Retail Media Consolidation 2026: the mergers, platform switches and what they mean for tier-2 retailers

Dates are announcement dates unless the row says completed. "Pending" means the deal had not closed when this page was last updated.

Networks. Delivery apps are buying reach. DoorDash added Deliveroo in 2025 and now wants Instacart. Grocers are buying too: Kroger's Giant Eagle deal would bring Leap Media Group under the owner of Kroger Precision Marketing. The largest grocery merger failed. Supermarket News noted in 2023 that a Kroger and Albertsons combination could have created a large retail media player (Supermarket News, June 2023), but the deal ended in December 2024.

Ad tech and data. This layer moved the most. Retailers that scale tend to leave vendors: Lowe's left CitrusAd and Kroger left PromoteIQ in 2023, and Microsoft then closed PromoteIQ. Meanwhile, agency groups bought data infrastructure. WPP owns InfoSum. Publicis owns Epsilon, which includes CitrusAd, and now LiveRamp, and it co-owns Unlimitail with Carrefour (PPC Land, 6 April 2026). Amazon, the largest network, now rents its engine to other retailers.

Screens and CTV. Owning the screen is the third play. Walmart owns a TV maker and a CTV buying platform. Fox completed its purchase of Roku on 6 November 2026. In stores, signage vendors are changing hands after Stratacache's troubles, which invidis describes as financial challenges (invidis, 18 August 2026).

The table shows a pattern. The two largest networks now own all three layers: the network, the buying technology and the screens. DoorDash is assembling the same stack in delivery. The agency groups own data and identity layers but no screens. A second-tier retailer usually owns only its network and its shopper data, and rents everything else from one of these groups. That is why vendor ownership now belongs in a retailer's risk register, next to payment processors and cloud providers.

Sources for each cell are in the timeline above and the linked profiles. The Lotame purchase is reported by PPC Land, 2 November 2026.

A second-tier retailer here means any network outside Amazon and Walmart, often running on ad tech rented from a vendor. Six consequences follow from the timeline.

1. Your vendor may join a competitor. Instacart's Carrot Ads runs retail media for other grocers, and DoorDash says the merger could let more grocers run their own networks on Instacart's technology (DoorDash, 29 October 2026). That is a company claim. Grocers using Carrot Ads should still read their change-of-control terms now.
2. Renting from a rival is now normal. Best Buy chose Amazon's programmatic technology over building its own (Best Buy, 23 September 2026). The trade is speed against control of pricing logic and data.
3. Neutral data layers may have an agency owner. The FTC's proposed order requires LiveRamp to stay commercially neutral and bars Publicis from using customer data without authorisation (PPC Land, 2 November 2026). Retailers that work with rival agencies may still want their own contract terms.
4. Vendors exit. PromoteIQ closed, and Instacart is ending its Caper carts business by the end of Q2 2027 (Grocery Dive, 27 October 2026). Every platform contract needs an exit plan and a data return clause.
5. Shared networks are a real option. Unlimitail says Coopérative U will bring its network to 40 partners and nearly 35% of the French grocery market (company claim) (Unlimitail, October 2026). Joining trades brand control for reach buyers already plan around.
6. Differentiation decides survival. With 14.5% of US spend outside Amazon and Walmart (The Desk, 19 August 2026), a tier-2 network needs a reason to be on the plan. Data no one else has, a niche audience or store reach are the usual answers.

The build, rent or join decision is worked through in when not to build a retail media network, and vendor capabilities are compared in retail media network platforms compared.

Most headlines blur three stages. An agreement is signed but can fail, as Kroger and Albertsons showed. A completion means ownership changed. A migration is when customers actually move, often months later. Walmart's Vibe.co deal took six weeks from agreement to completion. DoorDash expects Instacart to take more than a year, because it needs shareholder and antitrust approval in the US, Canada and Israel (DoorDash, 29 October 2026). Forward dates for 2027 are tracked in retail media trends 2027.

The timeline has five open items. Each has a date or a condition that will settle it.

• DoorDash and Instacart. The deal needs an Instacart shareholder vote and clearance under the Hart-Scott-Rodino Act, plus approvals in Canada and Israel. Holders of about 19% of Instacart's shares have agreed to vote in favour (DoorDash, 29 October 2026). Until closing, the two networks compete for the same grocery budgets.
• Kroger and Giant Eagle. Closing is expected in 2027 (P2PI, 1 July 2026). Brands that buy Leap Media Group today should ask how campaigns and data will move once Kroger owns it.
• Best Buy on Amazon technology. The switch starts in February 2027 (Best Buy, 23 September 2026). Watch whether other specialty retailers follow Asda and Best Buy onto Amazon's tools.
• Coopérative U joins Unlimitail. Sales begin in January 2027 (Unlimitail, October 2026). It will test whether a shared network can win budgets that single grocers could not.
• LiveRamp under Publicis. The FTC's consent order was proposed on 19 October 2026, and its final status should be checked at each review (PPC Land, 2 November 2026).

We update this page monthly. Each change is logged in the changelog below with its date and source.

1. DoorDash, "DoorDash to Acquire Instacart" (29 October 2026). https://about.doordash.com/en-us/news/doordash-to-acquire-instacart
2. Publicis Groupe, "Publicis Groupe Completes LiveRamp Acquisition" (November 2026). https://www.publicisgroupe.com/en/news/press-releases/publicis-groupe-completes-liveramp-acquisition-launches-the-industry-s-first-plug-and-play-ai-growth-engine-that-clients-fully-own-and-control
3. PPC Land, "Publicis now owns LiveRamp, the identity hub its rivals use, under an FTC order to keep it neutral" (2 November 2026). https://ppc.land/publicis-acquires-liveramp-the-data-hub-its-agency-rivals-rely-on/
4. Best Buy, "Best Buy and Amazon expand Fire TV partnership, opening Fire TV ad inventory to Best Buy Ads" (23 September 2026). https://corporate.bestbuy.com/2026/amazon-fire-tv-partnership/
5. Walmart, "Walmart Completes Acquisition of VIZIO" (3 December 2024). https://corporate.walmart.com/news/2024/12/03/walmart-completes-acquisition-of-vizio
6. Walmart, "Walmart completes acquisition of Vibe.co", republished by Vibe.co (4 August 2026). https://www.vibe.co/blog/whats-new/walmart-completes-acquisition-of-vibeco
7. invidis, "Walmart Acquires Vibe.co for USD 1.4 Billion" (24 June 2026). https://invidis.com/news/2026/06/ctv-walmart-acquires-vibe-co-for-usd-1-4-billion/
8. The Desk, "WARC: Retail media ad market to top $200 billion as growth slows" (19 August 2026). https://thedesk.net/2026/08/warc-retail-media-ad-market-to-top-200-billion-as-growth-slows/
9. Marketing Dive, "Lowe's in-houses retail media network operations" (12 January 2023). https://www.marketingdive.com/news/lowes-in-houses-retail-media-network-operations/640267/
10. AdExchanger, "Kroger Is Bringing Its Retail Media Ad Tech In-House" (28 June 2023). https://www.adexchanger.com/retail-media/kroger-is-bringing-its-retail-media-ad-tech-in-house/