A Rule of 40 heatmap by quarter from Q3 2023 to Q4 2025 for Formlabs, 3D Systems, and Stratasys. Formlabs climbs from negative scores into the green 25 to 49 percent range, while 3D Systems stays deeply negative and Stratasys hovers near zero.

Does the Rule of 40 Work for Hardware?

I've written about the Rule of 40 since 2015, and it's now gospel in SaaS. Does it mean anything for a company that makes physical things? Yes - but you have to read the curve, not the snapshot.

June 15, 2026 · 5 min · Brad Feld

The Premise: The Lead User and the Machines That Build Machines

Eric von Hippel taught me that innovation comes from users, not manufacturers. My premise: all future end-user software innovation will come from the user, and the machines will build it.

May 29, 2026 · 5 min · Brad Feld

Give First, Build Right with Eric Ries

On April 29 at 10am PT, Eric Ries and I are doing a free fireside chat for startup communities. We're going to talk about the lessons we've learned as founders, investors, and advisors - and the books we've each just put into the world.

April 20, 2026 · 2 min · Brad Feld

A Call for Founder Voices for an MIT Study on Entrepreneurial Ethics

I’m helping MIT (Fiona Murray and Alon Shklarek) share a short survey exploring how founders around the world navigate ethical challenges. Insights will shape practical tools for entrepreneurs, invest

September 7, 2025 · 1 min · Brad Feld

Turn Every Page

I learned how to do deals from Len Fassler. Last week, I got an email from Dustin Kloempken, who sent me a few quotes he wrote down from the Berkshire

May 19, 2025 · 3 min · Brad Feld

It's Not A Failure – It's Steps to Success

I’m not a sports fan, but wow, this is good.

April 28, 2023 · 1 min · Brad Feld

Leading Through Crisis: 96 hours after the fall of SVB

On Tuesday, David Cohen (Techstars co-founder/chair) and I did an AMA for Techstars founders about the SVB crisis. The team at Techstars turned it into a podcast for our Give

March 16, 2023 · 1 min · Brad Feld

Gluecon 13: 2023

GlueCon will occur for the thirteenth time, on May 24th-25th, in Broomfield, Colorado. My Foundry partners and I helped Kim and Eric Norlin create Gluecon in 2009 because we saw the need

March 6, 2023 · 2 min · Brad Feld

What Just Happened

For those of you older than 40, it sort of felt like 2000. If you are younger than 40, a massive tech bubble just burst. I expect you know that.

January 2, 2023 · 3 min · Brad Feld

Book: Startup Boards, 2nd Edition Is Available

The 2nd Edition of my book Startup Boards: A Field Guide to Building and Leading an Effective Board of Directors launched today. My co-authors, Matt Blumberg, the CEO of Bolster,

June 15, 2022 · 1 min · Brad Feld