SEC Insider Transactions from Horn David R..

Last updated: 2026-03-14 11:51 UTC | Total transactions: 29

David R. Horn, President and CFO of Seer, Inc. ($SEER), sold shares on the open market four times in the last year, totaling about $57,000. His most recent sale occurred on February 18, 2026. These sales rank him 10,264th among 11,678 insiders by total value sold, well below the average of $8.6 million across about 6.4 transactions per insider. Horn made no open market purchases 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
Feb. 18, 2026 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO S Class A Common Stock 7743 $1.99 501,262.0000 55,786,344 1.52% 0.01%
Feb. 3, 2026 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO A Employee Stock Option (right to buy) 119000 $0.00 119,000.0000 55,786,344 9999.99% 0.21%
Feb. 3, 2026 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO A Class A Common Stock 79000 $0.00 509,005.0000 55,786,344 18.37% 0.14%
Nov. 19, 2025 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO S Class A Common Stock 6797 $1.97 436,802.0000 55,786,344 1.53% 0.01%
Aug. 20, 2025 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO S Class A Common Stock 6827 $2.04 436,802.0000 56,328,539 1.54% 0.01%
May 20, 2025 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO S Class A Common Stock 6760 $2.08 443,629.0000 59,430,035 1.50% 0.01%
Feb. 18, 2025 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO F Class A Common Stock 26572 $2.30 450,389.0000 59,128,092 5.57% 0.04%
Feb. 4, 2025 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO S Class A Common Stock 3550 $2.24 476,961.0000 59,128,092 0.74% 0.01%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 87 $0.00 0.0000 59,584,853 100.00% 0.00%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 87 $0.00 87.0000 59,584,853 9999.99% 0.00%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 20 $0.00 0.0000 59,584,853 100.00% 0.00%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 20 $0.00 20.0000 59,584,853 9999.99% 0.00%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 135100 $0.00 0.0000 59,584,853 100.00% 0.23%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 135100 $0.00 135,100.0000 59,584,853 9999.99% 0.23%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 34125 $0.00 0.0000 59,584,853 100.00% 0.06%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 34125 $0.00 34,125.0000 59,584,853 9999.99% 0.06%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 124000 $0.00 0.0000 59,584,853 100.00% 0.21%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 566460 $0.00 566,460.0000 59,584,853 9999.99% 0.95%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 140000 $0.00 0.0000 59,584,853 100.00% 0.23%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 140000 $0.00 140,000.0000 59,584,853 9999.99% 0.23%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 124000 $0.00 124,000.0000 59,584,853 9999.99% 0.21%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 140662 $0.00 0.0000 59,584,853 100.00% 0.24%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO A Employee Stock Option (right to buy) 140662 $0.00 140,662.0000 59,584,853 9999.99% 0.24%
Oct. 4, 2024 Seer, Inc. $SEER Horn David R. President & CFO D Employee Stock Option (right to buy) 566460 $0.00 0.0000 59,584,853 100.00% 0.95%
Feb. 6, 2024 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO A Class A Common Stock 165038 $0.00 493,195.0000 64,298,676 50.29% 0.26%
Feb. 6, 2024 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO A Employee Stock Option (right to buy) 142557 $0.00 142,557.0000 64,298,676 9999.99% 0.22%
Feb. 22, 2024 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO S Class A Common Stock 12684 $1.58 480,511.0000 64,298,676 2.57% 0.02%
Feb. 6, 2024 Seer, Inc. $SEER Horn David R. PRESIDENT & CFO A Employee Stock Option (right to buy) 140000 $0.00 140,000.0000 64,298,676 9999.99% 0.22%
Feb. 5, 2024 Seer, Inc. $SEER Horn David R. President and CFO S Class A Common Stock 3608 $1.67 328,157.0000 64,298,676 1.09% 0.01%