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LAST UPDATED: November 1, 2026

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Sioux Falls Tower & Communications

4300 North Northview Avenue | Sioux Falls- South Dakota- 57107 | 605-331-6972

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Revenue: $10 million - $50 million | Year Founded: 2015 | Firm Size: 100 - 250

Core Services: Crisis Communications

sipmainsurance.com

1700 Main Street | Escalon- California- 95320 | 209-838-7609

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Revenue: Est. $1 million | Year Founded: 2014 | Firm Size: 1 - 10

Core Services: Public Relations

SIPR

927 West Hillsdale Boulevard | San Mateo- California- 94403 | 650-274-1509

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Revenue: $5 million - $10 million | Year Founded: 2015 | Firm Size: 10 - 50

Core Services: Public Relations

Siquis

Via Galileo Galilei 18- c/o Worky Center- | San Giovanni La Punta- Sicilia | +39 095 899 7287

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Revenue: $3 million - $5 million | Year Founded: 2014 | Firm Size: 15+

Core Services: Brand Integration

SIR

| +1 804-358-8981

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Revenue: $250,000 - $1 million | Year Founded: 1964 | Firm Size: 10 - 49

Core Services:

Founded in 1964, SIR helps companies, governmental agencies, nonprofits, and even entire communities solve today’s problems and plan for tomorrow. SIR is a new kind of strategic management consultancy, one that’s designed and staffed to meet the needs of organizations today — strategic, seasoned, data-driven, nimble, creative, and results-oriented. We are a small band of curious minds eager to mak... View Profile

Sir Isaac

81 Washington Street- Suite 201- | Salem- Massachusetts- 9170 | +1 978-594-8023

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Revenue: $1 million - $5 million | Year Founded: 2015 | Firm Size: 10 - 50

Core Services: Public Relations

Sir Logo

410 N Main Street | Clovis- New Mexico- 88101 | 575-762-5700

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Revenue: $1 million - $5 million | Year Founded: 2016 | Firm Size: 10 - 50

Core Services: Brand Integration

Sir Marketing Communications

21 Hawkins Drive- | Northport- New York | +1 631-757-5665

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Revenue: $1 million - $3 million | Year Founded: 2013 | Firm Size: 20+

Core Services: Public Relations

Sir Speedy

136 Manetto Hill Rd | Plainview- New York- 11803-1310 | 516-935-4567

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Revenue: $1 million - $5 million | Year Founded: 2013 | Firm Size: 10 - 50

Core Services: Brand Integration

Sir Speedy

1025 West Nursery Road- Suite 100 | Linthicum Heights- Maryland- 21090 | 410-553-6300

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Revenue: Est. $1 million | Year Founded: 2016 | Firm Size: 1 - 10

Core Services: Public Relations

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