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Robert Gardner Harrison

CIK 1421563 · Chief Information Officer · last filed 2026-03-12

Robert Gardner Harrison is a Chief Information Officer who has filed 84 SEC Form 4 insider transactions across 2 companies since 2008. The most recent filing, for SERA, was dated Apr 21, 2026. Across all open-market trades the lifetime net is −$6.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $293.2K 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

$293.2K

Companies

2

Total Filings

84

Lifetime Open-Market Net

-$6.39M

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
SERA Chief Information Officer 76,712 $2.03 $155.7K -$515.9K 31 2026-03-12
MYGN Chief Information Officer 25,844 $5.32 $137.5K -$5.88M 23 2014-09-18

Recent Filings

84 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
2026-04-21 SERA Notice (144) −2,000 -$4.6K EDGAR
2026-03-24 SERA Notice (144) −2,000 -$3.6K EDGAR
2026-03-12 SERA Sell (S) −716 -$1.5K EDGAR
2026-03-12 SERA Notice (144) −716 -$1.5K EDGAR
2026-03-10 SERA Sell (S) −3,360 -$6.6K EDGAR
2026-03-10 SERA Notice (144) −3,360 -$6.6K EDGAR
2026-02-24 SERA Notice (144) −2,000 -$4.9K EDGAR
2026-02-24 SERA Sell (S) −2,000 -$4.7K EDGAR
2026-01-27 SERA Notice (144) −2,000 -$6.2K EDGAR
2026-01-27 SERA Sell (S) −2,000 -$5.9K EDGAR
Showing 1–10 of 84
Page 1 of 9
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.