GCT Semiconductor Holding, Inc. ($GCTS) Insider Transactions

Last updated: 2026-04-02 21:09 UTC | Total transactions: 152

In the last 12 months, insiders at GCT Semiconductor Holding, Inc. ($GCTS) filed 152 transactions with the SEC: 16 open-market purchases totaling $2,986,032 and 0 sales totaling $0. Net insider sentiment: net buying.

GCT Semiconductor Holding, Inc. operates in the Semiconductors & related devices industry (Manufacturing sector).

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View all SEC Filings for GCT Semiconductor Holding, Inc. (GCTS).

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Recent Insider Transactions

Transaction Date Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
March 31, 2026 Shin Hyunsoo Not found A Common Stock 24122 $0.00 804,809.0000 57,099,558 3.09% 0.04%
March 31, 2026 Chun Kukjin Not found A Common Stock 24122 $0.00 89,377.0000 57,099,558 36.97% 0.04%
March 31, 2026 Barker Robert Not found A Common Stock 24122 $0.00 142,451.0000 57,099,558 20.39% 0.04%
March 31, 2026 Chan Nelson Not found A Common Stock 24122 $0.00 125,642.0000 57,099,558 23.76% 0.04%
March 31, 2026 TUDER JEFFREY Not found A Common Stock 24122 $0.00 141,931.0000 57,099,558 20.48% 0.04%
March 31, 2026 Lee Kyeongho Not found A Common Stock 24122 $0.00 1,086,863.0000 57,099,558 2.27% 0.04%
Feb. 23, 2026 Chun Kukjin Not found G Common Stock 40000 $0.00 65,255.0000 57,099,558 38.00% 0.07%
Dec. 31, 2025 Barker Robert Not found A Common Stock 22916 $0.00 118,329.0000 57,099,558 24.02% 0.04%
Dec. 31, 2025 Chan Nelson Not found A Common Stock 22916 $0.00 101,520.0000 57,099,558 29.15% 0.04%
Dec. 31, 2025 Chun Kukjin Not found A Common Stock 22916 $0.00 105,255.0000 57,099,558 27.83% 0.04%
Dec. 31, 2025 Lee Kyeongho Not found A Common Stock 22916 $0.00 1,062,741.0000 57,099,558 2.20% 0.04%
Dec. 31, 2025 Shin Hyunsoo Not found A Common Stock 22916 $0.00 780,687.0000 57,099,558 3.02% 0.04%
Dec. 31, 2025 TUDER JEFFREY Not found A Common Stock 22916 $0.00 117,809.0000 57,099,558 24.15% 0.04%
Nov. 25, 2025 Shin Hyunsoo Not found P Common Stock 16725 $1.28 757,771.0000 57,099,558 2.26% 0.03%
Nov. 21, 2025 Shin Hyunsoo Not found P Common Stock 3180 $1.28 741,046.0000 57,099,558 0.43% 0.01%
Nov. 20, 2025 Shin Hyunsoo Not found P Common Stock 25453 $1.28 737,866.0000 57,099,558 3.57% 0.04%
Sept. 30, 2025 TUDER JEFFREY Not found A Common Stock 18092 $0.00 94,893.0000 48,246,480 23.56% 0.04%
Sept. 30, 2025 Lee Kyeongho Not found A Common Stock 18092 $0.00 1,039,825.0000 48,246,480 1.77% 0.04%
Sept. 30, 2025 Barker Robert Not found A Common Stock 18092 $0.00 95,413.0000 48,246,480 23.40% 0.04%
Sept. 30, 2025 Shin Hyunsoo Not found A Common Stock 18092 $0.00 712,413.0000 48,246,480 2.61% 0.04%
Sept. 30, 2025 Chan Nelson Not found A Common Stock 18092 $0.00 78,604.0000 48,246,480 29.90% 0.04%
Sept. 30, 2025 Chun Kukjin Not found A Common Stock 18092 $0.00 82,339.0000 48,246,480 28.16% 0.04%
Sept. 26, 2025 Schlaefer John President, CEO & Class III Dir J Common Stock, par value $0.0001 per share 555 $0.00 202,728.0000 48,246,480 0.27% 0.00%
Sept. 19, 2025 Cheng Edmond Chief Financial Officer A Common Stock, par value $0.0001 per share 75000 $0.00 151,000.0000 48,246,480 98.68% 0.16%
Sept. 19, 2025 Schlaefer John President, CEO & Class III Dir A Common Stock, par value $0.0001 per share 75000 $0.00 202,173.0000 48,246,480 58.97% 0.16%
Sept. 19, 2025 Kim Jeong-Min Chief Technology Officer A Common Stock, par value $0.0001 per share 75000 $0.00 302,701.0000 48,246,480 32.94% 0.16%
Sept. 19, 2025 Sum Alex Sr. VP of Sales and Marketing A Common Stock, par value $0.0001 per share 75000 $0.00 183,743.0000 48,246,480 68.97% 0.16%
Sept. 12, 2025 Shin Hyunsoo Not found P Common Stock 44067 $1.51 694,321.0000 48,246,480 6.78% 0.09%
Sept. 5, 2025 Shin Hyunsoo Not found P Common Stock 10300 $1.30 650,254.0000 48,246,480 1.61% 0.02%
Sept. 4, 2025 Shin Hyunsoo Not found P Common Stock 8250 $1.26 639,954.0000 48,246,480 1.31% 0.02%
Aug. 15, 2025 Shin Hyunsoo Not found P Common Stock 121000 $1.26 631,704.0000 48,246,480 23.69% 0.25%
June 30, 2025 Chan Nelson Not found A Common Stock 18456 $0.00 60,512.0000 48,246,480 43.88% 0.04%
June 30, 2025 Barker Robert Not found A Common Stock 18456 $0.00 77,321.0000 48,246,480 31.35% 0.04%
June 30, 2025 TUDER JEFFREY Not found A Common Stock 18456 $0.00 76,801.0000 48,246,480 31.63% 0.04%
June 30, 2025 Shin Hyunsoo Not found A Common Stock 18456 $0.00 510,704.0000 48,246,480 3.75% 0.04%
June 30, 2025 Lee Kyeongho Not found A Common Stock 18456 $0.00 1,021,733.0000 48,246,480 1.84% 0.04%
June 30, 2025 Chun Kukjin Not found A Common Stock 18456 $0.00 64,247.0000 48,246,480 40.30% 0.04%
June 10, 2025 Shin Hyunsoo Not found P Common Stock 45000 $1.16 492,248.0000 48,246,480 10.06% 0.09%
June 10, 2025 Shin Hyunsoo Not found P Common Stock 40000 $1.20 447,248.0000 48,246,480 9.82% 0.08%
June 4, 2025 Shin Hyunsoo Not found P Common Stock 80000 $1.02 327,248.0000 48,246,480 32.36% 0.17%
June 5, 2025 Shin Hyunsoo Not found P Common Stock 58700 $1.03 385,948.0000 48,246,480 17.94% 0.12%
June 5, 2025 Shin Hyunsoo Not found P Common Stock 21300 $1.02 407,248.0000 48,246,480 5.52% 0.04%
May 23, 2025 Shin Hyunsoo Class II Director P Common Stock 77000 $1.04 247,248.0000 48,246,480 45.23% 0.16%
May 20, 2025 Shin Hyunsoo Class II Director P Common Stock 86000 $1.18 170,248.0000 48,246,480 102.08% 0.18%
March 26, 2025 TUDER JEFFREY Not found J Warrants 20734 $0.00 0.0000 48,246,480 0.00% 0.04%
March 26, 2025 TUDER JEFFREY Not found J Common Stock 16289 $0.00 58,345.0000 48,246,480 38.73% 0.03%
March 26, 2024 Barker Robert Not found A Common Stock, par value $0.0001 per share 3735 $0.00 16,809.0000 0 28.57% 0.00%
March 26, 2024 Barker Robert Not found A Stock Option (Right to Buy) 1867 $0.00 1,867.0000 0 9999.99% 0.00%
March 26, 2024 Barker Robert Not found A Stock Option (Right to Buy) 933 $0.00 933.0000 0 9999.99% 0.00%
March 26, 2024 Barker Robert Not found A Common Stock, par value $0.0001 per share 13074 $0.00 13,074.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Common Stock, par value $0.0001 per share 215286 $0.00 215,286.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Stock Option (Right to Buy) 18676 $0.00 18,676.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Stock Option (Right to Buy) 59952 $0.00 59,952.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Stock Option (Right to Buy) 3731 $0.00 3,731.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Common Stock, par value $0.0001 per share 12415 $0.00 227,701.0000 0 5.77% 0.00%
March 31, 2025 Lee Kyeongho Not found A Common Stock 16768 $0.00 1,003,277.0000 48,246,480 1.70% 0.03%
March 31, 2025 Barker Robert Not found A Common Stock 16768 $0.00 58,865.0000 48,246,480 39.83% 0.03%
March 31, 2025 Shin Hyunsoo Not found A Common Stock 16768 $0.00 84,248.0000 48,246,480 24.85% 0.03%
March 31, 2025 Chun Kukjin Not found A Common Stock 16768 $0.00 45,791.0000 48,246,480 57.77% 0.03%
March 31, 2025 TUDER JEFFREY Not found A Common Stock 16768 $0.00 42,056.0000 48,246,480 66.31% 0.03%
March 31, 2025 Chan Nelson Not found A Common Stock 16768 $0.00 42,056.0000 48,246,480 66.31% 0.03%
March 26, 2025 Concord Sponsor Group III LLC TenPercentOwner J Warrant 3948086 $0.00 0.0000 48,246,480 100.00% 8.18%
March 26, 2025 Concord Sponsor Group III LLC TenPercentOwner J Common Stock 3101241 $0.00 632,586.0000 48,246,480 83.06% 6.43%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Common Stock, par value $0.0001 per share 12804 $0.00 12,804.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 21533 $0.00 21,533.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 28191 $0.00 28,191.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 35669 $0.00 35,669.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Common Stock, par value $0.0001 per share 78700 $0.00 78,700.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex Sr. VP of Sales and Marketing A Stock Option (Right to Buy) 9338 $0.00 9,338.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex Sr. VP of Sales and Marketing A Stock Option (Right to Buy) 13540 $0.00 13,540.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex Sr. VP of Sales and Marketing A Stock Option (Right to Buy) 13820 $0.00 13,820.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex Sr. VP of Sales and Marketing A Stock Option (Right to Buy) 13259 $0.00 13,259.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex Sr. VP of Sales and Marketing A Common Stock, par value $0.0001 per share 5341 $0.00 5,341.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex Sr. VP of Sales and Marketing A Common Stock, par value $0.0001 per share 90143 $0.00 90,143.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 50425 $0.00 50,425.0000 0 9999.99% 0.00%
Jan. 13, 2025 Schlaefer John President, CEO & Class III Dir M Common Stock, par value $0.0001 per share 35669 $0.11 127,173.0000 0 38.98% 0.00%
Jan. 13, 2025 Schlaefer John President, CEO & Class III Dir M Stock Option (Right to Buy) 35669 $0.00 0.0000 0 100.00% 0.00%
Feb. 19, 2025 Sum Alex Sr. VP of Sales and Marketing M Common Stock, par value $0.0001 per share 13259 $0.11 108,743.0000 0 13.89% 0.00%
Feb. 19, 2025 Sum Alex Sr. VP of Sales and Marketing M Stock Option (Right to Buy) 13259 $0.00 0.0000 0 100.00% 0.00%
Dec. 31, 2024 CHAN NELSON C Not found A Common Stock 11802 $0.00 25,288.0000 0 87.51% 0.00%
Dec. 31, 2024 TUDER JEFFREY Not found A Common Stock 11802 $0.00 25,288.0000 0 87.51% 0.00%
Dec. 31, 2024 Shin Hyunsoo Not found A Common Stock 11802 $0.00 67,693.0000 0 21.12% 0.00%
Dec. 31, 2024 Lee Kyeongho Not found A Common Stock 11802 $0.00 1,697,279.0000 0 0.70% 0.00%
Dec. 31, 2024 Chun Kukjin Not found A Common Stock 11802 $0.00 28,964.0000 0 68.77% 0.00%
Dec. 31, 2024 Barker Robert Not found A Common Stock 11802 $0.00 41,162.0000 0 40.20% 0.00%
Dec. 13, 2024 Shin Hyunsoo Not found A Common Stock 200 $2.50 18,891.0000 0 1.07% 0.00%
Dec. 13, 2024 Shin Hyunsoo Not found A Common Stock 800 $2.50 18,691.0000 0 4.47% 0.00%
Dec. 16, 2024 Shin Hyunsoo Not found A Common Stock 37000 $2.57 55,891.0000 0 195.86% 0.00%
Sept. 30, 2024 CHAN NELSON C Not found A Common Stock 8208 $0.00 13,486.0000 0 155.51% 0.00%
Sept. 30, 2024 TUDER JEFFREY Not found A Common Stock 8208 $0.00 13,486.0000 0 155.51% 0.00%
Sept. 30, 2024 Shin Hyunsoo Not found A Common Stock 8208 $0.00 17,891.0000 0 84.77% 0.00%
Sept. 30, 2024 Lee Kyeongho Not found A Common Stock 8208 $0.00 1,685,477.0000 0 0.49% 0.00%
Sept. 30, 2024 Chun Kukjin Not found A Common Stock 8208 $0.00 17,162.0000 0 91.67% 0.00%
Sept. 30, 2024 Barker Robert Not found A Common Stock 8208 $0.00 29,360.0000 0 38.80% 0.00%
Sept. 26, 2024 Anapass, Inc. Not found P Common Stock 741603 $3.02 8,017,466.0000 0 10.19% 0.00%
Sept. 26, 2024 Anapass, Inc. Not found P Warrant to Purchase Common Stock 148320 $0.00 148,320.0000 0 9999.99% 0.00%
Aug. 21, 2024 Cheng Edmond Chief Financial Officer A Common Stock 76000 $0.00 76,000.0000 0 9999.99% 0.00%
June 30, 2024 TUDER JEFFREY Not found A Common Stock 5278 $0.00 5,278.0000 0 9999.99% 0.00%
June 30, 2024 Shin Hyunsoo Not found A Common Stock 5278 $0.00 9,683.0000 0 119.82% 0.00%
June 30, 2024 Barker Robert Not found A Common Stock 5278 $0.00 21,152.0000 0 33.25% 0.00%
June 30, 2024 CHAN NELSON C Not found A Common Stock 5278 $0.00 5,278.0000 0 9999.99% 0.00%
June 30, 2024 Chun Kukjin Not found A Common Stock 5278 $0.00 8,954.0000 0 143.58% 0.00%
June 30, 2024 Lee Kyeongho Not found A Common Stock 5278 $0.00 1,677,269.0000 0 0.32% 0.00%
March 26, 2024 Lee Kyeongho Not found A Common Stock, par value $0.0001 per share 93380 $0.00 97,530.0000 0 2250.12% 0.00%
March 26, 2024 Lee Kyeongho Not found J Private Placement Warrants 800000 $0.00 800,000.0000 0 9999.99% 0.00%
March 26, 2024 Anapass, Inc. Not found A Common Stock 7275863 $0.00 7,275,863.0000 0 9999.99% 0.00%
March 26, 2024 Anapass, Inc. Not found J Private Placement Warrants 937350 $0.00 937,350.0000 0 9999.99% 0.00%
March 26, 2024 Lee Kyeongho Not found A Common Stock, par value $0.0001 per share 867840 $0.00 871,990.0000 0 9999.99% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner A Warrant 8260606 $0.00 8,260,606.0000 0 9999.99% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner J Warrant 2478182 $0.00 5,782,424.0000 0 30.00% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner J Warrant 1834338 $0.00 3,948,086.0000 0 31.72% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner J Common Stock 1304477 $0.00 4,992,126.0000 0 20.72% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner J Common Stock 729072 $0.00 6,296,603.0000 0 10.38% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner J Common Stock 932052 $0.00 7,025,675.0000 0 11.71% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner C Common Stock 1 $0.00 7,957,727.0000 0 0.00% 0.00%
March 26, 2024 Concord Sponsor Group III LLC TenPercentOwner C Class B Common Stock 1 $0.00 0.0000 0 100.00% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Stock Option (Right to Buy) 18676 $0.00 18,676.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Stock Option (Right to Buy) 59952 $0.00 59,952.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Stock Option (Right to Buy) 82359 $0.00 3,731.0000 0 0.00% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Common Stock, par value $0.0001 per share 12415 $0.00 12,415.0000 0 9999.99% 0.00%
March 26, 2024 Kim Jeemee VP of Engineering & CTO A Common Stock, par value $0.0001 per share 215285 $0.00 215,285.0000 0 9999.99% 0.00%
March 26, 2024 Shin Hyunsoo Not found A Stock Option (Right to Buy) 6536 $0.00 6,536.0000 0 9999.99% 0.00%
March 26, 2024 Shin Hyunsoo Not found A Common Stock, par value $0.0001 per share 3735 $0.00 3,735.0000 0 9999.99% 0.00%
March 26, 2024 Shin Hyunsoo Not found A Common Stock, par value $0.0001 per share 456 $0.00 456.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Stock Option (Right to Buy) 18676 $0.00 18,676.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Stock Option (Right to Buy) 20543 $0.00 20,543.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Stock Option (Right to Buy) 13540 $0.00 13,540.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Stock Option (Right to Buy) 9431 $0.00 9,431.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Stock Option (Right to Buy) 6536 $0.00 6,536.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Common Stock, par value $0.0001 per share 8204 $0.00 8,204.0000 0 9999.99% 0.00%
March 26, 2024 Yoon David Vice President of Finance A Common Stock, par value $0.0001 per share 30093 $0.00 30,093.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex VP of Marketing and Sales A Stock Option (Right to Buy) 9338 $0.00 9,338.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex VP of Marketing and Sales A Stock Option (Right to Buy) 13540 $0.00 13,540.0000 0 9999.99% 0.00%
March 26, 2024 Anapass, Inc. Not found A Common Stock 7275863 $0.00 7,275,863.0000 0 9999.99% 0.00%
March 26, 2024 Lee Kyeongho Not found A Common Stock, par value $0.0001 per share 867840 $0.00 871,990.0000 0 9999.99% 0.00%
March 26, 2024 Lee Kyeongho Not found A Common Stock, par value $0.0001 per share 93380 $0.00 97,530.0000 0 2250.12% 0.00%
March 26, 2024 Sum Alex VP of Marketing and Sales A Stock Option (Right to Buy) 13820 $0.00 13,820.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex VP of Marketing and Sales A Stock Option (Right to Buy) 13259 $0.00 13,259.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex VP of Marketing and Sales A Common Stock, par value $0.0001 per share 90142 $0.00 90,142.0000 0 9999.99% 0.00%
March 26, 2024 Sum Alex VP of Marketing and Sales A Common Stock, par value $0.0001 per share 5341 $0.00 5,341.0000 0 9999.99% 0.00%
March 26, 2024 Barker Robert Not found A Stock Option (Right to Buy) 1867 $0.00 1,867.0000 0 9999.99% 0.00%
March 26, 2024 Barker Robert Not found A Stock Option (Right to Buy) 933 $0.00 933.0000 0 9999.99% 0.00%
March 26, 2024 Barker Robert Not found A Common Stock, par value $0.0001 per share 3735 $0.00 3,735.0000 0 9999.99% 0.00%
March 26, 2024 Barker Robert Not found A Common Stock, par value $0.0001 per share 13073 $0.00 13,073.0000 0 9999.99% 0.00%
March 26, 2024 Chun Kukjin Not found A Stock Option (Right to Buy) 6536 $0.00 6,536.0000 0 9999.99% 0.00%
March 26, 2024 Chun Kukjin Not found A Common Stock, par value $0.0001 per share 3735 $0.00 3,735.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 50425 $0.00 50,425.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 21533 $0.00 21,533.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 28191 $0.00 28,191.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Stock Option (Right to Buy) 35669 $0.00 35,669.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Common Stock, par value $0.0001 per share 12804 $0.00 12,804.0000 0 9999.99% 0.00%
March 26, 2024 Schlaefer John President, CEO & Class III Dir A Common Stock, par value $0.0001 per share 78700 $0.00 78,700.0000 0 9999.99% 0.00%