Cox died on June 16 after being shot and stabbed outside a library in her constituency.
Brendan Cox spoke about his late wife Tuesday evening.
The fund's organizers will divide the money between three charities Cox supported.
She had also recorded a video about preventing Islamophobia.
Anti-racism campaigner Nick Lowles feels both pain and anger at Cox's death.
Witnesses said a man shot at Cox with what looked like an "old" or "makeshift" gun.
The 52-year-old had a history of mental illness, his brother said.