At 4% royalties, 60% conversion rate and $5.5B in sales for Darzalex, Halo would get around $130M for 2021, which may be barely enough to meet the guidance of approximately $180M from all products. Stock action suggests market thinks we will do better. I do think conversion rate should be around 80% by the end of the year.
If I am right and Darzalex sales are $7B next year, royalties will be $224M at 4% and $280M at 5%. I think this is what the market is excited about.