Built for founders who know the stack.

If you are building AI infrastructure for media, entertainment, or advertising, we want to hear from you. Hallstone was built by operators to back operators.

What You Get

Hallstone's LP network of approximately 70 senior operators and technology leaders is an active resource for the founders we back.

Our LPs include senior technology leaders from

Buyer Introductions

Direct access to decision-makers who control budgets and procurement at platforms, networks, and agencies.

Workflow Validation

LPs who have run the workflows you are trying to improve. They know what works, what breaks, and what gets adopted.

Faster Time-to-Pilot

Warm paths into design partnerships and pilot programs that cold outbound would take months to build.

Sharper Diligence

We evaluate your product the way a buyer would, not the way a generalist investor would. That means better questions and more useful feedback.

Founder-Market Fit Comes First

The single most important signal in our diligence is whether the founder has the domain expertise to execute in a market that is changing faster than anyone can predict.

Understanding the buyer, the workflow, and the industry reality is what translates into the ability to ship, adapt, and sell when the ground is shifting. We back founders whose domain depth gives them an execution advantage that generalist teams cannot replicate.

Are We a Fit?

Check what applies to your company.

You have deep domain expertise in media, entertainment, or advertising
You can name the buyer type and their budget line
Your product integrates into toolchains already in use
You have workflow lock-in or real switching costs
You have proprietary data that compounds over time
You can show measurable ROI for your buyer
Your TAM extends beyond media as a beachhead

What Gets Us to Pass

These are not negotiable.

✕LLM wrapper without a proprietary moat
✕Unclear buyer or budget owner
✕Services business without a credible software path
✕Unmanaged IP, rights, or consent risk
✕Structurally narrow TAM with no expansion path

Our Process

Origin Story

First call is about you, not the deck. We want to understand how you got here, what you’ve learned that others haven’t, and why you are the person to build this.

Deep Dive

If there is mutual fit, we go deep: product, buyer, workflow integration, unit economics, data posture, competitive landscape.

Partner Decision

Investment decisions are made by the partners with input from our LP network where relevant. We move quickly and give direct answers.

Community Initiative

Two Ways to Engage with Hallstone

Some founders come to Hallstone for investment review. Others come looking for operator perspective on a specific challenge. Both can be valuable relationships.

Submit Your Company

For companies that fit Hallstone's investment mandate and want to be considered for review.

Submit Your Company

Request Expert Support

For AI + MediaTech builders seeking double-opt-in introductions to experienced Hallstone community professionals for practical operating support.

Separate from submitting your company for investment review.

Inquire About Expert Support