If you're looking for an app marketing company to promote and market your mobile application, there are several reputable agencies and firms that specialize in app marketing strategies. Keep in mind that the effectiveness of an app marketing company can vary based on your specific needs and budget. Here are some app marketing companies that were recognized for their expertise as of my last update in January 2022:

• App Annie Ascend: App Annie Ascend is known for its data-driven approach to app marketing and offers solutions for user acquisition, app store optimization (ASO), and app analytics.
• Gummicube: Gummicube specializes in app store optimization (ASO) services, helping your app achieve higher visibility and more downloads in app stores.
• The ASO Project: This agency focuses exclusively on ASO (App Store Optimization) and can help you improve your app's visibility on app stores like Apple's App Store and Google Play.
• MightySignal: MightySignal provides app intelligence and data to help you make informed decisions about your app marketing strategy.
• App Growth Network: App Growth Network offers a range of app marketing services, including user acquisition, app store optimization, and mobile marketing campaigns.