| Bad Dragon | business | Phoenix | June 2008 |
| Bad Robot Productions | television production company, film production company | Santa Monica | 1998 |
| Bain & Company | management consulting company | Boston | 1973 |
| Baker University | private not-for-profit educational institution, private university | — | 1858 |
| Baltimore and Ohio Railroad | railway company, business | Baltimore | 1827 |
| Bandcamp | music streaming service, digital distribution platform, online music store | Oakland | 2007 |
| Bang Bros | pornography website, pornographic film studio | Miami | 2004 |
| Bank of America | global systemically important bank, bank, business, enterprise, credit institution | Charlotte | 1784 |
| Bank of North America | bank, central bank | Philadelphia | 1781 |
| Bank of North Dakota | bank, business | Bismarck | 1919 |
| Bank One Corporation | business | Chicago | 1863 |
| Bard College | liberal arts college, private not-for-profit educational institution | — | 1860 |
| Barnard College | liberal arts college, private not-for-profit educational institution | — | 1889 |
| Barrett Firearms Manufacturing | organization, business, enterprise | Christiana | 1982 |
| Baruch College | public educational institution of the United States, university | New York City | 1919 |
| Basic Books | book publisher | New York City | 1950 |
| Baskin-Robbins | food manufacturing, business, enterprise, ice cream parlor chain | Canton | 1945 |
| Bates College | liberal arts college, private not-for-profit educational institution | — | 1855 |
| Bauer Hockey | business, public company | Exeter | 1927 |
| Bausch Health | pharmaceutical company, business, public company | Laval, Wilmington | 1960 |
| Baylor University | church college, private not-for-profit educational institution, private university | — | 1845 |
| Be Inc. | business | Menlo Park | 1990 |
| Beats Electronics | business, enterprise | Culver City | 2006 |
| Bell Telephone Company | business | — | July 9, 1877 |
| Bellator MMA | mixed martial arts organization, sports organization, business | Newport Beach | 2008 |
| BellSouth | business, enterprise, public company | Atlanta | 1984 |
| Beloit College | liberal arts college, private not-for-profit educational institution | — | 1846 |
| Ben & Jerry's | food brand, business, enterprise, ice cream parlor chain | South Burlington | 1978 |
| Benchmark | business, enterprise | Menlo Park | 1995 |
| Bennington College | college, private not-for-profit educational institution | Bennington | 1932 |
| Bentley Systems | business, public company | Exton | 1984 |
| Berea College | liberal arts college, private not-for-profit educational institution, school | Berea | 1855 |
| Berklee College of Music | private not-for-profit educational institution, college of music, private university | Boston | 1945 |
| Berkshire Hathaway | holding company, business, enterprise, company, public company | Omaha | 1839 |
| Best Buy | business, retail chain, enterprise, public company | Richfield | August 22, 1966 |
| Bethel University | church college, private not-for-profit educational institution, university | — | 1871 |
| Bethesda Softworks | video game publisher, video game developer | Rockville | 1986 |
| Bethlehem Shipbuilding Corporation | shipbuilding company | San Francisco | 1905 |
| Beverly Hills High School | public school, high school | — | 1927 |
| Beverly Hills Hotel | hotel, hotel building | — | 1911 |
| Bicycle Playing Cards | business | Erlanger | — |
| 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 |
| Bio-Rad Laboratories | business, public company | Hercules | 1952 |
| Biogen | biopharmaceutical company, business, public company | Cambridge | 1978 |
| Biograph Company | film production company | New York City | December 1895 |
| Biola University | church college, private not-for-profit educational institution, seminary, private university | — | 1908 |
| BioRxiv | document repository, preprint server, disciplinary repository | — | November 2013 |
| Bishop Museum | nonprofit organization, museum building, museum, academic publisher | Honolulu | 1889 |
| BitChute | dot-com company, online video platform | Sheridan, Gravesend | January 2017 |
| Bitly | business, URL shortener | New York City | 2008 |
| Black Diamond Equipment | business, enterprise, public company | Holladay | December 1, 1989 |
| Black Mountain College | arts venue, university building, art academy | — | 1933 |
| BlackRock | business, company, public company | New York City | 1988 |
| Blackstone Inc. | asset management company, business, enterprise, public company | New York City | 1985 |
| Blaze Media | news agency, website, video streaming service | Irving | September 12, 2011 |
| Blinding Edge Pictures | film production company, business | Berwyn | 1999 |
| Blockbuster LLC | brand, business, enterprise | Dallas | 1985 |
| Bloomberg L.P. | business, enterprise | New York City, 731 Lexington Avenue | October 1, 1981 |
| Bloomberg News | news agency | New York City | 1990 |
| Blu Products | business | Doral, Paramount | 2009 |
| Blue Sky Studios | animation studio, film production company | Greenwich | February 22, 1987 |
| Bluehost | official website, business, web hosting service | Provo | 2022 |
| Bluepoint Games | video game developer | Austin | March 9, 2006 |
| BlueSky Software | video game developer | California | 1988 |
| Blumhouse Productions | film production company | Los Angeles | 2000 |
| BMC Software | business, enterprise | Houston | 1980 |
| BNSF Railway | railway company, railway network | Fort Worth | September 22, 1995 |
| Bob Jones University | private for-profit educational institution, seminary | — | 1927 |
| Bobcat Company | business | West Fargo | 1947 |
| Boeing | rail vehicle manufacturer, public company, aerospace manufacturer | Chicago | 1934 |
| Boeing Rotorcraft Systems | aerospace manufacturer | United States | 1960 |
| Boise State University | public educational institution of the United States, university | — | 1932 |
| Booking Holdings | business, enterprise, public company | Norwalk | July 1997 |
| 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 Dynamics | business | Waltham | November 6, 1992 |
| Boston Scientific | business, medical device company, enterprise, public company | Marlborough | June 29, 1979 |
| Botanical Society of America | nonprofit organization, open-access publisher, professional association | St. Louis | 1893 |
| Bowdoin College | liberal arts college, private not-for-profit educational institution | Brunswick | 1794 |
| Box | website, business, enterprise, public company | Redwood City | May 2009 |
| Branded Entertainment Network | photo library, advertising agency, photo agency | Seattle, Los Angeles | 1989 |
| Brandeis University | private not-for-profit educational institution, university | Waltham | October 20, 1948 |
| Brandywine Productions | film production company | United States | 1960 |
| Breeze Airways | airline | Cottonwood Heights | July 31, 2018 |
| Brewster Aeronautical Corporation | aerospace manufacturer | — | 1932 |
| Brigham Young University–Idaho | private not-for-profit educational institution, university | Rexburg | — |
| Brightstar Corporation | business | Miami | 1997 |
| Broadcom | business, enterprise | Palo Alto | 1961 |
| Broadwood and Sons | business, musical instrument manufacturing company | New York City, London | 1732 |
| Brooklyn–Manhattan Transit Corporation | business | Brooklyn | 1923 |
| Brooks Brothers | business, enterprise, brick and mortar | New York City | 1818 |
| Browning Arms Company | organization, business, enterprise | Morgan | 1927 |
| Brunswick Corporation | conglomerate, public company | Lake Forest | 1845 |
| Bryn Mawr College | private not-for-profit educational institution, women's college, university | Bryn Mawr | 1885 |
| Bucknell University | publishing house, private not-for-profit educational institution, private university | — | 1846 |
| Bucyrus International | business, enterprise, public company | South Milwaukee | 1880 |
| Budget Rent a Car | business | Chicago, Parsippany-Troy Hills | 1958 |
| Build-A-Bear Workshop | business, public company | St. Louis | 1997 |
| Bunge Limited | business, enterprise, public company | Hamilton, White Plains | 1818 |
| Burger King | fast food restaurant chain | Miami-Dade County | 1954 |
| Burlington Northern Railroad | railway company | Fort Worth, Saint Paul, Seattle | March 2, 1970 |
| Burton Snowboards | business | Burlington | 1977 |
| BVS Entertainment | film production company | Los Angeles | 2001 |