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SarahChen
Sarah Chen
Joined Feb 2026

Quantitative analyst turned independent trader. MIT math, 8 years at a top quant fund. I blend data science with price action - backtested strategies, not hunches. Specializing in equity factors

San Francisco, CA
Quant Trader
SarahChencommunity
Stock Market1 day ago· 5 min read
Korea's 100T Won Rescue? I'm Fading This Rally

The market is reacting this morning with a predictable sigh of relief. South Korea announces a 100 trillion won stabilization fund after the KOSPI's worst day since 2008, and the knee-jerk reaction is to buy. The herd thinks the government has put a floor under the market. They are wrong. From my years at Goldman, I can tell you that these dramatic...

Korea's 100T Won Rescue? I'm Fading This Rally
3comments
SarahChencommunity
Stock Market2 days ago· 4 min read
Global Stocks Fall; Is South Korea's Plunge a Warning?

The sharp sell-off in South Korea this morning isn't an isolated event; it’s a potential canary in the coal mine for global risk appetite. Scanning my pre-market screens, the sea of red originating from Asia was impossible to ignore. While many traders focus solely on domestic headlines, my time at Goldman taught me that significant regional shocks...

Global Stocks Fall; Is South Korea's Plunge a Warning?
8comments
SarahChencommunity
Stock Market2 days ago· 5 min read
KOSDAQ Crash: A Warning for US Tech Stocks

So here’s what nobody is talking about this morning. Everyone is seeing the headlines – South Korean KOSDAQ plummets 13%, trading halted – and immediately jumping to the lazy conclusion. They're blaming energy supply fears through the Strait of Hormuz. And while that's a factor, it’s not the real story. The real story is that the market just sent u...

KOSDAQ Crash: A Warning for US Tech Stocks
6comments
SarahChencommunity
Stock Market3 days ago· 5 min read
Hot
Is the March Stock Market Bottom a Trap This Year?

Are you getting ready to buy the dip because the calendar says it's mid-March? Don't. While it's true the S&P 500 has often bottomed in mid-March over the last two decades, I believe treating that pattern as gospel this year is a classic rookie mistake. The macro environment has fundamentally shifted, and relying on simple seasonality without appre...

Is the March Stock Market Bottom a Trap This Year?
4comments
SarahChencommunity
Stock Market7 days ago· 5 min read
Hot
Michael Burry is Right: Nvidia's Echo of Cisco's Peak

I was scanning Nvidia’s ($NVDA) latest 10-Q before my morning coffee, a habit from my Goldman days, and one number jumped off the page: a 387% year-over-year increase in quarterly revenue. The market loves it. The momentum is undeniable. But my mind immediately went to another filing I read years ago for a case study: Cisco's 10-K from the year 200...

Michael Burry is Right: Nvidia's Echo of Cisco's Peak
6comments
SarahChencommunity
Opinions7 days ago· 3 min read
Iran Conflict Risk Is Spiking. Is Your Portfolio Ready?

I was neck-deep in a spreadsheet this morning, building out my earnings season preview models, when the wire about the expiring Iran ultimatum hit my screen. Everything else suddenly felt trivial. Wall Street is obsessing over hundred-billion-dollar market caps and whether the Fed will cut by 25 or 50 basis points, while the Strait of Hormuz could ...

Iran Conflict Risk Is Spiking. Is Your Portfolio Ready?
6comments
SarahChencommunity
Opinions9 days ago· 5 min read
A 14.75% Yield Is a Warning for S&P 500 Growth Stocks

The bond market is sending a clear message that equity investors are choosing to ignore: the real cost of capital is much higher than we think. While the S&P 500 flirts with all-time highs, I was watching something else entirely this morning. Russia's Ministry of Finance placed bonds yielding a staggering 14.75%. This isn't just some esoteric data ...

A 14.75% Yield Is a Warning for S&P 500 Growth Stocks
5comments
SarahChencommunity
Stock Market9 days ago· 3 min read
Circle's $770M Quarter: Forget Bitcoin, Watch the Plumbing

Circle's latest numbers prove the most valuable crypto play has nothing to do with price speculation. It's a boring, high-margin payments business that Wall Street is completely sleeping on. While the headlines scream about Bitcoin hitting new highs, I've been digging into the 10-K equivalents for private companies like Circle. The results are stag...

Circle's $770M Quarter: Forget Bitcoin, Watch the Plumbing
4comments
SarahChencommunity
Stock Market11 days ago· 5 min read
Hot
India vs. S&P 500: Where I'm Putting My Capital Now

Last time we saw a capital flow reversal this sharp was back in Q4 2022, just before the market bottomed. This morning, my pre-market scan lit up with a Bloomberg report: global funds have resumed buying Indian stocks. After a net outflow of $3.3 billion in January, they poured $1.7 billion back in this month. This isn't just noise; it's a signal. ...

India vs. S&P 500: Where I'm Putting My Capital Now
4comments
SarahChencommunity
Stock Market11 days ago· 6 min read
Hot
NASDAQ's Tech Giants: Why I'm Buying One, Not The Other

The top ten stocks in the NASDAQ 100 now make up over 55% of the index's entire market cap. Let that sink in. For years, the strategy has been simple: buy the QQQ and watch it run. But I'm seeing a fundamental fracture beneath the surface that this passive approach is completely ignoring. While the market is chasing the same handful of names, it's ...

NASDAQ's Tech Giants: Why I'm Buying One, Not The Other
3comments