Thesis and Universe
News-sentiment takes a straightforward approach: enter long positions when recent news flow around a stock turns positive, and exit when sentiment flips negative. The strategy scans a 24-name universe of large-cap US equities spanning technology (AAPL, MSFT, NVDA, GOOGL), financials (JPM, BAC, V, MA), healthcare (JNJ, UNH, PFE, ABBV), consumer staples and discretionary (PG, KO, WMT, COST, MCD, NKE, HD), energy (XOM, CVX), industrials (CAT, HON), and media (DIS). The universe is deliberately blue-chip — liquid, heavily covered, and news-rich. On paper, those qualities should make sentiment signals reliable.
Recent Activity
The strategy has been running daily since late May, but recent weeks have been almost entirely quiet. Every scheduled run from June 22 through June 29 logged zero trades executed and zero rejected. The book holds four open positions — AAPL (6 shares at $312.06), MSFT (4 shares at $428.23), BAC (35 shares at $55.93), and UNH (4 shares at $402.85) — all accumulated between May 31 and June 18. None have been exited. Cash stands at $2,810 against a total portfolio value that has ranged from $9,606 to $9,748 over the observed period, suggesting the existing holdings are roughly tracking the broader market without the strategy generating further signal.
The absence of exit signals is worth flagging. A strategy that buys on positive sentiment but never sells on negative sentiment either indicates the four holdings have not generated fresh negative news — or that the exit threshold is calibrated conservatively enough to rarely trigger. Without realized trades, the win rate remains undefined at 0.
Backtest and Validation
Over a 451-day backtest window, the strategy executed only 2 trades, generating a total return of +0.19%, a Sharpe ratio of 0.74, and a maximum drawdown of just 5%. Turnover was 36.5% and fees totalled $2 — a strikingly low-activity, low-cost profile.
The cross-validation picture is sobering. Across four walk-forward folds, only fold 4 produced any activity at all. Folds 1 through 3 — covering August 2024 through December 2025 — logged zero trades and zero return. Fold 4 (December 2025 to May 2026) delivered the entire backtest return with a Sharpe of 1.5, which is strong in isolation. The validation gate nonetheless failed: only 1 of 4 folds was positive, far short of any reasonable threshold for statistical robustness. The Probabilistic Sharpe Ratio (PSR) of 0.923 is encouraging, but the Deflated Sharpe Ratio (DSR) of 0.551 — which penalizes for multiple trials (6 in this run) — tells the more honest story.
Strengths
- Minimal drawdown (5%) suggests the strategy avoids chasing momentum into crowded entries.
- Fold 4 Sharpe of 1.5 demonstrates the signal can work under the right market conditions.
- High PSR (0.923) indicates the observed Sharpe is unlikely to be a pure statistical artifact.
- Low fees and turnover keep frictional drag negligible.
Risks and Open Questions
- Signal sparsity is the central concern. A strategy that fired zero times across 17 months of the backtest cannot be meaningfully validated, regardless of how well fold 4 looked.
- DSR of 0.551 reflects that with 6 trials, the adjusted signal quality remains weak.
- No exits recorded. The strategy holds four open positions with no evidence of the exit logic triggering. If negative-sentiment exits are as rare as buy entries, the strategy may effectively become a buy-and-hold wrapper.
- Market regime dependency. All signal activity is concentrated in fold 4. Whether that reflects a structural improvement in news-data quality, a shift in market behavior, or luck is unclear without more trades.
Outlook
News-sentiment is worth watching but not ready for increased allocation. The priority should be diagnosing why the signal was silent for the first three folds — whether a data coverage gap, a threshold miscalibration, or genuine absence of sentiment events. More trades, more folds with positive returns, and a rising DSR are the milestones that would justify higher confidence.