Lyft went public at a $24 billion valuation. Here's how that compares to other high-profile tech companies dating back to the dotcom bubble.

Expected IPO date: April 2019

Estimated IPO value: $120 billion

2018 revenue: $11.3 billion, the company said earlier this year.

Price-to-sales ratio: 10.5x

Expected IPO date: 2019. Pinterest filed its S-1 with the Securities and Exchange Commission in March.

Estimated IPO value: $12.3 billion, according to a Wall Street Journal analysis of Pinterest's S-1.

Revenue: $755.9 million

Price-to-sales ratio: 16.3x

Expected IPO date: 2019, but the co-founder said in comments to Business Insider in March that it may not go public this year.

Estimated IPO value: $31 billion

Estimated revenue: $2.76 billion

Price-to-sales ratio: 11.2x

Expected direct listing date: The first half of 2019, according to The Wall Street Journal, citing people familiar with the company's plans. Slack confidentially filed its S-1 with the Securities and Exchange Commission in February.

Estimated direct listing value: Slack was most recently valued at $7 billion

Estimated revenue: $221 million

Price-to-sales ratio: 45.3x

Expected IPO date: As soon as the second half of 2019, according to The Wall Street Journal, citing people familiar with the matter.

Estimated IPO value: $41 billion

Estimated revenue: $750 million

Price-to-sales ratio: 54.6x

IPO date: March 1, 2017

IPO value: $24 billion

Revenue: $404.5 million

Price-to-sales ratio: 59.3x

IPO date: September 18, 2014

IPO value: $168 billion

Revenue: $8.44 billion

Price-to-sales ratio: 19.9x

IPO date: November 6, 2013

IPO value: $14.2 billion

Revenue: $639.8 million

Price-to-sales ratio: 22.2x

IPO date: May 17, 2012

IPO value: $104 billion

Revenue: $3.711 billion

Price-to-sales ratio: 28x

IPO date: September 23, 1998

IPO value: $715 million

Revenue: $14.922 million

Price-to-sales ratio: 47.9x

IPO date: May 14, 1997

IPO value: $413 million

Revenue: $15.75 million

Price-to-sales ratio: 26.2x

IPO date: April 11, 1996

IPO value: $334 million

Revenue: $1.41 million

Price-to-sales ratio: 238.6x

IPO date: August 8, 1995

IPO value: $927 million

Revenue: $5.4 million

Price-to-sales ratio: 171.6x