Robert K. Zeldin serves as Executive at ACCELERON PHARMA INC, where they oversee executive responsibilities. Since joining the company, Robert K. Zeldin has executed 20 insider transactions totaling $39.5K, demonstrating a bullish approach to their equity position. Their most recent transaction on Feb 21, 2026 involved exercising options for 7,500 shares valued at $0.
Robert K. Zeldin currently holds 7,500 shares of ACCELERON PHARMA INC (XLRN), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Robert K. Zeldin has been a net buyer of XLRN stock. They have purchased $39.5K and sold $0 worth of shares.
Robert K. Zeldin's most recent insider trade was on Feb 21, 2026, when they sold 7,500 shares at $0.00 per share.
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| $7.45 |
| Discretionary |
| Feb 21, 2026 | MGTX | $0 | Option Exercise | 7,500 | $N/A | Discretionary |
| Jan 17, 2026 | MGTX | $0 | Option Exercise | 35,000 | $N/A | Discretionary |
| Jan 17, 2026 | MGTX | $103.5K | Payment | 13,951 | $7.42 | Discretionary |
| Jan 17, 2026 | MGTX | $0 | Option Exercise | 35,000 | $N/A | Discretionary |
| Jan 7, 2026 | MGTX | $0 | Option Exercise | 17,500 | $N/A | Discretionary |
| Jan 7, 2026 | MGTX | $52.0K | Payment | 6,729 | $7.73 | Discretionary |
| Jan 7, 2026 | MGTX | $0 | Option Exercise | 17,500 | $N/A | Discretionary |
| Jan 14, 2024 | MGTX | $93.8K | Payment | 14,756 | $6.36 | Discretionary |
| Jan 14, 2024 | MGTX | $0 | Option Exercise | 37,500 | $N/A | Discretionary |
| Jan 7, 2024 | MGTX | $0 | Option Exercise | 35,000 | $N/A | Discretionary |
| Jan 7, 2024 | MGTX | $116.6K | Payment | 18,507 | $6.30 | Discretionary |
| Jan 7, 2024 | MGTX | $86.8K | Payment | 13,773 | $6.30 | Discretionary |
| Jan 14, 2023 | MGTX | $0 | Option Exercise | 75,000 | $N/A | Discretionary |
| Jan 14, 2023 | MGTX | $206.3K | Payment | 29,513 | $6.99 | Discretionary |
| Jun 3, 2022 | MGTX | $39.5K | Purchase | 4,994 | $7.90 | Discretionary |
| Jun 3, 2022 | MGTX | $47 | Purchase | 6 | $7.89 | Discretionary |
| Jan 25, 2019 | XLRN | $0 | Award | 2,200 | $N/A | Discretionary |
| Jul 2, 2018 | XLRN | $0 | Award | 16,903 | $N/A | Discretionary |