| 100% | DEANNA | 6 | Brett Favre's wife and co-founder of the Favre 4 Hope Foundation in 1995 |
| 39% | SEALE | 5 | Texan Bobby, co-founder of the Black Panthers and defendant in the "Chicago Eight" |
| 38% | FITT | 4 | Gerry —, co-founder and first leader of the SDLP in Northern Ireland in 1970 |
| 36% | MOAT | 4 | John —, poet and novelist who co-founded the Arvon Foundation in 1968 |
| 36% | ELON | 4 | Co-founder, with his brother Kimbal, of "Zip2" in 1995, acquired by Compaq 4 years later for $340 million |
| 35% | GALAXY | 6 | Groups of stars and matter found in the universe |
| 35% | FITT | 4 | Gerry —, co-founder and first leader in 1970 of the SDLP in Northern Ireland |
| 35% | LINACRE | 7 | Thomas —, chief founder and first president of the Royal College of Physicians in London |
| 35% | BEES | 4 | Busy buzzers ... and letters found at the start of every clue in this puzzle |
| 35% | HEDYLAMARR | 10 | Actress and co-inventor of the spread-spectrum technology used in Bluetooth |
| 35% | IANPAISLEY | 10 | Northern Ireland religious and political leader who died in 2014; co-founder of the Free Presbyterian Church of Ulster |
| 35% | EBEN | 4 | __ Upton, co-founder of the U.K.'s Raspberry Pi Foundation |
| 34% | DANIELHARDMAN | 13 | Co-founder of the firm in "Suits" who was the former managing partner before Jessica Pearson and is portrayed by David Costabile: 2 wds. |
| 34% | ABRAHAM | 7 | Father of Isaac and founder of the Hebrew people in the Old Testament |
| 34% | MARY | 4 | & 25A Founder of the National Viewers' and Listeners' Association who died in 2001 |
| 34% | TOPHATS | 7 | Partners of tails ... and what's found in the answers to starred clues |
| 34% | BROKENHEART | 11 | Lover's woe ... or something found, literally, in the 4th, 5th, 8th and 11th rows of this puzzle |
| 33% | CHANGEOFPACE | 12 | Welcome break in one's routine, or the progression found at the starts of 20-, 33-, and 43-Across |
| 33% | JEBBUSH | 7 | Founder of the Foundation for Florida's Future |
| 33% | ANNLEE | 6 | Founder of the Shakers, in the U.S. |
| 33% | FIRTH | 5 | Colin ___, actor who played Mr. Darcy in the 1995 adaptation of Jane Austen's "Pride and Prejudice" |
| 33% | RIA | 3 | Long, narrow inlet of the sea coast found especially in SW Ireland and NW Spain |
| 33% | CARLFOGARTY | 11 | British winner of the Superbike World Championship in 1994, 1995, 1998 and 1999 |
| 33% | CURIE | 5 | Irene and Frederic Joliot-___, co-winners of the 1935 Nobel Prize in Chemistry |
| 33% | HIDDENFIGURES | 13 | Oscar-nominated film about NASA mathematicians, and a description of the countdown found in this puzzle? |
| 33% | JOHN | 4 | Lennon who was the founder and co-lead vocalist of The Beatles |
| 33% | PEGG | 4 | Simon who co-wrote and co-starred in "Shaun of the Dead" |
| 33% | REYNOLDS | 8 | Co-star of Kelly and O'Connor in "Singin' in the Rain" |
| 32% | LEIGH | 5 | Co-star of the film whose title is hidden sequentially in 20-, 34-, 41- and 52-Across |