John B Walker

CIK 1374442 · View on SEC EDGAR ↗

Insider

First SEC filing: Aug. 10, 2018 · Latest: Aug. 10, 2018

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Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 35 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

35 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
Sept. 23, 2024 MGY S 500,000 $25.86 $12,930,000 5,523,479 Indirect -8.30% Disposed 6.2% (price as of 2026-08-19)
Sept. 23, 2024 MGY S 7,000,000 $25.86 $181,020,000 2,099,403 Indirect -76.93% Disposed 6.2% (price as of 2026-08-19)
May 14, 2024 MGY S 3,000,000 $25.58 $76,740,000 10,957,921 Indirect -21.49% Disposed 7.3% (price as of 2026-08-19)
May 14, 2024 MGY S 12,000,000 $25.58 $306,960,000 4,164,961 Indirect -74.23% Disposed 7.3% (price as of 2026-08-19)
Nov. 8, 2022 MGY S 2,000,000 $24.26 $48,520,000 21,826,805 Indirect -8.39% Disposed 13.2% (price as of 2026-08-19)
Nov. 8, 2022 MGY S 7,500,000 $24.26 $181,950,000 8,296,077 Indirect -47.48% Disposed 13.2% (price as of 2026-08-19)
June 6, 2022 MGY S 2,000,000 $27.01 $54,020,000 28,710,432 Indirect -6.51% Disposed 1.7% (price as of 2026-08-19)
June 6, 2022 MGY S 7,500,000 $27.01 $202,575,000 10,912,450 Indirect -40.73% Disposed 1.7% (price as of 2026-08-19)
March 14, 2022 MGY S 2,500,000 $21.72 $54,300,000 35,594,059 Indirect -6.56% Disposed 26.4% (price as of 2026-08-19)
March 14, 2022 MGY S 7,500,000 $21.72 $162,900,000 13,528,823 Indirect -35.67% Disposed 26.4% (price as of 2026-08-19)
Feb. 3, 2022 MGY S 10b5-1 550,815 $21.00 $11,567,115 16,282,900 Indirect -3.27% Disposed 30.8% (price as of 2026-08-19)
Feb. 3, 2022 MGY S 10b5-1 6,905,000 $21.00 $145,005,000 16,833,715 Indirect -29.09% Disposed 30.8% (price as of 2026-08-19)
Oct. 7, 2021 MGY S 10b5-1 5,000,000 $18.50 $92,500,000 18,735,406 Indirect -21.07% Disposed 48.4% (price as of 2026-08-19)
Sept. 28, 2021 MGY S 3,000,000 $16.38 $49,140,000 52,915,438 Indirect -5.37% Disposed 67.6% (price as of 2026-08-19)
Sept. 28, 2021 MGY S 7,500,000 $16.38 $122,850,000 20,112,444 Indirect -27.16% Disposed 67.6% (price as of 2026-08-19)
June 18, 2021 MGY S 5,000,000 $14.35 $71,750,000 60,523,656 Indirect -7.63% Disposed 91.4% (price as of 2026-08-19)
June 18, 2021 MGY S 7,600,000 $14.35 $109,060,000 23,004,226 Indirect -24.83% Disposed 91.4% (price as of 2026-08-19)
March 5, 2021 MGY S 5,000,000 $10.16 $50,800,000 66,624,035 Indirect -6.98% Disposed 170.3% (price as of 2026-08-19)
March 5, 2021 MGY S 19,550,000 $10.16 $198,628,000 29,503,847 Indirect -39.85% Disposed 170.3% (price as of 2026-08-19)
Sept. 12, 2018 MGY P 50,000 $14.00 $700,000 160,000 Direct +45.45% Acquired 96.1% (price as of 2026-08-19)
Sept. 11, 2018 MGY P 40,000 $13.76 $550,400 110,000 Direct +57.14% Acquired 99.6% (price as of 2026-08-19)
Sept. 10, 2018 MGY P 70,000 $13.59 $951,300 70,000 Direct — Acquired 102.1% (price as of 2026-08-19)

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
Sept. 23, 2024 MGY Class B Common Stock Class A Common Stock — — 500,000 Disposed
Sept. 23, 2024 MGY Class B Common Stock Class A Common Stock — — 4,934,442 Disposed
May 14, 2024 MGY Class B Common Stock Class A Common Stock — — 3,000,000 Disposed
May 14, 2024 MGY Class B Common Stock Class A Common Stock — — 7,868,884 Disposed
Nov. 8, 2022 MGY Class B Common Stock Class A Common Stock — — 2,000,000 Disposed
Nov. 8, 2022 MGY Class B Common Stock Class A Common Stock — — 4,883,627 Disposed
June 6, 2022 MGY Class B Common Stock Class A Common Stock — — 2,000,000 Disposed
June 6, 2022 MGY Class B Common Stock Class A Common Stock — — 4,883,627 Disposed
March 14, 2022 MGY Class B Common Stock Class A Common Stock — — 2,500,000 Disposed
March 14, 2022 MGY Class B Common Stock Class A Common Stock — — 4,745,923 Disposed
Feb. 3, 2022 MGY Class B Common Stock Class A Common Stock — — 1,449,185 Disposed
Feb. 3, 2022 MGY Class B Common Stock Class A Common Stock — — 5,003,309 Disposed
Oct. 7, 2021 MGY Class B Common Stock Class A Common Stock — — 3,622,962 Disposed
Sept. 28, 2021 MGY Class B Common Stock Class A Common Stock — — 3,000,000 Disposed
Sept. 28, 2021 MGY Class B Common Stock Class A Common Stock — — 4,608,218 Disposed
June 18, 2021 MGY Class B Common Stock Class A Common Stock — — 5,000,000 Disposed
June 18, 2021 MGY Class B Common Stock Class A Common Stock — — 1,100,379 Disposed
March 5, 2021 MGY Class B Common Stock Class A Common Stock — — 5,000,000 Disposed
March 5, 2021 MGY Class B Common Stock Class A Common Stock — — 14,165,779 Disposed
Dec. 18, 2019 MGY Class B Common Stock Class A Common Stock (6,000,000) — — 6,000,000 Disposed
March 29, 2019 MGY Class B Common Stock Class A Common Stock (1,556,991) — — 1,556,911 Disposed
Oct. 4, 2018 MGY Class B Common Stock Class A Common Stock (93,346,725) — — 2,894,551 Acquired
Sept. 4, 2018 MGY Class B Common Stock Class A Common Stock (90,452,174) — — 3,256,370 Acquired
Aug. 16, 2018 MGY Class B Common Stock Class A Common Stock (87,195,804) — — 3,256,370 Acquired

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

Initial ownership (Form 3) 2 holdings

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

Date Ticker Security Shares Ownership
Aug. 10, 2018 MGY Class A Common Stock 31,790,924 Indirect
Aug. 10, 2018 MGY Class B Common Stock→ Class A Common Stock — Indirect