Table of contents
How we vet every listicle
Every agency featured on Web Tonic passes our 84-point editorial review before a single listicle goes live. This is how we vet each pick:
Verified client outcomes: We require real case studies with measurable KPIs — revenue, ROAS, CPA, retention — tied to the exact category being ranked. No cherry-picked wins, no unverifiable numbers.
Independent reputation: We cross-check Clutch, Google, G2, and Trustpilot ratings, and screen for review-bombing or suspicious patterns. Only operators with a consistent, verifiable track record make the cut.
Beyond that, every listing goes through a quarterly re-audit. We check 84 criteria across 6 pillars to make sure it still holds up — here are some of the checks we run:
An Amazon advertising agency runs the paid and organic side of a brand's marketplace account together: Sponsored Products, Brands and Display bids inside the ad console, the titles, images and A+ content that decide whether a click converts, and the reporting that reads spend against total sales rather than ad sales alone.
Marketplace badges and directory placements counted for nothing. We kept only firms whose own site sells Amazon advertising or marketplace management as a named service, read the address behind the Los Angeles claim, and used each firm's own logo. Ten external firms survived that pass, ten show marketplace work on their own site, and none publishes a rate card.
What does an Amazon advertising agency in Los Angeles actually deliver?
Profitable marketplace sales, not a lower ACoS in isolation. The agency owns bids, listing content, creative and the read on total sales. Ten external firms selling into Los Angeles cleared our check, three publish a local address, and two credit a client by name.
1. Web Tonic
About: Web Tonic treats the marketplace as one account, so the demand plan, the listing and ad creative built for it and the reporting that reads total sales, not just ad sales answer to one team. Ad consoles, Seller Central access and creative files stay in the brand’s name from the first week.
Key Services: Growth Marketing, Paid Social, PPC, Meta Ads, SEO, Google Ads, Snapchat Ads, Amazon Ads, Reddit Ads, TikTok Ads, TikTok Shop, GEO-AEO, Webflow Design, Shopify Design, WordPress Design, UGC, Social Media Management, Pay Per Click Management, Marketing Analytics, Analytics Implementation & CDPs, Performance Branding, Performance 360° Audit, Programmatic Ads, OOH Ads, HR Marketing
Industries Served: eCommerce, SaaS, B2B, Construction Professionals, Home Services, SMEs, Health Spa & Wellness, Retail, Legal & Judicial Services, Food & Beverages, Pets, Fitness, Family & Children, Finance & Insurance, Travel, Non-Profits & Organizations, Furniture & Decoration
Notable Clients: WorldRemit, Jack & Jones, Ardene, L’Oréal, Sendwave, Nestlé, Airbnb. Serve Fortune 500 companies and smaller fast-paced startups.
Locations: HQ in San Francisco with notable offices in New York, Chicago, Miami, Toronto, Montreal, Dubai, Singapore, Sydney and more. Offices on five continents.
Pricing: Starting at USD $3,000 per month. Flexible and scalable plans at any time according to your enterprise needs. Book a call to learn more.
Great For: Mid-market to enterprise-level businesses requiring ongoing, on-tap growth and performance marketing services.
Website: Web Tonic
2. Amazon Growth Lab
About: Amazon Growth Lab is a full-service Amazon marketing and marketplace management agency specializing in PPC advertising, SEO listing optimization, and comprehensive account growth strategies. The agency leverages data-driven frameworks and proprietary tech stacks to scale consumer brands on Amazon.
Key Services: Amazon PPC Management, Amazon Listing Optimization, Amazon DSP Services, Full Account Management, Amazon Creatives & Storefront Design, Revenue Recovery & Inventory Management
Industries Served: Ecommerce, Consumer Brands, Retail
Notable Clients: Ray-Ban, Reebok, Anker, Skechers
Locations: Culver City, CA
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Amazon Growth Lab
3. Trivium Group
About: Trivium Group is a full-service Amazon agency that helps brands scale profitably through a profit-first mindset and data-driven strategies. They provide a suite of services including paid search advertising, DSP campaigns, creative design, and complete marketplace account management.
Key Services: Amazon PPC Management, Full Account Management, DSP Management, Creative Optimization, SEO Optimization, TikTok Shop
Industries Served: CPG, Health & Wellness, Supplement Brands, Home & Electronics, Personal Care
Notable Clients: Real Mushrooms, Tenzo, Neuro Gum, Labrada
Locations: Los Angeles, CA
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Trivium Group
4. Thrive Internet Marketing Agency
About: Thrive Internet Marketing Agency is a full-service digital marketing agency that provides comprehensive marketplace management and advertising services across platforms like Amazon. Their offerings cover Amazon SEO, paid search advertising, storefront design, and inventory scaling solutions.
Key Services: Amazon SEO, Amazon Advertising/PPC, Amazon Storefront & Branding, Amazon Seller Consulting, Amazon Posts Management, Amazon DSP Advertising Management, eCommerce Marketplace Marketing, Marketplace Strategy Development
Industries Served: eCommerce, Retail, Manufacturing
Notable Clients:
Locations: Arlington, TX
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Thrive Internet Marketing Agency
5. SmartSites
About: SmartSites is a digital marketing agency offering robust Amazon advertising and marketplace management services, including Sponsored Products and Store setup. As an Amazon Ads Verified Partner, the agency helps clients optimize product listings and lower their ACoS to maximize marketplace sales.
Key Services: Amazon PPC Management, Amazon Marketplace Management, Amazon Storefront Design, Product Listing Optimization, Pay-Per-Click Advertising, Search Engine Optimization
Industries Served: Ecommerce
Notable Clients:
Locations: Paramus, New Jersey
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: SmartSites
6. 405 Ads SEO Los Angeles
About: 405 Ads is a full-service digital marketing and paid media agency headquartered in Los Angeles, California. They specialize in multi-channel performance campaigns including Amazon advertising, ecommerce growth, SEO, and web development to help businesses scale online revenue.
Key Services: Amazon Ads, Amazon DSP, PPC Management, Google Ads Management, Meta Ads Management, SEO, Ecommerce Growth, Web Design and Development
Industries Served: Ecommerce, Law Firms, Healthcare, Tech
Notable Clients:
Locations: Los Angeles
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: 405 Ads SEO Los Angeles
7. Listing Kings
About: Listing Kings is a full-service Amazon agency specializing in growing brands and maximizing sales through performance-based strategies. Their marketplace experts provide services ranging from generating brand content and listing optimization to building Pay-Per-Click campaigns.
Key Services: Search Engine Optimization, Listing Optimization, Photography, Design, Advertising, Trademark Registration, Reimbursements, Suspensions
Industries Served: eCommerce, Retail
Notable Clients:
Locations: Carson, CA
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Listing Kings
8. Eclipse Marketing
About: Eclipse Marketing is a digital marketing agency providing services such as Amazon SEO, Amazon paid advertising, and search engine optimization. Their official corporate registration and primary operations are based out of Denver, Colorado, while maintaining digital marketing campaigns across various competitive markets.
Key Services: Amazon SEO, Amazon Paid Advertising, Search Engine Optimization (SEO), Google Ads, Web Design
Industries Served: Ecommerce, Real Estate, Healthcare, Home Services
Notable Clients:
Locations: Denver
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Eclipse Marketing
9. SalesDuo, Inc
About: SalesDuo is a full-service Amazon and ecommerce agency that combines an expert team with a proprietary AI system to manage marketplace operations, advertising, and growth. They support multi-channel scaling across platforms including Amazon, Walmart, and TikTok Shop.
Key Services: Amazon Advertising, PPC & DSP Management, Amazon SEO & Listing Optimization, Marketplace Management, Vendor Central & Seller Central Management, Inventory Forecasting & FBA Management
Industries Served: Ecommerce, D2C, Retail
Notable Clients:
Locations: New York
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: SalesDuo, Inc
10. Seller Interactive
About: Seller Interactive is a marketing and full account management agency that specializes in helping brands scale on the Amazon marketplace. They provide core services such as pay-per-click advertising, listing optimizations, A+ content, and account health support.
Key Services: Amazon PPC Management, Full Account Management, Listing Optimization, A+ Content Creation, Brand Protection & Account Health Support
Industries Served: E-commerce, Consumer Packaged Goods
Notable Clients:
Locations: Markham
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Seller Interactive
11. Evantage
About: Evantage is an Amazon store management and consultancy provider offering marketplace setup, listing optimization, PPC advertising, and back-end support. Operating under Hvantage Technologies Inc., the company provides tailored e-commerce solutions for online retailers and manufacturers worldwide.
Key Services: Amazon Consultancy, Amazon Listing Optimization, Amazon EBC, Amazon Marketing Services, Amazon PPC, Amazon Support, Catalog Management, Customer Interaction Services
Industries Served: Ecommerce
Notable Clients:
Locations: Los Angeles, CA
Pricing: Quote-based
Great For: Brands selling on Amazon
Website: Evantage
Quick Comparison Table
| Agency | Key Specialty | Starting Price | Best For |
|---|---|---|---|
| 1. Web Tonic | Full-Service Performance Marketing | USD $3,000/mo | Mid-market to Enterprise |
| 2. Amazon Growth Lab | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 3. Trivium Group | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 4. Thrive Internet Marketing Agency | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 5. SmartSites | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 6. 405 Ads SEO Los Angeles | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 7. Listing Kings | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 8. Eclipse Marketing | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 9. SalesDuo, Inc | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 10. Seller Interactive | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
| 11. Evantage | Amazon advertising and marketplace management | Quote-based | Brands selling on Amazon |
Frequently Asked Questions
What does an Amazon advertising agency do that a general Los Angeles agency does not?
It works inside a closed retail system. Bids sit next to inventory, buy-box status, review velocity and listing content, so a campaign can fail for reasons that have nothing to do with the ad: a suppressed image, a stock-out, a lost buy box. A generalist optimises the click; a marketplace team optimises the click, the detail page and the supply behind it.
Is ACoS the number to judge them on?
Only alongside total sales. ACoS measures ad spend against ad-attributed revenue, so it can improve while the account shrinks, simply by switching off the campaigns that recruit new buyers. Ask for TACoS, total sales and new-to-brand orders in one view, and ask what the agency would do if TACoS rose during a deliberate launch.
Which of these firms can I verify before a call?
Two of the ten. Amazon Growth Lab names Ray-Ban and Reebok, and Trivium Group names Real Mushrooms and Tenzo. The rest name nobody publicly, which is usually a marketplace confidentiality clause rather than evasion. Move the burden to the call: ask for one brand in your category, the starting and finishing TACoS, and what they would cut first if the ad budget halved.
Why did two quotes for the same catalogue differ so much?
Because the word management covers different work. Ask whether listing copy, photography and A+ content are included or billed separately, who handles cases, reimbursements and suppressions, whether Amazon DSP and Walmart are inside the fee, and whether the percentage is charged on ad spend or total revenue. Those answers usually rebuild the entire gap.
Does the agency need to be based in Los Angeles?
Rarely, because the marketplace auction is read from the shopper's location and the work happens in Seller Central. Local presence helps when someone must handle photography, samples or warehouse logistics in person. Three of the ten publish a Los Angeles address and the others sell into the market from elsewhere: Amazon Growth Lab (Culver City, CA), Thrive Internet Marketing Agency (Arlington, TX) and SmartSites (Paramus, NJ) and 4 more. Judge the reporting and the named account contact before the postcode.
Choosing an Amazon Advertising Partner in Los Angeles
Three of the ten external firms here publish a Los Angeles address, so geography will not shorten this list for you. What separates them is whether the account is reported as total sales and new-to-brand orders or as a tidy ACoS on a shrinking catalogue.
Two credit a brand you can check, and not one publishes a fee, so every figure on this page is quoted against scope. Settle ad spend, listing content and who owns creative files before you compare two proposals.
The clearest signal of a serious partner is a plan that survives a stock-out. Ask what happens to bids when inventory runs thin, who files the case when a listing is suppressed, and which single figure they would move first in a flat quarter.
Whichever way the brief lands, keep bids, listing content and reporting answerable to one owner, because a falling ACoS beside falling revenue mostly proves the ads were switched off. If you would rather have the demand plan, the paid search around the listing and the reporting that reads total sales owned by one team, read our latest analysis or see how we work in Los Angeles.
