Gerdau (GGB) Surges 6.1%: Is This an Indication of Further Gains? Posted byZacks Equity Research September 24, 2021 Leave a comment on Gerdau (GGB) Surges 6.1%: Is This an Indication of Further Gains? Gerdau (GGB) saw its shares surge in the last session with trading volume being higher than average. The latest trend in earnings estimate revisions m…