September Stock Market Volatility Increases…Why You Should Keep ‘Cash’ Rather Than Chasing Every Wave | Myeong Min-jun, Park Ga-young, Yu Yeong-hwa

September Stock Market Volatility Increases…Why You Should Keep ‘Cash’ Rather Than Chasing Every Wave | Myeong Min-jun, Park Ga-young, Yu Yeong-hwa [Stock Beginner Rescue Team]
Watch on YouTube ↗  |  August 26, 2026 at 12:30  |  57:47  |  3PRO TV (삼프로TV)
Speakers
Yu Yeong-hwa — Deputy Department Head, KB Securities

Summary

KB Securities' Yu Yeong-hwa argues investors should hold cash and avoid chasing short-term sector moves in a choppy, non-trending market. She expects Nvidia and Jackson Hole event risks to pass relatively well, with stablecoin and Treasury signals worth monitoring. Her favored structural themes are construction and nuclear power, while she is cautious on cosmetics and constructive on US biotech and Hyundai robotics.

  • The discussion centers on September volatility and why cash discipline matters after July losses.
  • Nvidia earnings are expected to be okay, with AI hardware likely to see limited downside.
  • Jackson Hole may not be a major negative unless stablecoin and Treasury policy signals disappoint.
  • The market could recover after event risks if US inflation and labor data stay benign.
  • Construction is favored as an infrastructure play tied to nuclear, AI data centers, and semiconductor fabs.
  • Cosmetics is viewed as overextended and prone to profit-taking into September.
  • US biotech and gene analysis are seen as beneficiaries of personalized cancer drug development and AI.
  • Hyundai Motor and Hyundai Mobis retain a robotics edge from real-world factory data and actuators.
Ideas
Yu Yeong-hwa Deputy Department Head, KB Securities 7:21
Nvidia earnings likely okay, downside limited.
Ahead of Nvidia earnings, she argues AI hardware names are unlikely to see the sharp one-day sector-wide selloffs seen in recent quarters. TSMC revenue already supports solid Nvidia results, margin softening is the main concern, and the more important issue is whether Rubin mass production stays on schedule.
Yu Yeong-hwa Deputy Department Head, KB Securities 10:51
Stablecoin-friendly Jackson Hole could lower yields.
Jackson Hole's official theme is payments. If policymakers voice support for stablecoins, stablecoin demand could become a structural buyer of short-term Treasuries. Even if that demand is not immediate, confirmation that the Fed and Treasury are cooperating to lower bond yields would likely push yields down because bond markets are highly sensitive.
Yu Yeong-hwa Deputy Department Head, KB Securities 13:01
Market likely higher after event risks clear.
After Nvidia and Jackson Hole pass, if PCE, employment, and CPI data keep signaling that the Fed is not moving toward a September rate hike, she expects the market to move higher into the following week. Falling US yields would be a supportive signal for growth stocks.
Yu Yeong-hwa Deputy Department Head, KB Securities 20:21
Hold Samsung and SK Hynix steadily.
For investors holding large positions in Samsung Electronics and SK hynix, she says they do not need to chase short-term sector rotation. If an investor lacks confidence in trading volatility, holding these large-cap leaders as steady, compressing/uptrending names is a valid strategy.
Yu Yeong-hwa Deputy Department Head, KB Securities 25:05
Keep cash, manage position size now.
In a choppy, non-trending market, investors should hold some cash rather than being 100 percent deployed. Cash reduces emotional swings, prevents forced mistakes after losses, and preserves the ability to pursue the next opportunity. If investors are not good at this market, resting is also a strategy.
Yu Yeong-hwa Deputy Department Head, KB Securities 32:44
Buy large-cap construction on infrastructure momentum.
Construction is the intersection of nuclear power, AI data centers, and semiconductor fab capex. Unlike apartment and real estate construction, these projects are less cyclical and must be built over the next two to three years. She prefers large-cap, earnings-supported names and notes that institutions are leading the trade.
Yu Yeong-hwa Deputy Department Head, KB Securities 43:06
Nuclear momentum strong on US power shortage.
US power shortages, gas turbine and generator supply-chain delays, and Westinghouse IPO and stake-involvement catalysts are accelerating large nuclear orders, SMRs, and related power infrastructure. Korea has the construction capability and supply chain to participate, and institutions are buying names like Doosan Enerbility.
Yu Yeong-hwa Deputy Department Head, KB Securities 45:13
Avoid cosmetics after sharp short-term rally.
Cosmetics names such as Cosmax and Kolmar have rallied sharply as short-term substitutes while semis rested. By September institutions tend to take profits after strong first-half performance. The sector is consumer-driven and trend-sensitive, so she prefers longer-duration infrastructure momentum in construction over cosmetics.
Yu Yeong-hwa Deputy Department Head, KB Securities 46:42
Gene analysis biotech gains from cancer vaccines.
Moderna's Phase 3 success for a personalized cancer vaccine validates gene-analysis-based drug development. That should expand the gene analysis market, and AI further accelerates biotech drug development. US biotech is acting as a defensive winner while tech rests, with many gene analysis names at new highs.
Yu Yeong-hwa Deputy Department Head, KB Securities 52:40
Hyundai Mobis robotics edge still intact.
Humanoid robot hardware is already commoditizing, so real-world factory data is the key differentiator. Hyundai Motor has an edge because it can mass-produce and deploy Atlas robots in its own factories, while Hyundai Mobis is the actuator play for that robotics path. Investor Day disappointment is short-term and does not derail the medium-to-long-term robotics story.
Up Next

This 3PRO TV (삼프로TV) video, published August 26, 2026, features Yu Yeong-hwa discussing NVDA, STABLECOINS, SHV, EWY, 000660.KS, 005930.KS, CASH, 006360.KS, Hyundai Engineering & Construction, Korean construction ETF, 047040.KS, 034020.KS, Cosmax, 161890.KS, MRNA, XBI, 005380.KS, Hyundai Mobis. 10 trade ideas extracted by AI with direction and confidence scoring.

Speakers: Yu Yeong-hwa  · Tickers: NVDA, STABLECOINS, SHV, EWY, 000660.KS, 005930.KS, CASH, 006360.KS, Hyundai Engineering & Construction, Korean construction ETF, 047040.KS, 034020.KS, Cosmax, 161890.KS, MRNA, XBI, 005380.KS, Hyundai Mobis