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Stock Market News 21 January 2026

Super Micro Computer (SMCI) stock slides as Wall Street selloff bites — what to watch next

Super Micro Computer (SMCI) stock slides as Wall Street selloff bites — what to watch next

Super Micro Computer fell 3.77% to $31.41 Tuesday, with trading volume topping 39.5 million shares. U.S. stocks posted their steepest one-day drop in three months as tariff worries and a Morgan Stanley downgrade hit IT hardware. Dell and Hewlett Packard Enterprise each slid up to 5%. Citigroup cut Super Micro’s price target to $39.
21 January 2026
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IonQ stock whipsaws in late trade as quantum names get caught in tech selloff

IonQ stock whipsaws in late trade as quantum names get caught in tech selloff

IonQ shares slipped 0.3% to $50.66 Tuesday after volatile trading, with volume near 24.6 million shares. Quantum peers D-Wave and Quantum Computing Inc. dropped 6.2% and 5.9% as U.S. stocks fell on tariff news and risk aversion. Rigetti Computing reported an $8.4 million order from India’s C-DAC. Traders now await IonQ’s earnings, expected between Feb. 25 and March 2.
21 January 2026
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Wells Fargo stock price slips as credit-card rate cap fight hits banks — what’s next

Wells Fargo stock price slips as credit-card rate cap fight hits banks — what’s next

Wells Fargo shares fell 1.9% to $86.66 Tuesday as bank stocks dropped on concerns over a proposed 10% cap on credit-card interest rates. President Trump is pushing the limit, but details on implementation remain unclear. The American Bankers Association warns up to 159 million cardholders could lose access if the cap is enacted. Wells Fargo will appear at a key conference Feb. 10.
21 January 2026
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Applied Digital stock drops 5% as tariff jitters hit high-beta AI data center names — what to watch next for APLD

Applied Digital stock drops 5% as tariff jitters hit high-beta AI data center names — what to watch next for APLD

Applied Digital shares fell 5.2% to $35.46 Tuesday as U.S. stocks and Bitcoin dropped sharply, following President Trump’s tariff warning. The Nasdaq slid 2.4%, while Bitcoin lost 3.78%. Investors are watching for updates on tariffs, interest rates, and Applied Digital’s major tenant leasing talks. The company reported $2.3 billion in cash and $2.6 billion in debt last quarter.
21 January 2026
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Amphenol stock slides as Trump tariff threat shakes Wall Street; Jan. 28 earnings next up

Amphenol stock slides as Trump tariff threat shakes Wall Street; Jan. 28 earnings next up

Amphenol shares closed down 1.3% at $152.33 Tuesday, outperforming several peers as U.S. stocks posted their steepest drop in three months after new tariff threats on European imports. Trading volume in Amphenol jumped to 10.6 million shares. The company recently closed its acquisition of CommScope’s cable unit and will report earnings Jan. 28.
21 January 2026
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Cisco stock price drops as tariff fears shake tech; Wi‑Fi 7 campus deal in focus

Cisco stock price drops as tariff fears shake tech; Wi‑Fi 7 campus deal in focus

Cisco shares fell 2.45% to $73.35 Tuesday as Wall Street posted its sharpest drop in three months after President Trump announced new tariffs on European imports. Trading volume reached 23.8 million shares. Cisco also unveiled a multi-year campus network deal with Georgetown University and a new tech partnership with Australian AI firm SharonAI. The company declared a $0.41 quarterly dividend, payable Jan. 21.
21 January 2026
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Qualcomm stock extends seven-day skid as tariff fears rattle tech; QCOM earnings up next

Qualcomm stock extends seven-day skid as tariff fears rattle tech; QCOM earnings up next

Qualcomm shares fell 3.36% to $154.07 Tuesday, extending losses for a seventh straight session as chip stocks slid with the broader market. Trading volume reached 11.8 million, well above the 50-day average. Wall Street posted its steepest drop in three months after President Trump announced new tariffs on European goods. The S&P 500 lost 2.06%, and the Nasdaq dropped 2.39%.
21 January 2026
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Marvell (MRVL) stock slides with tech as Trump tariff threat jolts Wall Street — what to watch next

Marvell (MRVL) stock slides with tech as Trump tariff threat jolts Wall Street — what to watch next

Marvell Technology shares fell 0.8% to $79.80 Tuesday after volatile trading, as U.S. markets posted their steepest drop in three months on news of new Trump tariffs targeting Europe. The S&P 500 slid 2.06% and the Nasdaq lost 2.39%, both breaching key technical levels. Wall Street’s fear gauge hit its highest since November. European leaders will hold an emergency summit Thursday in response.
21 January 2026
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Caterpillar stock drops nearly 3% as tariff jitters rattle industrials — what to watch next

Caterpillar stock drops nearly 3% as tariff jitters rattle industrials — what to watch next

Caterpillar shares fell 2.8% to $629 Tuesday, underperforming peers after President Trump threatened tariffs on European imports tied to Greenland talks. Trading volume reached 2.7 million shares. Oppenheimer raised its price target to $700, citing macro factors ahead of Caterpillar’s Jan. 29 earnings. The stock went ex-dividend, with a $1.51 payout due Feb. 19.
21 January 2026
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Merck (MRK) stock ends higher on long-term Keytruda cancer-vaccine data; Guardant pact and earnings ahead

Merck (MRK) stock ends higher on long-term Keytruda cancer-vaccine data; Guardant pact and earnings ahead

Merck shares rose 0.6% to $109.45 Tuesday, defying a broad U.S. market selloff. Five-year data showed its personalized melanoma vaccine with Moderna cut recurrence or death risk by 49% in a Phase 2b trial. Investors await Phase 3 trial timing and Merck’s Feb. 3 earnings call for more details. The S&P 500 fell 2.06% and Nasdaq lost 2.39%.
21 January 2026
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D-Wave Quantum stock slides after Quantum Circuits deal closes and a 10.4 million-share resale filing hits

D-Wave Quantum stock slides after Quantum Circuits deal closes and a 10.4 million-share resale filing hits

D-Wave Quantum shares fell 6.2% to $27.04 after registering 10.43 million shares for resale tied to its $532 million Quantum Circuits acquisition. The company will not receive proceeds from these sales. Trading volume reached about 51 million shares. Investors are watching for updates at D-Wave’s Qubits conference next week.
21 January 2026
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Stock Market Today

Tower Semiconductor stock jumps again on Nvidia optics tie-up as earnings near

Tower Semiconductor stock jumps again on Nvidia optics tie-up as earnings near

8 February 2026
Tower Semiconductor shares rose 7.7% to $139.04 Friday after announcing a collaboration with Nvidia on AI data-center networking. The stock touched $141 intraday and gained another 1% after hours. Investors await Tower’s Feb. 11 earnings for details on its silicon photonics work. No financial terms or shipment timeline were disclosed.
Longsys Electronics stock heads into Monday after new guarantees; what 301308 investors watch next

Longsys Electronics stock heads into Monday after new guarantees; what 301308 investors watch next

8 February 2026
Longsys disclosed new guarantees for a 100 million yuan Hong Kong loan and a $9 million Brazil credit line, bringing its total approved guarantee quota to 11 billion yuan and outstanding guarantees to 5.81 billion yuan. The company said all guarantees are for consolidated subsidiaries and within approved limits. Shares closed at 288 yuan Friday, down 1.6%. China inflation and credit data are due this week.
MACOM stock price steadies near highs into Monday after earnings pop and fresh filings

MACOM stock price steadies near highs into Monday after earnings pop and fresh filings

8 February 2026
MACOM shares rose 3.5% to $235.87 Friday after the company reported fiscal Q1 revenue of $271.6 million and raised its full-year data center growth outlook to 35–40%. Fidelity’s FMR LLC disclosed a 10.7% stake, while shareholder Susan Ocampo filed to potentially sell up to 100,000 shares. Stifel raised its price target to $255. MACOM expects to repay $161 million in convertible notes in March.
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