• Virgin Orbit is again extending its unpaid pause in operations to continue pursuing a lifeline investment, CEO Dan Hart told employees in a company-wide email.
• Some of the company's late-stage deal talks, including with private investor Matthew Brown, collapsed over the weekend, people familiar with the matter told CNBC.
• "Our investment discussions have been very dynamic over the past few days, they are ongoing, and not yet at a stage where we can provide a fulsome update," Hart wrote in an email to employees, which was viewed by CNBC.

Virgin Orbit is again extending its unpaid pause in operations to continue pursuing a lifeline investment, CEO Dan Hart told employees in a company-wide email.

Some of the company's late-stage deal talks, including with private investor Matthew Brown, collapsed over the weekend, people familiar with the matter told CNBC.

Hart previously planned to update employees on the company's operational status at an all-hands meeting at 4:30 p.m. ET on Monday afternoon, according to an email sent to employees Sunday night. At the last minute, that meeting was rescheduled "for no later than Thursday," Hart said in the employee memo Monday.

"Our investment discussions have been very dynamic over the past few days, they are ongoing, and not yet at a stage where we can provide a fulsome update," Hart wrote in the email to employees, which was viewed by CNBC.

Brown told CNBC's "Worldwide Exchange" last week he was in final discussions to invest in the company. A person familiar with the terms told CNBC the investment would have amounted to $200 million and granted Brown a controlling stake. But discussions between Virgin Orbit and the Texas-based investor stalled and broke down late last week, a person familiar told CNBC. As of Saturday those discussions had ended, the person said.

Separately, another person said talks with a different potential buyer broke down on Sunday night.

The people asked to remain anonymous to discuss private negotiations. A representative for Virgin Orbit declined to comment.

Hart promised Virgin Orbit's over 750 employees "daily" updates this week. Most of the staff remain on an unpaid furlough that Hart announced on Mar. 15. Last week, a "small" team of Virgin Orbit employees returned to work in what Hart described as the "first step" in an "incremental resumption of operations," with the intention of preparing a rocket for the company's next launch.

Virgin Orbit's stock closed at 54 cents a share on Monday, having fallen below $1 a share after the company's pause in operations.

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Virgin Orbit developed a system that uses a modified 747 jet to send satellites into space by dropping a rocket from under the aircraft's wing mid-flight. But the company's last mission suffered a mid-flight failure, with an issue during the launch causing the rocket to not reach orbit and crash into the ocean.

The company has been looking for new funds for several months, with majority owner Sir Richard Branson unwilling to fund the company further.

Virgin Orbit was spun out of Branson's Virgin Galactic in 2017 and counts the billionaire as its largest stakeholder, with 75% ownership. Mubadala, the Emirati sovereign wealth fund, holds the second-largest stake in Virgin Orbit, at 18%.

The company hired bankruptcy firms to draw up contingency plans in the event it is unable to find a buyer or investor. Branson has first priority over Virgin Orbit's assets, as the company raised $60 million in debt from the investment arm of Virgin Group.

On the same day that Hart told employees that Virgin Orbit was pausing operations, its board of directors approved a "golden parachute" severance plan for top executives, in case they are terminated "following a change in control" of the company.