Research · public sources only
Six vendors. Six invoices.
Not one claims a source the others don't.
If four vendors return the same phone number, that number is probably right. This page tests the assumption using only what the vendors publish about themselves — their marketing pages, their SEC filings, and the federal record. Every claim below is sourced and checkable in a browser.
What each vendor says about its own data
TLOxp
Owned by TransUnion since 2013
Marketed as drawing on more than 10,000 public and proprietary data sources and over 100 billion records. TransUnion's own annual filing describes its datasets as built from thousands of sources including financial institutions, private databases, and public records repositories — and states it has acquired public record datasets outright.
SEC EDGAR, Form 10-K · transunion.com
LexisNexis Risk Solutions
A RELX business
Its own collections and recovery skip-tracing page describes incorporating public records — address, driver's license, bankruptcy, property ownership — together with proprietary sources, employment information, and financial insights.
risk.lexisnexis.com
Whitepages
B2B arm spun off as Ekata, 2019
Describes its contact data as collected from property deeds, telecom companies, and public records. Structural note worth confirming against your own contract: the business-to-business arm spun off as Ekata in 2019, and Mastercard acquired Ekata in 2021 in a deal reported at $850 million.
whitepages company documentation · ekata spin-off announcement, june 2019
IDI (idiCORE)
A red violet company
Described as assimilating and unifying proprietary data, public record data, and publicly available data covering nearly the entire U.S. adult population.
idicore product documentation
Pipl
No sourcing disclosure published
Pipl's public site names no upstream data sources and no corporate parent. On a question every other provider on this page answers in writing, Pipl does not. That is not evidence of overlap — it is the absence of evidence either way, which is its own answer when you are trying to establish whether two providers are independent.
pipl.com · homepage and about pages, checked september 2026
Trestle
No sourcing disclosure published
Publishes identity data APIs covering phone validation, reverse phone lookup, and reverse address lookup, but does not document its upstream sourcing in the detail the other providers do.
trestleiq.com · checked september 2026
The pattern
Read the six descriptions next to each other. Four of the six disclose their inputs; the other two disclose nothing at all. Everything disclosed reduces to the same short list, and where contact data is concerned the list is three categories long.
Public records
Named in all four disclosures
Telecom / carrier
Where current numbers originate
Credit header
The common floor, licensed under GLBA
Not one of these vendors claims an input category the others do not also claim. That is not an accusation — it is what the industry looks like from the inside, and each of them describes it accurately in its own materials. The problem is what it does to your file.
Underneath this market sits credit header data: the non-credit portion of a consumer file — name, current address, phone — available to licensed users under Gramm-Leach-Bliley agreements, and frequently the most current number available. Your floor sees four confirmations. What happened is one record, invoiced four times, and a wrong number four vendors agree on survives review precisely because the count makes it look verified.
The federal record
This is not a novel observation. The Federal Trade Commission's 2014 study of the data broker industry documented a circular economy in which brokers buy data from each other, resell it, and cross-reference it — with larger business-to-business brokers feeding consumer-facing people-search sites, which in turn feed smaller aggregators. An opt-out from one broker fails because the record returns from a partner's database. The same mechanism that defeats a consumer's deletion request is the one that inflates your corroboration count.
ftc.gov · data brokers: a call for transparency and accountability, may 2014
What this page can't tell you
How much it costs you. Public documentation establishes that these providers draw on overlapping categories of input. It cannot establish how often your accounts, run through your provider stack, produce agreement that collapses to a single upstream source. That number is specific to your file and your contracts, and nobody — including us — can quote it without running it.
That measurement is what the Quorum vendor overlap audit produces: for every account, which providers returned something no other provider did, which returned only what was already present, and how many genuinely independent sources stand behind each contact your team is about to work.
Sources
- TransUnion, Investigations (TLOxp) product pages — transunion.com
- TransUnion, Form 10-K FY2024 — SEC EDGAR
- Corporate research profile: TransUnion acquisition of TLO, 2013 — investigate.afsc.org
- LexisNexis Risk Solutions, Skip Tracing for Collections and Recovery — risk.lexisnexis.com
- Whitepages company data documentation
- Whitepages Pro / Ekata spin-off announcement, June 2019 — globenewswire.com
- idiCORE (IDI, a red violet company) product documentation
- Federal Trade Commission, Data Brokers: A Call for Transparency and Accountability, May 2014 — ftc.gov
- Pipl and Trestle public websites, checked September 2026
- Gramm-Leach-Bliley Act, 15 U.S.C. §6801 et seq., credit header licensing
Every source above is publicly accessible. Nothing on this page is derived from customer data.