The Container Store created a poison pill earlier this month after a stockholder racked up hundreds of thousands of shares.

Now, the same investor has walked away from the retailer as the Coppell-based company grapples with slowing sales, according to regulatory filings.

Amit Agarwal of Florida owned about 18% of shares by Oct. 7, up from nearly 13% in September. The holding would reach 19% in less than two weeks. Yet that fell to less than 10%, a filing said on Wednesday and 0% Thursday.

Amid Agarwal’s rising share count, the Container Store adopted a limited duration stockholder rights plan, or what’s often called a poison pill. The move was in response “to the rapid and significant accumulation” of the stock by a single stockholder — and to protect value for all of its shareholders, according to a statement.

The Container Store is under pressure. It reported this week comparable same-store sales dropped 12.5% in the previous quarter from the year-ago period. Shares, which closed at $5.24 on Thursday, are down more than 40% in the past month.

Still, earlier this month, a new deal was unveiled in which Beyond — owner of Bed Bath & Beyond, Overstock, Zulily, and other online retail brands — would invest $40 million in The Container Store through a preferred equity transaction.

With the deal, Beyond will get preferred stock that would convert to common stock at a price of $17.25, which would result in ownership of approximately 40% of The Container Store common equity.