Blaine Browers
Analyst · Stifel
Thank you, Brad. So we're going to Slide 9 and 10. Here we have detailed year-to-date results and how the business has performed, both in a higher growth and lower growth scenario.
First, if you compare 2019, we achieved about 1% top line growth. Both grew margin is about 5% as illustrated on Slide 10, and EBITDA was up 33%. So very strong results in that lower growth environment. Next, as we look to the 9-month period of 2021 versus the comparable 2020 carry, we achieved much stronger growth, expanding sales 9% organically. Increasing gross margin, 16% and EBITDA expand 32%.
So looking at Slide I'd like to make a point just on the bottom right of the chart around adjusted EBITDA conversion. In the 9-month period, that EBITDA conversion was over 96%. So we're very proud of our success in generating significant free cash flow. Also a, we don't have seasonality in our business, and more importantly, from a cash generation perspective with very low CapEx needs, about 1% of revenue annually.
Next slide, on Slide 11. Here, we have our pro forma capital structure, both before and after the IPO. So we used a portion of the proceeds to pay down debt as planned. We paid down $59.4 million of debt outstanding under our existing term loan and revolving loan. And we also, as mentioned in the results, entered into a new term loan as well as a revolving loan in the third quarter.
Our pro forma 9/30 post-IPO net leverage was reduced to about 2 terms, which provides a significant financial flexibility to grow organically and more importantly, inorganically through acquisitions. We do have a successful history of acquiring, integrating and optimizing asset-light businesses with high free cash flow models and take a very targeted approach.
We really think about acquisitions in 3 buckets. The first bucket is current core products in new markets, so in geographic expansion. The second bucket is really current core markets and new products, and then the final bucket we think about it is really expanding our portfolio of safety products outside of our current law enforcement and military markets. So for instance, fire, EMS and industrial safety. Now I'm going to turn it back over to Brad for concluding comments.