John Cox
CIK 1498428 · View on SEC EDGAR ↗
Insider
First SEC filing: April 4, 2024 · Latest: April 4, 2024
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
5 sells (S)
Net:
$-336,865
+ 76 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
76 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 13, 2026 | DYN | S 10b5-1 | 4,986 | $26.28 | $131,032 | 363,165 Direct | -1.35% | Disposed | 0.5% (price as of 2026-08-19) |
| June 16, 2026 | DYN | S 10b5-1 | 2,683 | $18.33 | $49,179 | 368,151 Direct | -0.72% | Disposed | 44.1% (price as of 2026-08-19) |
| May 13, 2026 | DYN | S 10b5-1 | 3,311 | $18.36 | $60,790 | 370,834 Direct | -0.88% | Disposed | 43.8% (price as of 2026-08-19) |
| March 5, 2026 | DYN | S 10b5-1 | 2,732 | $14.90 | $40,707 | 374,145 Direct | -0.72% | Disposed | 77.2% (price as of 2026-08-19) |
| Dec. 5, 2025 | DYN | S | 2,662 | $20.72 | $55,157 | 196,877 Direct | -1.33% | Disposed | 27.5% (price as of 2026-08-19) |
| July 14, 2025 | DYN | P | 100,000 | $9.11 | $911,000 | 242,179 Direct | +70.33% | Acquired | 189.9% (price as of 2026-08-19) |
| June 5, 2025 | DYN | S 10b5-1 | 4,060 | $13.35 | $54,201 | 142,179 Direct | -2.78% | Disposed | 97.8% (price as of 2026-08-19) |
| March 5, 2025 | DYN | S 10b5-1 | 4,061 | $11.83 | $48,042 | 146,239 Direct | -2.70% | Disposed | 123.2% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 7,200 | $33.09 | $238,248 | 8,000 Indirect | +900.00% | Acquired | -20.2% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 800 | $32.57 | $26,056 | 800 Indirect | — | Acquired | -18.9% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 7,200 | $33.09 | $238,248 | 8,000 Indirect | +900.00% | Acquired | -20.2% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 800 | $32.57 | $26,056 | 800 Indirect | — | Acquired | -18.9% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 7,200 | $33.09 | $238,248 | 8,000 Indirect | +900.00% | Acquired | -20.2% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 800 | $32.57 | $26,056 | 800 Indirect | — | Acquired | -18.9% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 7,200 | $33.09 | $238,248 | 8,000 Indirect | +900.00% | Acquired | -20.2% (price as of 2026-08-19) |
| Sept. 4, 2024 | DYN | P | 800 | $32.57 | $26,056 | 800 Indirect | — | Acquired | -18.9% (price as of 2026-08-19) |
| March 24, 2020 | RGEN | S | 1,858 | $96.72 | $179,706 | 923 Direct | -66.81% | Disposed | 83.9% (price as of 2026-08-19) |
| March 18, 2020 | RGEN | S | 1,016 | $97.17 | $98,725 | 2,781 Direct | -26.76% | Disposed | 83.0% (price as of 2026-08-19) |
| March 18, 2020 | RGEN | S | 1,187 | $96.45 | $114,486 | 3,797 Direct | -23.82% | Disposed | 84.4% (price as of 2026-08-19) |
| March 18, 2020 | RGEN | S | 24,533 | $95.13 | $2,333,824 | 4,984 Direct | -83.11% | Disposed | 86.9% (price as of 2026-08-19) |
| March 4, 2020 | RGEN | S | 10,000 | $93.39 | $933,900 | 2,781 Direct | -78.24% | Disposed | 90.4% (price as of 2026-08-19) |
| Feb. 24, 2020 | RGEN | S | 4,355 | $92.76 | $403,970 | 2,781 Direct | -61.03% | Disposed | 91.7% (price as of 2026-08-19) |
| Feb. 24, 2020 | RGEN | S | 100 | $94.85 | $9,485 | 7,136 Direct | -1.38% | Disposed | 87.5% (price as of 2026-08-19) |
| March 25, 2015 | BIIB | S 10b5-1 | 12,010 | $449.06 | $5,393,211 | 25,567 Direct | -31.96% | Disposed | -51.3% (price as of 2026-08-19) |
Showing latest 100 of 170 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 |
|---|---|---|---|---|---|---|---|
| Feb. 12, 2026 | DYN | Stock option (right to buy) | Common Stock (285,000) | $16.00 | Feb. 11, 2036 | 285,000 | Acquired |
| July 16, 2025 | DYN | Stock option (right to buy) | Common Stock (197,285) | $9.33 | July 15, 2035 | 197,285 | Acquired |
| Dec. 4, 2024 | DYN | Stock option (right to buy) | Common Stock (232,100) | $29.44 | Dec. 3, 2034 | 232,100 | Acquired |
| March 25, 2024 | DYN | Stock Option (Right to Buy) | Common Stock (679,853) | $26.06 | March 24, 2034 | 679,853 | Acquired |
| March 18, 2020 | RGEN | Stock Option (Right to Buy) | Common Stock (3,304) | $42.07 | May 16, 2028 | 3,304 | Disposed |
| March 18, 2020 | RGEN | Stock Option (Right to Buy) | Common Stock (2,434) | $38.76 | May 18, 2027 | 2,434 | Disposed |
| March 18, 2020 | RGEN | Stock Option (Right to Buy) | Common Stock (3,366) | $26.12 | May 11, 2026 | 3,366 | Disposed |
| March 18, 2020 | RGEN | Stock Option (Right to Buy) | Common Stock (3,632) | $41.19 | May 21, 2025 | 3,632 | Disposed |
| March 18, 2020 | RGEN | Stock Option (Right to Buy) | Common Stock (14,000) | $12.91 | Nov. 15, 2023 | 14,000 | Disposed |
| March 4, 2020 | RGEN | Stock Option (Right to Buy) | Common Stock (10,000) | $12.91 | Nov. 15, 2023 | 10,000 | Disposed |
| May 15, 2019 | RGEN | Stock Option (Right to Buy) | Common Stock (2,109) | $67.71 | May 15, 2029 | 2,109 | Acquired |
| May 16, 2018 | RGEN | Stock Option (Right to Buy) | Common Stock (3,304) | $42.07 | May 16, 2028 | 3,304 | Acquired |
| May 18, 2017 | RGEN | Stock Option (Right to Buy) | Common Stock (2,434) | $38.76 | May 18, 2027 | 2,434 | Acquired |
| May 11, 2016 | RGEN | Stock Option (Right to Buy) | Common Stock (3,366) | $26.12 | May 11, 2026 | 3,366 | Acquired |
| Feb. 23, 2016 | BIIB | Restricted Stock Unit | Common Stock (1,608) | $0.00 | Feb. 23, 2018 | 1,608 | Disposed |
| Feb. 23, 2016 | BIIB | Restricted Stock Unit | Common Stock (810) | $0.00 | Feb. 23, 2018 | 810 | Disposed |
| Feb. 22, 2016 | BIIB | Restricted Stock Unit | Common Stock (11,850) | $0.00 | Feb. 22, 2019 | 11,850 | Acquired |
| Feb. 12, 2016 | BIIB | Restricted Stock Unit | Common Stock (1,394) | $0.00 | Feb. 12, 2017 | 1,394 | Disposed |
| Feb. 12, 2016 | BIIB | Restricted Stock Unit | Common Stock (2,246) | $0.00 | Feb. 12, 2017 | 2,246 | Disposed |
| Feb. 12, 2016 | BIIB | Restricted Stock Unit | Common Stock (1,052) | $0.00 | Feb. 12, 2017 | 1,052 | Disposed |
| Feb. 8, 2016 | BIIB | Restricted Stock Unit | Common Stock (4,026) | $0.00 | Feb. 8, 2016 | 4,026 | Disposed |
| May 21, 2015 | RGEN | Stock Option (Right to Buy) | Common Stock (3,632) | $41.19 | May 21, 2025 | 3,632 | Acquired |
| March 25, 2015 | BIIB | Stock Option (Right to Buy) | Common Stock (2,891) | $60.56 | Feb. 12, 2018 | 2,891 | Disposed |
| March 25, 2015 | BIIB | Stock Option (Right to Buy) | Common Stock (2,175) | $72.87 | Nov. 1, 2017 | 2,175 | Disposed |
| Feb. 23, 2015 | BIIB | Restricted Stock Unit | Common Stock (7,260) | $0.00 | Feb. 23, 2018 | 7,260 | Acquired |
| Feb. 12, 2015 | BIIB | Restricted Stock Unit | Common Stock (954) | $0.00 | Feb. 12, 2017 | 954 | Disposed |
| Feb. 12, 2015 | BIIB | Restricted Stock Unit | Common Stock (1,492) | $0.00 | Feb. 12, 2017 | 1,492 | Disposed |
| Feb. 12, 2015 | BIIB | Restricted Stock Unit | Common Stock (2,246) | $0.00 | Feb. 12, 2017 | 2,246 | Disposed |
| Feb. 9, 2015 | BIIB | Restricted Stock Unit | Common Stock (4,691) | — | Feb. 9, 2015 | 4,691 | Disposed |
| Feb. 8, 2015 | BIIB | Restricted Stock Unit | Common Stock (4,023) | $0.00 | Feb. 8, 2016 | 4,023 | Disposed |
| Feb. 23, 2014 | BIIB | Restricted Stock Unit | Common Stock (2,598) | — | Feb. 23, 2014 | 2,598 | Disposed |
| Feb. 12, 2014 | BIIB | Restricted Stock Unit | Common Stock (7,340) | $0.00 | Feb. 12, 2017 | 7,340 | Acquired |
| Feb. 12, 2014 | BIIB | Restricted Stock Unit | Common Stock (2,246) | $0.00 | Feb. 12, 2017 | 2,246 | Disposed |
| Feb. 9, 2014 | BIIB | Restricted Stock Unit | Common Stock (4,691) | $0.00 | Feb. 9, 2015 | 4,691 | Disposed |
| Feb. 8, 2014 | BIIB | Restricted Stock Unit | Common Stock (4,023) | $0.00 | Feb. 8, 2016 | 4,023 | Disposed |
| Nov. 15, 2013 | RGEN | Stock Option (Right to Buy) | Common Stock (24,000) | $12.91 | Nov. 15, 2023 | 24,000 | Acquired |
| Feb. 23, 2013 | BIIB | Restricted Stock Unit | Common Stock (2,598) | $0.00 | Feb. 23, 2014 | 2,598 | Disposed |
| Feb. 12, 2013 | BIIB | Restricted Stock Unit | Common Stock (8,987) | $0.00 | Feb. 12, 2017 | 8,987 | Acquired |
| Feb. 9, 2013 | BIIB | Restricted Stock Unit | Common Stock (4,692) | $0.00 | Feb. 9, 2015 | 4,692 | Disposed |
| Feb. 8, 2013 | BIIB | Restricted Stock Unit | Common Stock (536) | $0.00 | Feb. 8, 2016 | 536 | Disposed |
| Feb. 8, 2013 | BIIB | Restricted Stock Unit | Common Stock (3,487) | $0.00 | Feb. 8, 2016 | 3,487 | Disposed |
| Feb. 23, 2012 | BIIB | Restricted Stock Unit | Common Stock (2,600) | — | Feb. 23, 2014 | 2,600 | Disposed |
| Feb. 9, 2012 | BIIB | Restricted Stock Unit | Common Stock (4,692) | — | Feb. 9, 2015 | 4,692 | Disposed |
| Feb. 8, 2012 | BIIB | Restricted Stock Unit | Common Stock (16,095) | $0.00 | Feb. 8, 2016 | 16,095 | Acquired |
| Nov. 1, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (2,175) | $72.87 | Nov. 1, 2017 | 2,175 | Disposed |
| April 21, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (4,350) | $72.87 | Nov. 1, 2017 | 4,350 | Disposed |
| April 13, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (7,587) | $49.65 | Feb. 24, 2019 | 7,587 | Disposed |
| April 13, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (17,347) | $60.56 | Feb. 12, 2018 | 17,347 | Disposed |
| April 13, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (7,400) | $49.31 | Feb. 12, 2017 | 7,400 | Disposed |
| April 13, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (3,900) | $67.57 | Feb. 17, 2015 | 3,900 | Disposed |
| April 11, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (6,900) | $47.92 | March 13, 2016 | 6,900 | Disposed |
| March 31, 2011 | BIIB | Stock Option (Right to Buy) | Common Stock (2,840) | $43.50 | Feb. 6, 2014 | 2,840 | Disposed |
| Feb. 23, 2011 | BIIB | Restricted Stock Unit | Common Stock (0) | — | Feb. 23, 2014 | 462 | Disposed |
| Feb. 23, 2011 | BIIB | Restricted Stock Unit | Common Stock (405) | — | Feb. 23, 2014 | 405 | Disposed |
| Feb. 23, 2011 | BIIB | Restricted Stock Unit | Common Stock (1,733) | — | Feb. 23, 2014 | 1,733 | Disposed |
| Feb. 9, 2011 | BIIB | Restricted Stock Unit | Common Stock (18,766) | — | Feb. 9, 2015 | 18,766 | Acquired |
| Oct. 28, 2010 | BIIB | Stock Option (Right to Buy) | Common Stock (6,900) | $33.97 | July 28, 2013 | 6,900 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 12 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| April 4, 2024 | DYN | Common Stock | 5,000 | Direct |
| March 27, 2024 | DYN | Common Stock | 10,000 | Direct |
| Aug. 10, 2010 | BIIB | Common Stock | 18,254 | Direct |
| Aug. 10, 2010 | BIIB | Restricted Stock Unit→ Common Stock (10,396) | 10,396 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (6,900) | 6,900 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (2,840) | 2,840 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (3,900) | 3,900 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (6,900) | 6,900 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (7,400) | 7,400 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (8,700) | 8,700 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (23,130) | 23,130 | Direct |
| Aug. 10, 2010 | BIIB | Stock Option (Right to Buy)→ Common Stock (15,175) | 15,175 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2016 | $696,750 | — | — | — | $594,636 | $247,644 | $181,167 | $7,730,964 |
| 2012 | $552,023 | — | — | — | $489,456 | $4,781 | $131,814 | $4,062,454 |
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $721,000 | — | — | $937,893 | $410,970 | — | $7,005 | $2,076,868 |
| 2024 | $536,986 | — | $4,277,632 | $15,533,800 | $339,510 | — | $796 | $20,688,724 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.