Company: MYI
Filing Date: 2025-09-05
Form Type: 424B3
Source: 0001193125-25-196285
Chunk: 239

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-05
Form: 424B3
Chunk 239
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| MVF                  |     | Common Shares  |     | 150,000,000 |     |            0 |     |   57,335,699 |
| Acquiring Fund (MYI) |     | Common Shares  |     | 199,973,636 |     |            0 |     |   66,467,251 |

132

Common Share Price Data The following tables set forth the high and low market prices for common shares of each Fund on the NYSE for each full quarterly period within each Fund’s two most recent fiscal years and each full quarter since the beginning of each Fund’s current fiscal year, along with the NAV and discount or premium to NAV for each quotation.

| MVT                  
 During Quarter Ended 
 July 31, 2025        |     | NYSE Market Price 
 Per Common Share  
 High              | 10.39 |     | Low |  9.90 |     | NAV per Common Share on 
 Date of Market Price    
 High                    | 11.46 |     | Low | 10.81 |     | Premium/(Discount)      
 on Date of Market Price 
 High                    |  -9.34 | % |     | Low |  -8.42 | % |     | Trading Volume | 3,239,186 |
|:---------------------|:----|:------------------|------:|:----|:----|------:|:----|:------------------------|------:|:----|:----|------:|:----|:------------------------|-------:|:--|:----|:----|-------:|:--|:----|:---------------|----------:|
| April 30, 2025       |     | $                 | 11.04 |     | $   |  9.81 |     | $                       | 12.16 |     | $   | 11.20 |     |                         |  -9.21 | % |     |     | -12.41 | % |     |                | 3,273,082 |
| January 31 2025      |     | $                 | 11.27 |     | $   | 10.43 |     | $                       | 12.53 |     | $   | 12.01 |     |                         | -10.06 | % |     |     | -13.16 | % |     |                | 5,426