Publications Memos Go Back SEC Amends Issuer Common Stock Repurchase Safe Harbor 12.19.03 This memo explains the SEC amendments to Rule 10b-18 which provides a limited safe harbor from claims of market manipulation in the context of issuers repurchasing their own common stock. Related Insights 07.15.26 | Publications Simpson Thacher Sustainability and ESG: Regulatory Update – July 2026 07.10.26 | Publications The Ad Standard: Monthly Update - July 2026 07.02.26 | Publications SEC Watch: Monthly Takeaways for Asset Managers - July 2026 Related Services Related Practice Areas Corporate Capital Markets Debt