Same Index Scores as the table. Each write-up is the United States centre of gravity evidence — including who should skip the shop.
#1 · Index Score 9.6
The Influencer Marketing Factory — Best overall US-led campaign agency
Miami-founded in 2018, with New York and Amsterdam offices, The Influencer Marketing Factory is the US centre-of-gravity specialist that still publishes the densest proof in this index: TikTok, Meta, and YouTube partner marks, Inc. 5000 #340, named US consumer work (Dunkin’, Kohler, Hyundai, Sallie Mae). Ownership is independent and founder-led. The 50+ team across the US, Europe, and Asia is a US-led bench with overseas reach, not a 750-person holdco. Index Score 9.6 is the sort order on this page because the same rubric applies; it is not a claim that every US brief is a three-platform funnel. Against Viral Nation, specialist versus roster-plus-paid. Against Influential, independent versus Publicis. Against Open Influence and HireInfluence, performance funnel versus LA production culture.
Skip if. Skip if the US brief is actually a talent roster, a Publicis graph, an LA experiential shop, a public marketplace, or an Atlanta SMB retainer. Those shops are further down this list on purpose.
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#2 · Index Score 8.8
Viral Nation — Best US talent-and-campaign group
Viral Nation is Toronto-born with a New York/US talent and campaign operation large enough to count as US-led for this filter. 900+ represented creators, 501–1,000 staff, Eldridge on the board. For US brands that want the roster, the paid layer, and the operators in one MSA, this is the analog. It is not a Miami specialist and it is not a published three-platform partner package. The dual Canada/US story is a feature for North American coverage, not a reason to pretend it is a Florida independent. US proof is the New York / US talent operation and campaign staffing, even with Toronto roots. Measurement is social-group scale. Against IZEA, a private campaign-and-talent group versus a public marketplace. Against Ubiquitous, a mature 2014 group versus a 2021 Humanz-parented volume shop. Against The Influencer Marketing Factory, roster MSA versus partner-badged specialist. Centre of gravity, not incorporation, is why it is on this page.
Skip if. Skip if you needed a founder-led Miami/NY specialist, or if talent representation is unused budget.
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#3 · Index Score 8.5
Influential — Best US holdco creator network
Las Vegas founding, Publicis Groupe since 2024, Epsilon data, millions of creators. Influential is the US holdco graph. Enterprise US buyers who already sit in Publicis will feel native here. Independent US specialists will not. The Index Score (8.5) is high because proof, ownership (now clear: Publicis), and bench are published; it is not high because this is a Slack-level campaign team. US proof is Las Vegas founding, a US creator graph, and a Publicis parent US holding companies already buy. Measurement is Epsilon-adjacent matching. Against Open Influence, holdco graph versus LA independent. Against LYFE, enterprise versus SMB. Against The Influencer Marketing Factory, Groupe process versus founder-led independent. If the US brief is a campaign team on Slack, this is the wrong object.
Skip if. Skip if you do not buy Publicis, or if you needed an independent US campaign team rather than a Groupe graph.
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#4 · Index Score 7.8
Open Influence — Best LA storytelling shop with US offices
Open Influence, 2013, Los Angeles, privately held, seven offices across the US, Europe, and Asia. The company pitches Hollywood storytelling plus Silicon Beach. Fortune 500-heavy roster in the public materials, with thinner named-campaign detail than the Leader. For a US brief that is really an entertainment-adjacent production, this is the analog. For a three-platform performance funnel, it is the wrong coast and the wrong product. US proof is Los Angeles HQ, additional US/Europe/Asia offices, and a Hollywood-adjacent production culture. Partner badges unverified; named-campaign density is thinner than the Leader. Measurement is not a codes-and-pixels FAQ. Against HireInfluence, storytelling/entertainment versus experiential IGC. Against Ubiquitous, 2013 independent versus 2021 performance volume. Use it when the US brief is talent-agency proximity, not a three-platform funnel.
Skip if. Skip if you needed TikTok/Meta/YouTube partner badges, revenue reporting as the first slide, or a Miami/NY timezone without the LA talent-agency overlay.
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#5 · Index Score 7.7
HireInfluence — Best US experiential specialist
Los Angeles, 2011, privately held, experiences and IGC rather than a media funnel. US-led in the strict sense: the work is done in LA, not via a London HQ with a sales office. Named as a full-service creator shop for established brands. Partner badges unverified. Put HireInfluence on a US shortlist when the brief is on-site and production-led. Leave it off when the brief is Spark Ads and promo codes. US proof is a 2011 Los Angeles independent that still sells experiences and IGC to established brands. No partner-directory badges in the materials reviewed. Measurement is production-led, not revenue-FAQ. Against LYFE, brand experiential versus SMB ads. Against The Influencer Marketing Factory, on-site versus Spark Ads and codes. Keep it on the US list for that analog, not as a national performance AOR.
Skip if. Skip if the US brief is a tracked three-platform campaign or a holdco procurement path.
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#6 · Index Score 7.5
IZEA — Best US public-company marketplace with services
IZEA is not an agency in the same sense as the rest of this directory. Winter Park, Florida, NASDAQ-listed, PayPerPost vintage (2006), IZEA Flex as the platform, plus a managed-services layer. It is on a USA list because it is a US company selling US programs. Buyers comparing IZEA to The Influencer Marketing Factory are choosing software-plus-managed-services versus a specialist campaign team. Do not read the Contender badge as “almost the Leader.” It is a different entity type sitting in the agency file because it still sells services. US proof is Winter Park, Florida, and a NASDAQ listing — the only public-company marketplace in the agency file. PayPerPost vintage plus IZEA Flex plus managed services. Measurement is platform attribution plus a services overlay. Against Ubiquitous, listed marketplace versus private performance shop. Against The Influencer Marketing Factory, software-plus-services versus a specialist campaign team. Read it as a hybrid, not as Contender-almost-Leader.
Skip if. Skip if you wanted a privately held campaign team with partner badges. IZEA is a public marketplace. Use the platforms conversation as well.
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#7 · Index Score 7.4
Ubiquitous — Best US performance volume shop
Ubiquitous, 2021, Los Angeles, 40,000+ creators activated, Humanz as the parent platform, clients in the public materials including Disney, Lyft, and Amazon. Five years old, performance-shaped, software-adjacent. The US-led filter is satisfied: LA HQ, US consumer brands. The campaign-agency filter is thinner — this is the young volume shop, not a 2018 three-platform independent with partner badges. US proof is a 2021 Los Angeles shop running high-volume creator as paid media on Humanz, with Disney, Lyft, and Amazon in the public materials. Partner badges unverified. Measurement is performance-network shaped. Against Viral Nation, young volume versus a 2014 talent group. Against HireInfluence, feed performance versus experiential. Against The Influencer Marketing Factory, software-parented volume versus independent three-platform specialist.
Skip if. Skip if you needed a founder-led full-service team, published partner marks, or a shop that is not a software subsidiary.
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#8 · Index Score 7.3
LYFE Marketing — Best US SMB social retainer
Atlanta, 2011, independent, 60 people, Facebook/Instagram/TikTok ads for small businesses. It is on the USA page so an SMB buyer is not forced to shortlist a global AOR. Sean Standberry, Sherman Standberry, and Keran Smith are the founding story. This is not Dunkin’. This is a local or regional ads retainer, honestly labelled. US proof is Atlanta, 2011, three founders, a 60-person independent built for small-business social ads. No named national creator campaigns in the materials reviewed. Measurement is ads-manager reporting. Against IZEA, SMB retainer versus public marketplace. Against The Influencer Marketing Factory, local ads versus global named work. It is on the USA page so an SMB brief has an honest US analog.
Skip if. Skip if the US brief is enterprise creator, partner badges, or named national campaigns.
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