L3VLUP
ProSign in
← Citadel Advisors LLC, its record

Citadel Advisors LLC and Marshall Wace LLP: where the books meet

At Q2 2026, at least 7.2% of the two 13F books was the same, across 95 stocks both listed, against 16% 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%16%Q4 2015: 16%, 163 in bothQ1 2016: 12%, 127 in both16Q2 2016: 14%, 136 in bothQ3 2016: 13%, 129 in bothQ4 2016: 13%, 124 in bothQ1 2017: 13%, 110 in both17Q2 2017: 11%, 105 in bothQ3 2017: 12%, 115 in bothQ4 2017: 12%, 121 in bothQ1 2018: 9.5%, 112 in both18Q2 2018: 9.6%, 125 in bothQ3 2018: 8.9%, 106 in bothQ4 2018: 7.1%, 81 in bothQ1 2019: 7.9%, 100 in both19Q2 2019: 9.0%, 100 in bothQ3 2019: 7.8%, 97 in bothQ4 2019: 8.1%, 107 in bothQ1 2020: 7.8%, 119 in both20Q2 2020: 7.0%, 99 in bothQ3 2020: 5.1%, 88 in bothQ4 2020: 4.8%, 83 in bothQ1 2021: 4.8%, 77 in both21Q2 2021: 3.5%, 58 in bothQ3 2021: 3.0%, 52 in bothQ4 2021: 4.3%, 70 in bothQ1 2022: 3.3%, 64 in both22Q2 2022: 3.5%, 64 in bothQ3 2022: 4.2%, 71 in bothQ4 2022: 4.4%, 72 in bothQ1 2023: 4.5%, 67 in both23Q2 2023: 5.2%, 88 in bothQ3 2023: 5.4%, 82 in bothQ4 2023: 5.6%, 78 in bothQ1 2024: 5.9%, 83 in both24Q2 2024: 6.7%, 99 in bothQ3 2024: 4.8%, 84 in bothQ4 2024: 5.0%, 91 in bothQ1 2025: 4.8%, 87 in both25Q2 2025: 5.2%, 84 in bothQ3 2025: 5.2%, 85 in bothQ4 2025: 7.4%, 101 in bothQ1 2026: 7.2%, 97 in both26Q2 2026: 7.2%, 95 in both
  • Q4 2015: 16%, 163 in both
  • Q1 2016: 12%, 127 in both
  • Q2 2016: 14%, 136 in both
  • Q3 2016: 13%, 129 in both
  • Q4 2016: 13%, 124 in both
  • Q1 2017: 13%, 110 in both
  • Q2 2017: 11%, 105 in both
  • Q3 2017: 12%, 115 in both
  • Q4 2017: 12%, 121 in both
  • Q1 2018: 9.5%, 112 in both
  • Q2 2018: 9.6%, 125 in both
  • Q3 2018: 8.9%, 106 in both
  • Q4 2018: 7.1%, 81 in both
  • Q1 2019: 7.9%, 100 in both
  • Q2 2019: 9.0%, 100 in both
  • Q3 2019: 7.8%, 97 in both
  • Q4 2019: 8.1%, 107 in both
  • Q1 2020: 7.8%, 119 in both
  • Q2 2020: 7.0%, 99 in both
  • Q3 2020: 5.1%, 88 in both
  • Q4 2020: 4.8%, 83 in both
  • Q1 2021: 4.8%, 77 in both
  • Q2 2021: 3.5%, 58 in both
  • Q3 2021: 3.0%, 52 in both
  • Q4 2021: 4.3%, 70 in both
  • Q1 2022: 3.3%, 64 in both
  • Q2 2022: 3.5%, 64 in both
  • Q3 2022: 4.2%, 71 in both
  • Q4 2022: 4.4%, 72 in both
  • Q1 2023: 4.5%, 67 in both
  • Q2 2023: 5.2%, 88 in both
  • Q3 2023: 5.4%, 82 in both
  • Q4 2023: 5.6%, 78 in both
  • Q1 2024: 5.9%, 83 in both
  • Q2 2024: 6.7%, 99 in both
  • Q3 2024: 4.8%, 84 in both
  • Q4 2024: 5.0%, 91 in both
  • Q1 2025: 4.8%, 87 in both
  • Q2 2025: 5.2%, 84 in both
  • Q3 2025: 5.2%, 85 in both
  • Q4 2025: 7.4%, 101 in both
  • Q1 2026: 7.2%, 97 in both
  • Q2 2026: 7.2%, 95 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 LLCMarshall Wace LLP
iShares Trust(IVV)1.5%Added24%Added
Amazon Com Inc(AMZN)0.3%Added1.8%Added
Nvidia Corp(NVDA)0.3%Trimmed1.4%Trimmed
Apple Inc(AAPL)0.2%Added2.1%Added
Microsoft Corp(MSFT)0.2%Added1.0%Trimmed
Lilly Eli & Co(LLY)0.1%Added0.3%Trimmed
Broadcom Inc(AVGO)0.1%Trimmed0.4%Trimmed
934423104(WBD)0.1%Added0.1%Added
Alphabet Inc(GOOGL)0.1%Added0.6%Trimmed
Advanced Micro Devices Inc(AMD)0.1%Added1.8%Added
Alphabet Inc(GOOG)0.1%Added0.2%Trimmed
Blackrock Inc(BLK)0.1%Addedunder 0.1%New
Abbvie Inc(ABBV)under 0.1%Added0.6%Added
Applied Matls Inc(AMAT)under 0.1%Trimmed0.3%Trimmed
Abbott Labs(ABT)under 0.1%Added0.4%Added
JPMorgan Chase & Co(JPM)under 0.1%Trimmed0.5%Added
Oracle Corp(ORCL)under 0.1%Added0.1%Added
Micron Technology Inc(MU)under 0.1%Trimmed1.2%Added
G7997r103(STX)under 0.1%Addedunder 0.1%Added
O Reilly Automotive Inc New(ORLY)under 0.1%Addedunder 0.1%Added

and 75 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.

  • Micron Technology Inc(MU)Citadel Advisors LLC trimmed; Marshall Wace LLP added
  • Microsoft Corp(MSFT)Citadel Advisors LLC added; Marshall Wace LLP trimmed
  • Lilly Eli & Co(LLY)Citadel Advisors LLC added; Marshall Wace LLP trimmed
  • Costco WHSL Corp New(COST)Citadel Advisors LLC trimmed; Marshall Wace LLP added
  • Alphabet Inc(GOOGL)Citadel Advisors LLC added; Marshall Wace LLP trimmed
  • Tesla MTRS Inc(TSLA)Citadel Advisors LLC trimmed; Marshall Wace LLP added
  • Alphabet Inc(GOOG)Citadel Advisors LLC added; Marshall Wace LLP trimmed
  • Unitedhealth Group Inc(UNH)Citadel Advisors LLC trimmed; Marshall Wace LLP added
  • Johnson & Johnson(JNJ)Citadel Advisors LLC trimmed; Marshall Wace LLP added
  • Howmet Aerospace(HWM)Citadel Advisors LLC added; Marshall Wace LLP trimmed
  • JPMorgan Chase & Co(JPM)Citadel Advisors LLC trimmed; Marshall Wace LLP added
  • United Continent(UAL)Citadel Advisors LLC added; Marshall Wace LLP trimmed
Citadel Advisors LLC: the recordMarshall Wace LLP: the record

Company names, tickers and logos are the trademarks of their respective owners and appear here to identify the company whose public figures are being used. L3VLUP is not affiliated with, sponsored by or endorsed by any company shown, and nothing here is a statement by or about that company. More