| CUSIP No. 443573100 | 13G | Page 6 of 8 |
EXHIBIT 1
JOINT FILING AGREEMENT
Pursuant toRule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of shares of HubSpot, Inc.
EXECUTED this 13th day of February, 2017
| GENERAL CATALYST GROUP V, L.P. | ||||||
| By: | GENERAL CATALYST PARTNERS V, L.P. its General Partner | |||||
| By: | GENERAL CATALYST GP V, LLC its General Partner | |||||
| By: | /s/ Christopher McCain | |||||
| Christopher McCain | ||||||
| Chief Legal Officer | ||||||
| GC ENTREPRENEURS FUND V, L.P. | ||||||
| By: | GENERAL CATALYST PARTNERS V, L.P. its General Partner | |||||
| By: | GENERAL CATALYST GP V, LLC its General Partner | |||||
| By: | /s/ Christopher McCain | |||||
| Christopher McCain | ||||||
| Chief Legal Officer | ||||||
| GENERAL CATALYST PARTNERS V, L.P. | ||||||
| By: | GENERAL CATALYST GP V, LLC its General Partner | |||||
| By: | /s/ Christopher McCain | |||||
| Christopher McCain | ||||||
| Chief Legal Officer | ||||||
| CUSIP No. 443573100 | 13G | Page 7 of 8 |
| GENERAL CATALYST GP V, LLC | ||||
| By: | /s/ Christopher McCain | |||
| Christopher McCain | ||||
| Chief Legal Officer | ||||
| By: | * | |||
| Joel E. Cutler | ||||
| By: | * | |||
| David P. Fialkow | ||||
| *By: | /s/ Christopher McCain | |||
| Christopher McCain | ||||
| Asattorney-in-fact | ||||
This Agreement was executed by Christopher McCain on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which is attached as Exhibit 2.
