INSM monthly performance report
Explore INSM's monthly returns, drawdown, and seasonality trends — updated every month.
INSM monthly report
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Key takeaways
- Insmed Incorporated (INSM) closed September 2026 at $120.00, down 1.49% for the month and −17.73% over the trailing 12 months.
- Year-to-date, INSM is −31.05%, underperforming the S&P 500 which has returned +11.70% YTD.
- The stock is trading −14.21% versus its 200-day moving average ($139.88), a cautious technical signal.
- Over the past three years, INSM has outperformed the S&P 500 by +280.28%, with a relative strength index reading of 263.2.
- Win rate over the trailing 39 months stands at 46.2% — 18 positive months versus 21 negative months.
Insmed Incorporated ended September 2026 at $120.00, posting a monthly return of −1.49%. The S&P 500 returned −0.70% over the same window, leaving relative performance at −0.80%.
The current quarter stands at +12.55% (Q3 2026 (QTD)), while medium-term trend remains soft: price is −14.21% versus the 200-day moving average ($139.88).
Year-to-date, INSM is −31.05% against SPY +11.70%, a gap of −42.75%. The stock is currently −43.60% below its 52-week high, with maximum 3-year drawdown at −56.54%.
| Period | INSM | S&P 500 (SPY) | Excess return |
|---|---|---|---|
| 1 Day | −3.21% | −0.12% | −3.09% |
| 1 Week | −7.27% | −0.34% | −6.93% |
| 1 Month | −1.49% | −0.70% | −0.80% |
| 3 Months | +22.64% | +2.80% | +19.84% |
| 6 Months | −13.92% | +13.85% | −27.77% |
| YTD | −31.05% | +11.70% | −42.75% |
| 12 Months | −17.73% | +15.01% | −32.74% |
| 3 Years | +351.98% | +71.69% | +280.28% |
| Rank | Month | Return |
|---|---|---|
| #1 | May 2024 | +122.69% |
| #2 | Jun 2025 | +44.33% |
| #3 | Oct 2025 | +31.66% |
| #4 | Aug 2025 | +26.86% |
| #5 | Dec 2023 | +23.86% |
| Rank | Month | Return |
|---|---|---|
| #1 | May 2026 | −21.58% |
| #2 | Apr 2026 | −16.63% |
| #3 | Dec 2025 | −16.23% |
| #4 | Jan 2024 | −10.29% |
| #5 | Jan 2026 | −9.87% |
| Quarter | Return |
|---|---|
| Q2 2025 | +31.92% |
| Q3 2025 | +43.09% |
| Q4 2025 | +20.85% |
| Q1 2026 | −6.04% |
| Q2 2026 | −34.80% |
| Q3 2026 (QTD) | +12.55% |
| Year | Return |
|---|---|
| 2023 | +55.11% |
| 2024 | +122.78% |
| 2025 | +152.09% |
| 2026 | −31.05% |
| Metric | Value |
|---|---|
| 52-Week High | $212.75 (2025-12-02) |
| 52-Week Low | $90.39 (2026-06-10) |
| Current Price | $120.00 |
| 200-Day Moving Average | $139.88 |
| Price vs 200DMA | −14.21% |
| 3-Year Maximum Drawdown | −56.54% (2026-06-10) |
| Current Drawdown from 52W High | −43.60% |
| RS metric | Value |
|---|---|
| RS Index (3-year, rebased to 100) | 263.2 |
| 3-Year Excess Return vs S&P 500 | +280.28% |
| RS Peak | 519.3 (Dec 2025) |
| RS Trough | 69.4 (May 2024) |
| Status | Outperforming Benchmark |
Frequently asked questions
What was INSM's return for this report period?
INSM returned −1.49% in the latest monthly window ending 2026-09-18.
Has INSM outperformed SPY year to date?
YTD INSM: −31.05% vs SPY: +11.70%.
What is INSM's 12-month return?
−17.73% over the trailing 12 months.
Is INSM above or below its 200-day moving average?
Price is −14.21% versus 200DMA ($139.88).
What is the maximum drawdown in the 3-year window?
−56.54% on 2026-06-10.