Simon, the U.S. mall operator, is forming a retail media network, MediaPost reported on August 28, 2026.

The headline — "Mall Operator Simon Forms A Retail Media Network" — confirms Simon Property Group's intent to enter a category already populated by Kroger Precision Marketing, Walmart Connect, Target Roundel, Amazon Advertising, and Albertsons Media Collective. The source discloses no executives, no launch date, and no pricing.

What did Simon announce?

The MediaPost item, dated August 28, 2026, confirms two facts only: Simon is building a retail media network, and the news reached the trade press that day. The source reviewed by Martech Beacon contains no executive quote, product name, partner roster, or revenue figure.

That thin disclosure is itself news. Retail media has consolidated rapidly as grocery, big-box, and e-commerce operators built owned-and-operated media businesses. A landlord-led RMN is a newer structure.

Why does this matter to martech?

Retail media networks package three assets: first-party shopper data captured at point of sale, in-store advertising inventory (digital screens, audio, Wi-Fi), and increasingly off-site programmatic inventory. Advertisers pay for closed-loop measurement — tying a paid impression to an in-store or online transaction.

Simon's formation adds a real-estate counterweight to retailer-led networks, and pulls a new data set into the martech stack.

What changes for practitioners?

Three immediate shifts for media planners and ad-ops teams:

• Media planning. Brand teams and agencies must scope Simon as a potential retail-media partner in 2027 budget cycles, even before pricing lands.
• Measurement. Closed-loop attribution across Simon's properties will require new vendor integrations once the platform opens for ad buys.
• Competitive pressure. Existing U.S. RMNs each publish distinct rate cards, onboarding documentation, and measurement methodologies. Adding a sixth major network increases RFP volume for agencies and demands parallel integration work for ad-tech vendors.

Brands that already buy Kroger, Walmart, or Target media now face another U.S. option. Agencies planning retail-media budgets must scope Simon alongside incumbent networks, depending on category.

What the source does not disclose

Martech Beacon flags the following as open questions, none answered in the MediaPost headline or related material reviewed:

1. Platform name and go-to-market brand
2. Onboarding timeline for advertisers and agencies
3. Self-serve DSP access versus managed-service only
4. Off-site programmatic distribution partners
5. Data clean room technology (LiveRamp, Snowflake, Habu, or custom)
6. Measurement certifications (MRC, IAB)

What to watch

Practitioners should track the following signals over the next 60-90 days:

• A named platform or subsidiary brand from Simon
• Pricing tiers and minimum commitments
• Sales-team headcount and named leadership
• Advertiser pilot programs or launch partners
• Industry-venue appearances (Advertising Week, NRF, Cannes Lions)

Bottom line

Simon Property Group's retail media network formation lands on August 28, 2026, with operational details still undisclosed. The category gains another large-scale competitor; the martech stack gains another integration target once the platform opens to ad buys.