This page tracks Thornburg Investment Management Inc’s institutional portfolio moves as disclosed in its quarterly SEC Form 13F filings. Each quarter we log the fund’s new positions, exits, and changes in size across its holdings, giving readers a running record of how this large asset manager has been repositioning over time. Because 13F filings report a snapshot of holdings rather than exact trade dates, all moves below are described as occurring during the quarter ending 2026-03-31, not on a specific day.
Readers researching what stocks a major fund has recently added or trimmed can use this profile the way many track well-known portfolios like Berkshire Hathaway’s total holdings worth and buy-sell activity, though the details here are specific to Thornburg’s own filings.
New Positions and Exits, Quarter Ending 2026-03-31
During the quarter ending 2026-03-31, Thornburg Investment Management Inc opened a new position in TotalEnergies SE (TTE) worth $1,089,907,268, one of the largest new stakes of the period. The fund also opened a new position in AstraZeneca PLC (AZN) worth $555,666,808, while separately exiting a different AstraZeneca PLC (AZN) position that had been worth $46,515,201, reflecting a notable shift in how the fund holds that name.
Position Increases and Reductions, Quarter Ending 2026-03-31
Several existing positions grew during the quarter. Merck & Co Inc (MRK) increased 14% to $448,522,075, AT&T Inc (T) increased 25% to $900,001,624, and TC Energy Corp (TRP) increased 33% to $295,036,643. South Bow Corp (SOBO) rose 55% to $120,678,081, LyondellBasell Industries NV climbed 86% to $78,713,645, and Booking Holdings Inc (BKNG) more than doubled, up 111% to $47,201,898. Other increases included Taiwan Semiconductor Mfg Ltd (up 21% to $237,021,908), CME Group Inc (up 8% to $338,306,295), Enbridge Inc (up 14% to $197,176,881), Freeport-McMoRan Inc (up 17% to $166,713,835), and Linde PLC (up 17% to $135,407,393).
On the other side, several positions were trimmed. Broadcom Inc (AVGO) was reduced 9% to $644,909,273, Equitable Hldgs Inc (EQH) fell 20% to $185,334,948, and Kanzhun Limited dropped 33% to $83,457,808. Capital One Finl Corp was cut 42% to $25,479,998, TransDigm Group Inc (TDG) fell 46% to $34,377,072, and Marex Group PLC (MRX) was reduced 57% to $18,227,737.
This profile will be updated each quarter as new Form 13F filings become available, adding fresh position changes beneath this foundation so readers can follow Thornburg Investment Management Inc’s portfolio activity over time. Nothing on this page is investment advice or a recommendation to buy or sell any security.
Related ticker coverage
- TTE — all coverage →
- AZN — all coverage →
- MRK — all coverage →
- SOBO — all coverage →
- TRP — all coverage →
- T — all coverage →
- CME — all coverage →
- ENB — all coverage →
- FCX — all coverage →
- BKNG — all coverage →
- EQH — all coverage →
- TDG — all coverage →
- MRX — all coverage →
- AVGO — all coverage →
- LIN — all coverage →
Source: SEC Form 13F filings. This page updates every quarter.