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S-1/A are extremely common. I can't recall an IPO without one. There were 8 of them filed today alone.

Thanks for that link. I wasn’t familiar with EDGAR enough to know you can sort by latest fillings. Really helpful.

EDGAR's own search facilities are fairly poor. I mirror and index it in Lucene for my own purposes.

Do you offer that on a public facing website?

Not sure I have the budget for that :-) . I've often thought it could make a decent business offering though.