MASSACHUSETTS FINANCIAL SERVICES CO MA
Q4 2023 Form 13-F

BOSTON, MASSACHUSETTS
CIK 0000912938 · CRD 110045 · SEC-registered investment adviser
Holdings reported by American Beacon Advisors Inc since Q2 2026
Consolidated report · includes 9 managers since Q2 2013
$309.6B Reported Value Total

MFS INVESTMENT MANAGEMENT reports 344 total accounts under management (AUM). There are 316 discretionary accounts valued at $432,205,800,996, and 28 non-discretionary accounts valued at $22,119,513,668.

Source: Form ADV filed * Note that certain holdings are exempt from Form 13-F reporting, so the AUM totals may be greater than the Form 13-F total.
SEC Registered Discretionary & Non-Discretionary
Private funds (Form ADV)
18 funds · $3.8B gross asset value
Securitized Asset Fund: $2.4B · Other: $926.3M · Hedge Fund: $398.5M
Source: Form ADV filed 2026-03-31
Reported value
$309.6B
Quarter over quarter
+11.3%
Holdings
831
Top-10 concentration
19.3%

Reports holdings for

Holdings reported by

Key People

Form ADV owners & control persons
John Malcolm Corcoran
CHIEF FINANCIAL OFFICER
Heidi Walter Hardin
DIRECTOR, EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL, AND SECRETARY
Melissa Jane Kennedy
DIRECTOR
Q3 2023
Q1 2024
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Q4 2023 13F filing summary

Period of report December 31, 2023
Filed February 08, 2024
Form 13F-HR
Reported value $309.6B
Positions 831
Change in reported value +8.4%
New positions 50
Exited positions 52
Position turnover 11.6%
Top-10 concentration 19.3%

13F filings by quarter

Quarter Positions Value
Q2 2026 13F
Filed Aug 3, 2026
 997 $315.2B
Q1 2026 13F
Filed May 14, 2026
 940 $297.5B
Q4 2025 13F
Filed Jan 22, 2026
 913 $310.1B
Q3 2025 13F
Filed Oct 29, 2025
 854 $322.8B
Q2 2025 13F
Filed Aug 8, 2025
 883 $315.1B
Q1 2025 13F
Filed May 2, 2025
 879 $300.8B
Q4 2024 13F
Filed Feb 12, 2025
 872 $316.9B
Q3 2024 13F
Filed Nov 12, 2024
 844 $334.8B
Q2 2024 13F
Filed Aug 9, 2024
 859 $325.3B
Q1 2024 13F
Filed May 14, 2024
 837 $334.7B
Q4 2023 13F
Filed Feb 8, 2024
 831 $309.6B
Q3 2023 13F
Filed Nov 8, 2023
 833 $285.6B
Q2 2023 13F
Filed Aug 9, 2023
 819 $304.6B
Q1 2023 13F
Filed May 10, 2023
 836 $292.2B
Q4 2022 13F
Filed Feb 13, 2023
 844 $286.5B
Q3 2022 13F
Filed Nov 9, 2022
 847 $267.5B
Q2 2022 13F
Filed Aug 9, 2022
 846 $290.1B
Q1 2022 13F
Filed May 11, 2022
 857 $337.4B
Q4 2021 13F
Filed Feb 10, 2022
 884 $365.3B
Q3 2021 13F
Filed Nov 10, 2021
 903 $341.8B

33 earlier quarters on file — choose one from the quarter menu above.

Top 20 holdings · Q4 2023

# Holding Reported value % of portfolio
1 MSFT MICROSOFT CORP $14.1B 4.54%
2 GOOGL ALPHABET INC $7.1B 2.31%
3 AAPL APPLE INC $5.6B 1.82%
4 V VISA INC $5.4B 1.73%
5 JPM JPMORGAN CHASE & CO $5.0B 1.62%
6 AMZN AMAZON COM INC $4.8B 1.55%
7 LIN LINDE PLC $4.7B 1.53%
8 NVDA NVIDIA CORPORATION $4.6B 1.48%
9 ACN ACCENTURE PLC IRELAND $4.5B 1.46%
10 CMCSA COMCAST CORP NEW $4.0B 1.3%
11 AON AON PLC $3.6B 1.17%
12 CI THE CIGNA GROUP $3.4B 1.1%
13 BSX BOSTON SCIENTIFIC CORP $3.3B 1.07%
14 META META PLATFORMS INC $3.3B 1.05%
15 ETN EATON CORP PLC $3.3B 1.05%
16 COP CONOCOPHILLIPS $3.2B 1.04%
17 HON HONEYWELL INTL INC $3.2B 1.02%
18 UBS UBS GROUP AG $3.1B 1.01%
19 ADI ANALOG DEVICES INC $3.0B 0.97%
20 TSM TAIWAN SEMICONDUCTOR MFG LTD $3.0B 0.96%

Values as reported on the Q4 2023 Form 13F. Every position is in the holdings table below.

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