Electric car maker Tesla and space company SpaceX, both led by Elon Musk, are facing a number of new sexual harassment complaints.
Six current and former employees of Tesla California have now filed a lawsuit alleging "nightmarish" working conditions.
In the past few weeks, Tesla has been sued by two other women.
Roland Lindner
Business correspondent in New York.
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Meanwhile, a former SpaceX employee has published a blog entry complaining that "countless" colleagues have made her sexual advances.
Several other former employees made similar allegations in interviews with the "New York Times" and "The Verge".
Some of the women also blamed Musk himself.
One of the Tesla plaintiffs told the Washington Post that Musk's sometimes slippery tweets incited her male colleagues.
David Lowe, the plaintiffs' attorney, spoke of an "attitude at the top" that enabled a "pattern of ubiquitous sexual harassment and retribution."
Unwanted touch
In the lawsuits against Tesla, the women said, among other things, they had been exposed to slippery comments about their bodies and unwanted touch.
Some said they started putting on extra baggy clothes to keep colleagues away.
Complaints to the HR department would not have led to anything.
Tesla has not yet commented on the allegations.
Former SpaceX employee Ashley Kosak wrote in her entry on the online platform Lioness that she had been repeatedly touched by colleagues.
Every time she informed the HR department, nothing was done.
Rather, she was told that such matters were too private to confront her male colleagues openly.
Musk does not hold them directly responsible for these incidents.
However, she accuses him of seeing engineers only as “resources” and driving them to the brink of “burnout”.
SpaceX has not commented on the allegations either.
However, shortly before the publication of Kosak's allegations, Gwynne Shotwell, who heads day-to-day operations as chief operating officer, drew attention to the company's policies against sexual harassment in an internal message.