a separate filter.
Bakes profitability into the universe definition. A company cannot enter, regardless of size, unless it has four consecutive quarters of GAAP earnings. This conflates "investable" with "profitable".
Universe definition = size + profitability + committee approval.
Universe is pure size. No quality baked in, which is correct. However, the top 1,500 of Russell 3,000 is not a published product. The full Russell 3,000 includes 2,000 small companies, which places a large weight on the increasingly unproductive market.
No Russell 1500 exists as a published, licensed index.
Universe = free float market cap only. Zero quality criteria baked in. This enables a clean two-layer architecture: Layer 1 (universe) answers "investable and large enough?" Subsequent Quality Gate screens for company quality.
Subsequent Quality Gate screens for company quality.
Russell Top 1500 Score
2.5 / 5
Solactive GBS US 1500 Score
5 / 5
Three Companies - How Each Universe Handles Them
CoreWeave Inc.
AI cloud infrastructure · IPO March 2025 · ~$40B market cap
S&P 1500
Excluded. No GAAP profitability yet. Must wait 12+ months and achieve 4 profitable quarters.
Russell 1500
Eligible for quarterly IPO addition, but full weight recognition awaits June 2026 annual reconstitution.
Solactive
✓
Added at the first quarterly rebalance after its IPO, weighted by its free float market cap.
NXP Semiconductors / Spotify
Dutch / Luxembourg incorporated · Nasdaq / NYSE primary listing
S&P 1500
Excluded. Foreign incorporation disqualifies regardless of primary US listing or economic exposure.
Russell 1500
Excluded. Same US-incorporation requirement applies. Both companies are out of the Russell US universe.
Solactive
✓
Eligible. Primary listing + country of risk logic classifies both as US market participants. Both confirmed in the May 2026 constituent list.
Rivian Automotive
EV manufacturer · IPO Nov 2021 · Capital-destructive · ~$15B market cap
S&P 1500
Excluded - but for the wrong reason. No GAAP profits, not because it destroys capital on an economic basis.
Russell 1500
Included. Market cap clears the threshold. No quality filter exists at the universe level. Rivian gets full index weight.
Solactive
✓
Admitted to the base universe (free float market cap qualifies). It is subsequently excluded by our Quality Gate before final index construction.
Next Step
