Johannes Jacob Pieter Kastelein

CIK 2000389 · View on SEC EDGAR ↗

Insider

First SEC filing: Dec. 29, 2023 · Latest: Dec. 29, 2023

On this page

Insider at

Insider transactions

0 buys (P) 8 sells (S) Net: $-12,153,506 + 20 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

20 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
March 9, 2026 NAMSW S 101,409 $30.29 $3,071,679 69,302 Indirect -59.40% Disposed -45.5% (price as of 2026-08-21)
March 6, 2026 NAMSW S 94,124 $30.32 $2,853,840 69,302 Indirect -57.59% Disposed -45.5% (price as of 2026-08-21)
March 5, 2026 NAMSW S 104,467 $30.30 $3,165,350 69,302 Indirect -60.12% Disposed -45.5% (price as of 2026-08-21)
Feb. 20, 2026 NAMSW S 30,789 $35.46 $1,091,778 53,500 Direct -36.53% Disposed -53.4% (price as of 2026-08-21)
Feb. 20, 2026 NAMSW S 14,692 $35.00 $514,220 84,289 Direct -14.84% Disposed -52.8% (price as of 2026-08-21)
Jan. 5, 2026 NAMSW S 6,000 $33.25 $199,500 73,481 Direct -7.55% Disposed -50.3% (price as of 2026-08-21)
Aug. 22, 2025 NAMSW S 7,658 $25.49 $195,202 69,302 Indirect -9.95% Disposed -35.2% (price as of 2026-08-21)
Aug. 22, 2025 NAMSW S 42,342 $25.08 $1,061,937 76,960 Indirect -35.49% Disposed -34.2% (price as of 2026-08-21)
Aug. 21, 2025 NAMSW S 50,000 $24.29 $1,214,500 119,302 Indirect -29.53% Disposed -32.0% (price as of 2026-08-21)
March 26, 2024 NAMSW S 190,476 $21.50 $4,095,234 0 Indirect -100.00% Disposed -23.2% (price as of 2026-08-21)

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
March 9, 2026 NAMSW Option (right to buy) Ordinary Shares (101,409) — July 6, 2031 101,409 Disposed
March 6, 2026 NAMSW Option (right to buy) Ordinary Shares (94,124) — July 6, 2031 94,124 Disposed
March 5, 2026 NAMSW Option (right to buy) Ordinary Shares (104,467) — July 6, 2031 104,467 Disposed
Jan. 7, 2026 NAMSW Option (right to buy) Ordinary Shares (115,000) $35.45 Jan. 7, 2036 115,000 Acquired
March 26, 2025 NAMSW Restricted Stock Unit Ordinary Shares (45,481) — — 45,481 Disposed
March 26, 2025 NAMSW Restricted Stock Unit Ordinary Shares (45,481) — — 45,481 Acquired
March 24, 2025 NAMSW Option (right to buy) Ordinary Shares (150,000) — July 6, 2031 150,000 Disposed
Jan. 2, 2025 NAMSW Option (right to buy) Ordinary Shares (200,000) $25.96 Jan. 2, 2035 200,000 Acquired
March 26, 2024 NAMSW Option (right to buy) Ordinary Shares (201,673) — July 6, 2031 201,673 Disposed
Jan. 1, 2024 NAMSW Option (right to buy) Ordinary Shares (500,000) $11.17 Jan. 1, 2034 500,000 Acquired

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

Initial ownership (Form 3) 3 holdings

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

Date Ticker Security Shares Ownership
Dec. 29, 2023 NAMSW Employee Option (right to buy)→ Ordinary Shares (477,347) 477,347 Direct
Dec. 29, 2023 NAMSW Employee Option (right to buy)→ Ordinary Shares (971,726) 971,726 Direct
Dec. 29, 2023 NAMSW Employee Option (right to buy)→ Ordinary Shares (1,171,902) 1,171,902 Indirect