Keith's note: I sent the following email request to Glenn Delgado, AA for NASA's Office of Small Business Programs (OSBP): "I found this tweet to be very interesting. Can you provide me with a list of the specific 800+ small business companies that are contributing to SLS, where they are located, and what their products/services are in relation to SLS? People often do not appreciate just how pervasive NASA programs are in terms of procurement. Moreover it is often not appreciated how deeply these programs can reach into small communities a great distance from the cities/states where space activities are usually associated."
Keith's update: No response from Glenn Delgado or NASA PAO but this tweet from @NASA_OSBP just appeared. Impressive report (download). Too bad NASA PAO hasn't issued a press release about it. Oddly the Coalition for Deep Space Exploration, a pro-SLS/Orion lobbying group, has made no mention at all about it.