Arrowstreet Capital LP and MFS Investment Management: where the books meet

At Q2 2026, at least 38% of the two 13F books was the same, across 208 stocks both listed, against 0.0% 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	Arrowstreet Capital LP	MFS Investment Management
Nvidia Corp(NVDA)	3.1%Added	4.3%Trimmed
Apple Inc(AAPL)	3.8%Added	2.8%Added
Amazon Com Inc(AMZN)	4.3%Added	2.8%Added
Microsoft Corp(MSFT)	4.6%Added	2.8%Trimmed
Alphabet Inc(GOOGL)	2.4%Trimmed	3.3%Added
Broadcom Inc(AVGO)	1.4%Trimmed	1.7%Added
Mastercard Incorporated(MA)	1.0%Added	0.9%Trimmed
Seagate Technology Hldngs PL(STX)	0.9%Added	0.8%Added
Kla-tencor Corp(KLAC)	0.6%Added	1.4%Added
Amphenol Corp New(APH)	0.9%Added	0.6%Trimmed
Taiwan Semiconductor MFG LTD(TSM)	0.6%Added	1.5%Trimmed
Arista Networks Inc(ANET)	0.6%Trimmed	0.5%Added
Progressive Corp Ohio(PGR)	0.6%Added	0.5%Trimmed
Mckesson Corp(MCK)	0.5%Added	0.6%Trimmed
Medtronic PLC(MDT)	0.4%Added	0.8%Trimmed
Boston Scientific Corp(BSX)	0.4%Added	0.5%Added
Linde PLC(LIN)	0.4%Added	1.0%Added
Abbott Labs(ABT)	0.4%Added	0.4%Trimmed
Aon PLC(AON)	0.4%Added	0.8%Trimmed
UBS Group AG(UBS)	0.4%Trimmed	1.0%Trimmed

and 188 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.

Nvidia Corp(NVDA)Arrowstreet Capital LP added; MFS Investment Management trimmed
Alphabet Inc(GOOGL)Arrowstreet Capital LP trimmed; MFS Investment Management added
Microsoft Corp(MSFT)Arrowstreet Capital LP added; MFS Investment Management trimmed
Broadcom Inc(AVGO)Arrowstreet Capital LP trimmed; MFS Investment Management added
Alphabet Inc(GOOG)Arrowstreet Capital LP trimmed; MFS Investment Management added
SanDisk Corp(SNDK)Arrowstreet Capital LP trimmed; MFS Investment Management added
Taiwan Semiconductor MFG LTD(TSM)Arrowstreet Capital LP added; MFS Investment Management trimmed
JPMorgan Chase & Co(JPM)Arrowstreet Capital LP added; MFS Investment Management trimmed
Mastercard Incorporated(MA)Arrowstreet Capital LP added; MFS Investment Management trimmed
Johnson & Johnson(JNJ)Arrowstreet Capital LP added; MFS Investment Management trimmed
Medtronic PLC(MDT)Arrowstreet Capital LP added; MFS Investment Management trimmed
Aon PLC(AON)Arrowstreet Capital LP added; MFS Investment Management trimmed

Arrowstreet Capital LP: the record MFS Investment Management: the record

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