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Karen M. Anderson

CIK 1762176 · Chief People Officer · last filed 2026-06-24

Karen M. Anderson is a Chief People Officer who has filed 38 SEC Form 4 insider transactions across 2 companies since 2019. The most recent filing, for CNTA, was dated Jun 24, 2026. Across all open-market trades the lifetime net is −$17.1M, making them a net seller over the disclosed history.

"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

$0

Companies

2

Total Filings

38

Lifetime Open-Market Net

-$17.13M

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
Centessa Pharmaceuticals plc (CNTA) Delisted Chief People Officer 0 $40.50 $0 -$11.24M 13 2026-06-24
Mimecast Ltd (MIME) Delisted Chief Human Resources Officer 8,649 $79.92 $691.2K -$5.89M 15 2022-04-04

Recent Filings

38 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
2026-06-24 Centessa Pharmaceuticals plc (CNTA) Delisted Disp (D) −62,085 $0 EDGAR
2026-03-27 Centessa Pharmaceuticals plc (CNTA) Delisted Mixed — -$908.4K EDGAR
2026-03-26 — Notice (144) −41,076 -$1.16M EDGAR
2026-03-18 Centessa Pharmaceuticals plc (CNTA) Delisted Mixed — -$1.81M EDGAR
2026-03-17 — Notice (144) −10,043 -$281.0K EDGAR
2026-03-16 — Notice (144) −64,768 -$1.83M EDGAR
2026-03-16 Centessa Pharmaceuticals plc (CNTA) Delisted Mixed −10,631 -$2.71M EDGAR
2026-03-13 — Notice (144) −120,029 -$3.10M EDGAR
2026-03-13 Centessa Pharmaceuticals plc (CNTA) Delisted Mixed −10,631 -$2.71M EDGAR
2026-02-03 Centessa Pharmaceuticals plc (CNTA) Delisted Mixed +18,394 -$260.6K EDGAR
Showing 1–10 of 38
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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.