Dive summary: 

• PubMatic, an ad technology company that caters to publishers, is on track to add 100 new employees to its current 350 by the end of this year because of a booming demand for private ad exchanges. 
• According to eMarketer, programmatic spending is expected to grow by 74% this year, and PubMatic is taking advantage of that growth with new hires, four new offices and three new data centers. 
• PubMatic Co-Founder and CEO Rajeev Goel says the company saw sales of private exchange inventory jump from 1% earlier this year to a current 10%. 

From the article: 

"For ad-tech companies, a spike in sales and marketing spending, which Mr. Goel said will make up half the additional headcount, can often precede a filing to go public. When asked if PubMatic is itself preparing to IPO, Mr. Goel did not shy away from the notion."