Calls
36
#1134
Alpha Score 5.7
Yoon Jeong-sik
Managing Director
Win Rate
22.2%
return
-6.0%
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Ticker
Side
Mentions
First Call
Call Price
P&L
Thesis
Theme
Source
Long
May 15
$290500.00
-3.1%
Samsung Electronics is more attractive for medium-to-long term investment due to its foundry business, which provides a diversified revenue base beyond memory. It has risen less than SK Hynix and offers stability.
AI Memory
Long
May 15
$1959000.00
-11.7%
SK Hynix could see a short-term boost if Samsung's union strike disrupts production, benefiting from shifted orders. However, the stock has already run up 10x from last year, so caution is warranted.
AI Memory
Long
Jul 08
$174800.00
-6.0%
Financial stocks, especially KB Financial Group, have strong earnings and cheap valuations. They were overlooked during the semiconductor rally but are now acting as defensive plays amid increased market volatility, attracting inflows and rising.
Banks
Long
Jun 26
$490000.00
-15.3%
Hyundai Motor's recent sell-off is due to robotic earnings being unquantifiable in the near term, but the long-term robot thesis via Boston Dynamics remains intact and will drive the stock well above previous highs once robot production ramps up. The auto business is also gaining global market share, providing a solid base.
Autos & EV
Long
May 15
$190.52
-6.1%
The KOSPI index target of 10,000 is not unreasonable given strong semiconductor earnings and low valuations, but near-term volatility at the 8,000 level requires digestion.
Equity Indexes
Long
Aug 11
$98.27
-1.2%
Oil refiners are turning profitable with good refining margins and rising oil prices. Large construction companies are also seeing improved domestic housing margins. Both sectors are rebounding from the bottom.
Thematic ETFs
Long
Aug 11
$147000.00
-4.0%
Korean refining stocks (e.g., SK Innovation, S-Oil) have turned to profits, refining margins are in a favorable environment, and the recent sharp rise in international oil prices provides an additional catalyst. The sector is showing a short-term uptrend from the bottom.
Oil & Gas
Long
Aug 11
$126800.00
-1.6%
Korean refining stocks (e.g., SK Innovation, S-Oil) have turned to profits, refining margins are in a favorable environment, and the recent sharp rise in international oil prices provides an additional catalyst. The sector is showing a short-term uptrend from the bottom.
Clean Energy
Long
Jul 08
$160700.00
-18.5%
Kia and Hyundai Mobis are showing positive price action with Kia benefiting from strong Q2 earnings turnaround expectations, illustrating the earnings-driven market theme.
Autos & EV
Long
Aug 21
$126900.00
+1.5%
Financials and insurance stocks are expected to post strong earnings and can act as reliable defensive plays while the broader market remains shaky and lacks investor confidence.
Banks
Long
Aug 21
$28.48
-0.5%
Data centers remain highly profitable in both Korea and the US, indicating that recent market concerns over memory semiconductor demand are only short-term and the broader AI infrastructure trend remains intact.
Thematic ETFs
Long
Aug 21
$237.56
-0.3%
Sectors such as food, shipbuilding, defense, and construction have clearly improving earnings, yet their stock prices remain very cheap, making them highly attractive targets in a market experiencing rapid sector rotation.
Thematic ETFs
Long
Jul 24
$248000.00
+6.9%
Data center electricity demand is surging, and since building enough nuclear plants is unrealistic, renewable energy and ESS (energy storage) will be needed to power them. Domestic Korean renewable energy companies, such as OCI Holdings, stand to benefit from this trend, with improving sentiment and positive news flow supporting their stocks.
Chemicals
Long
Jul 08
$521000.00
-13.1%
Korean shipbuilding stocks are a strong call. They have already achieved the vast majority of their annual order targets, with backlogs extending to 2029-2030. The next phase of growth will come from non-merchant vessels—special-purpose ships, offshore plants, and military vessels—driven by US re-armament and NATO demand. He highlights Hanwha Ocean, HD Hyundai Heavy Industries, and Samsung Heavy Industries as prime beneficiaries and insists the sector should not be abandoned.
Shipbuilding
Long
Jun 26
$166600.00
-35.2%
Semiconductor equipment stocks have no reason to stay weak; new fabs and capacity expansions in Yongin and elsewhere will require steady equipment orders for at least a decade. Stocks like Wonik IPS and PSK are worth attention now as they should begin to rise.
Foundry Equipment
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Yoon Jeong-sik has 36 trade ideas tracked on Buzzberg across 36 tickers since May 2026. Win rate 22% across 36 evaluated calls, average return -6.0%. Ranked #1134 on the Buzzberg Alpha leaderboard. Most covered: 005930.KS, 000660.KS, 005380.KS.
