Font Juan 4

What Happened

• Juan Font, SVP and President & CEO of CoreSite (an AMT business), was granted 8,060 restricted stock units (RSUs) on 2026-03-10 (report filed 2026-03-12). In connection with RSU vesting, 2,762 shares were delivered to the issuer to satisfy withholding tax obligations: 1,834 shares on 2026-03-10 at $186.12 each ($341,344) and 928 shares on 2026-03-11 at $182.85 each ($169,685). The withheld shares total $511,029. The RSU grant is recorded at $0.00 per share (award).

Key Details

• Transaction dates and amounts:
  • 2026-03-10: Grant of 8,060 RSUs (code A) — 8,060 shares acquired (award) @ $0.00.
  • 2026-03-10: 1,834 shares delivered to issuer for tax withholding (code F) @ $186.12 = $341,344.
  • 2026-03-11: 928 shares delivered to issuer for tax withholding (code F) @ $182.85 = $169,685.
• Total shares withheld for taxes: 2,762; total value ≈ $511,029.
• Shares owned after the reported transactions: not specified in the filing.
• Footnotes:
  • F1: The RSUs were granted under AMT’s 2007 Equity Incentive Plan and vest one‑third annually over three years, beginning one year from grant; each RSU converts to one share.
  • F2: Shares were delivered to the issuer to pay withholding taxes upon RSU vesting.
• Filing timeliness: Reported on 2026-03-12 for transactions dated 2026-03-10/03-11 — appears timely under Section 16 reporting rules.

Context

• These entries reflect an equity award (acquisition of RSUs) and routine tax withholding on vested RSUs, not an open-market sale. Withholding of shares to cover taxes is common and should not be interpreted as a market sale signal. The RSU grant aligns the executive with shareholder value over the vesting period but does not represent a cash purchase by the insider.