If you are confident about the prediction, then maybe you want to say so plainly.

We are confident that XYZ corp will continue to see an increase in sales in the next quarter.

If you know for certain then you could say that too.

We are certain that XYZ corp will continue to see an increase in sales in the next quarter.

Somewhat more flowery, possibly a little softer:

We have no doubt that XYZ corp will continue to see an increase in sales in the next quarter.

Somewhat more stern:

We are firm that XYZ corp will continue to see an increase in sales in the next quarter.

 

or

 

We are firm on XYZ corp continuing to see an increase in sales in the next quarter.

If you are confident about the prediction, then maybe you want to say so plainly.

We are confident that XYZ corp will continue to see an increase in sales in the next quarter.

If you know for certain then you could say that too.

We are certain that XYZ corp will continue to see an increase in sales in the next quarter.

Somewhat more flowery, possibly a little softer:

We have no doubt that XYZ corp will continue to see an increase in sales in the next quarter.

Somewhat more stern:

We are firm that XYZ corp will continue to see an increase in sales in the next quarter.

or

We are firm on XYZ corp continuing to see an increase in sales in the next quarter.