SEC Insider Transactions from HEIDEN WILLIAM K.

Last updated: 2026-03-14 11:21 UTC | Total transactions: 17

William K. Heiden, a director at MacroGenics Inc. ($MGNX), made two open market purchases of company shares in the last 365 days, totaling about $151,000. His most recent buy occurred on August 20, 2025. These purchases rank him 1809th among nearly 5,000 individual insiders by purchase value, below the average of $1.46 million across about 3.3 transactions per insider. Heiden reported no open market sales during this period.

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Transaction Date Company Ticker Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
Aug. 20, 2025 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director P Common Stock 49500 $1.49 111,000.0000 62,621,185 80.49% 0.08%
Aug. 19, 2025 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director P Common Stock 50500 $1.52 61,500.0000 62,621,185 459.09% 0.08%
June 10, 2025 Atara Biotherapeutics, Inc. $ATRA HEIDEN WILLIAM K Not found A Common Stock 7828 $0.00 22,188.0000 7,488,000 54.51% 0.10%
May 21, 2025 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director A Restricted Stock Unit 3750 $0.00 3,750.0000 62,621,185 9999.99% 0.01%
May 21, 2025 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director A Stock Option (right to buy) 22000 $0.00 22,000.0000 62,621,185 9999.99% 0.04%
May 20, 2025 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director M Common Stock 6500 $0.00 11,000.0000 62,621,185 144.44% 0.01%
May 20, 2025 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director M Restricted Stock Unit 6500 $0.00 0.0000 62,621,185 100.00% 0.01%
May 21, 2024 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director A Restricted Stock Unit 6500 $0.00 6,500.0000 61,929,198 9999.99% 0.01%
May 21, 2024 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director A Stock Option (right to buy) 16500 $0.00 16,500.0000 61,929,198 9999.99% 0.03%
May 20, 2024 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director M Common Stock 4500 $0.00 4,500.0000 61,929,198 9999.99% 0.01%
May 20, 2024 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director M Restricted Stock Unit 4500 $0.00 0.0000 61,929,198 100.00% 0.01%
March 31, 2024 Atara Biotherapeutics, Inc. $ATRA HEIDEN WILLIAM K Not found A Common Stock 150000 $0.00 359,000.0000 4,236,000 71.77% 3.54%
Nov. 10, 2023 Atara Biotherapeutics, Inc. $ATRA HEIDEN WILLIAM K Not found P Common Stock 100000 $0.25 209,000.0000 0 91.74% 0.00%
May 31, 2023 Atara Biotherapeutics, Inc. $ATRA HEIDEN WILLIAM K Not found A Common Stock 57000 $0.00 109,000.0000 0 109.62% 0.00%
May 31, 2023 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director A Restricted Stock Unit 4500 $0.00 4,500.0000 61,433,124 9999.99% 0.01%
May 31, 2023 Atara Biotherapeutics, Inc. $ATRA HEIDEN WILLIAM K Not found A Non-Qualified Stock Option (Right to Buy) 79500 $0.00 79,500.0000 0 9999.99% 0.00%
May 31, 2023 MACROGENICS INC $MGNX HEIDEN WILLIAM K Director A Stock Option (right to buy) 19000 $0.00 19,000.0000 61,433,124 9999.99% 0.03%