Davidson Michael H.

Director · Officer · NAMS, BIOA, TENX, SLN

As of 2026-09-16, Davidson Michael H. has 43 Form 4 transactions on record across 4 companies — 28 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 March in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $17.6MIndirect: $0$17.6Mas of 2026-09-16
  • Direct $17.6M
  • Indirect $0
NAMSdirect792,923 sh$16.8M
SLNdirect48,000 sh$600K
BIOAdirect22,000 sh$171K
TENXdirect30,000 sh$55K

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
2026-09-14: Purchase, 10,000 sh ($227K)2026-03-02: Sale, 443,707 sh ($14.8M)2026-03-02: Option exercise, 443,707 sh ($0)2026-03-02: Option exercise, 443,707 sh2026-03-02: Option exercise, 443,707 sh2026-02-26: Sale, 165,408 sh ($5.6M)2026-02-26: Sale, 17,924 sh ($617K)2026-02-26: Option exercise, 183,332 sh ($0)2026-02-26: Option exercise, 183,332 sh2026-02-26: Option exercise, 183,332 sh2026-02-25: Sale, 46,517 sh ($1.6M)2026-02-25: Sale, 10,436 sh ($375K)2026-02-25: Sale, 1,300 sh ($48K)2026-02-25: Option exercise, 58,253 sh ($0)2026-02-25: Option exercise, 58,253 sh2026-02-25: Option exercise, 58,253 sh2026-02-24: Sale, 61,547 sh ($2.2M)2026-02-24: Sale, 3,161 sh ($115K)2026-02-24: Option exercise, 64,708 sh ($0)2026-02-24: Option exercise, 64,708 sh2026-02-24: Option exercise, 64,708 sh2026-01-07: Award / grant, 364,000 sh ($0)2026-01-07: Sale, 11,582 sh2026-01-07: Award / grant, 81,000 sh2026-01-07: Award / grant, 81,000 sh2026-01-07: Sale, 11,582 sh2025-03-26: Option exercise, 38,394 sh ($0)2025-03-26: Award / grant, 30,992 sh ($0)2025-03-26: Option exercise, 38,394 sh2025-03-26: Award / grant, 38,394 sh2025-03-26: Sale, 12,258 sh2025-03-26: Option exercise, 38,394 sh2025-03-26: Award / grant, 38,394 sh2025-03-26: Sale, 12,258 sh2025-01-07: Award / grant, 123,529 sh2025-01-07: Award / grant, 123,529 sh2025-01-06: Award / grant, 670,467 sh ($0)
TENX · 3 trades
2026-01-09: Award / grant, 30,000 sh ($0)2025-07-01: Award / grant, 80,000 sh ($0)2024-12-10: Award / grant, 100,000 sh ($0)
BIOA · 2 trades
2026-06-10: Award / grant, 22,000 sh ($0)2025-06-05: Award / grant, 22,000 sh ($0)
SLN · 1 trade
2025-01-02: Award / grant, 48,000 sh ($0)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-09-14NAMSPurchase10,000 @ $22.65$227K+1.3% of holding792,923Form 4
2026-03-02NAMSSale443,707 @ $33.25$14.8M−71.8% of holding174,144Form 4
2026-02-26NAMSSale165,408 @ $33.63$5.6M−25.7% of holding477,783Form 4
2026-02-26NAMSSale17,924 @ $34.44$617K−9.3% of holding174,144Form 4
2026-02-25NAMSSale46,517 @ $35.11$1.6M−9.0% of holding471,595Form 4
2026-02-25NAMSSale10,436 @ $35.96$375K−2.2% of holding461,159Form 4
2026-02-25NAMSSale1,300 @ $36.68$48K−0.3% of holding459,859Form 4
2026-02-24NAMSSale61,547 @ $36.13$2.2M−11.7% of holding463,020Form 4
2026-02-24NAMSSale3,161 @ $36.46$115K−0.7% of holding459,859Form 4
2026-01-07NAMSSale11,582—−3.0% of holding378,859Form 4
2026-01-07NAMSSale11,582—−3.0% of holding378,859Form 4
2025-03-26NAMSSale12,258—−3.0% of holding390,441Form 4
2025-03-26NAMSSale12,258—−3.0% of holding390,441Form 4
30 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-06-10BIOAAward / grant22,00022,000Form 4
2026-03-02NAMSOption exercise443,707239,267Form 4
2026-03-02NAMSOption exercise443,707617,851Form 4
2026-03-02NAMSOption exercise443,707617,851Form 4
2026-02-26NAMSOption exercise183,332682,974Form 4
2026-02-26NAMSOption exercise183,332643,191Form 4
2026-02-26NAMSOption exercise183,332643,191Form 4
2026-02-25NAMSOption exercise58,253866,306Form 4
2026-02-25NAMSOption exercise58,253518,112Form 4
2026-02-25NAMSOption exercise58,253518,112Form 4
2026-02-24NAMSOption exercise64,708924,559Form 4
2026-02-24NAMSOption exercise64,708524,567Form 4
2026-02-24NAMSOption exercise64,708524,567Form 4
2026-01-09TENXAward / grant30,00030,000Form 4
2026-01-07NAMSAward / grant364,000364,000Form 4
2026-01-07NAMSAward / grant81,000459,859Form 4
2026-01-07NAMSAward / grant81,000459,859Form 4
2025-07-01TENXAward / grant80,00080,000Form 4
2025-06-05BIOAAward / grant22,00022,000Form 4
2025-03-26NAMSOption exercise38,394402,699Form 4
2025-03-26NAMSAward / grant30,992364,305Form 4
2025-03-26NAMSOption exercise38,3940Form 4
2025-03-26NAMSAward / grant38,39438,394Form 4
2025-03-26NAMSOption exercise38,3940Form 4
2025-03-26NAMSAward / grant38,39438,394Form 4
2025-01-07NAMSAward / grant123,529123,529Form 4
2025-01-07NAMSAward / grant123,529123,529Form 4
2025-01-06NAMSAward / grant670,467670,467Form 4
2025-01-02SLNAward / grant48,00048,000Form 4
2024-12-10TENXAward / grant100,000100,000Form 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.