The IPO markets are quiet this week, but there's excitement building. Lyft announced that it will be on offer ahead of its larger rival ridesharing company, Uber. Pinterest also filed confidentially last week as the latest big name IPO to want to list. Slack and Airbnb are two other major names likely to launch this year, provided the broad markets continue to provide an environment for IPOs to be confident in their valuations. A fintech offering or two may even be in the works.

Still, for this week we just a have a few names looking to raise about $350 million in total.

First up, the largest offering of the week is a blank check company which hopes to raise $225 million to focus on acquisitions in the energy space. Tortoise Acquisition (SHLL  ) will offer 22.5 million shares at $10 to achieve their goal.

The largest in terms of valuation is Kaleido Biosciences (KLD  ), which is coming to market with a valuation just over $700 million. Their management team is led by some former executives at big pharma. They plan to offer 4.7 million shares at a range of $20 -$22.

The last name of the week is in the fast pace, e-sports gaming space. Super League Gaming (SLGG  ) also happens to be the only IPO this week that has any sales. Though the company is still unprofitable, they are looking to further capitalize on the space by offering 2.2 million shares at a range of $10 - $12 in hopes of raising $25 million. With about $1 million in revenue for the last 12 months, they are coming to market with a valuation of just about $100 million.