JOINT FILERS’ SIGNATURES
| INSIGHT HOLDINGS GROUP, LLC | ||
| By: | /s/ Blair Flicker | Date: March 22, 2019 |
| Name: | Blair Flicker | |
| Title: | Attorney-in-Fact | |
| IVP CIF II (AIP B), L.P. | ||
| By: | Insight Venture Associates Coinvestment II, L.P., its general partner | |
| By: | /s/ Blair Flicker | Date: March 22, 2019 |
| Name: | Blair Flicker | |
| Title: | Vice President | |
| IVP CIF II (PS SPLITTER), L.P. | ||
| By: | Insight Venture Associates Coinvestment II, L.P., its general partner | |
| By: | /s/ Blair Flicker | Date: March 22, 2019 |
| Name: | Blair Flicker | |
| Title: | Vice President | |
| INSIGHT VENTURE ASSOCIATES COINVESTMENT II, L.P. | ||
| By: | /s/ Blair Flicker | Date: March 22, 2019 |
| Name: | Blair Flicker | |
| Title: | Authorized Officer | |
| IVP CIF II (AIP A), L.P. | ||
| By: | Insight Venture Associates Coinvestment II, L.P., its general partner | |
| By: | /s/ Blair Flicker | Date: March 22, 2019 |
| Name: | Blair Flicker | |
| Title: | Vice President | |