The probe is focusing in particular on how trading was handled on the first day the company went public, a report from The Wall Street Journal says.
Slack also said that VC Chamath Palihapitiya will be stepping down from its board of directors.
A Wall Street firm has rated Slack's stock as underperform because it sees competition from Microsoft Teams hurting Slack's future growth prospects in a critical market.
The Securities and Exchange Commission filing provides the first in-depth look at WeWork's financial results.
Apple keeps adding new emojis to its keyboard every year. But why is there no easy way to search for any emoji you want? Other services have this.
Index Ventures partner Sarah Cannon joined Slack's board as an observer as the team was evaluating options for the company's public debut.
Slack insiders are set to reap some big paydays, now that the company is publicly-traded and worth over $20 billion.
Slack relied on internal data about secondary markets to gauge its valuation internally, a source told Business Insider.
Accel's success gives pause to this idea that the venture capital model is really being blown up, as is the trendy talk these days.
The top four corporate venture capital funds have invested more than $2 billion across 76 startups since 2013.
Slack updated its S-1 on Monday to reveal a new ticker symbol from the one it originally filed to go public with.
Slack Chief Financial Officer Allen Shim gave a presentation to analysts on Monday ahead of the company's planned direct listing IPO.
Slack says one of its directors made "unauthorized statements" which may violate "quiet period" rules in its IPO.
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Healthcare represents a large market opportunity for Slack if it sorts out HIPAA compliance.
Slack insiders are set to reap some big paydays when the workplace messaging company goes public.
Slack filed the paperwork to go public on Friday, and its listing is right around the corner.