{"id":92407,"date":"2025-09-02T13:06:26","date_gmt":"2025-09-02T13:06:26","guid":{"rendered":"https:\/\/mailinvest.blog\/index.php\/2025\/09\/02\/media-buyers-block-publicis-epsilon-ssp-over-data-leakage-concerns\/"},"modified":"2025-09-02T13:07:24","modified_gmt":"2025-09-02T13:07:24","slug":"media-buyers-block-publicis-epsilon-ssp-over-data-leakage-concerns","status":"publish","type":"post","link":"https:\/\/mailinvest.blog\/index.php\/2025\/09\/02\/media-buyers-block-publicis-epsilon-ssp-over-data-leakage-concerns\/","title":{"rendered":"Media Buyers Block Publicis\u2019 Epsilon SSP Over Data Leakage Concerns"},"content":{"rendered":"

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Within the notoriously advanced digital promoting provide chain, some manufacturers and their companies, together with a handful of the world\u2019s largest promoting holding firms, have funneled cash and knowledge to rival Publicis Groupe with out figuring out it.\u00a0\u00a0\u00a0<\/p>\n

Media consumers worry that by unknowingly buying resold writer stock\u2014routed by means of Publicis\u2019 Epsilon-owned supply-side platform (SSP) to different SSPs in open-web auctions\u2014they\u2019ve each funded a competitor and revealed their viewers focusing on methods. Epsilon SSP is the one main SSP in the marketplace owned by an company or holdco.<\/p>\n

Over the previous 18 months, the media-buying arms of WPP, IPG, Dentsu, and Havas\u2014together with at the least 4 impartial companies and one brand-side programmatic staff\u2014bought advert stock not directly by means of Publicis\u2019 Epsilon SSP, in accordance with bid response knowledge reviewed by ADWEEK. For instance, final 12 months, WPP dealt with buys for present model Moonpig, Dentsu for United, Havas for Sanofi, and IPG for Truvia and Bristol Myers Squibb, all in circumstances the place Epsilon SSP resold the stock by means of one other SSP.<\/p>\n

Some consumers at the moment are blocking Epsilon SSP over considerations that, by transacting on the platform, they\u2019ve not solely funneled {dollars} to Publicis but in addition uncovered priceless knowledge to a direct competitor. This knowledge consists of the quantity they\u2019re prepared to spend on particular stock, inventive belongings, and the audiences they\u2019re focusing on\u2014indicators these media consumers say could possibly be used to achieve a aggressive benefit.<\/p>\n

These findings come from an ADWEEK evaluation of publicly accessible provide path knowledge from adverts.txt and sellers.json recordsdata and a evaluation of historic bid response knowledge, together with conversations with 5 model and company media consumers who have been granted anonymity to talk freely about proprietary practices.\u00a0<\/p>\n

\u201cBid requests and responses, carrying data essential to ship an advert, should not a aggressive benefit,\u201d a spokesperson for Publicis instructed ADWEEK, including: \u201cIt\u2019s regarding that skilled consumers are both unaware of, or just not utilizing, the reporting instruments accessible to them by means of their DSP to totally view each \u2018hop\u2019 in a programmatic path.\u201d<\/p>\n

\u201cIf different holding firms select to not use our platforms, that’s their choice, and one that’s immaterial to our operations,\u201c the spokesperson stated.<\/p>\n

WPP, IPG, and Havas declined to remark. Dentsu didn’t reply to a request for remark. Moonpig, United, Sanofi, Truvia, and Bristol Myers Squibb didn’t reply to requests for remark.<\/p>\n

Resold stock provides complexity and prices<\/strong><\/h4>\n

In lots of circumstances, consumers didn\u2019t know they have been transacting on Epsilon SSP due to a typical however opaque adtech apply known as \u201cmulti-hop reselling,\u201d the place an advert impression passes by means of a number of SSPs or exchanges earlier than reaching the advertiser\u2019s shopping for platform. This could typically put media consumers at midnight about the entire gamers of their provide chains.\u00a0<\/p>\n

To keep away from opacity in programmatic provide chains, some consumers go for direct relationships with publishers or personal market offers during which publishers make their stock accessible to a choose, invite-only group of consumers.\u00a0<\/p>\n

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Reselling, however, complicates the provision chain, making it troublesome for advertisers to know which arms the provision handed by means of. It additionally provides further charges for the advertiser since every middleman takes a reduce.<\/p>\n

Epsilon SSP typically acts as a reseller, the time period for any middleman approved by the writer to resell their stock, even when that middleman doesn\u2019t take possession of it, in accordance with the Interactive Promoting Bureau. Epsilon SSP is allowed to amass digital advert stock from different SSPs or exchanges\u2014and likewise to resell it to SSPs together with Magnite, PubMatic, Nexxen, and OpenX, in accordance with publicly-available sellers.json and adverts.txt recordsdata.\u00a0<\/p>\n

Provide path knowledge seen by ADWEEK reveals that Epsilon SSP is usually the second, third, or fourth \u201chop\u201d away from the unique writer. This implies an advertiser shopping for from PubMatic, for example, may be buying an impression that was resold by means of Epsilon, which can itself have sourced the stock from one other upstream middleman.<\/p>\n

For instance, within the following visible, a set of pattern provide paths for information writer 9News.com is proven, the place Epsilon could also be each a purchaser of stock resold from different SSPs and a reseller to downstream SSPs. 9News declined a request for remark.<\/p>\n

Patrons are anxious about sharing knowledge with Publicis<\/strong><\/h4>\n

Patrons could not know they\u2019re buying resold stock from Epsilon or transacting on its platform, however it’s finally the client\u2019s accountability to know their very own provide paths, three consumers stated.<\/p>\n

\u201cIt\u2019s not likely an issue in the event that they\u2019re reselling,\u201d stated a type of consumers, who blocked Epsilon SSP after shopping for resold stock for non-Publicis purchasers. \u201cThe issue is that entrepreneurs in every single place are unknowingly doubtless giving their knowledge to their rivals.\u201d\u00a0<\/p>\n

Like every SSP within the digital advert provide chain, Epsilon SSP not solely takes a reduce with every transaction, but in addition beneficial properties entry to bid response knowledge shared by the demand-side platform.This consists of indicators just like the advertiser\u2019s id, URL of the stock, inventive attributes, measurement of the advert, and value of the advert house, in accordance with the Interactive Promoting Bureau\u2019s business requirements.\u00a0<\/p>\n

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SSPs additionally see bid request knowledge from the writer facet\u2014which incorporates parameters like person ID, machine kind, geolocation, and blocked classes. Any SSP, change, or reseller within the chain sees each request and response knowledge for the transactions they facilitate, besides in uncommon circumstances the place some knowledge is purposefully obfuscated.\u00a0<\/p>\n

All this knowledge offers SSPs the power to make inferences a few given advertiser\u2019s technique\u2014notably the audiences they’re focusing on\u2014primarily based on the bidstream knowledge it receives, in accordance with conversations with 9 totally different programmatic specialists.<\/p>\n

A kind of specialists, who oversees a well-liked SSP, stated that any SSP \u201cmay arguably reverse engineer the whole marketer\u2019s technique when you wished to.\u201d\u00a0<\/p>\n

As an illustration, this exec stated, an SSP may confirm doubtless viewers segments {that a} given advertiser is focusing on if it noticed the advertiser incessantly bidding on placements for 18- to 24-year-olds out there for a brand new automotive. The identical could possibly be accomplished for contextual placements by associating bids with URLs.\u00a0<\/p>\n

The U.S. Division of Justice made an identical argument in its landmark antitrust case in opposition to Google\u2019s adtech enterprise, which resulted in a federal ruling that decided Google operated an unlawful monopoly over advert exchanges and advert servers. The federal government claimed in its grievance that \u201cpublic sale knowledge, together with knowledge regarding bidding, accessible impressions and gained impressions, allow advert tech merchandise to enhance their algorithms.\u201d It additionally alleged that \u201can advert tech supplier that may see at scale who bids on stock and at what costs can create bidding methods to extra reliably win future auctions for comparable stock.\u201d\u00a0<\/p>\n

Whereas this logic could apply to any SSP or advert change working open change auctions, Epsilon SSP stands out: It\u2019s the one main SSP owned by an promoting holding firm. That makes Publicis the one company community with direct entry to advertisers\u2019 marketing campaign knowledge within the programmatic ecosystem whereas concurrently competing for these advertisers\u2019 enterprise. Some consumers see this twin position on each the purchase and promote sides as a possible battle of curiosity.<\/p>\n

\u201cNo different holding firm has a majority or full possession over part of the ecosystem that everyone transacts and performs in,\u201d an company media purchaser stated.\u00a0<\/p>\n

The corporate stated it retains its buy-side and sell-side operations separate.\u00a0<\/p>\n

\u201cThe buy-side can by no means see bid data obtained on the sell-side both in actual time or after the very fact, due to technical and operational firewalls (together with totally different groups and engineering programs) which are usually audited by a 3rd social gathering,\u201d a Publicis spokesperson stated. They added that \u201cany consumer utilizing each its buy-side and sell-side companies does so in full transparency, with a number of and repeated guide opt-ins.\u201d<\/p>\n

When requested, the corporate declined to supply extra details about what sorts of firewalls are in place.\u00a0<\/p>\n

\u201cThis knowledge will not be logged or saved by Epsilon\u2019s SSP. Even when it have been, it’s not potential to make use of it to achieve perception right into a marketing campaign\u2019s technique or targets,\u201d the Publicis spokesperson stated.<\/p>\n

The chief of a special main SSP, talking on situation of anonymity, disputed that an SSP wouldn’t log or retailer bid knowledge, saying it\u2019s \u201cnormal\u201d apply for SSPs to retailer each bid request and bid response knowledge, because it\u2019s \u201cvital for observability, telemetry, troubleshooting.\u201d Additionally they stated that storing bid response knowledge is important for imposing advertiser blocklists and offering correct reporting for advertisers.<\/p>\n

\u2018Offended and annoyed,\u2019 consumers block Epsilon SSP<\/strong><\/h4>\n

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5 media consumers instructed ADWEEK they found they have been shopping for by means of Epsilon SSP by way of reseller paths with out realizing it. All 5 have since blocked the platform\u2014one as a part of a broader crackdown on reseller site visitors, one on account of media high quality considerations, and three particularly to keep away from sending cash and knowledge to Publicis.<\/p>\n

One Fortune 500 model unintentionally purchased 10 million impressions resold by Epsilon SSP between July 2023 and April 2024 by way of SSPs like PubMatic and Magnite, in accordance with an in-house media purchaser talking on situation of anonymity. PubMatic identified that advertisers choose their very own media shopping for methods and partnerships, and underscored the top quality of the media it represents. Magnite declined to remark.<\/p>\n

The customer argued that Epsilon SSP is \u201ctaking margin\u2026and decreasing working media for manufacturers which will or will not be Publicis purchasers,\u201d including that \u201cthe potential for it to be an issue, and a battle of curiosity, is very large.\u201d<\/p>\n

The corporate has since eradicated most reseller paths. The customer additionally famous that Epsilon SSP wouldn\u2019t be thought of as a possible provide companion for the model in any respect as a result of \u201can SSP owned by a holdco could be working with incentives that don’t align properly with advertiser aims.\u201d<\/p>\n

A special agency-side purchaser stated they felt \u201coffended and annoyed\u201d after unwittingly shopping for Epsilon SSP\u2019s stock by means of different SSPs for a number of purchasers final 12 months. The customer blocked Epsilon SSP from all of its provide paths, citing considerations about self-preferencing.<\/p>\n

They added: \u201cI’m not within the enterprise of funding a competitor.\u201d<\/p>\n

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