And they aren't fans of crying in business. When entrepreneur Mikki Bey became emotional during her 2015 pitch on the show for her company Mikki Bey Eyelash Extensions, Barbara Corcoran advised her to remain in control.
"You've got to give up this crying stuff," Corcoran said.
Kevin O'Leary agrees, and he has held firm on that since the beginning of the show. In "Shark Tank's" first episode, O'Leary told Tod Wilson, owner of Mr. Tod's Pie Factory, "Don't cry about money, it never cries for you."
Judge Lori Greiner asked her audience to weigh in on the topic on Twitter, and 75 percent of those who replied said that they "hate it" when "entrepreneurs start crying."
The stories of a few inspiring entrepreneurs have been so heartfelt that even the judges have cried, in spite of their own preference for remaining professional.
Here are three pitches that had the sharks reaching for a Kleenex and how their businesses are doing today.