Zoom founder Eric Yuan has transferred about 18 million of his shares worth more than $6bn (£4.4bn), according to a regulatory filing.
Mr Yuan, who is also chief executive of the video-conferencing platform, moved roughly 40% of his stake in the company last week.
The shares were shown as gifts to unspecified beneficiaries last week.
Mr Yuan has seen his personal wealth rocket as Zoom became a household name during pandemic lockdowns.
An increasing number of students and professionals connected online boosting the fortunes of Zoom and its founder.
Mr Yuan started Zoom in 2011 and listed it on the US stock market in 2019, making him a billionaire. He is currently worth $13.7bn, according to Forbes.
A Zoom spokesperson said the transfers were related to Mr Yuan’s estate planning practices. “The distributions were made in accordance with the terms of Eric Yuan and his wife’s trusts.”
Zoom’s shares have nearly tripled in the past 12 months and the company has a market valuation of around $100bn.
“Zoom founder Eric Yuan’s decision to transfer more than a third of his stake will raise some eyebrows,” Edward Moya, at trading firm Oanda, told the BBC.
“While a Zoom spokesperson noted that the transfer is consistent with the Yuans’ typical estate planning practices, investors will be nervous until we find out who is the recipient of the stock,” he added.
“Yuan is only 51, married and has three children, so the distribution of his wealth could be viewed as rushed.”
Student Covid tests for Christmas holiday from 30 November
Covid tests for students in England, so they can go home safely for Christmas, could begin on 30 November, according to a letter from the universities minister to vice chancellors.
A week of mass testing for students is proposed – running between 30 November and 6 December.
The letter, seen by the BBC, promises a fast turnaround for tests and “results within an hour”.
The aim is to stop students spreading the virus as they return home.
The first week of December, after the lockdown ends, could then become the “travel window” for many students to leave university for the Christmas holidays, with face-to-face teaching expected to finish earlier than usual this term.
But those who test positive will have to take another test and, if found to be infectious, have to stay in isolation.
Larissa Kennedy, president of the National Union of Students, said: “The government have finally listened to our calls to ensure that students can travel home safely for Christmas.
“We particularly welcome this mass-testing approach as it equips students with the knowledge to make informed decisions about travel ahead of the winter break,” she said.
‘Huge hurdles’
But the University and College Union, which represents university lecturers, said it was not yet clear whether all universities would take part in the testing programme or how many students would be included.
“There are huge hurdles to overcome to manage this process,” said union leader Jo Grady.
Around 1.2 million students are expected to move at Christmas from their university term-time address to a home in another part of the country, where there might be different levels of infection.
This has raised concerns among the Sage scientific advisers of a “significant risk” that this migration could spread the coronavirus.
To prevent this danger, plans are being made for mass testing using so-called “lateral flow tests”.
These nose and throat swabs are self-administered, with no need for tests to be sent to laboratories for results.
The letter from Universities Minister Michelle Donelan, and its accompanying documents, says: “The tests we are deploying have a high specificity which means the risk of false positive test results is low.
“Although the test does not detect all positive cases, it works extremely well in finding cases with higher viral loads – which is those who are most infectious.
“As the test is easy to administer and does not require a laboratory, testing can take place on a very regular basis,” the letter to university leaders said.
Free testing kits
Accompanying documents show a planning timetable in which sites are prepared for testing from 15 November, ready to operate the following week, with “pre end-of-term testing” between 30 November and 6 December.
The test kits will be given free to universities, which will have to provide a place for the tests to be carried out, in a way that can process thousands of students within a short time frame.
Ministers have already indicated that universities will stop in-person teaching two weeks before the end of term – so when students have been given the all-clear they could be expected to leave their term-time address and go home, in a “test and release” process.
This could mean that by about 9 December, many students will have left for Christmas.
There are also believed to have been discussions about how the departure of students can be made safe – such as co-ordinating staggered times for leaving between universities in the same city.
There could also be calls to avoid public transport – with suggestions of chartering coaches or using private transport, such as parents collecting students, and creating “travel corridors” to control traffic away from universities.
University leaders have previously raised concerns about why this guidance has been left so close to the end of term – and there will be questions about the capacity of universities to be ready in time for the mass testing.
There have also been questions about whether students will return as usual in January or whether there will be a staggered start and more testing, or whether more courses will switch online with some students initially studying from home.
Universities UK welcomed the plans for more testing capacity, but warned that universities would “now need clear assurance of the effectiveness of the tests as well as further details from the government on specific responsibilities under the proposed scheme including the governance, indemnity, resourcing and costs recovery”.
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