Head offices
| Photo | Company | Address | Headquarters size |
|---|---|---|---|
 | AramarkHeadquarters | 2400 Market Street, Philadelphia, Pennsylvania | — |
 | ComcastComcast Center (HQ) | 1701 John F Kennedy Blvd, Philadelphia, PA 19103 | ≈ 1,250,000 sq ft (116,129 m²) |
 | GlenmedeOne Liberty Place | 1650 Market Street, Philadelphia, PA | — |
Sizes are the companies’ own figures, as shown on each profile with the source. “—” means the company does not publish one.
Philadelphia in headquarters history
- 2025AkzoNobel · Two headquarters planned
Under the merger agreed with Axalta on November 18, 2025, the combined company is to have dual headquarters in Amsterdam and Philadelphia, a corporate seat in the Netherlands and a single NYSE listing.
- 2018Comcast · Comcast Technology Center opens
The tower opened in 2018 and became Philadelphia's tallest building; construction was completed in 2019, and the Four Seasons Hotel on its top floors opened in October 2019. Comcast owns the headquarters at One Comcast Center and the Technology Center.
- 2001BlackRock · Its own building in Wilmington
In the first quarter of 2001 BlackRock completed an 84,000 sq ft office building it owns in Wilmington, Delaware, for operations previously in leased space there and in Philadelphia.
- 1999BlackRock · 345 Park Avenue — about 65,000 sq ft
When it went public in 1999, BlackRock's principal executive offices were at 345 Park Avenue, where it occupied about 65,000 sq ft (≈ 6,039 m²), with more space in Philadelphia and Wilmington.
- 1994–2007Comcast · 1500 Market Street, Philadelphia
Comcast's annual reports from 1994 to 2007 list its principal executive offices at 1500 Market Street in Center City Philadelphia.
- 1983PNC Financial Services · PNC is born
After Pennsylvania allowed statewide banking, Pittsburgh National and Philadelphia's Provident National merged — at the time the largest bank merger in U.S. history — and took the shared initials of their holding companies: PNC.
- 1956Glenmede · Founded in Philadelphia
Glenmede was founded in Philadelphia in 1956 and has been headquartered there ever since.
- 1886Johnson & Johnson · The top floor of a former wallpaper factory
On a train from New York to Philadelphia, James Wood Johnson spotted a four-story red brick building with a “For Rent” sign beside the tracks in New Brunswick — the old Janeway & Carpender wallpaper factory. He rented the top floor, and J&J opened with 14 employees: eight women and six men.
- 1830GSK · Smith & Gilbert, Philadelphia
The Smith & Gilbert drug house opened in Philadelphia. It became Smith, Kline & Co. by 1870 and Smith, Kline & French in 1891 — the “SmithKline” in GSK.
Questions
Which big companies have their headquarters in Philadelphia?
On eciffo, 3 of the biggest companies have their head office in Philadelphia: Aramark, Comcast and Glenmede.
What is the biggest company headquarters in Philadelphia?
Of the head offices on eciffo, Comcast's Comcast Center (HQ) is the largest at ≈ 1,250,000 sq ft (116,129 m²), as reported by the company.