Slack reports Q4 revenue of $181.9M, up 49% YoY, beating expectations, but issues disappointing Q1 forecast; stock is down ~20% after hours (Ari Levy/CNBC)

Ari Levy / CNBC:
Slack reports Q4 revenue of $181.9M, up 49% YoY, beating expectations, but issues disappointing Q1 forecast; stock is down ~20% after hours  —  – Slack shares plunged 20% on a disappointing forecast for the fiscal first quarter.  — The stock sank along with the broader market during regular trading on Thursday.