How to Build a Whitespace Matrix for an Existing Account.
You are preparing for a quarterly account review or planning session and want to find expansion before the customer brings it up
Most AMs know their biggest accounts well but still miss expansion because they think about what they have sold, not where the customer could buy. A whitespace matrix forces you to look at every buying center against every capability you offer. That shift in perspective is where the gaps appear.
Where it goes wrong
Without a structured view, you default to selling more of what you already sold to the same people. You miss whole business units, regions, or use cases until a competitor finds them first.
What you'll be able to do
You can build a simple matrix per account that shows active, competitive, and unknown cells, and triage which gaps are worth pursuing
How to do it
List your rows
List your rows: every product, module, or capability you can credibly sell into this account.
List your columns
List your columns: every buying center that makes semi-independent decisions - business units, regions, functions, plants.
Fill each cell with a status
Fill each cell with a status: Active, Past, Competitive, Unknown, or Not relevant. Pull from CRM, contracts, and usage data first.
For every empty or Unknown cell, ask three questions
For every empty or Unknown cell, ask three questions: Is there a real buying center here? Is the need relevant to their work? Is the budget meaningful enough to pursue?
Mark each gap as Pursue, Park, or Pass
Mark each gap as Pursue, Park, or Pass. Every Pursue cell needs an owner and a one-line thesis: who would buy, why now, what outcome they get.
Note where competitors already sit inside the account
Note where competitors already sit inside the account. Those cells matter as much as the blank ones.
See the difference
The AM reviews the account and notes they have not sold the analytics module yet. They add it to the next QBR agenda without knowing which team would use it or why.
The AM builds a matrix with five buying centers across two regions. Three cells come back Unknown for the operations team in the northern region. She checks CRM, finds no prior contact there, and marks two cells Pursue with the thesis: ops director is running a cost-reduction initiative and two similar accounts use the workflow module to cut manual reporting by half. She books a discovery call before the QBR.
You can build a simple matrix per account that shows active, competitive, and unknown cells, and triage which gaps are worth pursuing
How you'll know it's working
You have got it when every strategic account has a matrix you can open in two minutes, every Pursue cell has a named owner and a thesis, and you review it at least once a quarter
Questions people ask
How do you build a whitespace matrix for an existing account?
Most AMs know their biggest accounts well but still miss expansion because they think about what they have sold, not where the customer could buy. A whitespace matrix forces you to look at every buying center against every capability you offer. You can build a simple matrix per account that shows active, competitive, and unknown cells, and triage which gaps are worth pursuing
What is the most common mistake to avoid?
Without a structured view, you default to selling more of what you already sold to the same people. You miss whole business units, regions, or use cases until a competitor finds them first.
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