I've seen multiple hints that Panasonic is angling for a merger with Tesla. They did a very curious reorganization a while back, putting their entire worldwide battery business under their primary North American corporate entity -- and IIRC removing a bunch of other stuff (such as retail consumer product sales) from their North American corporate entity -- so that their North American corporate entity contains only products which Tesla might be interested in. This feels very much like angling for a merger. Both companies are relatively short on cash, so they may be aiming for a stock-for-stock merger of Panasonic's North American corporate entity with Tesla where Panasonic ends up with a hunk of Tesla stock.
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Thats an interesting thought that deserves some more attention I believe.
I do agree that there are a few good points that makes such a move a possibility.
Tesla has integrated suppliers or started their own development and production and got rid of suppliers where they felt they can do that business better, faster, cheaper or more reliable.
Better in the sense of they can produce that part(s) with better performance, cheaper and most important get rid of a dependency that may hinder them to ramp production or taking a unnecassary risk. In some areas that has been a set back for a while where it took a long time to catch up e.g. Mobileye/AP.
In other they just bought the company because it has been of strategy importance for their growth e.g. Groman. Or they thought they can develop a 10 times better performing sub system like Nvidia's chip more tailored to their requirements which is strategic for Tesla to win with AP. Often there has been a different point of view what is possible and the right approach and strategy and Elon has then either simply fired the owner (Groman) or the company Mobileye. Most suppliers Tesla stopped working with have not agreed to build a system that is just tailored to Teslas needs.
Panasonic has been a strategic supplier and if you will also investor because Tesla would not have been able to build Batteries in the required masses and with lower costs than the industry without a company that brings the knowledge, financial power and plays according to the Tesla rules.
Since Batteries and Battery packs are a constant constraint for EV and Powerwall (industry & private) output which in my view also limits Solar Panel output (the real beauty comes only with the combination of solar & battery) it would be more than logic for Tesla to at least consider integrating Battery production fully. Panasonics larger profit comes now from Tesla so why not taking that part in-house?
Tesla is a unique company in the way they approach vertical integration to bring margin in-house as well as keep control of critical supply for their products. Batteries are the only piece left in the supply chain that have a critical importance for the success of Tesla but are not fully controlled by them.
Having now a decent company size and with constant creation of +CF and profits Tesla could indeed start to eliminate that last risk of their business and bring it together.
If we turn it around and think about what Panasonic is providing that Tesla after years of working closely together with them cannot there is nothing that I would call essential. Other people may add here as I am not an expert.
Also its been interesting to watch that Tesla with regards to Asia and Europe never really committed to any Battery supplier but is pretty vague with whom they intend to work together.
In terms of the impact on the SP I believe a merger or takeover will be a mixed bag. Shorts will call it another strategic mistake and compare it to Solar and that Tesla even today did not manage to build that business but just wasted investments and never got a pay back. So it may create a major short attack and depress the SP.
Bulls will call it a strategic and important step for the future growth and another moat but investors did not listen before to that argumentation and proved to be short sighted. In my view they are still today.
The media will call it another large not required investment that will bring Tesla into a money burning modus again not listening to the fact that a share exchange deal will not have a negative impact on cash flow or profits.
In my view it makes business sense but I am not sure if I should wish them to do it now.