| Bohemian Club | gentlemen's club, private press, club | San Francisco | April 1872 |
| Boise State University | public educational institution of the United States, university | — | 1932 |
| Bongo Comics Group | book publisher, business | Santa Monica | 1993 |
| Booking Holdings | business, enterprise, public company | Norwalk | July 1997 |
| Books LLC | publishing house | Memphis | 2010 |
| Booth School of Business | business school | — | 1898 |
| Booz Allen Hamilton | business, public company | Tysons | 1914 |
| Borders Group | business, enterprise | Ann Arbor | 1971 |
| BorgWarner | business, enterprise, public company | Auburn Hills | 1880 |
| Bose Corporation | business, enterprise | Framingham | 1964 |
| Boston Beer Company | brewery, public company | Boston | 1985 |
| Boston College | college, private not-for-profit educational institution, university, open-access publisher | Chestnut Hill | 1863 |
| Bowdoin College | liberal arts college, private not-for-profit educational institution | Brunswick | 1794 |
| Bowling Green State University | public educational institution of the United States, open-access publisher, public university | — | 1910 |
| Box Office Mojo | film database, business | — | 1999 |
| Brandeis University | private not-for-profit educational institution, university | Waltham | October 20, 1948 |
| Brandywine Productions | film production company | United States | 1960 |
| Braum's | restaurant chain, business | Oklahoma City | 1968 |
| Breeze Airways | airline | Cottonwood Heights | July 31, 2018 |
| Brewster Aeronautical Corporation | aerospace manufacturer | — | 1932 |
| Briggs & Stratton | business, public company | Milwaukee | 1908 |
| Brigham Young University–Hawaii | private not-for-profit educational institution, university | — | 1955 |
| Brightline | railway company, passenger train service | New York City | January 1, 2003 |
| Broadcom | business, enterprise | Palo Alto | 1961 |
| Brooklyn Academy of Music | theatre company, nonprofit organization, performing arts building | Brooklyn | 1908 |
| Brooks Sports | business, subsidiary company | Münster, Seattle | 1914 |
| Broward College | public educational institution of the United States | — | 1959 |
| Brunswick Corporation | conglomerate, public company | Lake Forest | 1845 |
| Brushfire Records | record label, record company | Los Angeles | 2002 |
| Bryn Mawr College | private not-for-profit educational institution, women's college, university | Bryn Mawr | 1885 |
| Budd Company | business, aerospace manufacturer | Philadelphia | 1912 |
| Buena Vista | brand name, film distributor | Burbank, Glendale | 1953 |
| Buick | car brand, division, automobile manufacturer, public company | Detroit | December 1899 |
| Bulova Watch Company | business, subsidiary company | New York City | 1875 |
| Burlington | business, public company | Florence | 1972 |
| Burlington Northern Railroad | railway company | Fort Worth, Saint Paul, Seattle | March 2, 1970 |
| Burton Snowboards | business | Burlington | 1977 |
| Bushmaster Firearms International | business | Madison | 1973 |
| Business Wire | website, information resource, business | San Francisco | 1961 |
| BVS Entertainment | film production company | Los Angeles | 2001 |
| Cabot Corporation | business, public company | Boston | 1882 |
| CACI | corporation, public company | Arlington County | July 17, 1962 |
| Caesars Entertainment Corporation | business, enterprise | Las Vegas, Paradise | 1937 |
| Calico | business | San Francisco | September 18, 2013 |
| California Baptist University | church college, private not-for-profit educational institution, university | — | 1950 |
| California Institute of Technology | private not-for-profit educational institution, university | California | 1891 |
| California State Polytechnic University, Pomona | public educational institution of the United States, university | — | 1949 |
| California State University | state university system, university | Long Beach | 1857 |