Thomas J Seifert

CIK 1473289 · View on SEC EDGAR ↗

Insider

First SEC filing: Nov. 17, 2010 · Latest: Nov. 17, 2010

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Insider at

Insider transactions

0 buys (P) 40 sells (S) Net: $-32,751,720 + 38 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

38 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
Aug. 17, 2026 NET S 10b5-1 900 $305.25 $274,725 119,946 Direct -0.74% Disposed -6.9% (price as of 2026-08-20)
Aug. 17, 2026 NET S 10b5-1 2,944 $306.24 $901,571 117,002 Direct -2.45% Disposed -7.2% (price as of 2026-08-20)
Aug. 17, 2026 NET S 10b5-1 2,456 $307.29 $754,704 114,546 Direct -2.10% Disposed -7.5% (price as of 2026-08-20)
Aug. 17, 2026 NET S 10b5-1 3,100 $308.23 $955,513 111,446 Direct -2.71% Disposed -7.8% (price as of 2026-08-20)
Aug. 17, 2026 NET S 10b5-1 300 $309.07 $92,721 111,146 Direct -0.27% Disposed -8.0% (price as of 2026-08-20)
Aug. 17, 2026 NET S 10b5-1 200 $312.32 $62,464 110,946 Direct -0.18% Disposed -9.0% (price as of 2026-08-20)
Aug. 17, 2026 NET S 10b5-1 100 $314.61 $31,461 110,846 Direct -0.09% Disposed -9.6% (price as of 2026-08-20)
Aug. 4, 2026 NET S 10b5-1 53,861 $300.28 $16,173,381 114,929 Direct -31.91% Disposed -5.3% (price as of 2026-08-20)
Aug. 4, 2026 NET S 10b5-1 1,139 $301.00 $342,839 113,790 Direct -0.99% Disposed -5.5% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 300 $281.29 $84,387 113,790 Direct -0.26% Disposed 1.1% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 800 $279.91 $223,928 114,090 Direct -0.70% Disposed 1.6% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 1,201 $278.76 $334,791 114,890 Direct -1.03% Disposed 2.0% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 3,299 $277.68 $916,066 116,091 Direct -2.76% Disposed 2.4% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 1,741 $276.63 $481,613 119,390 Direct -1.44% Disposed 2.8% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 1,559 $275.79 $429,957 121,131 Direct -1.27% Disposed 3.1% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 500 $274.60 $137,300 122,690 Direct -0.41% Disposed 3.5% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 300 $270.50 $81,150 123,190 Direct -0.24% Disposed 5.1% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 100 $267.76 $26,776 123,490 Direct -0.08% Disposed 6.2% (price as of 2026-08-20)
July 17, 2026 NET S 10b5-1 200 $266.19 $53,238 123,590 Direct -0.16% Disposed 6.8% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 600 $235.34 $141,204 116,733 Direct -0.51% Disposed 20.8% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 2,633 $234.18 $616,596 117,333 Direct -2.19% Disposed 21.4% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 3,167 $233.44 $739,304 119,966 Direct -2.57% Disposed 21.8% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 600 $232.00 $139,200 123,133 Direct -0.48% Disposed 22.5% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 685 $230.90 $158,166 123,733 Direct -0.55% Disposed 23.1% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 515 $229.95 $118,424 124,418 Direct -0.41% Disposed 23.6% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 900 $228.91 $206,019 124,933 Direct -0.72% Disposed 24.2% (price as of 2026-08-20)
June 17, 2026 NET S 10b5-1 900 $227.74 $204,966 125,833 Direct -0.71% Disposed 24.8% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 100 $202.96 $20,296 137,486 Direct -0.07% Disposed 40.1% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 1,300 $202.31 $263,003 137,586 Direct -0.94% Disposed 40.5% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 1,703 $200.42 $341,315 138,886 Direct -1.21% Disposed 41.9% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 3,400 $199.75 $679,150 140,589 Direct -2.36% Disposed 42.3% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 2,700 $198.83 $536,841 143,989 Direct -1.84% Disposed 43.0% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 1,358 $197.65 $268,409 146,689 Direct -0.92% Disposed 43.8% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 600 $196.39 $117,834 148,047 Direct -0.40% Disposed 44.8% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 1,500 $195.55 $293,325 148,647 Direct -1.00% Disposed 45.4% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 1,900 $194.34 $369,246 150,147 Direct -1.25% Disposed 46.3% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 2,725 $193.50 $527,288 152,047 Direct -1.76% Disposed 46.9% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 8,666 $192.47 $1,667,945 154,772 Direct -5.30% Disposed 47.7% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 13,331 $191.45 $2,552,220 163,438 Direct -7.54% Disposed 48.5% (price as of 2026-08-20)
Nov. 20, 2025 NET S 10b5-1 2,272 $190.31 $432,384 176,769 Direct -1.27% Disposed 49.4% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 300 $93.02 $27,906 0 Indirect -100.00% Disposed 205.6% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 6,878 $92.08 $633,326 300 Indirect -95.82% Disposed 208.8% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 7,822 $91.47 $715,478 7,178 Indirect -52.15% Disposed 210.8% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 100 $93.38 $9,338 0 Indirect -100.00% Disposed 204.5% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 6,100 $92.13 $561,993 100 Indirect -98.39% Disposed 208.6% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 8,800 $91.50 $805,200 6,200 Indirect -58.67% Disposed 210.7% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 300 $93.06 $27,918 0 Indirect -100.00% Disposed 205.5% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 6,185 $92.09 $569,577 300 Indirect -95.37% Disposed 208.7% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 8,515 $91.49 $779,037 6,485 Indirect -56.77% Disposed 210.7% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 500 $93.08 $46,540 0 Indirect -100.00% Disposed 205.4% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 23,907 $92.08 $2,201,357 500 Indirect -97.95% Disposed 208.8% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 25,593 $91.47 $2,340,992 24,407 Indirect -51.19% Disposed 210.8% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 200 $93.13 $18,626 338,469 Direct -0.06% Disposed 205.3% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 6,411 $92.10 $590,453 338,669 Direct -1.86% Disposed 208.7% (price as of 2026-08-20)
March 15, 2024 NET S 10b5-1 8,389 $91.48 $767,426 345,080 Direct -2.37% Disposed 210.8% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 200 $115.69 $23,138 366,465 Direct -0.05% Disposed 145.7% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 2,017 $114.52 $230,987 366,665 Direct -0.55% Disposed 148.3% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 1,767 $113.55 $200,643 368,682 Direct -0.48% Disposed 150.4% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 7,240 $112.17 $812,111 370,449 Direct -1.92% Disposed 153.5% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 9,386 $111.20 $1,043,723 377,689 Direct -2.42% Disposed 155.7% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 13,500 $110.26 $1,488,510 387,075 Direct -3.37% Disposed 157.8% (price as of 2026-08-20)
Feb. 9, 2024 NET S 10b5-1 2,907 $108.92 $316,630 400,575 Direct -0.72% Disposed 161.0% (price as of 2026-08-20)

Showing latest 100 of 850 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
Aug. 17, 2026 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (10,000) $2.04 July 25, 2027 10,000 Disposed
Aug. 17, 2026 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Acquired
Aug. 17, 2026 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Disposed
Aug. 4, 2026 NET Performance Stock Option (right to buy) Class A Common Stock (55,000) $44.72 Feb. 13, 2032 55,000 Disposed
July 17, 2026 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Disposed
July 17, 2026 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Acquired
July 17, 2026 NET Employee Stock Option (right to buy) Class B Common Stock [F2] (10,000) $2.04 July 25, 2027 10,000 Disposed
June 17, 2026 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Disposed
June 17, 2026 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Acquired
June 17, 2026 NET Employee Stock Option (right to buy) Class B Common Stock [F3] (10,000) $2.04 July 25, 2027 10,000 Disposed
Nov. 20, 2025 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Disposed
Nov. 20, 2025 NET Class B Common Stock Class A Common Stock (10,000) 10,000 Acquired
Nov. 20, 2025 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (10,000) $2.04 July 25, 2027 10,000 Disposed
March 15, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
March 15, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
March 15, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
March 15, 2024 NET Class B Common Stock Class A Common Stock (50,000) 50,000 Disposed
March 15, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
March 15, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
March 15, 2024 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Feb. 9, 2024 NET Class B Common Stock Class A Common Stock (50,000) 50,000 Disposed
Feb. 9, 2024 NET Class B Common Stock Class A Common Stock (50,000) 50,000 Acquired
Feb. 9, 2024 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (50,000) $2.04 July 25, 2027 50,000 Disposed
Feb. 2, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Feb. 2, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Feb. 2, 2024 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Jan. 18, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Jan. 18, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Jan. 18, 2024 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Jan. 3, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Jan. 3, 2024 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Jan. 3, 2024 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Dec. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Dec. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Dec. 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Dec. 13, 2023 NET Class B Common Stock Class A Common Stock (34,329) 34,329 Disposed
Dec. 13, 2023 NET Class B Common Stock Class A Common Stock (34,329) 34,329 Acquired
Dec. 13, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (34,329) $2.04 July 25, 2027 34,329 Disposed
Dec. 6, 2023 NET Class B Common Stock Class A Common Stock (400) 400 Disposed
Dec. 6, 2023 NET Class B Common Stock Class A Common Stock (400) 400 Acquired
Dec. 6, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (400) $2.04 July 25, 2027 400 Disposed
Dec. 4, 2023 NET Class B Common Stock Class A Common Stock (30,271) 30,271 Disposed
Dec. 4, 2023 NET Class B Common Stock Class A Common Stock (30,271) 30,271 Acquired
Dec. 4, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (30,271) $2.04 July 25, 2027 30,271 Disposed
Nov. 17, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Nov. 17, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Nov. 17, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Nov. 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Nov. 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Nov. 3, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Oct. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Oct. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Oct. 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Oct. 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Oct. 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Oct. 3, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Sept. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Sept. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Sept. 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Sept. 5, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Sept. 5, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Sept. 5, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Aug. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Aug. 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Aug. 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
Aug. 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
Aug. 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
Aug. 3, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
July 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
July 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
July 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
July 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
July 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
July 3, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
June 20, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
June 20, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
June 20, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
June 5, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
June 5, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
June 5, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
May 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
May 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
May 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
May 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
May 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
May 3, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
May 1, 2023 NET Performance Stock Option (right to buy) Class A Common Stock (555,000) $105.56 Feb. 13, 2032 555,000 Disposed
May 1, 2023 NET Performance Stock Option (right to buy) Class A Common Stock (555,000) $44.72 Feb. 13, 2032 555,000 Acquired
April 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
April 18, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
April 18, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
April 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Disposed
April 3, 2023 NET Class B Common Stock Class A Common Stock (15,000) 15,000 Acquired
April 3, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (15,000) $2.04 July 25, 2027 15,000 Disposed
March 31, 2023 NET Class B Common Stock Class A Common Stock (44,782) 44,782 Disposed
March 31, 2023 NET Class B Common Stock Class A Common Stock (44,782) 44,782 Acquired
March 31, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (44,782) $2.04 July 25, 2027 44,782 Disposed
March 30, 2023 NET Class B Common Stock Class A Common Stock (5,218) 5,218 Disposed
March 30, 2023 NET Class B Common Stock Class A Common Stock (5,218) 5,218 Acquired
March 30, 2023 NET Employee Stock Option (right to buy) Class B Common Stock [F1] (5,218) $2.04 July 25, 2027 5,218 Disposed

Showing latest 100 of 320 transactions

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 4 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
Sept. 12, 2019 NET Class B Common Stock→ Class A Common Stock (512,225) 512,225 Direct
Sept. 12, 2019 NET Employee Stock Option (right to buy)→ Class B Common Stock [F1] (934,058) 934,058 Direct
Sept. 12, 2019 NET Employee Stock Option (right to buy)→ Class B Common Stock [F1] (1,446,283) 1,446,283 Direct
Oct. 16, 2009 AMD Common Stock 0 Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

AMD

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2012 $494,826 $0 $0 $63,057 $2,899,812
2011 $566,046 $746,000 $227,945 $14,902 $3,784,460
2010 $524,992 $207,506 $842,494 $139,629 $3,405,339

NET

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2025 $750,000 $10,741,505
2024 $741,667 $10,865,787
2023 $650,000 $3,579,519 $17,117,115

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.