RampID is the pseudonymous identifier LiveRamp assigns to an individual, and to the household that individual belongs to, so that separate companies can recognize the same person in their own databases without exchanging names, email addresses or phone numbers. It exists because marketing data is scattered. A retailer holds a purchase history keyed to an email address, a broadcaster holds a subscriber file keyed to a postal address, and a demand-side platform holds a bid opportunity keyed to a browser cookie. RampID is the common key that lets those three records be treated as one person, with the personally identifiable information (PII) that produced the match stripped out before anything moves.

Construction runs through two graphs. The first is AbiliTec, Acxiom's offline recognition technology, which resolves scattered representations of a person, several email addresses, a maiden name, three former postal addresses, into a single AbiliTec Link. The second is the LiveRamp Identity Graph, which maps devices to people using deterministic linkages passed in by match partners. According to LiveRamp's documentation, PII entering the system is briefly decrypted in memory inside a segregated "translation zone", replaced with a 16-character AbiliTec link, then salted and hashed twice to produce the RampID. Original PII files are held encrypted for 30 days for United States data and seven days for European Union data before deletion.

How the identifier is structured

A RampID is not one string type but several, and the differences matter for match rates. Each has a two-letter prefix, a four-digit partner encoding that makes the value unique to the receiving company, and a unique value. Because the encoding differs per client, two partners holding the same underlying person carry different strings, which LiveRamp describes as a measure that reduces the probability of collusion. Translating between encodings requires LiveRamp's Translation API.

Maintained RampIDs, prefixed XY, are 49 characters and returned when a persistent record exists in the AbiliTec graph. Derived RampIDs, prefixed Xi, are 70 characters and returned when no maintained record exists. Derived values are algorithmically generated from the input string, so the same PII always yields the same derived RampID, but they are not held in the graph and can be promoted to maintained status later as the graph fills in. Placeholder RampIDs cover devices with no PII attached at all: Xc for cookies, Xm for mobile device identifiers, both 49 characters. Household RampIDs are 49 characters; LiveRamp's own documentation renders the household prefix as both hY and HY across different help sections, with Hi for the derived household version.

Most companies elect to receive maintained and derived values together. That choice trades precision for coverage, since derived identifiers represent a touchpoint LiveRamp has not yet resolved to a complete person.

Where it sits in the bid stream

On the sell side, the delivery mechanism is the Authenticated Traffic Solution (ATS), the JavaScript and SDK layer LiveRamp launched in 2019. When a visitor submits an email address to a publisher site, ATS exchanges it for an encrypted identity envelope, a Base64 string containing one or more RampIDs plus metadata, an initialization vector, and, depending on configuration, PAIR identifiers or Facebook-scoped envelopes. The envelope is opaque to the publisher and to anything downstream that lacks the key.

In Prebid.js the module is identityLinkIdSystem, the EID source is liveramp.com, and the envelope is written to a cookie or HTML5 storage under the required name idl_env. Prebid documentation instructs publishers to set a 15-day expiry, advising the same window for General Data Protection Regulation and California Consumer Privacy Act compliance and permitting 30 days only for traffic outside the EU, EEA and United States, and to refresh every 1,800 seconds because LiveRamp rotates the encryption key. A stale envelope carries stale consent signals and demand partners may decline to transact against it.

The supply-side platform decrypts the envelope using Sidecar, LiveRamp's decoding application, and writes the DSP-specific RampID into the bid request. The buying platform, holding its own encoding of the same graph, matches that value against segments it already stores. Nothing in the chain requires the publisher to send an email address to a bidder.

Origin and evolution

Acxiom built the online system in 2016 under the name IdentityLink, sitting alongside the older AbiliTec offline graph. Acxiom's 2018 10-Q described IdentityLink as its identity platform, connected to 650 ecosystem partners, with subscription pricing tiered by data volume. Index Exchange announced general availability through its wrapper in February 2019 and extended support to the United Kingdom, Europe and Asia-Pacific in July 2020. LiveRamp reported the launch of ATS in the quarter ending June 2019, alongside a direct customer count of 690.

The rename landed on May 24, 2021, with LiveRamp stating that IdentityLink and IDL would persist in some interfaces until the transition completed in September 2021. In September 2022 RampID became a pre-selected identifier in certain destination accounts rather than an option bundled under a generic platform setting, a change LiveRamp framed as preparation for third-party cookie deprecation. Integration with Amazon Marketing Cloud followed in February 2024, connecting first and third-party data for measurement and activation on Amazon DSP.

Google's Publisher Advertiser Identity Reconciliation protocol became a parallel route. LiveRamp was named a launch partner for the clean room component and described PAIR adoption as feeding ATS directly, since both sides must consent to share first-party data. By the January 2025 Display & Video 360 rollout, more than 20,000 publisher domains had integrated PAIR through ATS.

Commercial weight

Scale is the argument. LiveRamp's data collaboration network spans over 900 partners, and the graph sits across roughly 80 percent of top comScore publishers. The company reported first-quarter fiscal 2027 revenue of $214.0 million, annualized recurring revenue of $539 million and 845 direct subscription customers. RampID also carries beyond display: it supplies the identity layer in Google's Kroger shopper-data integration with Display & Video 360, and SiriusXM Media and AdsWizz extended it across streaming and podcast inventory in May 2026.

That ubiquity is why ownership became contested. Publicis Groupe agreed on May 17, 2026 to acquire LiveRamp at $38.50 per share, an equity value of $2.5 billion and an enterprise value of $2.167 billion after net cash. The customer roster named in filings examined by PPC Land includes WPP, Omnicom-IPG, Dentsu, Havas and Stagwell, all direct competitors of the acquirer. Omnicom accelerated an exit already scheduled for the first quarter of 2028, with chief executive John Wren pointing to Acxiom's in-house Real ID as the substitute, according to Digiday reporting cited in PPC Land's account of the week.

Limitations and disputes

The technical limitations are documented by LiveRamp itself. A single real person routinely holds several maintained RampIDs when different PII touchpoints have not yet been resolved together. Graph updates can silently change the RampID attached to a device, and LiveRamp provides no mapping from old values to new ones and no signal that a transition occurred, which pushes reconciliation onto the partner. Coverage also depends on authentication: no login, no envelope, and the identifier falls back to placeholder values carrying no person-level meaning.

The contested question is whether pseudonymization is a privacy control or a labeling exercise. A February 2024 report by Cracked Labs, authored by Wolfie Christl and Alan Toner and commissioned by the Open Rights Group, put identity records at 250 million people in the United States, 45 million in the United Kingdom and 25 million in France, and estimated the system is queried more than 60 billion times a day. According to the report, LiveRamp's earlier description of the identifier as anonymous was misleading or arguably deceptive. Open Rights Group filed complaints with UK and French regulators on February 28, 2024.

Litigation followed in the United States. In Riganian v. LiveRamp Holdings, filed in the Northern District of California on January 24, 2025, Judge Jon Tigar denied most of LiveRamp's motion to dismiss on July 18, 2025, allowing claims under the California Constitution, the federal Wiretap Act and the California Invasion of Privacy Act to proceed. The court declined to hold as a matter of law that aggregating and selling comprehensive online and offline data without individual knowledge is not highly offensive. The complaint cites LiveRamp's own figure of more than 250 million resolved United States consumers and states that ATS code reaches over 21,000 publisher domains. LiveRamp disputes the characterization and points to contractual and technical guardrails, customer ownership of data, and consent signals carried in the envelope.

Adjacent terms

AbiliTec ID is the offline identifier built from PII in Acxiom's reference bases. RampID is the pseudonymized online representation derived from it. Identity envelope is not a RampID but a container: an encrypted, randomized, time-limited wrapper that transports RampIDs through public channels. ATS is the publisher-side capture mechanism that produces envelopes; RampID is the identifier inside. Unified ID 2.0, operated through The Trade Desk, is a competing token built from hashed and salted emails with rotating salts, distinct in that it is not backed by a proprietary offline graph. LiveRamp holds a native RampID integration with The Trade Desk's European Unified ID.

Recent developments

LiveRamp shareholders approved the Publicis takeover on August 17, 2026 with minimal dissent while rejecting executive merger compensation by roughly six to one. Closing remains scheduled before the end of 2026. In the interim the company has continued shipping connections rather than defending share: Meta campaign data was added to Cross-Media Intelligence on August 4, 2026, and a CAPI Hub connector reached multichannel video programming distributors through DIRECTV in April 2026. Whether an identifier premised on neutrality keeps that character inside the largest agency holding company is the open question for buyers renewing contracts.

Timeline

  • 2016: Acxiom launches the online identity system as IdentityLink, alongside the existing AbiliTec offline graph
  • February 2019: Index Exchange announces general availability of IdentityLink through its wrapper
  • Quarter ending June 2019: LiveRamp launches the Authenticated Traffic Solution
  • July 2020: Index Exchange extends IdentityLink support to the UK, Europe and Asia-Pacific
  • May 24, 2021: LiveRamp renames IdentityLink to RampID, with the transition completed in September 2021
  • September 15, 2022: RampID becomes a pre-selected identifier in certain LiveRamp destination accounts
  • February 2024: LiveRamp announces RampID integration with Amazon Marketing Cloud and Amazon DSP
  • February 28, 2024: Cracked Labs publishes its RampID report; Open Rights Group files complaints with UK and French regulators
  • January 24, 2025: Riganian v. LiveRamp Holdings filed in the Northern District of California
  • January 21, 2025: PAIR rolls out broadly in Display & Video 360, with over 20,000 publisher domains integrated via ATS
  • July 18, 2025: Court denies most of LiveRamp's motion to dismiss
  • May 17, 2026: Publicis Groupe agrees to acquire LiveRamp at $38.50 per share
  • May 28, 2026: SiriusXM Media and AdsWizz extend RampID across programmatic audio
  • August 17, 2026: LiveRamp shareholders approve the takeover; closing expected before the end of 2026

Summary

Who: LiveRamp Holdings (NYSE: RAMP), the San Francisco company that operates RampID, together with the publishers, supply-side platforms, demand-side platforms, retailers and measurement vendors that transact against it. Publicis Groupe is the pending owner.

What: A pseudonymous people-based and household-based identifier, produced by hashing and salting an AbiliTec link derived from offline PII, issued in maintained, derived and placeholder versions with partner-specific encodings, and transported through the bid stream inside encrypted identity envelopes.

When: Created by Acxiom in 2016 as IdentityLink, renamed RampID on May 24, 2021, and now moving into agency-holding-company ownership following the August 17, 2026 shareholder vote.

Where: Across open web display, connected television, programmatic audio, retail media and clean room measurement, with the deepest coverage in the United States and growing international scope.

Why: Third-party cookies and mobile advertising identifiers degraded as cross-company keys. RampID substitutes a deterministic, authentication-based join key that survives browser restrictions, at the cost of concentrating population-scale identity records in one commercial intermediary, a concentration now under litigation in California and regulatory complaint in Europe.