The reiteration of a 'Buy' rating by a reputable analyst like Alex Henderson from Needham is a positive signal for Okta. It indicates that the analyst believes the company's stock is expected to outperform the market or its sector in the short term. The maintained price target of $100 also suggests that the analyst sees potential for the stock's price to reach this level. This could lead to increased investor confidence and potentially a short-term increase in the stock's price.