John Markels
CIK 1803424 · View on SEC EDGAR ↗
Insider
First SEC filing: June 15, 2026 · Latest: June 15, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 10 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
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 16, 2026 | PCVX | A | 23,029 | — | — | 23,029 Direct | — | Acquired | (price as of 2026-08-19) |
| June 5, 2026 | ARCT | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 9, 2025 | ARCT | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 14, 2024 | ARCT | A | 15,000 | — | — | 15,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 14, 2024 | ARCT | M | 3,131 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| June 14, 2024 | ARCT | M | 3,131 | — | — | 3,131 Direct | — | Acquired | (price as of 2026-08-19) |
| Aug. 1, 2023 | ARCT | A | 3,131 | — | — | 3,131 Direct | — | Acquired | (price as of 2026-08-19) |
| Aug. 1, 2023 | ARCT | A | 11,869 | — | — | 11,869 Direct | — | Acquired | (price as of 2026-08-19) |
| Dec. 8, 2022 | ARCT | A | 6,986 | — | — | 6,986 Direct | — | Acquired | (price as of 2026-08-19) |
| Dec. 8, 2022 | ARCT | A | 20,000 | — | — | 20,000 Direct | — | Acquired | (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 |
|---|---|---|---|---|---|---|---|
| July 16, 2026 | PCVX | Stock Option (right to buy) | Common Stock (23,029) | $56.04 | July 16, 2036 | 23,029 | Acquired |
| June 5, 2026 | ARCT | Stock option (right to buy) [F1] | Common Stock (15,000) | $7.30 | June 5, 2036 | 15,000 | Acquired |
| June 9, 2025 | ARCT | Stock option (right to buy) [F1] | Common Stock (15,000) | $12.54 | June 9, 2035 | 15,000 | Acquired |
| June 14, 2024 | ARCT | Stock option (right to buy) [F3] | Common Stock (15,000) | $31.00 | June 14, 2034 | 15,000 | Acquired |
| June 14, 2024 | ARCT | Deferred Stock Units [F2] | Common Stock (3,131) | $0.00 | — | 3,131 | Disposed |
| Aug. 1, 2023 | ARCT | Deferred Stock Units | Common Stock (3,131) | — | — | 3,131 | Acquired |
| Aug. 1, 2023 | ARCT | Stock option (right to buy) | Common Stock (11,869) | $34.92 | Aug. 1, 2033 | 11,869 | Acquired |
| Dec. 8, 2022 | ARCT | Stock option (right to buy) | Common Stock (6,986) | $18.04 | Dec. 8, 2032 | 6,986 | Acquired |
| Dec. 8, 2022 | ARCT | Stock option (right to buy) | Common Stock (20,000) | $18.04 | Dec. 8, 2032 | 20,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| July 16, 2026 | PCVX | No securities owned. | 0 | Direct |