Does anyone know who manufactures this piston? Thanks

Look like the old TRW/Speed-Pro L2295F pistons. Heavy, thick tops except under the valve notches.

https://www.manciniracing.com/440comdis191.html

X2. Trw/Speedpro. Mopar also sold them as D.C. or M.P. They give about 11.5 :1 compression with 906 heads.
It's going to be a little more with most aluminum heads.
I called Trw a looong time ago and asked about machining them to lower compression. They said I could safely take .090" out of the entire valve notch and the top of the dome. Don't try to take off the entire dome. Don't forget to round over the edges where you machine them. Rebalance as necessary.

Back in the 80s we would mill the dome off , mill the block .030 and run closed chambered heads. With the domes milled and a stock block they would sit about .050 in the hole. This way they turned out to be a stronger flat top piston than the 2266 or 2355. The 2295s had the skirt stiffeners and the small oil holes for lubrication, not the slots like the other two TRW pistons. Ran 10.77 in a full body Charger with those slugs.

One other note...... the valve pocket isn’t very generous.

If you plan of using a fairly long duration cam....... check the clearance.

Yep, that was the primary reason I called Trw. I needed to know how much I could take out of the notch for a big flat tappet. They threw in the info about the dome.

I had one scanned and 3D printed 1/2 of the top. The notch area was about .240" thick and under the dome was around .40" at the thinnest part. I think if you take off the whole dome you would end up around 9.5:1 compression ratio unless you have small chambers.

It had a 906 head on it milled .040 and a head gasket with compressed thickness of .039. The piston is out of the hole .010. It detonated like crazy. I want to go with a edelbrock closed aluminum head with 84cc chamber and head gasket of .051 so Ill have .041 quench. That should also lower my compression 1/2 a point to 11.5:1 with the dome. If I did the math right. The bore is 4.340 and it has a standard stroke. I am hoping to get buy with mixing 50/50 110 octane and 93 pump.