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Bonnie L Bassler

CIK 1683607 · last filed 2026-06-08

Bonnie L Bassler is a corporate insider who has filed 85 SEC Form 4 insider transactions across 4 companies since 2016. The most recent filing, for RPRX, was dated Jun 8, 2026. Across all open-market trades the lifetime net is −$22.3M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $5.9M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$5.86M

Companies

4

Total Filings

85

Lifetime Open-Market Net

-$22.33M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
RPRX Director 78,492 $59.59 $4.68M $0 30 2026-06-08
REGN Director 1,703 $695.63 $1.18M -$22.33M 33 2026-01-08
Cidara Therapeutics, Inc. (CDTX) Delisted Director 0 $221.38 $0 $0 8 2026-01-07
Kaleido Biosciences, Inc. (KLDO) Delisted Director — $0.29 — $0 2 2021-07-01

Recent Filings

85 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-06-08 RPRX Grant (A) +4,545 $0 EDGAR
2026-03-31 RPRX Grant (A) +815 $37.5K EDGAR
2026-01-08 REGN Mixed — -$638.8K EDGAR
2026-01-07 Cidara Therapeutics, Inc. (CDTX) Delisted Disp (D) −15 -$3.3K EDGAR
2026-01-07 REGN Notice (144) −1,500 -$1.20M EDGAR
2026-01-06 REGN Grant (A) +155 $0 EDGAR
2026-01-02 RPRX Grant (A) +967 $37.5K EDGAR
2025-11-24 REGN Mixed — -$287.7K EDGAR
2025-11-20 REGN Notice (144) −760 -$570.0K EDGAR
2025-09-30 RPRX Grant (A) +1,047 $37.5K EDGAR
Showing 1–10 of 85
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.