David A. Duffield has filed 459 Form 4 transactions, all in a single company: Workday (WDAY). The pattern is entirely one-directional. His total sell value across all filings is $1,076,567,330.12, with zero open-market purchases and zero acquisitions. The recent activity, spanning October 1 through October 9, 2026, contains 23 sell transactions and no buys.
The selling is concentrated and heavy. On October 1 alone, Duffield executed 12 sales totaling roughly $18.4 million, with individual trades ranging from $115,354.02 to $9,137,546.19. On October 6, he sold six blocks worth about $18.6 million, including a single $8,583,244.68 disposition. The largest day came on October 9, with six sales totaling approximately $18.2 million, led by an $8,685,731.79 trade. Each of those three dates also included a conversion of derivative securities (code C) valued at zero, which typically accompanies option exercises that feed the subsequent sales.
The dollar figures are large, but the structure is routine for a founder or major holder. Sales are spread across multiple lots per day, which suggests systematic liquidation rather than a single block trade. There are no code P transactions, meaning Duffield has not bought shares on the open market in this window. The absence of any acquisition activity, combined with the steady stream of sales, gives the filing history a clear sell bias. The most recent trades, dated October 9, 2026, continue that pattern without interruption.
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