As many as 11 candidates competed in the race at one time.
Paul Tonko, Tracy Brooks, Darius Shahinfar, Steck and Joseph Sullivan continue to seek the Democratic nomination. Tonko led all Democrats, obtaining more than 7,000 signatures with the aid of more than 300 volunteers.
Jim Buhrmaster and Steven Vasquez will continue their quest for the Republican nomination.
Buhrmaster collected more than 8,000 signatures, the most of any Republican.
Because there is a period reserved to file objections, according to the state's board of elections, no one is officially on the ballot as of yet. However, the board of elections did confirm with Spotlight Newspapers that Republicans Buhrmaster and Vasquez are officially filed with the state, and that Democrats Brooks, Shahinfar, Steck, Sullivan and Tonko have all met the petition requirement to run in the 21st.
On the third-party lines, Tonko has filed for the Working Families Party, Steck filed for the Independence Party line, and Buhrmaster filed for the Conservative line, according to the state board of elections.
Two former candidates threw their endorsements behind current candidates after they dropped out of the race. Freeman endorsed Tonko, and Burridge has not only endorsed Brooks, but has now joined her campaign.
The seven remaining candidates will seek a spot on the ballot for their respective party primaries in September.
Ross Marvin contributed to this story,""