| Babcock & Wilcox | business, enterprise, public company | Charlotte, United States, New York City | 1867 |
| Babson College | private not-for-profit educational institution | — | September 3, 1919 |
| Baen Books | book publisher, publishing house | Wake Forest | 1983 |
| Bain & Company | management consulting company | Boston | 1973 |
| Baker Motor Vehicle | business, automobile manufacturer | Cleveland | 1899 |
| Baker University | private not-for-profit educational institution, private university | — | 1858 |
| Ball Corporation | business, enterprise, public company | Broomfield | 1880 |
| Banana Republic | business, enterprise, clothing store chain | San Francisco | 1978 |
| Bank of America Home Loans | business, credit institution | Charlotte | 2009 |
| Bank of America Merrill Lynch | business | Bank of America Tower | 2009 |
| Bantam Books | publishing house, imprint | New York City | 1945 |
| Bare Knuckle Fighting Championship | business | Philadelphia | 2018 |
| Barry University | private not-for-profit educational institution, university | — | 1940 |
| Baruch College | public educational institution of the United States, university | New York City | 1919 |
| Bates College | liberal arts college, private not-for-profit educational institution | — | 1855 |
| Bausch Health | pharmaceutical company, business, public company | Laval, Wilmington | 1960 |
| BBDO | advertising agency | New York City | 1891 |
| BEA Systems | business, public company | San Jose | 1995 |
| Beats Electronics | business, enterprise | Culver City | 2006 |
| Bechtel | organization, business, enterprise | Reston | 1906 |
| Beckman Coulter | business | Krefeld, Brea | 1935 |
| Bed Bath & Beyond Inc. | former entity, retail chain, public company | Wilmington | 1971 |
| Beechcraft | aerospace manufacturer | Beech Factory Airport | 1932 |
| Belden Incorporated | business, public company | St. Louis | 1902 |
| Bell Telephone Company | business | — | July 9, 1877 |
| Bentley Systems | business, public company | Exton | 1984 |
| Bentley University | private not-for-profit educational institution, university | Waltham | 1917 |
| Bergdorf Goodman | department store, business | New York City | 1929 |
| Berkeley College | college, private for-profit educational institution | — | 1931 |
| Berklee College of Music | private not-for-profit educational institution, college of music, private university | Boston | 1945 |
| Best Buy | business, retail chain, enterprise, public company | Richfield | August 22, 1966 |
| Best Western | hotel chain, business, enterprise | Phoenix | 1946 |
| Bethesda Game Studios | video game developer, subsidiary company | Rockville | 2001 |
| Bethlehem Shipbuilding Corporation | shipbuilding company | San Francisco | 1905 |
| Bethlehem Steel | business, enterprise | Bethlehem | 1857 |
| Big Boy Restaurants | restaurant chain, business | Warren | 1936 |
| Big Huge Games | video game developer | Timonium | February 2000 |
| Biltmore Hotel | hotel | — | 1926 |
| Biograph Company | film production company | New York City | December 1895 |
| BioRxiv | document repository, preprint server, disciplinary repository | — | November 2013 |
| Bishop Museum | nonprofit organization, museum building, museum, academic publisher | Honolulu | 1889 |
| Black Isle Studios | video game developer | Orange County | 1996 |
| Black Mountain College | arts venue, university building, art academy | — | 1933 |
| Blackboard | business, subsidiary company, public company | Washington, D.C. | 1997 |
| Blair House | building complex, guest house, chancery | — | 1824 |
| Blaze Media | news agency, website, video streaming service | Irving | September 12, 2011 |
| Blendtec | enterprise | Orem | 1975 |
| Blinding Edge Pictures | film production company, business | Berwyn | 1999 |
| Blizzard North | video game developer | San Mateo | 1993 |
| Block, Inc. | dot-com company, business, enterprise, public company | San Francisco | February 2009 |
| Blockbuster LLC | brand, business, enterprise | Dallas | 1985 |
| 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 |
| Blumhouse Productions | film production company | Los Angeles | 2000 |
| BMC Software | business, enterprise | Houston | 1980 |
| BMG Rights Management | military division, record label, music publisher, business | Quartier 205 | October 1, 2008 |
| Bob Jones University | private for-profit educational institution, seminary | — | 1927 |
| Boeing | rail vehicle manufacturer, public company, aerospace manufacturer | Chicago | 1934 |
| Boeing Rotorcraft Systems | aerospace manufacturer | United States | 1960 |
| Bohemian Club | gentlemen's club, private press, club | San Francisco | April 1872 |
| Boise State University | public educational institution of the United States, university | — | 1932 |
| Bojangles' Famous Chicken 'n Biscuits | fast food restaurant chain, public company | Charlotte | 1977 |
| Bongo Comics Group | book publisher, business | Santa Monica | 1993 |
| Booking Holdings | business, enterprise, public company | Norwalk | July 1997 |
| Booth School of Business | business school | — | 1898 |
| Booz Allen Hamilton | business, public company | Tysons | 1914 |
| BorgWarner | business, enterprise, public company | Auburn Hills | 1880 |
| Boston Athenæum | nonprofit organization, art museum, rare book library, library | Boston | 1850 |
| Boston Beer Company | brewery, public company | Boston | 1985 |
| Boston Dynamics | business | Waltham | November 6, 1992 |
| Boston Latin School | magnet school | — | April 23, 1635 |
| Bowling Green State University | public educational institution of the United States, open-access publisher, public university | — | 1910 |
| Box | website, business, enterprise, public company | Redwood City | May 2009 |
| Bradley University | private not-for-profit educational institution, private university | — | 1897 |
| Branded Entertainment Network | photo library, advertising agency, photo agency | Seattle, Los Angeles | 1989 |
| Brandywine Productions | film production company | United States | 1960 |
| Braniff International Airways | airline | Dallas, Oklahoma City | 1928 |
| Brewster Aeronautical Corporation | aerospace manufacturer | — | 1932 |
| Brigham Young University–Hawaii | private not-for-profit educational institution, university | — | 1955 |
| Brigham Young University–Idaho | private not-for-profit educational institution, university | Rexburg | — |
| Broadcast Music, Inc. | copyright collective, performing rights organization, business, company | Manhattan | 1939 |
| Broadcom | business, enterprise | Irvine | August 1991 |
| Brocade Communications Systems | business, subsidiary company, enterprise, public company | San Jose | 1995 |
| Brooklyn College | college, public educational institution of the United States | Brooklyn | 1930 |
| Brooklyn Public Library | library network, public library | — | 1896 |
| Brown & Williamson | business, enterprise | Louisville | 1894 |
| Brown-Forman | organization, business, public company | Louisville | 1870 |
| Brushfire Records | record label, record company | Los Angeles | 2002 |
| Bucyrus International | business, enterprise, public company | South Milwaukee | 1880 |
| Budd Company | business, aerospace manufacturer | Philadelphia | 1912 |
| 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 |
| Bureau of Engraving and Printing | building of public administration, United States federal agency, printing company | Washington, D.C. | August 29, 1862 |
| Burger Chef | business | Indianapolis | 1954 |
| Burlington | business, public company | Florence | 1972 |
| Burlington Northern Railroad | railway company | Fort Worth, Saint Paul, Seattle | March 2, 1970 |
| Burt's Bees | business, subsidiary company | Durham | 1984 |
| Burton Snowboards | business | Burlington | 1977 |
| Butler University | private not-for-profit educational institution, private university | — | 1855 |