For a guy who spends so much time touting his business prowess, Donald Trump isn't exactly corporate America's best friend.

The presumptive Republican presidential nominee has made his fair share of enemies on the campaign trail, ranging from entire demographic groups and major media outlets to former allies and members of his own party. He has accumulated plenty of foes in the business world, too.

The real estate magnate has a "frenemy" in Mark Cuban. The Dallas Mavericks owner and "Shark Tank" star has said in the past he "like[s] the guy" and commended his direct, simply style, but also bashed his business skills, chided his lack of depth on the issues and called into question Trump's self-proclaimed $10 billion net worth.

This week, he told CNN he believes Trump would be a "puppet president" and took to Twitter to roast Trump over his impending fundraising efforts, writing he will have to "grovel" for cash from donors even though the real estate magnate insists he doesn't need money.

Hours later, Cuban retweeted a chart celebrating Trump's record GOP primary votes.

Trump has friendlier friendships with other business bigwigs. Billionaire activist investor Carl Icahn

has voiced his support

for the GOP candidate.

Trian Fund Management

's Nelson Peltz said recently that

he plans to meet with Trump

soon to discuss his positions and suss out "what is reality and what is talk show stuff."

Still, Trump's list of business adversaries is long and growing. Here are 12 big names in corporate America and investing who have not minced their words when it comes to Trump.

Image placeholder title

1. Jeff Bezos

There is no love lost between Trump and Amazon (AMZN) - Get Report founder Jeff Bezos. The pair have traded barbs on numerous occasions in recent months, ranging from antitrust allegations to suggested trips to space.

Trump has accused Bezos of utilizing The Washington Post, which he bought in 2013, to influence policy to Amazon's convenience and has consistently hit the publication for treating him what he feels is unfairly.

"He's using The Washington Post, which is peanuts, he's using that for political purposes to save Amazon in terms of taxes and in terms of antitrust," Trump said in an interview with Fox News' Sean Hannity in May. He has made similar accusations via Twitter before.

Bezos has hit back at Trump, at a recent Post-sponsored technology conference saying the candidate's attacks are "not an appropriate way for a presidential candidate to behave" and emphasizing that he is "very, very comfortable with all of Amazon's approaches and behaviors."

Image placeholder title

2. Meg Whitman

Hewlett Packard Enterprise (HPE) - Get Report chief executive is no fan of Trump.

Whitman, who backed Chris Christie's failed presidential bid, slammed the New Jersey governor in February after he endorsed the real estate magnate, calling it "an astonishing display of political opportunism" and calling Trump a "dishonest demagogue who plays to our worst fears" and would "take America on a dangerous journey."

She has publicly assured she won't be voting for Trump, tellingCNBC in March, "Look at the comments he's made about women, about Muslims, about reporters, it's just repugnant." And she has put her money where her mouth is, according to campaign finance tracker OpenSecrets, giving $100,000 to Our Principles PAC, a super PAC created in protest of Trump.

Whitman isn't convinced on Trump's business record, either. She toldTheStreet's Jim Cramer recently the "jury's still out" on whether he's a good businessman.

Image placeholder title

3. Terry Lundgren

Trump's disparaging remarks calling Mexicans "rapists" and "killers" promptedMacy's (M) - Get Report to drop his menswear collection, which it had carried for 11 years. The move put the retail giant and CEO Terry Lundgren in the candidate's war path.

Trump has on numerous occasions attacked Macy's since, calling it a "very disloyal company" that is "weak on border security and stopping illegal immigration" and citing Lundgren as an example of an overpaid CEO. Macy's is also one of many companies he has called on supporters to boycott.

Lundgren hasn't taken Trump's attacks lying down, though he has been more measured in his response than the bombastic candidate.

He said the situation was "unfortunate" in an interview with Bloomberg and attempted to characterize the decision to drop Trump as strictly business. "We're not going to support any presidential candidate, because you can't possibly win as a retailer trying to sell to everybody," he said. "We're not a political company, this is the last thing that we want to be involved with."

Image placeholder title

4. John Legere

T-Mobile (TMUS) - Get Report CEO John Legere, like Trump, has quite an affinity for Twitter, so it is only fitting the pair's tussles have taken place there.

Before Trump began his presidential bid, he went after Legere on Twitter, slamming T-Mobile's service as "terrible." The executive responded that he would be checking out of Trump's hotel immediately.

The two had another showdown in November when Trump took a swipe at UFC fighter Ronda Rousey after she lost a fight. "Donald I dare you to get in the ring with her and say that," Legere tweeted in reply to Trump. The Twitter tussle continued from there.

Image placeholder title

5. Mark Zuckerberg

Mark Zuckerberg has not called out Trump directly, but he hasn't exactly hidden his distaste for him, either. At Facebook's (FB) - Get Report F8 developer conference in April, Zuckerberg took some thinly-veiled swipes at the presumptive GOP nominee. "I hear fearful voices talking about building walls," he said. "If the world starts to turn inwards, then our community will just have to work harder to bring people together."

Not that Trump is an enormous fan of Zuckerberg, anyway. On his campaign website he calls dropout Republican contender Marco Rubio the Facebook exec's "personal senator."

But dislike one another all they may, Trump's candidacy is largely good for Facebook, driving up engagement and ad dollars. A President Trump, however, would be another story.

Facebook is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. See how Cramer rates the stock here. Want to be alerted before Cramer buys or sells FB? Learn more now.

Image placeholder title

6. Mark Fields

Ford(F) - Get Report is one of the examples Trump often invokes on the campaign trail as a U.S. company shipping jobs and operations to Mexico. But CEO Mark Fields isn't having it.

When Trump mistakenly took credit for some of the company's decisions, Fields clarified his firm had not talked to Trump or made any changes to its manufacturing plans related to Mexico. He has said he has reached out to Trump directly to point out Ford's support of economic development and job creation in the U.S. and around the world.

"The last I looked, Ford Motor Company is here to stay in the United States," he said in a March interview with CNBC. "It's presidential politics. We're just going to stay focused on the facts. We are very proud as a company of what we do in terms of contributing to economic development here in the U.S."

Image placeholder title

7. Tim Cook

Apple (AAPL) - Get Report CEO Tim Cook has made a point of being part of the political conversation, weighing in on legislation, meeting with elected officials and upping his company's political activities. He has largely stayed out of presidential politics, but Trump dragged him in when he called for an Apple boycott in response to the tech giant's refusal to unlock an alleged terrorist's iPhone.

Cook discussed Trump's boycott call in an interview with Time and was careful in his remarks.

"I haven't talked to him so I don't know what he thinks," he said. "The way I look at it is, Apple is this great American company that could have only happened here. And we see it as our responsibility to stand up on something like this and speak up for all these people that are thinking what we're thinking but don't have the voice."

Cook hasn't had much more to say publicly about Trump, but there are indicators he may be speaking about him privately. He, along with other tech and government leaders, reportedly attended a meeting at the American Enterprise Institute's annual world forum in March to discuss how to halt Trump's candidacy.

Apple is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. See how Cramer rates the stock here. Want to be alerted before Cramer buys or sells AAPL? Learn more now.

Image placeholder title

8. Sundar Pichai

When Trump called for a ban on Muslims entering the United States, Sundar Pichai, chief executive officer of Alphabet's (GOOGL) - Get Report Google, took issue. The Indian-American business executive penned a statement on Medium responding to the billionaire's rhetoric, though he never called him out by name.

"The open-mindedness, tolerance, and acceptance of New Americans is one of the country's greatest strengths and most defining characteristics. And that is no coincidence -- America, after all, was and is a country of immigrants," wrote Pichai, who came to the U.S. over 20 years ago. "That is why it's so disheartening to see the intolerant discourse playing out in the news these days  --  statements that our country would be a better place without the voices, ideas and the contributions of certain groups of people, based solely on where they come from, or their religion."

He closed the piece: "Let's not let fear defeat our values. We must support Muslim and other minority communities in the U.S. and around the world."

Alphabet is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. See how Cramer rates the stock here. Want to be alerted before Cramer buys or sells GOOGL? Learn more now.

Image placeholder title

9. Barry Diller

Barry Diller's take on Trump makes Hillary Clinton's attacks look pretty mild. The chairman and senior executive of IAC/InterActiveCorp (IAC) - Get Report and Expedia (EXPE) - Get Report has called the candidate "evil."

"There's nobody I've ever known in politics that has been -- that has risen to national -- I mean, to the presidency, that was of evil character," he toldCNBC in May. He added, "Anybody who attacks people in the manner he attacks people -- anybody who would do that, anybody who -- if I have a disagreement with you or I think that you don't like me, I don't have the right to find out the vulnerability that I think could make you miserable and that is just completely unfair. I don't have that right. He has that as a natural state. I call that evil. That is evil."

Last year, he said if Trump didn't fall he would leave the country or "join the resistance," to which the real estate magnate responded on Twitter.

Image placeholder title

10. Michael Bloomberg

After considering making his own run for the White House, billionaire businessman Michael Bloomberg in March announced he would not make a third-party presidential bid in 2016. His reasoning, in part: the chance that his candidacy could lead to the election of Trump or Texas Senator Ted Cruz was "not a risk I can take in good conscience."

While Trump and Bloomberg have known one another for years and have always been on friendly terms, with the former New York mayor appearing twice on 'The Apprentice,' the real estate magnate's divisive rhetoric was too much for Bloomberg to take.

"... [H]e has run the most divisive and demagogic presidential campaign I can remember, preying on people's prejudices and fears. Abraham Lincoln, the father of the Republican Party, appealed to our 'better angels.' Trump appeals to our worst impulses," he wrote.

Bloomberg again commented on Trump in May, acknowledging in an interview with CNBC that the drummer Trump marches to "has been playing the right tune to get him this far." But he also emphasized that it's important to focus not only on what candidates say they will do but also how. "It's nice to say we're going to create jobs; OK, how are you going to create jobs?" he said. "It's nice to say we're going to make the world safer. OK, what are you going to do?"

Image placeholder title

11. Stanley Druckenmiller

Duquense Capital Management's Stanley Druckenmiller has poured thousands of dollars into campaign coffers this election cycle, much of which has gone to Trump's opponents.

According to OpenSecrets data, Druckenmiller has given hundreds of thousands of dollars to super PACs backing Jeb Bush, Chris Christie and John Kasich. In March, he publicly endorsed the Ohio governor, calling him a "no-brainer" choice.

The billionaire investor has made no secret of his distaste for Trump, either. He has slammed Trump as having a "kindergartner" view of economics and China and said, simply, the GOP candidate "doesn't know what he's talking about."

He has also gone after Christie for his Trump endorsement, calling the New Jersey governor, who he has in the past commended, "disgraceful."

Image placeholder title

12. Marlene Ricketts

Marlene Ricketts, the wife of billionaire T.D. Ameritrade (AMTD) - Get Report founder J. Joe Ricketts and owner of the Chicago Cubs, initially placed her bets on Wisconsin Governor Scott Walker and the super PAC backing him, Unintimidated PAC. But when he dropped out, she turned her attention to the #NeverTrump movement, quietly giving millions of dollars to the anti-Trump Our Principles PAC.

When Trump caught wind of the donations, he took to Twitter with a threat against the company, warning, "They better be careful, they have a lot to hide!"