Since I haven't received answers to my questions, and I understand I never will, I did some research.
After Qualcomm's acquisition of Arduino, it is now "pretty clear" that the Arduino company no longer exists; Arduino has become a division of Qualcomm.
There is a huge difference between an Arduino that remained a legally independent company, even if its owner is Qualcomm, and an Arduino that was dissolved into Qualcomm.
My sources of legal and free information:
moneyhouse.ch
papers.ch
business-monitor.ch
There have been very old companies in the Arduino galaxy, such as Smart Project.
The oldest one I found with reliable information is:
BMCI
Founded in 2013, its activity: design, develop, manufacture, assemble, test, and distribute electronics.
Then, with the reconciliation that followed the Banzi vs. Musto civil war, there was:
Arduino SA
Two phases must be distinguished:
Phase 1
from June 27, 2018 to October 14 2025
Resumption of activities of BMCI and Arduino LLC (no information available; I am not aware of a papers.ch equivalent for the USA).
Phase 2
from October 14, 2025 to October 31, 2025 (only 17 days)
Change of activity, transformed into a financial asset management structure.
Currently:
Aurelia Sunset SA
Decision of October 31, 2025
Registered on: November 4, 2025
Resumption of the "new financial activities" of Arduino SA,
The board of directors remains unchanged from that of Arduino SA, with "former" Arduino (Banzi, Violente), a representative from ARM, one from Renesas, patent specialists, and investor representatives.
Therefore, unless I have missed some information, there is no longer a company with the name Arduino.
This is different from the equity investments of ARM and Renesas.
It is not known whether former Arduino employees hold positions of responsibility in the new structure.
Wait and see, or as Arduino is an italian project : Solo il tempo potrà dirlo.