I’m Riley Rosebee, the founder of Marble Institute of Technology and the builder of Marble Tower.
Data intelligence for the future of transportation. We turn public records into a clear picture of how transportation is changing.
Marble Institute of Technology is tracking the transformation of transportation, starting with the sky. Marble Tower is how we do it: nearly every version of the U.S. aircraft registry since August 2023, mapped to the companies behind it.
I was born and raised in Colorado, and I am based in the Roaring Fork Valley. I have spent a decade in markets, and I hold a Series 65 license.
The institute is one person. One laptop. AI. It is named for Marble, Colorado, a town in the heart of the Rockies with no gas station and one restaurant. I build in public from here.
The registry overwrites itself. I keep nearly every version since August 2023. Marble Tower captures the U.S. aircraft registry five days a week and maps every aircraft to the company and ticker behind it. Our own capture starts March 19, 2026, and the archive holds three years of registry history. The file dated November 6, 2026 lists 318,466 aircraft records. 5,942 companies are mapped.
Here is why that matters. Zipline is private and publishes no fleet count. The registry does. Zipline added 429 certificated aircraft in the month before its Uber deal: certificate dates July 17, 2026 to August 16, 2026, every registrant whose name begins ZIPLINE. The registry shows each one, with its date.
Marble Tower is built from public records only. Companies, not people. It is data and research, not investment advice.
I write the The Manifest, my notes on the Aerial Economy, and I host Founders + Friends, conversations with the people building the future of transportation. 40 posts and 8 episodes so far. I also publish the Logbook, a free monthly report on the aerial economy, built on Marble Tower’s data.
Find me on X (opens in a new tab) and LinkedIn (opens in a new tab). To talk about the data, book 15 minutes (opens in a new tab).