Top Stock Market Losers on October 19, 2026

• Iambic Therapeutics (NASDAQ: IAM) fell sharply after its recent IPO but remained slightly above its $16.00 offering price.

• TCGX Acquisition (NASDAQ: TCGX) declined after announcing a business combination with TriGemX Bio.

• Cable One (NYSE: CABO) remained under pressure amid litigation affecting its planned Mega Broadband acquisition.

The reported stock market losers on October 19, 2026, included Iambic Therapeutics (NASDAQ: IAM), TCGX Acquisition (NASDAQ: TCGX), Cable One (NYSE: CABO), Hudson Pacific Properties (NYSE: HPP) and Almonty Industries (NASDAQ: ALM).

Iambic Therapeutics (NASDAQ: IAM) fell 31.4% to $16.34. Despite the decline, the shares remained $0.34, or approximately 2.1%, above the company's $16.00 IPO price. Iambic raised about $150.00 million by selling 9.375 million shares.

TCGX Acquisition (NASDAQ: TCGX) declined 18.5% to $10.02 on approximately 1.79 million shares. The move coincided with its announcement of a merger with migraine-drug developer TriGemX Bio. The transaction is expected to provide approximately $246.00 million in gross proceeds, assuming no shareholder redemptions.

Cable One (NYSE: CABO) dropped 14.0% to $6.22. A federal judge temporarily blocked its approximately $480.00 million purchase of the remaining 55% of Mega Broadband Investments after lender CoBank challenged the transaction and its financing.

Hudson Pacific Properties (NYSE: HPP) lost 12.4% to $9.02. The company sold its Skyport Plaza office property for $75.50 million and completed another sale related to its Quixote operations. It plans to use the proceeds to reduce its revolving credit balance.

Almonty Industries (NASDAQ: ALM) fell 10.2% to $8.83 on approximately 12.2 million shares. The tungsten producer held an investor day that included market and operational updates, but no specific announcement clearly explains the decline.