Tough to be a billionaire Saudi prince this weekend. 

Saudi Arabia's Prince Alwaleed bin Talal, reportedly arrested Saturday as part of an anti-corruption sweep by his first cousin, Crown Prince Mohammad bin Salman, is a major shareholder in some of the most high-profile companies in the United States. 

For instance, Prince Alwaleed is Twitter Inc.'s (TWTR - Get Report) second-largest individual shareholder and also claims to be Citigroup Inc.'s (C - Get Report) largest individual shareholder. According to FactSet data, he owns 95% of Riyadh-listed Kingdom Holding Co., which invests in equities, real estate and hotels.

Twitter and Citigroup declined to comment on Talal's arrest.

Here's a look at his major holdings, both personal investments and through Kingdom Holding. 

Twitter

Prince Alwaleed held a 4.7% stake in the social media company as of Dec. 31; Kingdom holding is also an investor.

Citigroup

Prince Alwaleed first invested in Citigroup in 2008, participating in a 2008 private placement of convertible preferred Citigroup shares, which he converted into stock the following year.

Four Seasons

Since 2007, Prince Alwaleed has controlled the Four Seasons Hotels and Resorts luxury hotel chain along with Microsoft Corp. (MSFT - Get Report) co-founder Bill Gates. He and Gates both hold 47.5% stakes in the company, for which they paid a combined $3.8 billion, while founder Isadore Sharp owns the remaining 5%.

Plaza Hotel

In 1995, Prince Alwaleed first invested in New York's iconic Plaza Hotel, which he acquired for $325 million. The seller was none other than now-President Donald Trump, who paid $400 million for the hotel in 1988 but quickly became bogged down in debt. While the hotel has changed hands several times, Prince Alwaleed retains a 50% stake, and the New York Post reported in May that he's attempting to buy the hotel out from its current owners with Ashkenazy Acquisition Corp.

News Corp.

Once a 6.6% shareholder in Rupert Murdoch publishing company News Corp. (NWSA - Get Report) , Kingdom Holding netted about $190 million when it trimmed its stake in 2015. Kingdom Holding first backed the company in 1997 with a $400 million investment in return for 3% in non-voting preferred shares. After News Corp. bought out Fox Entertainment in 2005 for $6.6 billion, Kingdom Holding converted its stake to a 5.5% stake in common stock to ward off a potential hostile bid from Liberty Media Corp., now Liberty Media Formula One (FWONA - Get Report) .

Twenty-First Century Fox Inc.

News Corp. split in two in 2013, with the entertainment assets becoming Twenty-First Century Fox Inc. (FOXA) . Kingdom Holding maintained its Twenty-First Century Fox stake even after trimming the News Corp. stake.

Time Warner Inc.

Thanks to a 15% stake in a defunct company 20 years ago, Kingdom Holding is still a significant Time Warner Inc. (TWX) shareholder. Kingdom Holding paid $145 million in 1997 for a 5% stake in Netscape, an Internet company acquired in 1999 by AOL for about $10 billion. The next year, Time Warner would merge with AOL in a blockbuster $165 billion deal. (AOL is now part of Verizon Communications Inc. (VZ - Get Report) .) About a year ago, Time Warner agreed to be sold to AT&T Inc. (T - Get Report) for $108.7 billion; the deal is under antitrust review. He told CNBC last year that he thinks the deal is going to go through despite investor skepticism.

Lyft

Kingdom Holding bought a 5.3% stake in U.S. ride-sharing company Lyft in 2015 for $247.7 million, leading a $100 million Series F investment and also buying $147.7 million in preferred Lyft shares on the secondary market. Kingdom Holding owns $104.9 million, the company said in a regulatory filing, with Prince Alwaleed and unspecified other investors holding the balance.

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