Stop guessing.
Start growing.
Fish River is a performance marketing partner fusing decision intelligence, algorithmic reverse-engineering, and elite creative. We pair our proprietary River OS with rigorous incrementality testing to prove net-profit impact — so you scale with confidence, not hope.
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Industries served
Experience
Senior operators, not account managers in training.
Every engagement is led by practitioners who’ve managed nine-figure budgets across search, social, and programmatic — Fortune 100 to SMB, awareness to ecommerce and lead gen. We then train our proprietary River OS AI on that same senior intelligence, so every output is expert-grade — maximizing ROI while offsetting cost. You get the people who built the playbooks, plus AI that thinks like them.
Meet the team →
SIGNALS IN
Creative
Media
Website
Client
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Creative
AGENT
Media
AGENT
Website
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Client
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THE RIVER OS · agents run in concert
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Validated creative & decisions
PROVEN BY INCREMENTALITY
The River OS
Our proprietary growth engine.
The River OS is the system that powers our edge: an agentic core with 133 trainable skills, trained on platform behavior, audience signals, and your historical learnings. It reverse-engineers algorithmic opportunity, accelerates creative from brief to live, and evolves weekly. Senior operators approve everything it ships.
Explore the engine →
Tech Stack
Best-in-class tools.
One agentic brain.
Here’s a real point of difference: we don’t make you choose between proprietary tech and proven platforms. We wire your first-party stack and our third-party arsenal into The River OS, an agentic core with 133 trainable skills that evolves weekly.
Your stack and our arsenal flow in continuously. The River OS reasons over it and returns planning, optimizations, and measurement. Approved by senior operators, always.
See the full stack & how it pipes into The River OS →
Services Overview
The same disciplines —
run a different way.
It's not the list of services that sets us apart; it's how we run each one. Every lever is treated as an experiment and held to proven, incremental profit.
Paid Media
Run as a lab — we bid to profit, prove lift with geo-holdouts, and cut what isn't incremental.
Creative
Built to feed the algorithm — modular, River OS-driven, fatigue-proof, and yours to keep.
Website
Found by Google, cited by AI. AEO (SEO + GEO), CRO, and pages built to convert.
Measurement
Causation over correlation — incrementality, LTV, and MMM with Recast & Measured.
Client Results
A sample of anonymized outcomes across eCommerce, CPG, and professional services. Every figure comes from an account we run.
Amazon • eCommerce
+300%
Revenue growth after rebuilding their toughest category: structure, reviews, and product pages, with spend tripled at higher ROAS.
CPG • Supplements
−50%
Reduction in customer acquisition cost from persona-driven creative and product pages rebuilt around clinician trust.
Legal • Lead Gen
−80%
Reduction in cost per qualified lead with hyper-local media and offline conversions tied to signed cases.
See the work →
Ways to Engage
However you start, you'll see how we think before you ever sign a long-term deal.
01
Account Audit
We pressure-test your current accounts and show exactly where wasted spend and untapped incremental upside are hiding — with a clear plan to capture it.
02
Head-to-Head Bakeoff
Run us against your current setup or another agency on a defined test. Let validated, incremental results decide — not the pitch deck.
03
Pitch
Bring us your brief and goals. We'll come back with a tailored, full-funnel strategy and the first experiments we'd run to move your business.
Ready to prove what your marketing is really worth?
Get a free 30-minute strategy session to pressure-test your current spend and map the fastest path to validated growth.
Book Your Strategy Call
