Returns

Perf Half Y

Half-year return

💡 What Is Perf Half Y (6-Month Return)? - A Compass for Mid-Term Investing

Perf Half Y stands for "Performance Half Year." In simple terms, it is the 6-month return or half-year return. It shows, as a percentage (%), how much a stock's price has gone up (or down) over the past 6 months (about 126 trading days). To put it in a familiar analogy, it's like a midterm exam grade at school. It's not the final grade for the whole semester (1 year), but it's a long enough period to clearly show the current direction and trend.

Korean-English Keyword Glossary

Six months is a very meaningful period in investing. Returns over 1 to 3 months can be affected by short-term noise, while anything beyond a year already includes old trends. Six months covers two quarterly earnings releases, giving the market enough time to form a mid-term trend. In addition, many institutional investors and funds evaluate and rebalance their portfolios every six months, so the 6-month return directly affects their investment decisions.

For example, if Nvidia's (NVDA) Perf Half Y is +85%, it means 10 million won invested 6 months ago would now be worth 18.5 million won. On the other hand, if a stock's Perf Half Y is -25%, it means 10 million won has dropped to 7.5 million won. Over a period this long, the result reflects real changes in the company and the market, not just luck or a one-off news story.

📅 Why Compare Returns Across Different Time Periods

6-Month vs. 1-Month and 3-Month Returns

If the 6-month return is solid but the most recent 1 month is weak, the stock may simply be taking a short breather within a longer uptrend. If the 1-month dip is only 10-20% of the 6-month gain, you can treat it as a healthy pullback, and it may actually be a buying opportunity. For example, if Apple (AAPL) rose 20% over 6 months and then fell 5% in the last month, that pullback could be a good entry point.

6-Month vs. 1-Year (YTD) Returns

If the 6-month return is much better than YTD, it means the first half of the year was sluggish but the second half saw a big recovery. This often signals that something important has changed at the company, such as a new product launch or an earnings turnaround. On the flip side, if the 6-month return is worse than YTD, it means the stock has been giving back the gains it made earlier this year over the past 6 months, which is a reason to be cautious.

Annualizing the 6-Month Return

You can roughly estimate the annual return by doubling the 6-month return (simple math). More precisely, you can compound-annualize it with (1 + 6-month return)^2 - 1. For example, +25% over 6 months is about 56% annualized, and +10% over 6 months is about 21% annualized. Annualizing makes it easier to compare with long-term returns at a glance.

📊 How to Read the 6-Month Return

Strong Uptrend: +30% or More

A jump of 30% or more in just 6 months shows very strong momentum. There's likely been a fundamental change at the company, such as a business pivot, adoption of new technology, or a major contract win. Nvidia (NVDA) during its AI growth phase and Meta (META) during its "year of efficiency" posted 6-month returns at this level. The momentum is powerful, but you should still check whether the valuation has become overheated.

Solid Uptrend: +10% to +30%

This translates to roughly 20-60% annualized, which is a great performance. Large-cap blue chips like Microsoft (MSFT) and Amazon (AMZN) often fall in this range during a bull market. It's a healthy uptrend, and if it continues, you can consider adding to your position.

Sideways: -5% to +10%

The stock has been moving sideways or ticking up slightly for 6 months with no big swings. This is a directionless zone where the market or the company may be waiting for a catalyst. Keep an eye out: a sudden surge in trading volume here can lead to a "breakout" that decides the direction.

Downtrend: -10% or Worse

A drop of 10% or more over 6 months points to a clear mid-term downtrend. There may be fundamental causes such as weak earnings, tougher competition, or a sector slowdown. It's important to tell whether the whole market is falling or just that one stock. If the market is up but the stock is down 10%, there's likely a company-specific problem.

🔄 Combining 6-Month Return With Other Indicators

Momentum Factor Strategy

Academic research shows a "momentum effect": stocks with strong 6-12 month returns tend to keep rising over the next 3-6 months. Usually, the very latest 1-month return is excluded because short-term overheating often leads to a reversal. So the most attractive setup for momentum investors is "top 6-month return + a small pullback in the last month."

Spotting Sector Rotation

Comparing 6-month returns across sectors tells you where the big money is flowing. For example, if the tech sector is +25% over 6 months while utilities are -5%, the market is in "Risk On" mode, favoring growth stocks and avoiding defensives. The opposite pattern would suggest you need a more defensive positioning.

6-Month Return + RSI Combo

A stock with a healthy 6-month return and an RSI that isn't overbought (below 70) means the uptrend is still in good shape. If the 6-month return is strong but RSI is above 80, the stock is short-term overheated, so it's better to wait for a pullback. If the 6-month return is poor and RSI is below 30, you might expect an oversold bounce, but it's safer to wait until the trend actually turns before buying.

🎯 Practical Tips

Semi-Annual Portfolio Rebalancing

Every 6 months, compare the half-year return of each holding against the S&P 500 and rebalance. Consider swapping out any stock that has lagged the market for 6 months in a row, and take partial profits on any stock that has massively outperformed and become overweight. This automatically creates a "keep the winners, drop the losers" effect in your portfolio.

Trend Confirmation Tool

A stock that has consistently posted positive 6-month returns is in a mid-term uptrend. Before buying a stock, look at its recent half-year returns; that helps you judge whether the trend is sustainable. Three consecutive positive half-year returns signal a strong uptrend, while alternating positives and negatives mean a trendless, sideways market.

Using Finviz Screener

On Finviz, you can use the "Perf Half Y" filter to search for stocks within a specific 6-month return range. For example, a combo like "Perf Half Y +10% to +30% + Large Cap + Above SMA200" finds large-caps in a mid-term uptrend. These stocks often attract institutional interest, which gives you an edge in liquidity and stability.

⚠️ Things to Watch Out For

1. Starting-Point Bias: If 6 months ago happened to be right after a crash, the return can look artificially high. Always check what was going on at the starting point.

2. Earnings Season Effect: Two quarterly earnings reports fall within any 6-month window. Whether those reports were good or bad can heavily sway the 6-month return. What matters more is the outlook for future earnings.

3. Dividends Aren't Included: Perf Half Y only reflects price moves. For high-dividend stocks, the true 6-month total return can be 1.5-2.5% higher than the displayed return (half of an annual 3-5% dividend).

4. Limits of Trend-Following: Chasing a stock after an extreme 6-month gain means you risk "showing up after the party's already over." When the return is unusually high, a pullback may be coming, so always check valuation.

5. Changing Market Environment: There's no guarantee that the market environment of the past 6 months (rates, liquidity, economy) will stay the same over the next 6 months. Past returns are just the result of past conditions; if those conditions change, future results will too.

✅ Checklist

☑ Did I compare the 6-month return against the S&P 500 (SPY)?
☑ Did I analyze the trend alongside 1-month, 3-month, and 1-year returns?
☑ Did I compare the 6-month return with peers in the same sector?
☑ Did I check how earnings reports during the 6 months affected the return?
☑ Did I judge whether the current valuation justifies the 6-month gain?
☑ Did I factor in the total return including dividends?
☑ Did I check what the market looked like 6 months ago?
☑ Did I look at upcoming catalysts (earnings, events) for the next 6 months?

❓ Frequently Asked Questions (FAQ)

Q. Which is more useful: the 6-month return or the quarterly (3-month) return?

A. It depends on your investing style. For swing traders (holding for weeks to months), the 3-month return reacts faster and is more useful. For mid-term investors (6 months to a year), the 6-month return gives a more stable read on the trend. Best practice is to look at both. If both 3-month and 6-month are positive, the trend is solid. If 3-month is negative but 6-month is positive, the stock is in a recent pullback but the bigger trend is still intact.

Q. If a stock has a great 6-month return, is it too late to buy?

A. Not necessarily. Academic research shows that stocks with strong 6-month momentum tend to keep climbing. The key is whether the reason behind the rally is sustainable. If the move is driven by a structural growth story (like AI or cloud, which are mega-trends), there's still room to run. If it's from a one-off event (a single contract, a subsidy), there may not be much fuel left. Also, if the current P/E isn't way above its historical average, there may still be opportunity.

Q. How do I check the 6-month return of the S&P 500 itself?

A. Just look at the 6-month return of SPY (the S&P 500 ETF). On Finviz, search for SPY and you'll see its Perf Half Y directly; it's also available on Yahoo Finance. The historical average 6-month return for the S&P 500 is around +5% (half of an annual 10%). If it's much higher than that, the market may be overheated. If it's negative, we may be in a bear market.

Q. How should I interpret stocks with extreme 6-month returns, like -50% or +100%?

A. An extreme return is a signal that something fundamental has changed at the company. +100% usually comes with reasons like a successful new business, a turnaround, or an M&A deal. -50% usually comes with serious earnings deterioration, regulatory risk, or losing out to a competitor. Either way, you need to pinpoint the exact cause. For sharp gainers, it's safer to wait for a pullback instead of chasing. For sharp losers, you can consider scaling in after confirming a bottom, but if the cause of the drop is structural, further declines are likely, so it's better to avoid.

🇰🇷 Notes for Korean Investors

FX Impact Over 6 Months: The KRW/USD exchange rate can swing 5-10% or more over 6 months. Even if your stock return is +15%, if the won strengthens by 5% over the same period, your return in won terms shrinks to about +10%. Whenever you review your investment performance every 6 months, factor in the FX effect as well.

Recommended Semi-Annual Rebalancing: Many professional investors recommend rebalancing every 6 months. Check your portfolio's half-year performance at the end of June and December (or end of March and September), swap out underperformers, and adjust your weightings.

Tax Planning: Reviewing realized gains and losses every 6 months helps with year-end tax planning. If your realized gains through June exceed the 2.5 million won basic exemption, consider selling losing positions in the second half to lock in tax losses and lower your tax bill.

Where to Find the Data: It's easy to use the "Perf Half Y" filter on Finviz Screener, view 6-month returns on the Finviz heatmap, or set the 6-month period on Yahoo Finance charts.