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← Arrowstreet Capital LP, its record

Arrowstreet Capital LP and Acadian Asset Management LLC: where the books meet

At Q2 2026, at least 40% of the two 13F books was the same, across 214 stocks both listed, against 20% at Q2 2013. 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%22%45%Q2 2013: 20%, 140 in bothQ3 2013: 0.0%, 0 in bothQ4 2013: 0.0%, 0 in bothQ1 2014: 0.0%, 0 in both14Q2 2014: 0.0%, 0 in bothQ3 2014: 0.0%, 0 in bothQ4 2014: 0.0%, 0 in bothQ1 2015: 0.0%, 0 in both15Q2 2015: 0.0%, 0 in bothQ3 2015: 0.0%, 0 in bothQ4 2015: 0.0%, 0 in bothQ1 2016: 0.0%, 0 in both16Q2 2016: 0.0%, 0 in bothQ3 2016: 0.0%, 0 in bothQ4 2016: 0.0%, 0 in bothQ1 2017: 26%, 159 in both17Q2 2017: 30%, 176 in bothQ3 2017: 25%, 178 in bothQ4 2017: 20%, 163 in bothQ1 2018: 24%, 184 in both18Q2 2018: 21%, 171 in bothQ3 2018: 25%, 166 in bothQ4 2018: 24%, 164 in bothQ1 2019: 18%, 162 in both19Q2 2019: 18%, 157 in bothQ3 2019: 22%, 153 in bothQ4 2019: 18%, 140 in bothQ1 2020: 26%, 140 in both20Q2 2020: 29%, 162 in bothQ3 2020: 25%, 154 in bothQ4 2020: 24%, 172 in bothQ1 2021: 27%, 165 in both21Q2 2021: 28%, 164 in bothQ3 2021: 29%, 182 in bothQ4 2021: 33%, 175 in bothQ1 2022: 32%, 182 in both22Q2 2022: 27%, 175 in bothQ3 2022: 26%, 173 in bothQ4 2022: 28%, 173 in bothQ1 2023: 30%, 196 in both23Q2 2023: 33%, 201 in bothQ3 2023: 33%, 192 in bothQ4 2023: 33%, 187 in bothQ1 2024: 32%, 180 in both24Q2 2024: 36%, 223 in bothQ3 2024: 31%, 196 in bothQ4 2024: 34%, 201 in bothQ1 2025: 39%, 203 in both25Q2 2025: 45%, 224 in bothQ3 2025: 45%, 224 in bothQ4 2025: 40%, 210 in bothQ1 2026: 41%, 223 in both26Q2 2026: 40%, 214 in both
  • Q2 2013: 20%, 140 in both
  • Q3 2013: 0.0%, 0 in both
  • Q4 2013: 0.0%, 0 in both
  • Q1 2014: 0.0%, 0 in both
  • Q2 2014: 0.0%, 0 in both
  • Q3 2014: 0.0%, 0 in both
  • Q4 2014: 0.0%, 0 in both
  • Q1 2015: 0.0%, 0 in both
  • Q2 2015: 0.0%, 0 in both
  • Q3 2015: 0.0%, 0 in both
  • Q4 2015: 0.0%, 0 in both
  • Q1 2016: 0.0%, 0 in both
  • Q2 2016: 0.0%, 0 in both
  • Q3 2016: 0.0%, 0 in both
  • Q4 2016: 0.0%, 0 in both
  • Q1 2017: 26%, 159 in both
  • Q2 2017: 30%, 176 in both
  • Q3 2017: 25%, 178 in both
  • Q4 2017: 20%, 163 in both
  • Q1 2018: 24%, 184 in both
  • Q2 2018: 21%, 171 in both
  • Q3 2018: 25%, 166 in both
  • Q4 2018: 24%, 164 in both
  • Q1 2019: 18%, 162 in both
  • Q2 2019: 18%, 157 in both
  • Q3 2019: 22%, 153 in both
  • Q4 2019: 18%, 140 in both
  • Q1 2020: 26%, 140 in both
  • Q2 2020: 29%, 162 in both
  • Q3 2020: 25%, 154 in both
  • Q4 2020: 24%, 172 in both
  • Q1 2021: 27%, 165 in both
  • Q2 2021: 28%, 164 in both
  • Q3 2021: 29%, 182 in both
  • Q4 2021: 33%, 175 in both
  • Q1 2022: 32%, 182 in both
  • Q2 2022: 27%, 175 in both
  • Q3 2022: 26%, 173 in both
  • Q4 2022: 28%, 173 in both
  • Q1 2023: 30%, 196 in both
  • Q2 2023: 33%, 201 in both
  • Q3 2023: 33%, 192 in both
  • Q4 2023: 33%, 187 in both
  • Q1 2024: 32%, 180 in both
  • Q2 2024: 36%, 223 in both
  • Q3 2024: 31%, 196 in both
  • Q4 2024: 34%, 201 in both
  • Q1 2025: 39%, 203 in both
  • Q2 2025: 45%, 224 in both
  • Q3 2025: 45%, 224 in both
  • Q4 2025: 40%, 210 in both
  • Q1 2026: 41%, 223 in both
  • Q2 2026: 40%, 214 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.

StockArrowstreet Capital LPAcadian Asset Management LLC
Apple Inc(AAPL)3.8%Added5.5%Added
Nvidia Corp(NVDA)3.1%Added4.6%Added
Amazon Com Inc(AMZN)4.3%Added2.4%Added
Alphabet Inc(GOOGL)2.4%Trimmed2.6%Trimmed
Microsoft Corp(MSFT)4.6%Added2.1%Trimmed
Broadcom Inc(AVGO)1.4%Trimmed1.3%Added
Alphabet Inc(GOOG)2.2%Trimmed1.2%Trimmed
Asml Holding N V(ASML)1.3%Trimmed1.2%Trimmed
Lam Research Corp(LRCX)2.4%Trimmed1.1%Trimmed
Cisco Sys Inc(CSCO)1.0%Added0.8%Added
Fortinet Inc(FTNT)0.7%Added0.8%Added
Kla-tencor Corp(KLAC)0.6%Added1.2%Added
Suncor Energy Inc New(SU)0.6%Added0.6%Trimmed
TJX Cos Inc New(TJX)0.6%Added0.8%Added
Unitedhealth Group Inc(UNH)0.6%Trimmed0.6%Added
Seagate Technology Hldngs PL(STX)0.9%Added0.5%Trimmed
G0593m107(AZN)0.4%Added0.5%Trimmed
Bank Amer Corp(BAC)0.4%Added0.5%Trimmed
Booking HLDGS Inc(BKNG)0.4%Added0.6%Added
Arista Networks Inc(ANET)0.6%Trimmed0.4%Trimmed

and 194 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.

  • Microsoft Corp(MSFT)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • SanDisk Corp(SNDK)Arrowstreet Capital LP trimmed; Acadian Asset Management LLC added
  • Broadcom Inc(AVGO)Arrowstreet Capital LP trimmed; Acadian Asset Management LLC added
  • Palantir Technologies Inc(PLTR)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Salesforce Com Inc(CRM)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Seagate Technology Hldngs PL(STX)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Intuitive Surgical Inc(ISRG)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Suncor Energy Inc New(SU)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Taiwan Semiconductor MFG LTD(TSM)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Progressive Corp Ohio(PGR)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
  • Unitedhealth Group Inc(UNH)Arrowstreet Capital LP trimmed; Acadian Asset Management LLC added
  • Mckesson Corp(MCK)Arrowstreet Capital LP added; Acadian Asset Management LLC trimmed
Arrowstreet Capital LP: the recordAcadian Asset Management LLC: the record

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