You can nominate between 3 to 9 top private cleantech companies (i.e. independent, for-profit companies not listed on any major stock exchange, or majority-owned subsidiaries of another company).
For every company anyone nominates with which they have an association (i.e. financially invested in the company), they must nominate two others with which they do not, but which they admire. Otherwise, your nominations will be invalid under the Global Cleantech 100 Methodology.
You can also nominate yourself, and at least two other private companies.
The deadline to submit your nominations is May 31st, 2018.