Anterix (ATEX) CMO Martin Heather Sells 11,529 Shares

What Happened
Martin Heather, Chief Marketing Officer and Chief of Staff at Anterix (ATEX), disposed of a total of 11,529 shares in two actions tied to restricted stock unit (RSU) settlement and an open-market sale. On 2026-09-09, 3,465 shares were withheld by the issuer to satisfy tax withholding obligations at $85.44 per share (value ~$296,050). On 2026-09-10, Heather sold 8,064 shares in the open market at a weighted average price of $84.20 per share (proceeds ~$678,998). Combined proceeds/values are approximately $975,048. These are sales (routine and tax-related) rather than purchases.

Key Details

• Transaction dates: 2026-09-09 (withholding) and 2026-09-10 (open-market sale). Form 4 filed 2026-09-11 (appears timely).
• Shares/values: 3,465 shares withheld @ $85.44 = $296,050; 8,064 shares sold @ weighted avg $84.20 = $678,998; total ~11,529 shares / ~$975,048.
• Shares owned after transaction: Not disclosed in the provided filing.
• Footnotes: F1 — shares were withheld by the issuer to satisfy tax withholding from partial vesting/settlement of RSUs. F2 — the $84.20 price is a weighted average; actual sale prices ranged from $84.468 to $84.00, and the reporting person will provide a breakdown on request.
• Filing status: Filed 2026-09-11 for transactions on 9/9 and 9/10; this filing appears to meet the usual two-business-day Form 4 timing requirements.

Context

• The 3,465-share disposition was a withholding of shares to cover tax obligations on vested RSUs (a routine, administratively driven transaction). The 8,064-share sale was an open-market sale (common liquidity activity).
• Sales are factual events and do not necessarily signal the insider’s view on company prospects; tax withholding is especially routine.