Michael G. Grey sold Mirum Pharmaceuticals ($MIRM) shares on the open market three times in the last year, totaling $11.1 million. His most recent sale occurred on December 19, 2025. These sales rank 1,043rd among 11,678 individual insiders in our database, where the average is $8.6 million across about 6.4 transactions per insider. Grey made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 19, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | S | Common Stock | 50000 | $78.00 | 280,160.0000 | 56,993,841 | 15.14% | 0.09% |
| Dec. 19, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | M | Common Stock | 50000 | $2.94 | 330,160.0000 | 56,993,841 | 17.85% | 0.09% |
| Dec. 19, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | M | Stock Option (right to buy) | 50000 | $0.00 | 181,176.0000 | 56,993,841 | 21.63% | 0.09% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 400 | $0.00 | 400.0000 | 1,070,370 | 9999.99% | 0.04% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | D | Stock Option (Right to Buy) | 666 | $0.00 | 0.0000 | 1,070,370 | 100.00% | 0.06% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 666 | $0.00 | 666.0000 | 1,070,370 | 9999.99% | 0.06% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | D | Stock Option (right to buy) | 133 | $0.00 | 0.0000 | 1,070,370 | 100.00% | 0.01% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (right to buy) | 133 | $0.00 | 133.0000 | 1,070,370 | 9999.99% | 0.01% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | D | Stock Option (Right to Buy) | 1499 | $0.00 | 0.0000 | 1,070,370 | 100.00% | 0.14% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 1499 | $0.00 | 1,499.0000 | 1,070,370 | 9999.99% | 0.14% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | D | Stock Option (Right to Buy) | 1255 | $0.00 | 0.0000 | 1,070,370 | 100.00% | 0.12% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 1255 | $0.00 | 1,255.0000 | 1,070,370 | 9999.99% | 0.12% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | D | Stock Option (Right to Buy) | 387 | $0.00 | 0.0000 | 1,070,370 | 100.00% | 0.04% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 387 | $0.00 | 387.0000 | 1,070,370 | 9999.99% | 0.04% |
| Dec. 11, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | D | Stock Option (Right to Buy) | 400 | $0.00 | 0.0000 | 1,070,370 | 100.00% | 0.04% |
| Dec. 1, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | S | Common Stock | 50000 | $74.00 | 280,160.0000 | 56,993,841 | 15.14% | 0.09% |
| Dec. 1, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | M | Common Stock | 50000 | $2.94 | 330,160.0000 | 56,993,841 | 17.85% | 0.09% |
| Dec. 1, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | M | Stock Option (right to buy) | 50000 | $0.00 | 231,176.0000 | 56,993,841 | 17.78% | 0.09% |
| Nov. 21, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | M | Common Stock | 50000 | $2.94 | 330,160.0000 | 56,993,841 | 17.85% | 0.09% |
| Nov. 21, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | M | Stock Option (right to buy) | 50000 | $0.00 | 281,176.0000 | 56,993,841 | 15.10% | 0.09% |
| Nov. 21, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | S | Common Stock | 50000 | $70.00 | 280,160.0000 | 56,993,841 | 15.14% | 0.09% |
| July 22, 2025 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 30000 | $0.00 | 30,000.0000 | 42,231,285 | 9999.99% | 0.07% |
| May 29, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | A | Deferred Stock Units | 3977 | $0.00 | 3,977.0000 | 47,522,594 | 9999.99% | 0.01% |
| May 29, 2025 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | A | Stock Option (right to buy) | 6268 | $0.00 | 6,268.0000 | 47,522,594 | 9999.99% | 0.01% |
| May 28, 2025 | OnKure Therapeutics, Inc. | $OKUR | GREY MICHAEL G | Not found | A | Stock Option (right to buy) | 7650 | $0.00 | 7,650.0000 | 3,447,071 | 9999.99% | 0.22% |
| Oct. 4, 2024 | OnKure Therapeutics, Inc. | $OKUR | GREY MICHAEL G | Not found | A | Stock Option (right to buy) | 15300 | $0.00 | 15,300.0000 | 316,142 | 9999.99% | 4.84% |
| Sept. 27, 2024 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | G | Common Stock | 102788 | $0.00 | 280,160.0000 | 40,885,124 | 26.84% | 0.25% |
| June 5, 2024 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | A | Deferred Stock Units | 5703 | $0.00 | 5,703.0000 | 40,885,124 | 9999.99% | 0.01% |
| June 5, 2024 | Mirum Pharmaceuticals, Inc. | $MIRM | GREY MICHAEL G | Not found | A | Stock Option (right to buy) | 8779 | $0.00 | 8,779.0000 | 40,885,124 | 9999.99% | 0.02% |
| May 22, 2024 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 30000 | $0.00 | 30,000.0000 | 0 | 9999.99% | 0.00% |
| July 26, 2023 | OnKure Therapeutics, Inc. | $OKUR | GREY MICHAEL G | Executive Chairman | G | Common Stock | 50000 | $0.00 | 628,846.0000 | 0 | 7.37% | 0.00% |
| June 6, 2023 | OnKure Therapeutics, Inc. | $OKUR | GREY MICHAEL G | Executive Chairman | A | Stock Option (right to buy) | 17500 | $0.00 | 17,500.0000 | 0 | 9999.99% | 0.00% |
| May 25, 2023 | SPRUCE BIOSCIENCES, INC. | $SPRB | GREY MICHAEL G | Executive Chairman | A | Stock Option (Right to Buy) | 30000 | $0.00 | 30,000.0000 | 0 | 9999.99% | 0.00% |