Warren Buffett adds another ‘mystery stock’ to Berkshire's portfolio

He may be retiring in December, but the ‘Sage of Omaha’ still has one or two more tricks up his sleeve and investors are still curious to know which shares Berkshire Hathaway (BRK.B:NYSE) has been buying and selling this year.

In the group’s latest SEC filing, Berkshire was a net seller of US stocks to the tune of $1.5 billion in the first quarter, unloading $4.7 billion-worth of shares in three financial stocks, Bank of America (BAC:NYSE), Capital One (COF:NYSE) and Citigroup (C:NYSE), where it now no longer has a position.

Berkshire also reduced its holdings in dialysis firm DaVita (DVA:NYSE) and media business Formula One Group (FWONK:NASDAQ) and sold out of Brazilian digital banking services provider Nu Holdings (NU:NYSE).

On the other side of the ledger, the group bought $3.2 billion-worth of shares, more than doubling its stakes in alcoholic beverages firm Constellation Brands (STZ:NYSE) and leisure products firm Pool Corp (POOL:NASDAQ) and adding $2 billion of shares in ‘one or more holding(s) for which it is requesting confidential treatment’.

The new holding is listed as ‘commercial, industrial and other’, triggering a great deal of speculation as to its identity.

Another legendary investor whose every move is watched, Howard Marks, founder and co-chair of Oaktree Capital Management, made several changes to his portfolios in the first quarter.

Marks increased his bet on precious metals, raising his holdings in Barrick Gold (GOLD:NYSE) and Freeport-McMoRan (FCX:NYSE), and cut his China exposure including NetEase (9999:HKG) and Yum China Holdings (YUMC:NYSE).

Bill Ackman, founder and manager of hedge fund Pershing Square Holdings (PSH), made waves in the first quarter by selling his entire stake in footwear and athleisure brand Nike (NKE:NYSE) and opening a major position in mobility services group Uber Technologies (UBER:NYSE) instead.

Ackman also raised his holding in Hertz Global (HTZ:NASDAQ) while reducing his direct-to-consumer exposure by selling down shares in Chipotle Mexican Grill (CMG:NYSE) and Hilton Hotels (HLT:NYSE).

Seth Klarman, billionaire chief executive of Baupost Group and a true exponent of value investing, added to his holdings in Alphabet (GOOG:NASDAQ), Eagle Materials (EXP:NYSE) and Wesco (WCC:NYSE), and opened new positions in Elevance Health (ELV:NYSE) and Fidelity National Information Services (FIS:NYSE).

At the same time, Klarman reduced his holdings in telecoms firm Liberty Global (LBTYA:NASDAQ), satellite communications company Viasat (VSAT:NASDAQ) and insurance broker and asset manager Willis Towers Watson (WTW:NASDAQ)

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