In 2014, we saw the Alibaba (BABA - Analyst Report) initial public offering become the largest ever IPO, as the company generated over $22 billion in revenue in its first day of trading.

This year, we’ve seen a lot of notable IPOs, with Etsy (ETSY -Snapshot Report), GoDaddy (GDDY), and Shake Shack (SHAK - Snapshot Report) among the names that stick out. And while we haven’t had any record breaking IPOs like that of Alibaba, there have been some massive first days this year.

Although there are sure to be several more notable IPOs in the final months of 2015 (fingers crossed for Uber!) we wanted to highlight the biggest so far this year. Below are the five biggest IPOs of 2015, based on revenue generated on the company’s first day on the market.

5. Blue Buffalo Pet Products (BUFF)

Those who don’t own pets may have never heard of this company before, but this maker of premium, all-natural pet food really shook up the market this year. With an IPO price of $20 per share, Blue Buffalo soared on its first day, closing at +36%. The stock has since been a bit of a rollercoaster, but it still sits well above its IPO price, with shares currently trading around $27. With $677 million raised on its first day, Blue Buffalo sits at number five on our list.

4. Fitbit (FIT - Snapshot Report)

Fitbit, a manufacturer of wearable fitness tracking devices, held one of the most widely publicized IPOs this year. This trendy tech company proved that it could be a legitimate force on Wall-Street, as shares soared over 48% from the IPO price of $20. At one point this year, the stock was over $50 per share. Even with current prices of $37 per share, Fitbit has been relatively successful since its IPO. With $732 million generated, Fitbit’s IPO sits at number four on our list.

3. Univar (UNVR - Snapshot Report)

This Chicagoland-based chemical company offers everything from resins to acids, but its IPO offered investors and interesting day of trading. Univar set its IPO price at $22 per share, and by the closing bell, the stock was up 15.5%. However, the rug has since been pulled out from beneath Univar’s shares, as they’ve fallen all the way back down, and the stock is currently trading slightly below its IPO price. However, after raising $770 million on its first day of trading, Univar is at the number three spot on our list.

2. Columbia Pipeline Partners (CPPL - Snapshot Report)

After spinning off from utilities provider NiSource, this operator of natural gas pipelines had quite the interesting IPO. With an opening price of $23 per share, CPPL was able to close up a solid 16.5%. It has been a rocky road for this stock since the IPO though, and current share prices are below the IPO price. This was a big money IPO, however, and by raising $1.077 billion in the first day of trading, CPPL finds itself at number two on our list.

1. Tallgrass Energy (TEGP - Snapshot Report)

Another energy transportation company, Tallgrass is engaged in the transport of natural gas and crude oil. TEGP had the weakest return out of the stocks on our list, and after setting an IPO price of $29 per share, the stock closed up just 9.5%. Current share prices are just about 50 cents over the original IPO price. However, Tallgrass is our biggest company on the list. The company raised $1.204 billion on its first day of trading, giving it the distinction of the biggest IPO of 2015.