MainStay S&P 500 Index Fund Investor Class (MYSPX) NASDAQ
Currency In USD
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Currency In USD
If you invested $1000 in MainStay S&P 500 Index Fund Investor Class (MYSPX) 10 years ago, it would be worth $3,791.31 as of June 23, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $1,774.08, while $1000 invested 1 year ago would be worth $1,246.51. This corresponds to total returns of 279.13%, 77.41%, 24.65%, respectively, with annualized returns of 14.25%, 12.14%, 24.65%.
Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.
Date Range:
| Date | Open | Close | Adj Close | High | Low | Volume |
|---|---|---|---|---|---|---|
| June 22, 2026 | 79.69 | 79.69 | 79.69 | 79.69 | 79.69 | 0 |
| June 18, 2026 | 78.83 | 78.83 | 78.83 | 78.83 | 78.83 | 0 |
| June 17, 2026 | 79.79 | 79.79 | 79.79 | 79.79 | 79.79 | 0 |
| June 16, 2026 | 80.25 | 80.25 | 80.25 | 80.25 | 80.25 | 0 |
| June 15, 2026 | 78.93 | 78.93 | 78.93 | 78.93 | 78.93 | 0 |
| June 12, 2026 | 78.93 | 78.93 | 78.93 | 78.93 | 78.93 | 0 |
| June 11, 2026 | 78.53 | 78.53 | 78.53 | 78.53 | 78.53 | 0 |
| June 10, 2026 | 78.45 | 78.45 | 78.45 | 78.45 | 78.45 | 0 |
| June 09, 2026 | 78.65 | 78.65 | 78.65 | 78.65 | 78.65 | 0 |
| June 08, 2026 | 78.42 | 78.42 | 78.42 | 78.42 | 78.42 | 0 |
| June 05, 2026 | 80.54 | 80.54 | 80.54 | 80.54 | 80.54 | 0 |
| June 04, 2026 | 80.2 | 80.2 | 80.2 | 80.2 | 80.2 | 0 |
| June 03, 2026 | 80.8 | 80.8 | 80.8 | 80.8 | 80.8 | 0 |
| June 02, 2026 | 80.8 | 80.8 | 80.8 | 80.8 | 80.8 | 0 |
| June 01, 2026 | 80.48 | 80.48 | 80.48 | 80.48 | 80.48 | 0 |
| May 29, 2026 | 80.3 | 80.3 | 80.3 | 80.3 | 80.3 | 0 |
| May 28, 2026 | 79.84 | 79.84 | 79.84 | 79.84 | 79.84 | 0 |
| May 27, 2026 | 79.83 | 79.83 | 79.83 | 79.83 | 79.83 | 0 |
| May 26, 2026 | 79.35 | 79.35 | 79.35 | 79.35 | 79.35 | 0 |
| May 22, 2026 | 79.05 | 79.05 | 79.05 | 79.05 | 79.05 | 0 |
| May 21, 2026 | 78.91 | 78.91 | 78.91 | 78.91 | 78.91 | 0 |
| May 20, 2026 | 78.07 | 78.07 | 78.07 | 78.07 | 78.07 | 0 |
| May 19, 2026 | 78.59 | 78.59 | 78.59 | 78.59 | 78.59 | 0 |
| May 18, 2026 | 78.64 | 78.64 | 78.64 | 78.64 | 78.64 | 0 |
| May 15, 2026 | 79.61 | 79.61 | 79.61 | 79.61 | 79.61 | 0 |
| May 14, 2026 | 79.01 | 79.01 | 79.01 | 79.01 | 79.01 | 0 |
| May 13, 2026 | 78.55 | 78.55 | 78.55 | 78.55 | 78.55 | 0 |
| May 12, 2026 | 78.55 | 78.55 | 78.55 | 78.55 | 78.55 | 0 |
| May 11, 2026 | 78.52 | 78.52 | 78.52 | 78.52 | 78.52 | 0 |
| May 08, 2026 | 77.86 | 77.86 | 77.86 | 77.86 | 77.86 | 0 |
| May 07, 2026 | 78.16 | 78.16 | 78.16 | 78.16 | 78.16 | 0 |
| May 06, 2026 | 78.16 | 78.16 | 78.16 | 78.16 | 78.16 | 0 |
| May 05, 2026 | 77.04 | 77.04 | 77.04 | 77.04 | 77.04 | 0 |
| May 04, 2026 | 76.73 | 76.73 | 76.73 | 76.73 | 76.73 | 0 |
| May 01, 2026 | 76.5 | 76.5 | 76.5 | 76.5 | 76.5 | 0 |
| April 30, 2026 | 75.73 | 75.73 | 75.73 | 75.73 | 75.73 | 0 |
| April 29, 2026 | 75.76 | 75.76 | 75.76 | 75.76 | 75.76 | 0 |
| April 28, 2026 | 76.13 | 76.13 | 76.13 | 76.13 | 76.13 | 0 |
| April 27, 2026 | 76.13 | 76.13 | 76.13 | 76.13 | 76.13 | 0 |
| April 24, 2026 | 75.44 | 75.44 | 75.44 | 75.44 | 75.44 | 0 |
| April 23, 2026 | 75.75 | 75.75 | 75.75 | 75.75 | 75.75 | 0 |
| April 22, 2026 | 75.75 | 75.75 | 75.75 | 75.75 | 75.75 | 0 |
| April 21, 2026 | 75.45 | 75.45 | 75.45 | 75.45 | 75.45 | 0 |
| April 20, 2026 | 75.63 | 75.63 | 75.63 | 75.63 | 75.63 | 0 |
| April 17, 2026 | 74.73 | 74.73 | 74.73 | 74.73 | 74.73 | 0 |
| April 16, 2026 | 74.54 | 74.54 | 74.54 | 74.54 | 74.54 | 0 |
| April 15, 2026 | 73.95 | 73.95 | 73.95 | 73.95 | 73.95 | 0 |
| April 14, 2026 | 73.08 | 73.08 | 73.08 | 73.08 | 73.08 | 0 |
| April 13, 2026 | 73.08 | 73.08 | 73.08 | 73.08 | 73.08 | 0 |
| April 10, 2026 | 72.43 | 72.43 | 72.43 | 72.43 | 72.43 | 0 |
| April 09, 2026 | 71.98 | 71.98 | 71.98 | 71.98 | 71.98 | 0 |
| April 08, 2026 | 70.22 | 70.22 | 70.22 | 70.22 | 70.22 | 0 |
| April 07, 2026 | 70.22 | 70.22 | 70.22 | 70.22 | 70.22 | 0 |
| April 06, 2026 | 69.86 | 69.86 | 70.17 | 69.86 | 69.86 | 0 |
| April 02, 2026 | 69.78 | 69.78 | 69.86 | 69.78 | 69.78 | 0 |
| April 01, 2026 | 69.28 | 69.28 | 69.78 | 69.28 | 69.28 | 0 |
| March 31, 2026 | 67.32 | 67.32 | 69.28 | 67.32 | 67.32 | 0 |
| March 30, 2026 | 67.59 | 67.59 | 67.32 | 67.59 | 67.59 | 0 |
| March 27, 2026 | 68.74 | 68.74 | 67.59 | 68.74 | 68.74 | 0 |
| March 26, 2026 | 69.95 | 69.95 | 68.74 | 69.95 | 69.95 | 0 |