Posessive forms of organizational names
The possessive form of a personal or organizational name that ends with an abbreviation, a number, a prepositional phrase, or a mark of punctuation, is made by adding an apostrophe plus s at the end of the complete name.
the Bank of America's 15-year loan rates
Mercy Hospital's foundation
the Knights of Columbus's fundraising drive
City of Hope's children's center
John Jones, Jr.'s contribution
NOTE: If no extra s sound is created when you pronounce the possessive form, add only an apostrophe.
the John Jones Jrs.' platinum sponsor plaque
Always defer to the organization's preference, when known.
Boys' Clubs of America
Diners Club
Cliffs Notes
Dr. Martens shoes
Mrs. Paul's frozen foods
The names of many organizations, products and publications contain words that can be considered either possessive or descriptive terms.
As a rule, use an apostrophe if the term is a singular possessive noun or an irregular plural noun.
Children's Hospital Los Angeles
M&M's candy
St. Joseph's aspirin
Elmer's glue
Levi's jeans
Women's Birthing Center
Do not use an apostrophe if the term is a regular plural that does not imply ownership or possession.
Chemical Workers Union
US Department of Veterans Affairs
Government Employees Insurance Company
Wiki