Panasonic invested $1.6B while the total project cost is about $5B.
E.g. here: <a href="http:&#x2F;&#x2F;mashable.com&#x2F;2016&#x2F;01&#x2F;16&#x2F;panasonic-tesla-gigafactory-investment" rel="nofollow">http:&#x2F;&#x2F;mashable.com&#x2F;2016&#x2F;01&#x2F;16&#x2F;panasonic-tesla-gigafactory-i...</a>
While 32% if significant share, it’s less then half.
I don’t see how the cells manufactured by a Tesla-branded factory, where TSLA owns more than 50% of the factory, aren’t Tesla’s own.