← Acadian Asset Management LLC, its record

Acadian Asset Management LLC and Arrowstreet Capital LP: 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

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.

Stock	Acadian Asset Management LLC	Arrowstreet Capital LP
Apple Inc(AAPL)	5.5%Added	3.8%Added
Nvidia Corp(NVDA)	4.6%Added	3.1%Added
Amazon Com Inc(AMZN)	2.4%Added	4.3%Added
Alphabet Inc(GOOGL)	2.6%Trimmed	2.4%Trimmed
Microsoft Corp(MSFT)	2.1%Trimmed	4.6%Added
Broadcom LTD(AVGO)	1.3%Added	1.4%Trimmed
Alphabet Inc(GOOG)	1.2%Trimmed	2.2%Trimmed
Asml Holding N V(ASML)	1.2%Trimmed	1.3%Trimmed
Lam Research Corp(LRCX)	1.1%Trimmed	2.4%Trimmed
Cisco Sys Inc(CSCO)	0.8%Added	1.0%Added
Fortinet Inc(FTNT)	0.8%Added	0.7%Added
Kla-tencor Corp(KLAC)	1.2%Added	0.6%Added
Suncor Energy Inc New(SU)	0.6%Trimmed	0.6%Added
TJX Cos Inc New(TJX)	0.8%Added	0.6%Added
Unitedhealth Group Inc(UNH)	0.6%Added	0.6%Trimmed
Seagate Technology Hldngs PL(STX)	0.5%Trimmed	0.9%Added
G0593m107(AZN)	0.5%Trimmed	0.4%Added
Bank of America Corporation(BAC)	0.5%Trimmed	0.4%Added
Booking Holdings Inc(BKNG)	0.6%Added	0.4%Added
Arista Networks Inc(ANET)	0.4%Trimmed	0.6%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)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
SanDisk Corp(SNDK)Acadian Asset Management LLC added; Arrowstreet Capital LP trimmed
Broadcom LTD(AVGO)Acadian Asset Management LLC added; Arrowstreet Capital LP trimmed
Palantir Technologies Inc(PLTR)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Salesforce Com Inc(CRM)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Seagate Technology Hldngs PL(STX)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Intuitive Surgical Inc(ISRG)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Suncor Energy Inc New(SU)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Taiwan Semiconductor MFG LTD(TSM)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Progressive Corp Ohio(PGR)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added
Unitedhealth Group Inc(UNH)Acadian Asset Management LLC added; Arrowstreet Capital LP trimmed
Mckesson Corp(MCK)Acadian Asset Management LLC trimmed; Arrowstreet Capital LP added

Acadian Asset Management LLC: the record Arrowstreet Capital LP: the record

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