Found this on Oneplus site

[prabhat_F62]

Does it mean oneplus smartphones are made by oppo ?

What you guys think ?

[Arman-IND]

Yes one plus oppo realme vivo all are from BBK ELECTRONICS

[DarshanChatterjee]

No. Not directly. Actually Oppo , vivo , realme , OnePlus, Iqooo all belongs to their parent company BBK electronics. Now oppo has the largest stake of OnePlus brand.
And for an easy example: Suppose you and your brother open 2 stores of same thing. But you run your store in a different region. Now you came to another city for business purpose ,where your brother's store is. And you ran out of some parts. So you'll go to your brother's store for it.
That's how it works. 😂 😂

[SomeshBohidar]

Off course parent company of oneplus is oppo

[yoyoblikucingh]

Obviously 🙄🙄

[Venkat9377]

Upcoming oneplus devices got OPPO's color OS....

[prabhat_F62]

For real ??