Robert H. Niehaus

Companies

• Zeta GlobalBoard member Jun 9, 2021 to now¹
• Iridium CommunicationsBoard member Feb 14, 2008 to now²
• Heartland Payment SystemsBoard member Mar 8, 2006 to Apr 27, 2016³
• GREENHILL & CO INCChair Jan 31, 2008 to Feb 4, 2010⁴
• Iridium CommunicationsSenior Vice President Feb 14, 2008 to Sep 2, 2009²
• GREENHILL & CO INCChrmn, Greenhill Cap Ptners LP Jan 27, 2006 to Aug 5, 2009⁵
• Crown Castle International Corp.Board member Jan 22, 2007 to Mar 14, 2007⁶

Holdings

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

Shares held

• Zeta Global ZETA671,772 shares⁷$21.9M at $32.59Jul 1, 2026
• Iridium Communications IRDM266,910 shares⁸$11.8M at $44.21Aug 17, 2026

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

Recent filings

• Aug 17, 2026Gift 50,000 shares of Iridium Communications⁸
• Jul 1, 2026Granted 7,197 shares of Zeta Global⁷
• Jun 30, 2026Granted 378 shares of Iridium Communications⁹
• May 7, 2026Gift 60,000 shares of Zeta Global¹⁰
• May 7, 2026Gift 60,000 shares of Zeta Global¹⁰
• Mar 31, 2026Granted 743 shares of Iridium Communications¹¹
• Jan 6, 2026Granted 17,315 shares of Iridium Communications¹²
• Dec 31, 2025Granted 1,112 shares of Iridium Communications¹²
• Nov 12, 2025Other 346,110 shares of Zeta Global¹⁰
• Oct 28, 2025Bought 30,000 shares at $17.49 of Iridium Communications¹³
• Sep 30, 2025Granted 1,097 shares of Iridium Communications¹⁴
• Jul 1, 2025Granted 9,907 shares of Zeta Global¹⁵
• Jun 30, 2025Granted 590 shares of Iridium Communications¹⁶
• Mar 31, 2025Granted 648 shares of Iridium Communications¹⁷
• Jan 6, 2025Granted 2,984 shares at $30.15 of Iridium Communications¹⁸
• Jan 6, 2025Granted 6,633 shares of Iridium Communications¹⁸
• Dec 31, 2024Granted 586 shares of Iridium Communications¹⁹
• Nov 18, 2024Bought 30,000 shares at $18.62 of Zeta Global²⁰
• Oct 23, 2024Sold 38,355 shares at $29.39 of Iridium Communications²¹
• Oct 23, 2024Exercised options 38,355 shares at $9.18 of Iridium Communications²¹
• Sep 30, 2024Granted 556 shares of Iridium Communications²²
• Aug 8, 2024Other 217,625 shares of Zeta Global²³
• Jul 1, 2024Granted 8,241 shares of Zeta Global²⁴
• Jun 28, 2024Granted 632 shares of Iridium Communications²⁵
• Mar 29, 2024Granted 596 shares of Iridium Communications²⁶