Haiyan Song

Companies

• Eos Energy Enterprises, Inc.Board member Jul 15, 2026 to now¹
• CSG SYSTEMS INTERNATIONAL INCBoard member Mar 6, 2020 to now²
• F5, Inc.EVP of Security Jan 6, 2021 to Feb 3, 2023³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• F5, Inc. FFIV6,460 shares⁴$2.9M at $456.14Feb 1, 2023
• EEEos Energy Enterprises, Inc. EOSE15,000 shares⁵$26.2K at $1.75Sep 14, 2026
• CSCSG SYSTEMS INTERNATIONAL INC0 shares⁶May 14, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Sep 14, 2026Bought 5,000 shares at $3.84 of Eos Energy Enterprises, Inc.⁵
• Sep 11, 2026Bought 10,000 shares at $3.95 of Eos Energy Enterprises, Inc.⁵
• May 14, 2026Returned to company 22,560 shares at $80.70 of CSG SYSTEMS INTERNATIONAL INC⁶
• Jun 10, 2025Granted 3,085 shares of CSG SYSTEMS INTERNATIONAL INC⁷
• Jun 10, 2024Granted 4,723 shares of CSG SYSTEMS INTERNATIONAL INC⁸
• Jun 10, 2023Granted 4,060 shares of CSG SYSTEMS INTERNATIONAL INC⁹
• Feb 1, 2023Shares withheld for tax 819 shares of F5, Inc.⁴
• Feb 1, 2023Exercised options 1,559 shares of F5, Inc.⁴
• Nov 1, 2022Shares withheld for tax 1,446 shares of F5, Inc.¹⁰
• Nov 1, 2022Exercised options 1,560 shares of F5, Inc.¹⁰
• Oct 31, 2022Granted 1,359 shares of F5, Inc.¹¹
• Aug 1, 2022Shares withheld for tax 772 shares of F5, Inc.¹²
• Aug 1, 2022Exercised options 1,559 shares of F5, Inc.¹²
• Jun 10, 2022Granted 2,924 shares of CSG SYSTEMS INTERNATIONAL INC¹³
• May 1, 2022Shares withheld for tax 773 shares of F5, Inc.¹⁴
• May 1, 2022Exercised options 1,560 shares of F5, Inc.¹⁴
• Apr 29, 2022Other 232 shares at $142.30 of F5, Inc.¹⁴
• Feb 1, 2022Shares withheld for tax 2,460 shares of F5, Inc.¹⁵
• Feb 1, 2022Exercised options 4,901 shares of F5, Inc.¹⁵