As a company grows, founders can't know everyone. The key to preserving culture is not maintaining personal relationships but ensuring early, influential employees don't become political gatekeepers. Be ruthless in removing those who play for themselves, not the company.

Dario Amodei states that at Anthropic's scale (2,500 people), his most leveraged role is not direct technical oversight but maintaining culture. He achieves this through intense, direct communication, including a bi-weekly, hour-long, unfiltered address to the entire company to ensure everyone remains aligned on the mission and strategy.

In company-wide town halls, the CEO deliberately spoke about creative successes, risks taken, and the creators behind the work. He almost never discussed financial results, cementing the message that creativity, not profit, was the company's primary value.

Contrary to common belief, WCM's culture became stronger as it grew to 100 employees. This was achieved by having leaders and a Chief Culture Officer who constantly model key behaviors. This creates a self-replicating effect that scales more effectively than top-down systems or processes.

Jade Biosciences grew from 0 to 70 employees virtually in under a year. To manage this, leadership intentionally defined core values like "advance what matters" through company-wide sessions. This proactive approach ensures alignment and a strong identity in a remote-first, high-growth environment, moving beyond just 'what' is done to 'how' it is done.

A biotech transitioning from a small, 'fit-for-purpose' R&D team to a large commercial organization gets a rare chance to create a new culture. Madrigal treated its rapid growth from ~100 to over 500 people as an opportunity to establish fresh core values for the newly-formed enterprise.

David Cohen of Techstars highlights how SendGrid's culture scaled beyond its founder. The company's '4-H' values were so deeply embedded that two subsequent CEOs had to adopt and live by them. This deliberate continuation of core values was key to maintaining a cohesive team through an IPO.

The only formal dress code was 'no frontal nudity.' This simple, humorous rule was a powerful signal that the company valued a casual, creative, and anti-corporate environment, which helped attract and retain the right kind of talent for its mission.

Your culture isn't what's on the walls; it's defined by the worst behavior you allow. Firing a high-performing but toxic employee sends a more powerful message about your values than any mission statement. Upholding standards for everyone, especially top talent, is non-negotiable for a strong culture.