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← Citadel Advisors LLC, its record

Citadel Advisors LLC and AllianceBernstein LP: where the books meet

At Q2 2026, at least 7.5% of the two 13F books was the same, across 114 stocks both listed, against 17% at Q4 2015. Overlap is the smaller of each shared stock’s two weights, added up: the part of one book that could be swapped for the other’s without a trade.

Overlap by quarter
0%8%17%Q4 2015: 17%, 164 in bothQ1 2016: 16%, 165 in both16Q2 2016: 13%, 141 in bothQ3 2016: 13%, 128 in bothQ4 2016: 13%, 126 in bothQ1 2017: 16%, 147 in both17Q2 2017: 15%, 150 in bothQ3 2017: 15%, 148 in bothQ4 2017: 16%, 158 in bothQ1 2018: 12%, 139 in both18Q2 2018: 12%, 134 in bothQ3 2018: 12%, 144 in bothQ4 2018: 12%, 131 in bothQ1 2019: 10%, 126 in both19Q2 2019: 11%, 132 in bothQ3 2019: 11%, 145 in bothQ4 2019: 11%, 138 in bothQ1 2020: 7.9%, 118 in both20Q2 2020: 6.9%, 103 in bothQ3 2020: 5.8%, 91 in bothQ4 2020: 6.2%, 96 in bothQ1 2021: 5.7%, 94 in both21Q2 2021: 4.5%, 80 in bothQ3 2021: 4.0%, 65 in bothQ4 2021: 3.9%, 71 in bothQ1 2022: 3.5%, 65 in both22Q2 2022: 3.5%, 66 in bothQ3 2022: 4.6%, 82 in bothQ4 2022: 5.3%, 90 in bothQ1 2023: 5.5%, 95 in both23Q2 2023: 5.3%, 94 in bothQ3 2023: 5.7%, 92 in bothQ4 2023: 6.0%, 92 in bothQ1 2024: 5.9%, 94 in both24Q2 2024: 5.4%, 86 in bothQ3 2024: 4.7%, 83 in bothQ4 2024: 5.4%, 102 in bothQ1 2025: 4.9%, 88 in both25Q2 2025: 5.8%, 94 in bothQ3 2025: 5.6%, 90 in bothQ4 2025: 8.0%, 112 in bothQ1 2026: 7.4%, 106 in both26Q2 2026: 7.5%, 114 in both
  • Q4 2015: 17%, 164 in both
  • Q1 2016: 16%, 165 in both
  • Q2 2016: 13%, 141 in both
  • Q3 2016: 13%, 128 in both
  • Q4 2016: 13%, 126 in both
  • Q1 2017: 16%, 147 in both
  • Q2 2017: 15%, 150 in both
  • Q3 2017: 15%, 148 in both
  • Q4 2017: 16%, 158 in both
  • Q1 2018: 12%, 139 in both
  • Q2 2018: 12%, 134 in both
  • Q3 2018: 12%, 144 in both
  • Q4 2018: 12%, 131 in both
  • Q1 2019: 10%, 126 in both
  • Q2 2019: 11%, 132 in both
  • Q3 2019: 11%, 145 in both
  • Q4 2019: 11%, 138 in both
  • Q1 2020: 7.9%, 118 in both
  • Q2 2020: 6.9%, 103 in both
  • Q3 2020: 5.8%, 91 in both
  • Q4 2020: 6.2%, 96 in both
  • Q1 2021: 5.7%, 94 in both
  • Q2 2021: 4.5%, 80 in both
  • Q3 2021: 4.0%, 65 in both
  • Q4 2021: 3.9%, 71 in both
  • Q1 2022: 3.5%, 65 in both
  • Q2 2022: 3.5%, 66 in both
  • Q3 2022: 4.6%, 82 in both
  • Q4 2022: 5.3%, 90 in both
  • Q1 2023: 5.5%, 95 in both
  • Q2 2023: 5.3%, 94 in both
  • Q3 2023: 5.7%, 92 in both
  • Q4 2023: 6.0%, 92 in both
  • Q1 2024: 5.9%, 94 in both
  • Q2 2024: 5.4%, 86 in both
  • Q3 2024: 4.7%, 83 in both
  • Q4 2024: 5.4%, 102 in both
  • Q1 2025: 4.9%, 88 in both
  • Q2 2025: 5.8%, 94 in both
  • Q3 2025: 5.6%, 90 in both
  • Q4 2025: 8.0%, 112 in both
  • Q1 2026: 7.4%, 106 in both
  • Q2 2026: 7.5%, 114 in both

Only quarters both managers filed. Where either filing has more positions than are read each quarter, a stock both hold below that range is not counted, so the figure is a floor.

What the overlap is made of, Q2 2026

Stocks both listed, by the smaller of the two weights. A weight is the stock’s share of that manager’s reported book, which says how large the position is, not how strongly it is held.

StockCitadel Advisors LLCAllianceBernstein LP
iShares Trust(IVV)1.5%Added1.2%Added
Amazon Com Inc(AMZN)0.3%Added2.6%Trimmed
Nvidia Corp(NVDA)0.3%Trimmed5.6%Trimmed
Apple Inc(AAPL)0.2%Added3.6%Added
Microsoft Corp(MSFT)0.2%Added3.2%Trimmed
Lilly Eli & Co(LLY)0.1%Added1.3%Trimmed
Broadcom Inc(AVGO)0.1%Trimmed2.4%Trimmed
Alphabet Inc(GOOGL)0.1%Added1.1%Added
Advanced Micro Devices Inc(AMD)0.1%Added0.4%Added
Alphabet Inc(GOOG)0.1%Added3.5%Trimmed
Abbvie Inc(ABBV)under 0.1%Added0.3%Trimmed
Applied Matls Inc(AMAT)under 0.1%Trimmed0.6%Trimmed
Abbott Labs(ABT)under 0.1%Added0.1%Trimmed
Kla-tencor Corp(KLAC)under 0.1%Added3.6%Added
Mastercard Inc(MA)under 0.1%Added0.3%Trimmed
G7997r103(STX)under 0.1%Addedunder 0.1%Added
JPMorgan Chase & Co(JPM)under 0.1%Trimmed0.5%Added
Oracle Corp(ORCL)under 0.1%Added0.2%Added
Micron Technology Inc(MU)under 0.1%Trimmed0.4%Added
09290d101(BLK)0.1%Addedunder 0.1%Trimmed

and 94 smaller ones

Moved different ways in Q2 2026

Stocks one manager started or added to while the other trimmed or sold out, between the same two quarter ends. A 13F shows the quarter ends, never when in between anything was bought or sold, or why.

  • Alphabet Inc(GOOG)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Microsoft Corp(MSFT)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Amazon Com Inc(AMZN)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Visa Inc(V)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Lilly Eli & Co(LLY)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Netflix Inc(NFLX)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Unitedhealth Group Inc(UNH)Citadel Advisors LLC trimmed; AllianceBernstein LP added
  • TJX Cos Inc New(TJX)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • JPMorgan Chase & Co(JPM)Citadel Advisors LLC trimmed; AllianceBernstein LP added
  • Merck & Co Inc New(MRK)Citadel Advisors LLC trimmed; AllianceBernstein LP added
  • Mckesson Corp(MCK)Citadel Advisors LLC added; AllianceBernstein LP trimmed
  • Vertex Pharmaceuticals Inc(VRTX)Citadel Advisors LLC added; AllianceBernstein LP trimmed
Citadel Advisors LLC: the recordAllianceBernstein LP: the record

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