Koester Jennifer 4

4 · Sphere Entertainment Co. · Filed Mar 17, 2026

AI-generated summary of this filing

Updated Mar 17, 2026

Sphere (SPHR) President Jennifer Koester Receives RSUs; Tax Withheld

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.

Form 4

Period: 2026-03-13

President & COO, Sphere

Transactions

Exercise/Conversion
Class A Common Stock
[F1]
2026-03-13+17,254→ 39,726 total
Tax Payment
Class A Common Stock
[F2]
2026-03-13$105.70/sh−8,808$931,006→ 30,918 total
Exercise/Conversion
Restricted Stock Units
[F1]
2026-03-13−17,254→ 34,509 total
Exp: 2028-03-15→ Class A Common Stock (17,254 underlying)

Footnotes (2)

[F1]Each restricted stock unit ("RSU") was granted on March 12, 2025 under the Sphere Entertainment Co. ("SPHR") 2020 Employee Stock Plan, as amended and represents a right to receive one share of Class A Common Stock or the cash equivalent thereof. One-third of the RSUs vested and were settled on March 13, 2026. One-third of the RSUs are scheduled to vest and settle on March 15, 2027. The remaining one-third of the RSUs are scheduled to vest and settle on March 15, 2028.
[F2]Represents RSUs of SPHR withheld to satisfy tax withholding obligations in connection with the vesting and settlement of RSUs described in footnote 1, exempt under Rule 16b-3.

Signature

/s/ Mark C. Cresitello, Attorney-in-Fact for Jennifer Koester|2026-03-17

1 file