MSCI rebalances move trillions of dollars in passive flows. The full MSCI rebalance dates 2026 calendar is below, along with what changes each quarter, how to position, and the academic research on whether trading around rebalances actually works.
MSCI 2026 Rebalance Calendar
MSCI Global Investable Market Indexes rebalance quarterly. The 2026 dates:
Q1 2026: February Rebalance
- Announcement: February 10, 2026 (preview changes published)
- Effective: February 27, 2026 (close of trading)
- Focus: full-year review of country and sector classifications, free-float adjustments, additions and deletions
Q2 2026: May Rebalance
- Announcement: May 12, 2026
- Effective: May 29, 2026 (close of trading)
- Focus: full Q2 review, including the semi-annual index review of size segments
Q3 2026: August Rebalance
- Announcement: August 11, 2026
- Effective: August 31, 2026 (close of trading)
- Focus: full Q3 review, mid-year country classification updates
Q4 2026: November Rebalance
- Announcement: November 10, 2026
- Effective: November 30, 2026 (close of trading)
- Focus: full Q4 review, including the second semi-annual index review and free-float updates
Which MSCI Indexes Rebalance
Not every MSCI index rebalances quarterly. The big ones that do:
- MSCI ACWI (All Country World Index): $60T+ tracked. Quarterly rebalance, semi-annual full review.
- MSCI World: developed markets only, $50T+ tracked. Quarterly.
- MSCI Emerging Markets: $8T+ tracked. Quarterly.
- MSCI EAFE (Europe, Australasia, Far East): $2T+ tracked. Quarterly.
- MSCI Europe: $1.5T+ tracked. Quarterly.
- MSCI Japan, MSCI USA, MSCI EM Latin America: each has its own schedule but quarterly is standard.
MSCI also runs thematic indexes (MSCI World ESG, MSCI Climate Paris Aligned, MSCI Growth, MSCI Value) that rebalance semi-annually in May and November.
What Changes During an MSCI Rebalance
Each quarterly rebalance does four things:
1. Adds and Deletes Companies
MSCI evaluates every company in its investable universe. Companies meeting the size, liquidity, and free-float thresholds are added. Companies falling below are deleted. Additions typically outnumber deletions in growing markets.
2. Adjusts Country Weights
As countries grow or shrink relative to others, their weight in MSCI ACWI or MSCI EM shifts. China has gained 5+ percentage points of weight in MSCI EM over the past decade. India has gained 4+ points. Korea, Taiwan, and Brazil have all lost weight.
3. Updates Sector Classifications
Companies get reclassified when their business mix changes. Tesla moved from Consumer Discretionary to Tech-Infra in some indexes. Facebook (Meta) stayed in Communication Services after the 2018 GICS reclassification.
4. Adjusts Free-Float and Foreign Ownership
Free-float (the share of stock available to foreign investors) changes over time. MSCI updates these factors each rebalance, which can shift a stock's weight even if the company itself doesn't change.
How Much Money Moves on Rebalance Days
The flows are staggering. MSCI ACWI alone has $60T+ in tracking assets. On a rebalance day, every index fund tracking ACWI must buy the additions and sell the deletions. Even a small percentage of $60T is billions of dollars in trade flow.
The price impact is real. Academic research by Barclays, MSCI, and various universities shows:
- Additions: outperform the index by 1-3% in the 5 days before and 5 days after the rebalance
- Deletions: underperform by 1-2% over the same window
- Subsequent 30 days: additions mean-revert, often giving back the outperformance
Translation: there's a real, tradeable pattern, but it requires execution. Most retail traders can't front-run it profitably.
Can You Trade Around MSCI Rebalances?
Theoretically yes, practically no. Here's the math:
The Trade
- Wait for MSCI to announce the additions (e.g., February 10)
- Buy the additions before the effective date (February 27)
- Sell at or shortly after the rebalance
The Reality
- The announcement date is the entry point. Most retail traders see the news 1-3 days late.
- Professional traders and quant funds are already positioned before the announcement.
- Slippage and commissions eat most of the 1-3% gain.
- The mean reversion in the 30 days after often wipes out the gain.
What Actually Works
Long-term holders can do one thing: avoid the additions right before the rebalance, then add them 30-60 days after, when the price has come back to fundamentals. This is a slow strategy, not a trade.
2026 Expected Additions and Deletions
MSCI doesn't preview additions more than 2-3 weeks before. But based on the May 2025 index review and current market caps, likely 2026 candidates include:
Possible MSCI EM Additions (Q1-Q2 2026)
- Indian private-sector banks (HDFC, ICICI, Kotak) for weight increases as India grows
- Vietnamese and Indonesian companies as frontier market graduates
- Saudi Arabian and UAE companies as MSCI continues EM inclusion
Possible MSCI EM Deletions (Q1-Q2 2026)
- Russian companies remain excluded (post-2022 invasion)
- Some smaller Korean and Taiwanese companies that fell below size thresholds
- Turkish companies if lira volatility continues
Possible MSCI World Additions
- IPO graduates from 2025 (Reddit, StubHub, ServiceTitan if they hit thresholds)
- Israeli companies as MSCI continues to add Tel Aviv listings
Note: these are educated guesses based on public size and liquidity data. MSCI's actual decisions depend on internal methodology that's not published in advance.
How Index Funds Trade the Rebalance
Here's how a $50B ETF tracking MSCI ACWI handles a rebalance:
- Pre-announcement (T-21 days): portfolio managers run optimization models to minimize tracking error. They start pre-positioning.
- Announcement day: full list of additions/deletions is public. ETFs confirm the trades needed.
- T-1 to T-3: ETFs start trading to align with the new index. Some use in-kind creations, some use cash markets.
- Effective day (close): ETFs must hold the new index composition by market close. Final trades execute.
- T+1: any residual tracking error is corrected. ETFs are fully aligned with the new index.
The bulk of trading happens in the last 2-3 days before the effective date. That's when retail traders see the most volatility in the additions and deletions.
Other 2026 Index Rebalances to Watch
MSCI isn't the only major rebalance. Add these to your calendar:
S&P Dow Jones Indices
- S&P 500: rebalances quarterly (March, June, September, December) plus ad-hoc additions/deletions
- S&P MidCap 400, S&P SmallCap 600: quarterly rebalances, same schedule
- S&P/TSX (Canada): quarterly rebalances aligned with S&P
FTSE Russell
- FTSE Russell Global Index: annual rebalance in September (the big one), plus quarterly updates
- Russell 2000, Russell 1000: annual reconstitution in June (one of the largest single trading events of the year)
Bloomberg Barclays / Bloomberg Indices
- Bloomberg US Aggregate Bond Index: monthly rebalance
- Bloomberg Commodity Index (BCOM): annual rebalance in January, with weight adjustments rolling throughout the year
Final Word
MSCI rebalance dates 2026 are concentrated in four predictable windows: late February, late May, late August, and late November. The price impact is real, the academic evidence is strong, and the flows are massive. Whether you trade them is a different question. For most investors, the right move is to own a low-cost MSCI ETF and rebalance annually, not to try to time the quarterly rebalances. For the few who want to trade them, focus on additions 30-60 days after the effective date, when mean reversion has done its work and the price is closer to fundamentals.