144 0001734563 XXXXXXXX LIVE 0001467623 DROPBOX INC 001-38434 50 Hawthorne Street San Francisco CA 94105 4159307766 ANDREW HOUSTON REVOCABLE TRUST Director Officer 10% Stockholder Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

29500 1013620.00 150561680 10/12/2026 NASDAQ Common 06/25/2007 Founders Shares Issuer N 29500 06/25/2007 N/A N 10b5-1 Sales for THE ANDREW HOUSTON REVOCABLE TRUST

50 Hawthorne Street San Francisco CA 94105

Common 10/01/2026 354300 12049815.22 10b5-1 Sales for THE ANDREW HOUSTON REVOCABLE TRUST

50 Hawthorne Street San Francisco CA 94105

Common 09/10/2026 383800 13439235.51 Sales that were executed on October 12, 2026 are being reported on this Form 144 filed on October 13, 2026 given the EDGAR system was not accepting filings on October 12, 2026 in observance of the federal holiday. 10/12/2026 06/11/2026 /s/ Andrew Houston