Mark Jeffrey Delong serves as Executive at Apellis Pharmaceuticals, Inc., where they oversee executive responsibilities. Since joining the company, Mark Jeffrey Delong has executed 48 insider transactions totaling $4.3M, demonstrating a bearish approach to their equity position. Their most recent transaction on Jan 28, 2026 involved receiving (via award) 36,606 shares valued at $0.
Mark Jeffrey Delong currently holds 114,959 shares of Apellis Pharmaceuticals, Inc. (APLS), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Mark Jeffrey Delong has been a net seller of APLS stock. They have purchased $0 and sold $4.3M worth of shares.
Mark Jeffrey Delong's most recent insider trade was on Jan 28, 2026, when they sold 36,606 shares at $0.00 per share.
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| $19.79 |
| Discretionary |
| Aug 12, 2024 | APLS | $72.0K | Option Exercise | 5,201 | $13.85 | Planned |
| Mar 18, 2024 | APLS | $564.0K | Sale | 9,913 | $56.90 | Discretionary |
| Feb 12, 2024 | APLS | $40.5K | Sale | 597 | $67.77 | Discretionary |
| Jan 29, 2024 | APLS | $23.5K | Sale | 367 | $64.14 | Discretionary |
| Jan 22, 2024 | APLS | $90.0K | Sale | 1,384 | $65.00 | Discretionary |
| Jan 16, 2024 | APLS | $0 | Award | 16,963 | $N/A | Discretionary |
| Jan 16, 2024 | APLS | $109.0K | Sale | 1,631 | $66.81 | Discretionary |
| Oct 23, 2023 | APLS | $6.0K | Sale | 131 | $46.04 | Discretionary |
| Feb 21, 2023 | APLS | $0 | Award | 5,280 | $N/A | Discretionary |
| Feb 21, 2023 | APLS | $25.8K | Payment | 441 | $58.50 | Discretionary |
| Feb 10, 2023 | APLS | $34.3K | Payment | 670 | $51.21 | Discretionary |
| Jan 27, 2023 | APLS | $19.4K | Payment | 367 | $52.77 | Discretionary |
| Jan 20, 2023 | APLS | $59.8K | Payment | 1,149 | $52.05 | Discretionary |
| Jan 12, 2023 | APLS | $0 | Award | 19,634 | $N/A | Discretionary |
| Oct 20, 2022 | APLS | $11.4K | Payment | 196 | $58.00 | Discretionary |
| Aug 17, 2022 | APLS | $347.5K | Sale | 5,000 | $69.50 | Discretionary |
| Aug 17, 2022 | APLS | $77.6K | Option Exercise | 5,000 | $15.52 | Discretionary |
| Aug 11, 2022 | APLS | $335.0K | Sale | 5,000 | $67.00 | Discretionary |
| Aug 11, 2022 | APLS | $77.6K | Option Exercise | 5,000 | $15.52 | Discretionary |
| Aug 8, 2022 | APLS | $77.6K | Option Exercise | 5,000 | $15.52 | Discretionary |
| Aug 8, 2022 | APLS | $322.5K | Sale | 5,000 | $64.50 | Discretionary |
| Aug 4, 2022 | APLS | $310.0K | Sale | 5,000 | $62.00 | Discretionary |
| Aug 4, 2022 | APLS | $297.5K | Sale | 5,000 | $59.50 | Discretionary |
| Aug 4, 2022 | APLS | $155.2K | Option Exercise | 10,000 | $15.52 | Discretionary |
| Jul 27, 2022 | APLS | $285.0K | Sale | 5,000 | $57.00 | Discretionary |
| Jul 27, 2022 | APLS | $77.6K | Option Exercise | 5,000 | $15.52 | Discretionary |
| Jul 19, 2022 | APLS | $282.1K | Sale | 5,000 | $56.42 | Discretionary |
| Jul 19, 2022 | APLS | $77.6K | Option Exercise | 5,000 | $15.52 | Discretionary |