S-1 (IPO) filings

After several notable IPOs in the past few weeks, I was curious whether there was an increase in overall IPOs in 2019.
The data below was extracted from last 4 years of SEC S-1 filings on EDGAR.
Feel free to use the raw TSV data (download) for further analysis.
(This was a quick, afternoon project so beware of any data inaccuracies.)