Kastelein Johannes Jacob Pieter

Director · Officer · NAMS

As of 2026-09-16, Kastelein Johannes Jacob Pieter has 37 Form 4 transactions on record across 1 company — 22 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market sales filed in August in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $1.1MIndirect: $4.1M$5.2Mas of 2026-09-16
  • Direct $1.1M
  • Indirect $4.1M
NAMSindirect194,302 sh$4.1M
NAMSdirect53,500 sh$1.1M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

NAMS · 37 trades
2026-08-24: Sale, 125,000 sh ($3.4M)2026-08-24: Option exercise, 125,000 sh ($0)2026-08-24: Option exercise, 125,000 sh2026-08-24: Option exercise, 125,000 sh2026-03-09: Sale, 101,409 sh ($3.1M)2026-03-09: Option exercise, 101,409 sh ($0)2026-03-09: Option exercise, 101,409 sh2026-03-09: Option exercise, 101,409 sh2026-03-06: Sale, 94,124 sh ($2.9M)2026-03-06: Option exercise, 94,124 sh ($0)2026-03-06: Option exercise, 94,124 sh2026-03-06: Option exercise, 94,124 sh2026-03-05: Sale, 104,467 sh ($3.2M)2026-03-05: Option exercise, 104,467 sh ($0)2026-03-05: Option exercise, 104,467 sh2026-03-05: Option exercise, 104,467 sh2026-02-20: Sale, 30,789 sh ($1.1M)2026-02-20: Sale, 14,692 sh ($514K)2026-01-07: Award / grant, 115,000 sh ($0)2026-01-07: Award / grant, 25,500 sh2026-01-07: Award / grant, 25,500 sh2026-01-05: Sale, 6,000 sh ($200K)2025-08-22: Sale, 42,342 sh ($1.1M)2025-08-22: Sale, 7,658 sh ($195K)2025-08-21: Sale, 50,000 sh ($1.2M)2025-03-26: Award / grant, 19,302 sh ($0)2025-03-26: Option exercise, 45,481 sh ($0)2025-03-26: Award / grant, 45,481 sh2025-03-26: Option exercise, 45,481 sh2025-03-26: Award / grant, 45,481 sh2025-03-26: Option exercise, 45,481 sh2025-03-24: Option exercise, 150,000 sh ($0)2025-03-24: Option exercise, 150,000 sh2025-03-24: Option exercise, 150,000 sh2025-01-07: Award / grant, 34,000 sh2025-01-07: Award / grant, 34,000 sh2025-01-02: Award / grant, 200,000 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-08-24NAMSSale125,000 @ $26.91$3.4M−64.3% of holding69,302Form 4
2026-03-09NAMSSale101,409 @ $30.29$3.1M−59.4% of holding69,302Form 4
2026-03-06NAMSSale94,124 @ $30.32$2.9M−57.6% of holding69,302Form 4
2026-03-05NAMSSale104,467 @ $30.30$3.2M−60.1% of holding69,302Form 4
2026-02-20NAMSSale30,789 @ $35.46$1.1M−36.5% of holding53,500Form 4
2026-02-20NAMSSale14,692 @ $35.00$514K−14.8% of holding84,289Form 4
2026-01-05NAMSSale6,000 @ $33.25$200K−7.5% of holding73,481Form 4
2025-08-22NAMSSale42,342 @ $25.08$1.1M−35.5% of holding76,960Form 4
2025-08-22NAMSSale7,658 @ $25.49$195K−10.0% of holding69,302Form 4
2025-08-21NAMSSale50,000 @ $24.29$1.2M−29.5% of holding119,302Form 4
27 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-08-24NAMSOption exercise125,000395,229Form 4
2026-08-24NAMSOption exercise125,000194,302Form 4
2026-08-24NAMSOption exercise125,000194,302Form 4
2026-03-09NAMSOption exercise101,409520,229Form 4
2026-03-09NAMSOption exercise101,409170,711Form 4
2026-03-09NAMSOption exercise101,409170,711Form 4
2026-03-06NAMSOption exercise94,124621,638Form 4
2026-03-06NAMSOption exercise94,124163,426Form 4
2026-03-06NAMSOption exercise94,124163,426Form 4
2026-03-05NAMSOption exercise104,467715,762Form 4
2026-03-05NAMSOption exercise104,467173,769Form 4
2026-03-05NAMSOption exercise104,467173,769Form 4
2026-01-07NAMSAward / grant115,000115,000Form 4
2026-01-07NAMSAward / grant25,50098,981Form 4
2026-01-07NAMSAward / grant25,50098,981Form 4
2025-03-26NAMSAward / grant19,302169,302Form 4
2025-03-26NAMSOption exercise45,48179,481Form 4
2025-03-26NAMSAward / grant45,48145,481Form 4
2025-03-26NAMSOption exercise45,4810Form 4
2025-03-26NAMSAward / grant45,48145,481Form 4
2025-03-26NAMSOption exercise45,4810Form 4
2025-03-24NAMSOption exercise150,000820,229Form 4
2025-03-24NAMSOption exercise150,000150,000Form 4
2025-03-24NAMSOption exercise150,000150,000Form 4
2025-01-07NAMSAward / grant34,00034,000Form 4
2025-01-07NAMSAward / grant34,00034,000Form 4
2025-01-02NAMSAward / grant200,000200,000Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.