Check out the companies making headlines before the bell: Quantum stocks — Quantum stocks tumbled on Monday morning, following comments from Mark Zuckerberg echoing Nvidia CEO Jensen Huang that quantum is at least a decade away from being a “useful paradigm.” Zuckerberg made the comments on a Friday episode of the “Joe Rogan Experience.” Shares of Rigetti Computing fell 25% and D-Wave Quantum tumbled around 16%, followed by an 8% decline in IonQ and a 9% slide in Quantum Computing . Managed care stocks — Managed care stocks rose after the U.S. government proposed on Friday an average total increase of 4.3% to its 2026 reimbursement rates for Medicare Advantage plans. Shares of Humana rose almost 6%, while UnitedHealth and CVS Health each added 3%. Boot Barn — The boot retailer popped about 4% after Boot Barn guided for third-quarter earnings per share of around $2.43 on Friday afternoon, higher than the $2.05 analysts polled by FactSet had previously expected. The company’s expected revenue of $608.2 million also came above the prior consensus of $593.4 million. Pinterest — Shares of the visual sharing platform slid 3% in the wake of Jefferies’ downgrade to hold. Jefferies also called the company’s growth “underwhelming” and lowered its forecasts for revenue and EBITDA in the 2025 fiscal year. Crypto stocks — Stocks tied to the price of bitcoin were lower as the cryptocurrency slid to about $90,000. Coinbase and MicroStrategy fell 4% each in premarket trading. The bitcoin miner Mara Holdings lost 4% and Core Scientific retreated by 3%. Lululemon — Shares of the apparel company rose more than 3% after a holiday sales update showed strong demand . Lululemon raised its guidance for sales and earnings per share for the fourth quarter. The company also said it expects gross margin to expand year over year, while previous guidance called for the margin to narrow. Macy’s — Shares fell 2% after Macy’s issued a lackluster update to its fourth-quarter guidance . Revenue is expected to come in slightly below or at the lower end of previous guidance of $7.8 billion to $8.0 billion. Comparable sales are expected to be roughly flat quarter to date, compared with the consensus estimate of a 0.4% rise, according to FactSet. Abercrombie & Fitch — Shares of the clothing retailer plunged 11% in premarket trading even after Abercrombie raised its outlook for the fourth quarter on strong holiday sales expectations. The company now expects fourth-quarter net sales to grow between 7% and 8%, compared with previous guidance of 5% to 7% growth. Those holiday expectations are still lower than the year-ago period, however, suggesting a slowdown in growth. Howard Hughes Holdings — Shares of the real estate developer jumped 9% after Bill Ackman’s Pershing Square proposed a deal to form a new entity to merge with the real estate company, offering current holders $85 a share. Megacap tech stocks — Megacap tech stocks tumbled on Monday morning as U.S. Treasury yields rose, adding upon their losses from last week. Nvidia , Tesla and Palantir Technologies each lost around 3%, while Broadcom and Micron Technology shed approximately 2%. Moderna — The biotech firm plunged 20% after lowering its 2025 sales guidance by about $1 billion, citing potential headwinds in 2025. Moderna now expects this year’s revenue to fall between $1.5 billion and $2.5 billion, with the majority coming in the second half of the year. Intra-Cellular Therapies — The stock soared nearly 34% after Johnson & Johnson announced it will take over the neurological treatment company for $132 per share. That values Intra-Cellular Therapies at $14.6 billion. Shares of Johnson & Johnson were flat. — CNBC’s Michelle Fox, Alex Harring, Yun Li, Tanaya Macheel, Sarah Min, Jesse Pound and Pia Singh contributed reporting.