President-elect Donald Trump sold off his shares of Energy Transfer Partners, the owner of the Dakota Access pipeline, as part of a large sell-off of all his stocks in June.

On Tuesday, his spokesman Jason Miller confirmed on the daily transition conference call that Trump had offloaded all his shares in companies in early summer, shortly after becoming the GOP nominee.

That closes the door on a number of conflict of interest claims that could have plagued the president-elect through his first term.

President-elect Donald Trump offloaded his stock portfolio in June, spokesman Jason Miller told reporters today

Donald Trump's investments were making news as today he railed Boeing, a stock he owned, for an overly-expensive Air Force One. Another investment, Energy Transfer Partners, was in the news over protests of the Dakota Access pipeline

In May, a month before the sell-off, Trump filed personal financial disclosure documents that showed he owned an array of stock in banks, oil companies and other businesses that do business with the federal government, according to reporting from the Washington Post.

The portfolio was worth about $40 million as of December 2015, according to the May disclosure.

His Energy Transfer Partners investments were worth between $500,000 and $1 million.

If Trump had held onto such stocks, he could have made decisions in office that would have increased their value – and funneled money into his own coffers.

He proved how powerful just his words are earlier today when taking to Twitter to complain about the cost of a new Air Force One plane, being built by Boeing – a stock the president-elect used to own.

The protests over the Dakota Access pipeline haven't done great things for Energy Transfer Partners' stock, a stock Donald Trump previously owned

'Boeing is building a brand new 747 Air Force One for future presidents, but costs are out of control, more than $4 billion. Cancel order!' Trump wrote.

Five hours later and Boeing's stock had slid.

Before the tweet it was trading at $152.16, according to Marketwatch, and dipped down to $149.75 immediately after. It moved up again to $150.85.

By midday trade the aerospace giant's stock was down 86 cents, meaning Trump could have cost shareholders a cool $550 million.

Trump's May disclose showed that he owned between $50,000 and $100,000 worth of Boeing stock.

The Washington Post had originally reported the sell-off of the Energy Transfer Partners stock on November 23.

At the time, Trump's spokeswoman Hope Hicks said she didn't know why Trump had offloaded the stock, which has taken a hit in recent months because of the protests over the controversial pipeline project.

Hicks also couldn't say whether Trump had sold shares of any other stocks.

As president, Trump would have been subject to the STOCK Act, which would require him to publicly disclose any stock transactions worth over $1,000 within 45 days of the maneuvering.

He's also required to file periodic financial disclose forms, however the next one isn't due until May 2018.

Trump didn't publicly release his tax returns during his presidential run, citing an ongoing audit.