Koester Jennifer 4

What Happened

• Jennifer Koester, President & COO of Sphere Entertainment Co. (SPHR), had 17,254 restricted stock units (RSUs convert/settle) on March 13, 2026. Of those shares, 8,808 were withheld to satisfy tax withholding at $105.70 per share (total $931,006). Net shares delivered to Koester were 8,446.

Key Details

• Transaction date: March 13, 2026.
• Converted/settled RSUs: 17,254 shares (transaction code M).
• Tax withholding: 8,808 shares withheld at $105.70/share = $931,006 (transaction code F).
• Net shares received by insider: 8,446 (17,254 − 8,808).
• Footnotes: RSUs were granted March 12, 2025 under SPHR’s 2020 Employee Stock Plan; one‑third vested/settled on March 13, 2026, with remaining tranches scheduled for March 15, 2027 and March 15, 2028. Withholding is exempt under Rule 16b-3 per the filing.
• Shares owned after the transaction: not specified in the filing.
• Filing date: March 17, 2026 — filed within the standard two business‑day window (timely).

Context

• This was an RSU vesting and settlement with a routine share‑withholding to cover tax obligations (a cashless withholding), not an open‑market sale or purchase. Such withholding is common and does not by itself indicate a buy/sell signal. Transaction codes: M = conversion/exercise of a derivative (RSU conversion), F = shares withheld for tax withholding.