Public relations affects AI search visibility, and the size of the effect depends on the category you sell into and the question your buyer asks. Across six answer engines over 135 days, editorial publications carry 11.97 percent of the citations we observe, vendor-owned domains carry 9.53 percent, and the entire wire and press-release class carries 0.21 percent across ten domains. Those three numbers come from our own instrument, and each of them points somewhere different from where the usual advice points.
The measurements below are read from the Machine Relations Index release generated 2026-09-28: 17,868 monitored runs of 1,010 buyer prompts across ChatGPT, Claude, Gemini, Perplexity, Google AI Overviews and Google AI Mode, observed over 135 days, producing 24,639 cited domains.
The Denominator, Stated Before the Findings #
Every share on this page is computed against one quantity: 123,924 domain-run citations, being the sum of cited runs over all 24,639 domains the Index observed. Those domains partition exactly into the nine source classes the Index assigns, each domain assigned to exactly one class, so the nine shares sum to 100 percent.
This matters because "share of AI citations" is the least comparable number in this field. A share of cited domains is a different quantity from a share of citations, which is different again from a share of responses containing a citation, and published figures for earned media's share of AI citations range across an order of magnitude mostly because they count different things. Any figure below can be checked against the release on our own domain.
Two limits on reading it. First, 1,231 of the 1,340 editorial domains sit below the Index's evidence floor of ten observations across seven distinct days and carry the grade collecting rather than a confidence letter. The class totals are sums and hold; no individual tail domain's rate should be read as a stable rate. Second, class boundaries are our taxonomy's, not a law of nature, and one of them matters here: prnewswire.com sits in the editorial-publication class at rank 28 with 191 cited runs, not in wire distribution. Read the wire figure as the ten domains named below. Counting prnewswire.com with them raises the wire family to 448 cited runs, 0.36 percent, still the smallest class in the Index by an order of magnitude.
What Six Engines Actually Cite #
| Source class | Domains | Cited runs | Share | Median runs per domain |
|---|---|---|---|---|
| Other observed source | 20,917 | 76,790 | 61.97% | 2 |
| Editorial publication | 1,340 | 14,834 | 11.97% | 2 |
| Vendor-owned source | 823 | 11,807 | 9.53% | 3 |
| Market and company database | 718 | 6,391 | 5.16% | 2 |
| Community and social platform | 27 | 4,591 | 3.70% | 15 |
| Academic and government source | 431 | 4,229 | 3.41% | 2 |
| Analyst and consulting research | 364 | 3,468 | 2.80% | 2 |
| Search or media platform | 9 | 1,557 | 1.26% | 2 |
| Wire and press-release distribution | 10 | 257 | 0.21% | 6.5 |
The first row is the one most source-mix charts leave out. Nearly 62 percent of what these engines cite goes to the 20,917 domains the Index records in its uncategorized_source class — 85 percent of every domain observed being cited. A model of this market built from six or eight tidy buckets is describing the 38 percent that is easy to label, and a PR strategy built on that model is optimising against a minority of the citation surface.
The Wire Class Is Ten Domains, and That Is the Finding #
Wire and press-release distribution holds 0.21 percent of citations. The reflexive reading is that wire distribution underperforms. The data says something more specific and more useful.
| Wire domain | Cited runs | Citation rate | Days cited | Engines | Grade |
|---|---|---|---|---|---|
| businesswire.com | 106 | 0.59% | 55 of 135 | 6 | B |
| globenewswire.com | 79 | 0.44% | 41 of 135 | 5 | C |
| financialcontent.com | 37 | 0.21% | 25 of 135 | 4 | C |
| einpresswire.com | 17 | 0.10% | 11 of 135 | 2 | collecting |
| signalgenesys.com | 8 | 0.04% | 7 of 135 | 1 | collecting |
| prweb.com | 5 | 0.03% | 5 of 135 | 2 | collecting |
| clarityqst.com | 2 | 0.01% | 1 of 135 | 2 | collecting |
| 10bestpr.com | 1 | 0.01% | 1 of 135 | 1 | collecting |
| newsfilecorp.com | 1 | 0.01% | 1 of 135 | 1 | collecting |
| tuatupr.com | 1 | 0.01% | 1 of 135 | 1 | collecting |
Businesswire and GlobeNewswire are 72 percent of the whole class. Both are cited by five or six engines. Businesswire is cited on 55 separate days across the window. The median wire domain carries 6.5 cited runs against the median editorial domain's 2.
So the wire class is not a low-performing channel. It is a small, saturated, already-cited one. Its share is low because it contains ten domains, and the citations it earns accrue to the wire service, not to the company whose announcement it carried. That is the mechanism a PR buyer needs: the placement is real, and the citation lands on a domain you do not own and cannot displace.
It also explains why the class exists at a size no strategy will change. Wire distribution is a compliance channel before it is a media channel. Regulation FD, 17 CFR Part 243, requires an issuer disclosing material nonpublic information to do so broadly and publicly, and simultaneous wire distribution is the standard method of discharging that duty. A compliance channel optimises for provable simultaneous reach, not for being the most citable account of an event. Buying more of it does not convert it into an editorial channel.
Owned Domains Are Cited More Than the Earned-Media Story Predicts #
The conventional framing sets earned media against owned media and gives owned media almost nothing. Our measurement does not support that.
Vendor-owned sources — company domains, product documentation, corporate research pages — hold 9.53 percent of citations across 823 domains. That is 45.9 times the entire wire class and 79.6 percent of the volume carried by all 1,340 editorial publications. The median vendor-owned domain carries 3 cited runs against the median editorial domain's 2.
Cross-engine reach separates them further. Of 1,340 editorial domains, 61 are cited by all six engines — 4.55 percent. Of 823 vendor-owned domains, 87 are — 10.57 percent, more than twice the rate. The domains doing this are ordinary: microsoft.com at rank 13 with 333 cited runs and grade A, ibm.com at 14, paloaltonetworks.com at 21, hubspot.com at 30, stripe.com at 41. That is owned material: documentation, product pages and company-published research that answers a question directly enough to be retrieved.
The honest version of the earned-versus-owned claim is therefore narrower than the usual one. Earned coverage is one route to citation among several, and in some categories it is the more expensive one. What earned coverage does that owned content cannot is supply an account of your company written by someone who is not you, which is the thing a buyer asking "is this vendor legitimate" is actually looking for. That is a different argument from a citation-share argument, and it survives this data. The citation-share argument does not.
Editorial's Share Is a Category Fact, Not a Constant #
"Earned media dominates AI citations" is a claim whose value moves with the category. Measured within each category's published strata, editorial's share of citations ranges from 5.4 percent to 17.7 percent, and vendor-owned's from 0.1 percent to 21.7 percent — and the two move independently.
| Category | Cited runs | Editorial | Vendor-owned | Community | Wire |
|---|---|---|---|---|---|
| Consumer finance | 6,489 | 17.7% | 2.5% | 4.3% | 0.0% |
| Family software | 3,424 | 16.4% | 0.3% | 4.0% | 0.1% |
| Cybersecurity | 9,772 | 14.6% | 16.5% | 3.6% | 0.3% |
| Healthcare services | 8,247 | 14.6% | 5.5% | 2.6% | 0.3% |
| Martech and advertising | 4,599 | 14.4% | 19.8% | 2.1% | 0.2% |
| HR and talent | 7,784 | 14.3% | 11.6% | 3.2% | 0.3% |
| Consumer products | 5,963 | 12.9% | 0.1% | 4.3% | 0.1% |
| Fintech | 8,372 | 10.1% | 11.9% | 2.5% | 0.5% |
| Enterprise software | 8,203 | 9.6% | 21.7% | 3.0% | 0.1% |
| Consumer health | 7,210 | 9.0% | 0.1% | 2.3% | 0.0% |
| AI infrastructure | 5,291 | 8.3% | 9.3% | 7.7% | 0.0% |
| Education and training | 3,878 | 5.6% | 2.2% | 5.4% | 0.0% |
| Deep tech and hardware | 4,112 | 5.4% | 0.9% | 6.6% | 0.2% |
Two patterns decide PR budgets.
In consumer health and consumer products, vendor-owned sources hold one tenth of one percent while editorial holds 9 to 13 percent. Owned material reaches one tenth of one percent of those answers. Third-party editorial coverage is the route this data supports, and a PR budget is the instrument that produces it.
In enterprise software and martech, vendor-owned exceeds editorial — 21.7 against 9.6, and 19.8 against 14.4. Buyers in those categories get answers assembled substantially from vendor documentation. A PR campaign competing for that share is competing against your own product pages, which you control, publish faster and pay for once.
Cybersecurity, fintech and HR sit between, with both classes in double digits, and those are the categories where the earned-versus-owned question is genuinely a trade-off rather than a foregone conclusion.
PR Coverage Wins News Questions and Loses Buying Questions #
The same measurement across question shapes is sharper than the category cut.
| Question shape | Cited runs | Editorial | Vendor-owned | Community |
|---|---|---|---|---|
| News topic | 45,188 | 16.4% | 16.8% | 3.1% |
| Best X | 14,049 | 12.5% | 6.4% | 3.7% |
| Top list | 14,178 | 10.0% | 5.7% | 2.8% |
| Is X worth it | 11,679 | 10.3% | 6.1% | 4.8% |
| X versus Y | 10,552 | 8.4% | 6.1% | 4.8% |
| Problem first | 9,688 | 8.1% | 5.1% | 6.1% |
| How to choose | 12,034 | 7.2% | 4.8% | 4.1% |
Editorial's share peaks at 16.4 percent on news-topic questions and falls to 7.2 percent on "how do I choose" — a 2.3-fold drop between the question PR is built to win and the question a buyer asks when they are ready to spend money. On how-to-choose questions, 76.1 percent of citations go to the unclassified long tail.
This is the most direct budget implication on this page. A campaign measured on coverage of your announcements is being measured on the question shape where editorial placement performs best and where purchase intent is weakest. The shift is not from PR to something else; it is from announcement coverage toward editorial that answers comparison and selection questions, which is a different pitch, a different outlet list and a different brief to the writer.
Most Citation Relationships Are Single-Engine #
Of all 24,639 cited domains, 16,749 — 68 percent — are cited by exactly one of the six engines. Only 368 domains, 1.49 percent, are cited by all six.
Within editorial publications the concentration is nearly as severe: 773 of 1,340 domains are cited by one engine, and 61 by all six. A placement is therefore, by default, an engine-specific asset. Measuring AI visibility as a single aggregate score hides which engine the coverage actually reached.
The engines differ because their retrieval paths differ, and each documents its own. Google states that its AI features draw on the same web index and standard eligibility as the rest of Search, and documents the eligibility requirements in its own guidance. OpenAI operates distinct crawlers for distinct purposes — a search crawler, a user-triggered fetcher and a training crawler — so a site can be readable to one and closed to another. Anthropic's Claude reaches the web through an explicit web-search tool that returns cited sources for the query it ran rather than browsing continuously. Perplexity exposes domain-level filtering to callers, making the source pool itself a parameter. Microsoft's Copilot family retrieves through the Bing index. Four different retrieval architectures produce four different source pools, which is what a 68 percent single-engine rate looks like from the inside.
The underlying mechanism is ordinary retrieval augmentation: a query is embedded, passages are retrieved from an index, and a generator writes an answer conditioned on them, as in dense passage retrieval and the retrieval-augmented generation architecture. That pipeline reads a press release as it reads any other page: a passage, its retrievability and the corpus it was drawn from — and web-scale corpora such as Common Crawl contain the wire pickup page and the trade article on equal terms, with the difference emerging at retrieval, not at ingestion.
What This Means for a PR Budget #
The discipline itself is unchanged. PRSA defines public relations as building mutually beneficial relationships between organisations and their publics; answer engines are now one of those publics, and they read everything the others read. What changes is where the money goes.
Route by category before anything else. In consumer health, consumer products and family software, vendor-owned citation is at or near zero and editorial coverage is the route this data supports — fund it. In enterprise software and martech, vendor-owned already exceeds editorial, and the marginal dollar buys more as documentation and comparison content on domains you control.
Pitch the selection question, not the announcement. Editorial's citation share nearly halves between news-topic and how-to-choose questions. Coverage that answers "how should a buyer in this category choose" is cited in the moment that decides a purchase; coverage of your funding round is cited in the moment that does not.
Treat each engine as a separate outcome. Two thirds of cited domains reach exactly one engine. Report coverage by engine reached, and stop reporting a single visibility score that averages four unrelated retrieval systems.
Do not buy wire distribution for citations. It has a legitimate compliance purpose and a genuine role in reaching journalists. Its citation value accrues to the ten domains the wire services own. Buy it for the reasons it exists.
Expect the traffic and the citation to come apart. Pew Research Center found that users who encountered an AI summary were less likely to click through to other sites than users who did not, in its March 2025 analysis of real browsing behaviour. Coverage can be cited into an answer read by thousands and send you nothing measurable in analytics. A PR programme judged only on referral traffic will conclude its best-performing work failed.
One boundary worth naming: everything above concerns earned and owned material. Paid placement is a different instrument with its own disclosure obligations, and the FTC's endorsement guides apply to it whether or not a machine is the reader. Coverage bought without disclosure is a legal exposure before it is a citation strategy.
How PR Affects AI Search Visibility in Machine Relations Terms #
Machine Relations is the practice of building the conditions under which machine readers recognise, trust and cite an organisation. PR is one of the oldest instruments available for that, and this measurement locates it precisely: it is how you reach the 11.97 percent of the citation surface held by editorial publications, and in several consumer categories it is the only instrument that reaches any of it.
What the measurement also shows is that the surface is larger and stranger than the earned-media framing suggests. Sixty-two percent of citations go to domains the Index holds in its uncategorized class. Ten domains hold the entire wire class. Owned documentation is cited across all six engines at twice the rate editorial publications manage. The audience for all of it — as the Reuters Institute's Digital News Report tracks on the human side — is moving toward intermediated discovery, where what gets quoted matters more than what gets clicked.
PR's effect on AI search visibility is real, it is measurable per engine and per question, and it is smaller and more specific than the aggregate numbers in circulation imply. That is a better basis for a budget than a single dominance statistic.
What Changed in This Analysis #
This page was first published on 2026-07-23 built on figures licensed from third-party visibility vendors and PR firms. Two of those figures could not be reconciled with each other: an earned-media share of 84 percent and one of 37.6 percent appeared on the same page as though they described the same quantity, and a heading asserted a 420-to-1 ratio that the paragraph beneath it computed as 188 to 1. Neither number could be checked against its source, because both underlying datasets remain proprietary to the firms that sell them.
The analysis has been rebuilt on the Machine Relations Index, which publishes its release, its window, its evidence floor and its per-domain records so that every figure here can be verified against the Index. The findings changed as a result: the earned-media share is smaller than reported, vendor-owned citation is much larger, and the claim that the effect holds one value across categories did not survive measurement. Related re-sourcing of our analysis of citation rates by industry vertical is recorded there.
FAQ #
Does PR directly affect AI search visibility? #
Indirectly, through domain selection. Editorial publications hold 11.97 percent of the citations six engines make across 123,924 domain-run citations in the Machine Relations Index release of 2026-09-28. PR is the instrument that places your account of a subject on those domains. It does not act on the engine; it changes which domains carry your material.
Are press releases effective for AI visibility? #
Wire and press-release distribution holds 0.21 percent of citations across ten domains, of which businesswire.com and globenewswire.com are 72 percent. Those domains are cited — businesswire on 55 of 135 days, by all six engines. The citation accrues to the wire service. Wire distribution serves disclosure obligations under Regulation FD and reaches journalists; the citation it earns lands on the wire service's domain.
Which type of PR generates the most AI citations? #
Coverage that answers selection questions rather than reporting announcements. Editorial's citation share is 16.4 percent on news-topic questions and 7.2 percent on how-to-choose questions, but purchase intent runs the other way. The highest-value placement is an article a buyer's comparison question retrieves, in a category where vendor-owned citation is low — consumer health, consumer products and family software, where vendor-owned sits at 0.1 to 0.3 percent.
How should PR teams measure AI search visibility? #
Per engine, and against a stated denominator. Sixty-eight percent of cited domains are reached by exactly one of the six engines, so a single aggregate visibility score averages four unrelated retrieval systems. Report which engines cited which placement, on how many distinct days, and state whether a share describes citations, cited domains or responses — those three quantities differ by an order of magnitude and are routinely quoted interchangeably.
Does owned content compete with PR for AI citations? #
In some categories it beats it. Vendor-owned domains hold 9.53 percent of citations overall — 79.6 percent of the volume carried by all editorial publications — and 10.57 percent of them are cited by all six engines against editorial's 4.55 percent. In enterprise software, vendor-owned holds 21.7 percent against editorial's 9.6. In consumer health it holds 0.1 percent. Check your category before deciding which budget line buys the citation.