PubMatic

Advertising

PubMatic loaded on 79 sites in our October 2026 scan: 3% of the 2,450 most-visited sites we checked, before any visitor had given consent.

Category: Advertising. A company can do several jobs; this is its main role on the pages we saw.

Its cookies typically last about 13 months. On 71% of the sites where it loaded, a consent banner was already present but hadn't been answered yet. It's especially common on .jp sites: 24% of them load it, versus 3% of all sites we scanned.

About PubMatic

PubMatic is a publicly traded sell-side advertising platform that runs the auctions publishers use to sell their ad space programmatically.

Its ads.pubmatic.com domain typically handles a bid request or cookie-sync call as part of an auction happening in the background, matching an identifier across the ad exchanges involved.

PubMatic participates in the Network Advertising Initiative's opt-out program.

Often loaded alongside

Sites that load PubMatic most often also load Google Ads (91%), Google (86%), Google Analytics (85%), Magnite (76%), and Index Exchange (66%).

Domains it loads from

ads.pubmatic.com
hbopenbid.pubmatic.com
image2.pubmatic.com
ut.pubmatic.com
image6.pubmatic.com
simage2.pubmatic.com
image8.pubmatic.com
sshowads.pubmatic.com
st.pubmatic.com
openbid.pubmatic.com
t.pubmatic.com
event-va1.pubmatic.com

Cookies

pi47 sites
KTPCACOOKIE15 sites
KADUSERCOOKIE14 sites
chkChromeAb67Sec6 sites
SyncRTB*6 sites
chk5 sites

Sites that load PubMatic

The highest-ranked 30 of 79 sites.

amazon.com33 tracking companies
datadoghq.com14 tracking companies
globo.com24 tracking companies
amazon.co.za32 tracking companies
indiatimes.com18 tracking companies
techcrunch.com38 tracking companies
elpais.com7 tracking companies
usps.com24 tracking companies
fidelity.com15 tracking companies
nexusmods.com5 tracking companies

Show 20 more sites

elmundo.es20 tracking companies
amazon.com.mx34 tracking companies
instructure.com17 tracking companies
as.com7 tracking companies
vnexpress.net14 tracking companies
marktplaats.nl4 tracking companies
mundodeportivo.com13 tracking companies
netkeiba.com20 tracking companies
jalan.net27 tracking companies
tenki.jp27 tracking companies
weathernews.jp7 tracking companies
oricon.co.jp36 tracking companies
aternos.org19 tracking companies
syosetu.com24 tracking companies
carsensor.net31 tracking companies
24h.com.vn20 tracking companies
aajtak.in7 tracking companies
kakuyomu.jp18 tracking companies
indianrail.gov.in10 tracking companies
piccoma.com25 tracking companies

Understanding this page

What the tracker categories mean
What "advertising," "analytics," "social," "consent" and the rest actually mean for a company or a cookie, and how CookieTosser decides which one applies.
First-party vs third-party cookies (and why "first-party" still tracks you)
What the distinction actually means technically, why browsers only block one of the two, and how CNAME cloaking, server-side tagging and cookies like _ga let sites keep tracking under their own domain.
How to block or limit trackers
Browser privacy settings, content blockers, Global Privacy Control and clearing cookies compared honestly — what each one actually stops, what it doesn't, and what it costs you in return.