| Babcock & Wilcox | business, enterprise, public company | Charlotte, United States, New York City | 1867 |
| Babson College | private not-for-profit educational institution | — | September 3, 1919 |
| Backbone Entertainment | video game developer | Emeryville | 2003 |
| Bad Boy Records | record label, music publisher, imprint, music organization | Washington, D.C. | 1993 |
| Bad Robot Productions | television production company, film production company | Santa Monica | 1998 |
| Baen Books | book publisher, publishing house | Wake Forest | 1983 |
| Bain & Company | management consulting company | Boston | 1973 |
| Baker Hughes | business, enterprise, public company | Houston | 1987 |
| Baker Motor Vehicle | business, automobile manufacturer | Cleveland | 1899 |
| Baldwin Piano Company | business | Trumann | 1862 |
| Ball Aerospace & Technologies | former entity, subsidiary company, aerospace manufacturer | Boulder | 1956 |
| Baltimore Museum of Art | nonprofit organization, art museum, publishing house, museum building | Baltimore | 1914 |
| Banana Republic | business, enterprise, clothing store chain | San Francisco | 1978 |
| Bandcamp | music streaming service, digital distribution platform, online music store | Oakland | 2007 |
| Bantam Books | publishing house, imprint | New York City | 1945 |
| Bard College | liberal arts college, private not-for-profit educational institution | — | 1860 |
| Barry University | private not-for-profit educational institution, university | — | 1940 |
| Basecamp | business, enterprise | Chicago | 2004 |
| Baskin-Robbins | food manufacturing, business, enterprise, ice cream parlor chain | Canton | 1945 |
| Bates College | liberal arts college, private not-for-profit educational institution | — | 1855 |
| Bausch & Lomb | organization, business, enterprise, public company | Vaughan, Rochester | 1853 |
| Baylor University | church college, private not-for-profit educational institution, private university | — | 1845 |
| BBDO | advertising agency | New York City | 1891 |
| Be Inc. | business | Menlo Park | 1990 |
| BEA Systems | business, public company | San Jose | 1995 |
| Beacon Theatre | theatre building, movie theater | — | December 24, 1929 |
| Beatport | online music store, business | — | 2004 |
| Bechtel | organization, business, enterprise | Reston | 1906 |
| Bed Bath & Beyond Inc. | former entity, retail chain, public company | Wilmington | 1971 |
| Bell & Howell | production company, business | Wheeling | 1907 |
| Bell Labs | privately held company, publishing house, research institute | Murray Hill | 1925 |
| Bellagio Hotel & Casino | skyscraper, casino, hotel | — | 1998 |
| Beloit College | liberal arts college, private not-for-profit educational institution | — | 1846 |
| Benchmark | business, enterprise | Menlo Park | 1995 |
| Bendix Corporation | business | — | 1924 |
| Bennington College | college, private not-for-profit educational institution | Bennington | 1932 |
| Bentley University | private not-for-profit educational institution, university | Waltham | 1917 |
| Berea College | liberal arts college, private not-for-profit educational institution, school | Berea | 1855 |
| Bergdorf Goodman | department store, business | New York City | 1929 |
| Berkeley College | college, private for-profit educational institution | — | 1931 |
| Bethel University | church college, private not-for-profit educational institution, university | — | 1871 |
| Bethlehem Shipbuilding Corporation | shipbuilding company | San Francisco | 1905 |
| Bethlehem Steel | business, enterprise | Bethlehem | 1857 |
| Beverly Hills High School | public school, high school | — | 1927 |
| Beverly Wilshire Hotel | hotel, palace hotel | — | 1928 |
| BFG Technologies | business, enterprise | Lake Forest | 2002 |
| Bicycle Playing Cards | business | Erlanger | — |
| Big Boy Restaurants | restaurant chain, business | Warren | 1936 |
| Big Huge Games | video game developer | Timonium | February 2000 |
| Bigelow Aerospace | startup company, privately held company, business | North Las Vegas | 1999 |
| Billboard | periodical, weekly magazine, publishing house, website | New York City | 1894 |
| Biltmore Hotel | hotel | — | 1926 |
| Biogen | biopharmaceutical company, business, public company | Cambridge | 1978 |
| BioRxiv | document repository, preprint server, disciplinary repository | — | November 2013 |
| BitChute | dot-com company, online video platform | Sheridan, Gravesend | January 2017 |
| Bitly | business, URL shortener | New York City | 2008 |
| Blackboard | business, subsidiary company, public company | Washington, D.C. | 1997 |
| Bloomberg L.P. | business, enterprise | New York City, 731 Lexington Avenue | October 1, 1981 |
| Blu Products | business | Doral, Paramount | 2009 |
| BlueSky Software | video game developer | California | 1988 |
| BlueStacks | business | — | 2011 |
| Blumhouse Productions | film production company | Los Angeles | 2000 |
| Blur Studio | animation studio, business, enterprise | Venice | 1995 |
| BMG Rights Management | military division, record label, music publisher, business | Quartier 205 | October 1, 2008 |
| BNSF Railway | railway company, railway network | Fort Worth | September 22, 1995 |
| Bobcat Company | business | West Fargo | 1947 |
| Boeing | rail vehicle manufacturer, public company, aerospace manufacturer | Chicago | 1934 |
| 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 |