Pay-per-click management covers campaign strategy, keyword, and audience targeting, bid management, ad creative, landing page testing, and performance reporting. Most pay-per-click services are billed either as a monthly retainer or as a percentage of ad spend, with minimum budgets on this list starting under $1,000 and hourly rates ranging from $10 to $235. The pay-per-click management companies below are ranked by verified client reviews across Google, Microsoft, Meta, and Amazon. Searching specifically for PPC agencies in the US? Start there instead.

List of the Best Pay Per Click Management Agencies

9,569 Companies-Rankings updated: November 05, 2026

Organic rankings are determined by five factors: top services, reviews, portfolio, awards/press, and team expertise. Sponsored listings pay for a placement that appears above organic positions. Sponsorship does not affect star ratings or review content - read more on our methodology page.

  • Only SEO Agency In Omaha that Guarantee Results

    Our proven SEO services deliver measurable results, whether you want to dominate local searches or expand your reach nationally...

    Top Services:

    • SEO
    • PPC
    Location
    Omaha, Nebraska
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • Data-Driven Strategies for Real Growth.

    The Uproot Agency is a results-driven digital marketing agency focused on helping businesses grow through data-driven strategies and creative solutions. With expertise in SEO, web design, social media marketing, and PPC advertising, they deliver customized plans that drive measurable business results...

    Top Services:

    • SEO
    • PPC
    Location
    Cibolo, Texas
    Number of Employees
    Under 49
    Average Hourly Rate
    $99/hr
    Minimal Budget
    $1,000 - $10,000
  • Unlocking Audiences Others Cant Reach

    Jaywood Agency is an independent digital marketing and content agency specializing in connecting brands with complex and hard-to-reach audiences. They design, implement, and manage marketing campaigns that deliver results across SEO, paid ads, social media, and more...

    Top Services:

    • SEO
    • PPC
    Location
    Huddersfield, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $99/hr
    Minimal Budget
    $1,000 - $10,000
  • Driving B2B Growth with Precision.

    ClickRoads is a high-performance B2B digital marketing agency specializing in tech businesses. With industry expertise and tailored strategies, they optimize customer journeys to boost conversions and close more deals...

    Top Services:

    • CRO
    • PPC
    Location
    Warsaw, Poland
    Number of Employees
    Under 49
    Average Hourly Rate
    $49/hr
    Minimal Budget
    $1,000 - $10,000
  • Exploring New Peaks, Together.

    Transylvania Marketing specializes in Performance Marketing, offering customized and innovative solutions to help businesses optimize their eCommerce platforms and achieve measurable success...

    Top Services:

    • CRO
    • PPC
    Location
    Bucharest, Romania
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • Paid Media That Works.

    Hop2TheTop specializes in data-driven paid search and social advertising, delivering hyper-targeted campaigns, optimized budget management, and actionable insights for measurable results...

    Top Services:

    • CRO
    • PPC
    Location
    Fort Lauderdale, Florida
    Number of Employees
    Under 49
    Average Hourly Rate
    $149/hr
    Minimal Budget
    $1,000 - $10,000
  • Empowering Ideas, Driving Momentum

    Digital On Demand is a forward-thinking digital agency dedicated to advancing the science of influence. By combining innovative strategies, cutting-edge technology, and creative expertise, they build marketing momentum that drives meaningful impact...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    London, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $99/hr
    Minimal Budget
    $1,000 - $10,000
  • Bite your ideas !

    FOOD AD Marketing is a results-driven marketing agency dedicated to increasing your online visibility and maximizing your return on investment. We specialize in Google Ads, helping businesses create and optimize high-performing campaigns that drive traffic, generate leads, and boost conversions...

    Top Services:

    • Branding
    • PPC
    Location
    Geneva, Switzerland
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
  • THE GO-TO Digital Marketing Agency For Contractors.

    Generate Leads, Drive Sales, and Achieve Business Growth with a Digital Marketing Agency for Contractors. We specialize in contractor digital marketing services that connect you with your target audience, enhance your online presence, and grow your business. Start transforming your contractor business today...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Newmarket, Canada
    Number of Employees
    Under 49
  • SEO, Google Ads and Social Media Experts since 1999.

    DevaGroup company has been operating in this sector since 1999. They have hundreds of satisfied clients, excellent reviews and numerous achievements and prizes.DevaGroups means full specialization, one of the top companies in Poland. Learn why you should trust them!...

    Top Services:

    • SEO
    • PPC
    Location
    Krakow, Poland
    Number of Employees
    Under 49
    Average Hourly Rate
    $49/hr
    Minimal Budget
    $1,000 - $10,000
  • Advertising & Brand Management Services.

    For about 3 decades, Wetherheads Advertising Group Limited has been at the forefront of providing marketing communication solutions to various clients in the private and public sectors. Their consumer-centric approach makes them understand client’s needs. They drive exponential growth by leveraging on our...

    Top Services:

    • Advertising
    • PPC
    Location
    Lagos, Nigeria
    Number of Employees
    100 - 249
  • We're the most sought after SEO Specialists in Bristol and Beyond!

    BrisTechTonic is a Bristol-based SEO company who offer a personalised approach to search engine optimisation. Unlike traditional SEO agencies, we provide tailored services designed to help small businesses enhance their online presence and achieve higher rankings on search engines. We might be local. But we...

    Top Services:

    • SEO
    • PPC
    Location
    Bristol, United Kingdom
    Number of Employees
    Under 49
    Minimal Budget
    Under $1,000
  • Our Solutions. Your Traffic.

    Join our SEO experts on the next stage of the SEO evolution and take your website optimization to a new level...

    Top Services:

    • SEO
    • PPC
    Location
    Munich, Germany
    Number of Employees
    Under 49
    Average Hourly Rate
    $110/hr
    Minimal Budget
    $1,000 - $10,000
  • We help businesses strategically boost their site traffic with SEO.

    With over 10 years of experience in digital marketing, our team at the Digital Hub specializes in crafting tailored SEO strategies to boost your online visibility. We service businesses across Australia, including SEO in the Northern Beaches region. Our offerings include SEO consultations, SEO copywriting...

    Top Services:

    • SEO
    • PPC
    Location
    Sydney, Australia
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
  • That Bring You Real Clients, Not Just Clicks

    Google Ads Consultant Australia is a Sydney-based digital marketing agency specializing in pay-per-click (PPC) advertising. With a proven track record of over 100 successful campaigns and more than 4,000 leads generated, the agency focuses on helping local service-based businesses across Australia enhance...

    Top Services:

    • SEO
    • PPC
    Location
    Sydney, Australia
    Number of Employees
    Under 49
    Average Hourly Rate
    $75/hr
    Minimal Budget
    Under $1,000
  • Elevating Brands Through Expert Strategies

    Dataswans is a Bratislava-based digital agency specializing in data-driven brand strategy, marketing, and analytics. They help businesses transform complex data into actionable insights, creating tailored brand identities and marketing campaigns that drive measurable growth...

    Top Services:

    • Branding
    • PPC
    Location
    Bratislava, Slovakia
    Number of Employees
    Under 49
    Average Hourly Rate
    $90/hr
    Minimal Budget
    $50,000 & Up
  • Doubling Traffic In 180 Days

    Data-driven SEO agency that's been in the trenches since Panda & Penguin. We deliver real results - averaging 250% traffic growth in 6 months. Our proven process has helped 20 businesses from crypto exchanges to law firms dominate Google's first page...

    Top Services:

    • SEO
    • PPC
    Location
    Paphos, Cyprus
    Number of Employees
    Under 49
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $1,000 - $10,000
  • The Marketing Agency For Startups & Local Brands

    We leverages Paid Search, Paid Social, and SEO to create growth engines for startups and service-based businesses! We help startups and local businesses unlock growth through innovative search and social strategies...

    Top Services:

    • SEO
    • PPC
    Location
    Waxhaw, North Carolina
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
  • SEO Consultancy Company With Proven Results

    We specialize in Search Engine Optimization to help your company website rank higher on search engines such as Google and Bing. Helping businesses realize their potential through effective digital IT solution design and SEO services since 2011...

    Top Services:

    • SEO
    • PPC
    Location
    Kettering, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
  • Marketing That Drives Customers To Your Shop.

    Element is a niche digital marketing agency focused on helping auto and truck repair shops across the U.S. grow their business. Our team works with data-driven strategies to reduce cost per lead, increase ROI, and ensure long-term growth for repair shops of any size...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Sheridan, Wyoming
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
  • Best SEO For SME Companies

    SEO Kari Nieminen provides expert search engine optimization services for businesses aiming at higher Google rankings and long-term digital growth. The brand combines technical SEO, content marketing, and topical authority to deliver measurable results...

    Top Services:

    • SEO
    • PPC
    Location
    Salo, Finland
    Number of Employees
    Under 49
    Average Hourly Rate
    $60/hr
    Minimal Budget
    $1,000 - $10,000
  • The Complete Website System That Runs Your Farms Online Business

    HomeGrown Hosting is a full-service design and hosting agency serving small farms, offering custom farm-focused websites, local SEO, e-commerce setup (including subscription boxes and custom product options), and ongoing site management and marketing tools...

    Top Services:

    • Web Design
    • PPC
    Location
    Richmond, Virginia
    Number of Employees
    Under 49
  • Paid Ads, eCommerce & Ad Cloaking Experts

    Boost Ad Agency is a Facebook advertising agency that builds and scales data-driven paid media campaigns to help eCommerce brands and businesses drive conversions and maximize return on ad spend...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    London, United Kingdom
    Number of Employees
    Under 49
  • Maximising The Power Of Creators

    We are Disrupt, a global influencer marketing agency. We combine the science of audiences with the power of creators to deliver measurable digital success. Connect. Create. Convert. No fluff. No wasted moves. Just impact...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    London, United Kingdom
    Number of Employees
    50 - 99
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
  • Reach a Diverse, Young Audience Through Short-Form Video Content.

    outbloom is a paid social advertising agency and full-service paid-social partner that builds and optimizes Meta, TikTok, and multi-channel campaigns to help brands reach audiences, drive conversions and scale online...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Manchester, United Kingdom
    Number of Employees
    Under 49
  • Leading Independent Performance Digital Marketing Agency

    SOUP Agency is a paid advertising agency that delivers full-funnel social campaigns from creative content to TikTok ad management to drive leads, sales, and measurable growth...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Austin, Texas
    Number of Employees
    Under 49
  • An Award Winning Digital Marketing Agency

    Digital Heists is a TikTok advertising agency that builds and manages paid-social campaigns including TikTok, Facebook, and eCommerce ads to help brands expand reach, boost conversions, and grow online...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Milford Mill, Maryland
    Number of Employees
    Under 49
  • The Results Driven Digital Growth and Transformation Agency

    Core Optimisation is a TikTok advertising agency that runs data-driven paid-social campaigns across TikTok, Meta, LinkedIn, and more to help brands boost awareness, engagement, and conversions...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Shannon, Ireland
    Number of Employees
    100 - 249
  • Harnessing the Power of Paid Social Marketing To Drive Mass Awareness, Sales and Leads

    Hoopla Marketing is a TikTok advertising agency that builds and manages paid social campaigns on TikTok (and other platforms) to help brands reach new audiences, drive conversions, and scale growth...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Manchester, United Kingdom
    Number of Employees
    Under 49
  • TikTok Ads That Deliver

    BusinessUp! is a TikTok advertising agency that builds and manages performance-driven social campaigns to help brands grow awareness, traffic and sales globally...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Maidenhead, United Kingdom
    Number of Employees
    Under 49
  • Digital Marketing Agency London

    Disturb Digital is a digital marketing agency offering TikTok advertising, Facebook/Meta ads, Google Ads, web design, and full-funnel paidsocial campaigns to help brands scale and generate measurable results...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Harrow, United Kingdom
    Number of Employees
    Under 49
  • Done-for-You TikTok Services

    Walker Hill Digital is a digital marketing and TikTok advertising agency that builds and manages paid social campaigns, content creation, and full-funnel marketing to help brands scale and convert online...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Brisbane, Australia
    Number of Employees
    100 - 249
  • Your Sales Funnel Is Our Priority.

    Fill My Funnel is a LinkedIn ads agency that delivers tailored B2B ad campaigns and lead-generation strategies to help companies attract, engage, and convert professional audiences...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    London, United Kingdom
    Number of Employees
    Under 49
  • A Pay-Per-Lead Digital Marketing Agency For Ambitious Brands

    Flow20 is a LinkedIn ads and full-service digital marketing agency that builds and manages paid social and PPC campaigns to help businesses generate qualified leads and grow...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    London, United Kingdom
    Number of Employees
    Under 49
  • The happy performance agency

    Launch Online is the performance marketing agency for brands that dare to be different. Driven by data, powered by peoplewe deliver outstanding results through our End-to-End Performance Marketing approach, including Media, Content, Experimentation, and Data. We thrive on innovation, empowering our expert...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    Exeter, United Kingdom
    Number of Employees
    Under 49
  • Global creative agency for those who want to push boundaries.

    FOUNDED BY A BUSINESS OWNERS FOR BUSINESS OWNERS, OUR POSTGRADUATE AND YOUNG ENTREPRENEUR OF THE YEAR MARKETING EXPERTS HAVE BUILT MASSIVE ROI FOR BUSINESSES LIKE YOURS. CLIENTS IN OVER 100 COUNTRIES. MILLIONS OF FOLLOWERS ENGAGED. OUR EXPERT DIGITAL MARKETING AGENCY TAKES EVERY PROJECT WE WORK ON TO THE NEXT...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    Manchester, United Kingdom
    Number of Employees
    Under 49
  • High-Impact Digital Marketing Agency

    At Dgency, we implement strategic marketing solutions that deliver more customers, grow revenue, and future-proof your business...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    Dhaka, Bangladesh
    Number of Employees
    Under 49
  • We build marketing solutions to grow your business.

    We develop advertising, digital and creative marketing activations that support ambitious businesses. When campaign and channel performance counts, count on The Bank...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    Newcastle upon Tyne, United Kingdom
    Number of Employees
    Under 49
  • Creative Online Solutions (aka COSMarketing Agency) is a full-service online digital marketing company based in Orlando, FL. We proudly serve small businesses across the country. Each of our services are fully customizable to meet the needs of our clients big or small!...

    Top Services:

    • Social Media Marketing
    • PPC
    Location
    Winter Park, Florida
    Number of Employees
    Under 49
  • Helping Your Business Grow

    The agency crafts visually compelling display ad campaigns that capture attention and deliver conversions. It blends data-driven audience targeting with creative design to maximize ad performance...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Sydney, Australia
    Number of Employees
    Under 49
  • The Digital Performance Marketing Agency

    K2L Marketing delivers high-impact display advertising campaigns that combine standout creative with data-driven targeting. The agency crafts and deploys visuals designed to capture attention, drive traffic and convert helping brands grow with measurable results...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Manchester, United Kingdom
    Number of Employees
    Under 49
  • Rule Your Rankings, Grow Your Reach.

    SEO King Dave is a digital marketing and search engine optimization agency focused on helping small and medium-sized businesses achieve first-page visibility in search engine results. The agency offers tailored SEO strategies, content marketing, local search optimization, and additional digital services...

    Top Services:

    • SEO
    • PPC
    Location
    Fresno, California
    Number of Employees
    Under 49
  • Proven System Designed To Scale Modern Brands

    Digital Marketing Agency Specialising in UGC creation, Meta Ads, TikTok Ads, Google Ads & SEO. We have over 100 UGC creators in our network...

    Top Services:

    • Digital Marketing
    • PPC
    Location
    Cape Town, South Africa
    Number of Employees
    Under 49
    Minimal Budget
    Under $1,000
  • We Make Sure Your Brand Gets Found

    Marketing Signals is a global search marketing and AI-driven agency focused on helping brands get discovered in an increasingly complex digital landscape. With decades of experience and a strong presence across the UK and USA, the agency delivers high-impact strategies that go beyond traditional search...

    Top Services:

    • SEO
    • PPC
    Location
    Altrincham, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
  • Where ECOM Growth Accelerates

    10X Commerce Co. is an eCommerce growth agency that helps brands scale through data-driven marketing, conversion optimization, and performance strategies. The company focuses on supporting online stores with services such as paid advertising, funnel optimization, and revenue growth strategies tailored for...

    Top Services:

    • eCommerce Development
    • PPC
    Location
    Piscataway, New Jersey
    Number of Employees
    500 - 999
    Average Hourly Rate
    $8/hr
    Minimal Budget
    $1,000 - $10,000
  • The Ex-google Insider Your Competiton Wish They Had

    ScalixAI is a performance-driven digital marketing agency that specializes in Google Ads and AI-powered growth strategies for SaaS, AI-first, and tech-focused companies. Led by former Google experts, the agency helps brands scale through data-driven PPC campaigns, conversion optimization, and multi-platform...

    Top Services:

    • SEO
    • PPC
    Location
    Toronto, Canada
    Number of Employees
    Under 49
    Average Hourly Rate
    $21/hr
    Minimal Budget
    $10,000 - $25,000
  • Marketing and Advertising Agency

    One Day Agency is an full-funnel indepedent marketing agency...

    Top Services:

    • Digital Marketing
    • eCommerce
    • PPC
    • Advertising
    • Media Buying
    • Show more
    Location
    Manchester, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000

Why companies trust DesignRush

Every agency is independently vetted before it can be listed or ranked

1

Identity Check

We verify businesses and reviewer LinkedIn profiles for integrity.

Agencies vetted
131,219+
2

Portfolio Review

We review agency work, case studies, and results to confirm skill.

Applicants rejected
47%
3

Ongoing Audit

We monitor listings regularly; outdated agencies are removed.

Agencies verified
9,569

Some agencies pay for sponsored placement, clearly labeled and held to the same vetting standards.

See how rankings and monetization work.

FAQs About PPC Agencies

SEO vs PPC: Which Is right for your business?

FeaturePPC (Paid Ads)SEO (Organic)
SpeedFast (live in hours)Slow (3 to 12 months to rank)
CostPaid per click; each click costsHigh effort, "Free" clicks
TrustModerate (some users skip ads)High (users trust organic more)
LongevityTraffic stops when the budget endsAssets last for years
EffortBidding & creative testingContent creation & technical

In 2026, the debate isn't about which is better, but which is faster. With AI Overviews (AIO) now dominating the top of search results, both Search Engine Optimization (SEO) and Pay Per Click (PPC) have had to change. 

The short answer: PPC brings fast results; SEO builds momentum over time. 

Use SEO when you want long-term, compounding traffic and can afford to wait for results. Use PPC when you need immediate visibility, fast testing, or predictable demand on a controlled budget. 

For best results, combine both methods. 

What is the best PPC platform for my business?

 

If your goal is...Use this platform
Immediate sales or leadsGoogle Ads (Search)
Building a brand/lifestyleMeta (Instagram) or TikTok
Selling to other businessesLinkedIn Ads
Selling products on a budgetAmazon Ads or Microsoft Ads
Targeting Gen Z or trendsTikTok Ads

The best platform depends entirely on your business model and where your customers spend the most time. Since the rise of AI-integrated search, PPC has split into two worlds: intent-based (people looking for you) and interruption-based (you looking for them). 

Best for most businesses: 

  • Google Ads: Ideal for high-intent traffic. If someone types "emergency plumber Cheney" or "best CRM for startups," they want to buy now.  
  • Meta Ads (Facebook & Instagram): Best for visual products and impulse buys. If your product looks great in a video or photo, Meta's algorithm is elite at finding people who didn't know they wanted your product until they saw it. 

The specialist platforms: 

  • LinkedIn Ads: The gold standard for B2B. It is expensive (high CPC), but your B2B PPC agency can target by specific job titles (e.g., Director of Logistics) or company size. 
  • Amazon Ads: A must for physical product sellers. It often has a higher conversion rate than Google because users are already in shopping mode.
  • TikTok Ads: In 2026, TikTok is a massive search engine for Gen Z and Millennials. 

Alternatives: 

  • Microsoft advertising (Bing): Often overlooked, but it reaches a more affluent and older demographic (usually 45+). Competition is lower, so your cost-per-click (CPC) is often 30% cheaper than Google. 
  • Reddit & Quora: Best for niche, high-trust communities. If your audience is highly technical or research-heavy, appearing in these threads can feel more like a recommendation than an ad. 

How much does PPC agency management cost?

Your total PPC cost is ad spend plus management fees. Industry competition determines how high both numbers go. 

Average costs for a standard PPC campaign are: 

  • Ad spend: $500 to $20,000+ per month 
  • Cost-per-click (CPC): Approximately $1.62 per click 
  • Cost-per-1,000 impressions (CPM): Approximately $3.12 
  • Remarketing CPC: $0.66 to $1.23 per click 
  • Tools and software: $15 to $800 per month 

Agencies usually charge using one of these models: 

  • Percentage of ad spend: 12% to 30% of monthly spend 
  • Flat monthly fee: $1,000 to $3,000 for small to mid-sized businesses 
  • Project-based pricing: $1,000 to $10,000+ for audits, setup, or short engagements 

Average CPC in 2026 across major industries:

IndustryAverage CPCAverage CTR
Business Services$5.375.62%
Health & Fitness$4.716.88%
Education$4.396.21%
Animals & Pets$3.907.39%
Beauty & Personal Care$3.566.75%
Fashion & Jewelry$3.396.13%
Real Estate$2.109.20%
Restaurants & Food$2.188.68%
Travel$1.9210.16%

How long does it take to see the results of a PPC campaign?

You will see traffic in 24 hours, data in 2 weeks, and true profitability in about 3 months. 

PPC delivers results faster than SEO, but it's not instant. While your ads can appear within hours, profitable, stable results generally follow a three-stage timeline. 

  • Days 1 to 7: Ads go live and gain immediate traffic. The platform's AI tests audiences. Avoid changing settings, or you will reset the learning process. 
  • Weeks 2 to 4: You spot winning ads, block wasted search terms, and see early leads or sales. Cost Per Acquisition (CPA) may be high because you’re buying data to see which ads convert. 
  • Months 2 to 3: You have enough data to cut underperforming keywords and double down on profitable ones. Results stabilize, and you hit your target return on ad spend (ROAS). 

Who owns your ad accounts?

You should, but you might not. The legal and technical ownership of an ad account depends entirely on how it was set up and what is in your contract. 

If you set up the account using your business email and your credit card, you own it. You simply invite a PPC agency as a partner or manager. If you choose to finish the partnership, you maintain full control and can remove their access at any time. You keep all the historical data, the winning ad formulas, and the tracking pixels that have learned who your customers are. 

When a PPC agency manages campaigns under its own account, you don't retain ownership. If you part ways, you could lose valuable campaign data and have to start from scratch.