Ecommerce Marketing Agency: Acquisition, Conversion and Retention for Online Stores

Updated September 2026 · Written and maintained by the Progression Agency strategy team

An ecommerce marketing agency runs the channels that grow an online store profitably: paid search and shopping, paid social, SEO, email and SMS, marketplace and conversion work, measured by contribution margin rather than revenue alone. Progression Agency is an ecommerce marketing agency in New York working with stores across the United States and worldwide. This page explains what the work covers, how it differs by store type and stage, how channels fit together, what an ecommerce marketing company should report, and what it costs.

What ecommerce marketing covers

The store’s marketing is every point from the first ad or search result to the third order. Acquisition brings people who have never bought; conversion turns visits into orders; retention turns first orders into repeat customers and subscriptions. The work spans paid, organic, email, marketplace and site optimization, and it has to be run as one plan because each part changes the arithmetic of the others. Our Shopify ecommerce agency page covers the platform work; ecommerce website design covers the build.

Stores search for an ecommerce marketing agency in the USA, the best ecommerce marketing agency, an ecommerce marketing agency near me, ecommerce marketing, an ecommerce SEO agency, an ecommerce PPC agency, an ecommerce email marketing agency, a Shopify marketing agency, a DTC marketing agency, online store marketing, ecommerce growth, ecommerce CRO and contribution margin. One engagement covers all of them.

Ecommerce marketing by store type and stage

Acquisition: paid search, shopping and paid social

Shopping and search ads capture demand for products people already want; paid social creates demand for products they have not seen. Both are run by product margin, with feeds, catalog ads, creative testing and audiences structured so that budget follows contribution rather than revenue. Our Shopify PPC page and Facebook ads page cover the mechanics.

Ecommerce SEO: category, product and content

Organic search lowers blended acquisition cost over time. Category pages that rank for the terms buyers use, product pages with unique copy and structured data, faceted navigation under control, and content for research queries are the work. Our ecommerce SEO services page sets out the method and the order.

Conversion: product pages, speed, checkout and offers

Conversion work is the cheapest growth most stores have: product page content and images, reviews and social proof, size and fit guidance, shipping and return clarity, site speed, checkout friction and offer structure. Tests are run with defined read dates and decision rules, and winners become the baseline. Our growth marketing page explains the testing loop.

Retention: email, SMS, loyalty and subscription

Repeat customers are where ecommerce margin lives. Welcome, browse and cart recovery, post-purchase, replenishment, win-back and VIP flows, campaign calendars, SMS for launches, loyalty and subscription programs produce a large share of revenue for scaled stores. Our email marketing page covers the method.

Marketplaces alongside the store

Amazon and other marketplaces capture demand that would otherwise be lost, at the cost of margin and customer data. The plan decides which products go where, keeps listings and reviews strong, and uses brand campaigns to lift both the store and the marketplace.

Measurement: contribution margin and cohorts

Return on ad spend flatters channels that sell to existing customers and hides returns and discounts. We measure contribution margin after returns, new versus returning customers by channel, repeat rate and lifetime value by cohort, and we build the tracking in the store’s own analytics so it survives a change of agency.

What an ecommerce marketing company delivers each month

1. Paid search, shopping and paid social management by product margin.
2. Ecommerce SEO work on categories, products and content.
3. Conversion tests with read dates and decisions.
4. Email and SMS flows and campaigns.
5. Marketplace listing and advertising coordination.
6. Creative production planning.
7. Reporting: contribution margin, new and returning customers, repeat rate by channel.

How to choose an ecommerce marketing agency

• Ask how they measure after returns and discounts.
• Ask whether they run conversion and retention work, not only ads.
• Ask how budget is allocated by product margin.
• Ask what they report by cohort.
• Ask who owns the ad accounts, email platform and data. The store must.

What it costs: ecommerce marketing

Marketing retainers are priced by the channels and the hours behind them, not by the size of the client. For ecommerce marketing, the planning ranges below are the ones we quote against; they come from our published marketing agency pricing guide, and the final number follows a written scope.

Every figure above is a planning range already published on this site; the quote for ecommerce marketing follows a written scope, and the same ranges apply across the United States and worldwide.

Related services and guides

Pages on this site that sit next to ecommerce marketing and that a buyer usually reads alongside it.

• Shopify ecommerce agency
• Ecommerce SEO services
• Shopify PPC agency
• Facebook ads agency
• Email marketing
• Ecommerce website design
• Growth marketing agency

Frequently asked questions