$GCTS

$1.27 +$0.04 (3.25%) Close

$GCTS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 92.0M shares outstanding

Who owns GCTS?

By type of holder

Institutions 13.6% Insiders 3.5% Everyone else 82.9%

Concentration Top 10 holders own 13.1%

Vanguard Capital Management LLC 3.3% · Renaissance Technologies LLC 1.8%

Institutional ownership

13.6%

+8.8 pts vs last qtr

Institutional holders

+20 vs last qtr

Net shares bought

+8.1M

by institutions in Q2 2026

New / sold out

28 / 8

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Renaissance Technologies LLC NEW +1.7M
Marshall Wace, LLP NEW +1.3M

Biggest sellers in Q2 2026

GM Advisory Group, LLC SOLD OUT −434.5K
Point72 Asset Management, L.P. SOLD OUT −51.6K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for GCT Semiconductor Holding Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2023–FY2025

+120.4%

+48.45% a year

Each share's claim on the business

−54.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$318M vs $9.07M

over 3 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years56% Under 1 year44%

Quarterly turnover

102.8%

of institutional shares changed hands

Top 10 managers, median time held

2 years

Super Investors

Investment managers reporting GCTS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VC Vanguard Capital Management LLC	3.0M	3.26%	+1.3M (+71.9%)	2024	0.0%
Shares held by quarter Peak holding3.0M (Q2'26) Change over 8 quarters+3.0M Share of the company3.260% Vanguard Capital Management LLC's full portfolio →
RT Renaissance Technologies LLC	1.7M	1.84%	NEW	Q2 '26	0.0%
Shares held by quarter Peak holding1.7M (Q2'26) Change over 8 quarters+1.7M Share of the company1.840% Renaissance Technologies LLC's full portfolio →

Vanguard Capital Management LLC

3.0M

% of company

3.26%

Change vs last qtr

+1.3M (+71.9%)

Held since

2024

Renaissance Technologies LLC

1.7M

% of company

1.84%

Change vs last qtr

NEW

Held since

Q2 '26

28 more super investors behind a free account

See every manager holding GCT Semiconductor Holding Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting GCTS on Form N-PORT; together they hold 4.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$6.37M	2.1M	2.33%	0.00%	June 30, 2026
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$2.38M	800.1K	0.87%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$6.37M

% of company

2.33%

% of the fund

0.00%

As of

June 30, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$2.38M

% of company

0.87%

% of the fund

0.00%

As of

June 30, 2026

11 more funds behind a free account

See every fund holding GCT Semiconductor Holding Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
LK Lee Kyeongho Insider	1.1M	1.21%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.210% Lee Kyeongho's insider activity →
SH Shin Hyunsoo Insider	827.0K	0.90%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.900% Shin Hyunsoo's insider activity →

Lee Kyeongho

Insider

1.1M

% of company

1.21%

Change vs last qtr

—

Held since

—

Shin Hyunsoo

Insider

827.0K

% of company

0.90%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of GCT Semiconductor Holding Inc.

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