// Define header once
var header = doc.CreateFormXObject(612, 35);
header.FillRectangle(0, 0, 612, 35,
    new PdfDrawOptions {
        FillColor = new PdfColor(0.12, 0.25, 0.55)
    });
header.AddText("COMPANY REPORT", 72, 10,
    new PdfTextOptions {
        Font = StandardFont.HelveticaBold,
        FontSize = 10,
        Color = new PdfColor(1, 1, 1)
    });

// Use on every page (artifact)
for (int i = 0; i < 10; i++)
{
    var page = doc.AddPage();
    page.BeginArtifact(PdfArtifactType.Pagination);
    page.AddFormXObject(header, 0, 757);
    page.EndArtifact();

    // ... add tagged content ...
}