| N-CSRS | Certified semi-annual shareholder report... | Sit Mid Cap Growth Fund Inc | DONNELLEY FINANCIAL SOLUTIONS /FA/ | 02/24/2026 | |
| NPORT-P | Monthly Portfolio Investments Report on ... | | BNY MELLON INVESTMENT SERVICING (US) INC. /fa | 02/23/2026 | |
| NPORT-P | Monthly Portfolio Investments Report on ... | | BNY MELLON INVESTMENT SERVICING (US) INC. /fa | 11/25/2025 | |
| 40-17G | Fidelity bond filed pursuant to Rule 17g... | SIT LARGE CAP GROWTH FUND INC , SIT MID CAP GROWTH FUND INC , SIT MUTUAL FUNDS II INC , SIT U S GOVERNMENT SECURITIES FUND INC , SIT MUTUAL FUNDS INC | AMERICAN FINANCIAL PRINTING INC /fa | 11/21/2025 | |
| 485BPOS | Post-effective amendment filed pursuant ... | SIT MID CAP GROWTH FUND INC , SIT MID CAP GROWTH FUND INC | DONNELLEY FINANCIAL SOLUTIONS /FA/ | 10/29/2025 | |
| 497K | Summary Prospectus for certain open-end ... | Sit Mid Cap Growth Fund Inc | DONNELLEY FINANCIAL SOLUTIONS /FA/ | 10/29/2025 | |
| N-CEN | Annual Report for Registered Investment ... | | Confluence Technologies Inc /fa | 09/04/2025 | |
| N-CSR | Certified annual shareholder report of r... | Sit Mid Cap Growth Fund Inc | DONNELLEY FINANCIAL SOLUTIONS /FA/ | 08/27/2025 | |
| NPORT-P | Monthly Portfolio Investments Report on ... | | Confluence Technologies Inc /fa | 08/25/2025 | |
| N-PX | Annual Report of Proxy Voting Record of ... | | SIT MID CAP GROWTH FUND INC /fa | 08/19/2025 | |
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