GCT Semiconductor shares spiked 41% in late trading as the chipmaker got a boost from bets on 5G. New York, May 18, 2026, 17:01 (EDT)
GCT Semiconductor Holding Inc (GCTS.N) jumped 40.98% to close at $2.58 on Monday, its best finish in a year. Shares hit $2.68 during the day, a 52-week high, with volume at 59.7 million shares. GCTS slipped back to $2.50 after hours.
Tech shares lagged. The Nasdaq Composite dropped around 0.5% as technology stocks lost ground, according to Reuters. Nasdaq data had the PHLX Semiconductor Index down 2.47%, dragging chip stocks with it.
GCT is pushing to scale up from a small revenue base to bigger 5G shipments. Last week, the company posted first-quarter revenue up 287.1% at $1.9 million, and said 5G chipset shipments climbed 58% from the previous quarter to 3,000 units. GCT still sees sequential 5G shipment growth through 2026. CEO John Schlaefer said GCT has “entered a new phase” for customer shipments.
GCT brought in a satellite angle on May 7, saying it signed a reference-platform deal with one of the biggest satellite communications firms. GCT will build a design using its 5G and 4G chipsets for new user equipment. Schlaefer said the agreement showed the “trust our partner has placed” in the technology. Business Wire
Lisa Thompson, a senior tech analyst at Zacks Small-Cap Research, wrote in a sponsored report out May 14 that she sees the “sequential ramp to continue” and values the stock at “at least $4.40” using a 2027 revenue estimate of $95 million. According to the report, GCT saw first-quarter revenue from eight end-user customers, compared to three in the fourth quarter.
GCT is a fabless chip designer that outsources manufacturing to third-party foundries. It sells semiconductors for 4G LTE, 5G, fixed wireless access — broadband that skips cable or fiber — and non-terrestrial networks, including satellite connections.
Competition isn’t letting up. GCT listed Qualcomm, MediaTek and Sequans as rivals or likely rivals in its annual filing and cautioned that many competitors have bigger budgets, better-known brands and tighter customer relationships.
The risk on the downside is easy to spot. GCT posted a $9.9 million net loss for the first quarter, burned through $7.4 million in operating cash, and ended with a $615.3 million accumulated deficit. The company flagged “substantial doubt” about staying afloat past 12 months if it doesn’t get more backing. SEC
The stock now sits between two plays. Bulls are betting design wins and satellite deals can land big orders. Skeptics are focused on cash, dilution risk, and whether first 5G shipments will turn into steady revenue.
The tape moved first this time. Purchase orders aren’t in yet.
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