Question 1

Who are the insiders buying QUEST DIAGNOSTICS INC stock?

Accepted Answer

InsiderAct tracks all open-market purchases of QUEST DIAGNOSTICS INC stock by corporate insiders — including officers, directors, and shareholders owning more than 10% — sourced from public SEC Form 4 filings.

Question 2

What does insider buying at a company mean?

Accepted Answer

When a corporate officer, director, or major shareholder purchases their own company's stock on the open market using personal funds, it signals confidence in the company's outlook. This is especially meaningful when multiple insiders buy within the same 7–14 day window (cluster buying) or when the purchase size exceeds $100,000.

Question 3

How do I find cluster buying signals for a company?

Accepted Answer

InsiderAct automatically detects cluster buying — two or more insiders independently purchasing shares within a 14-day window. When a cluster buy signal is active for a company, it appears prominently on the company's InsiderAct page and on the Signals tab.

Question 4

Has QUEST DIAGNOSTICS INC had any recent large insider purchases?

Accepted Answer

InsiderAct tracks all open-market purchases of $100,000 or more at QUEST DIAGNOSTICS INC. Large insider purchases are flagged as high-conviction signals because they represent meaningful personal capital commitments by executives or directors who have direct visibility into the company's operations and prospects.

Question 5

Where do the insider transactions on this page come from?

Accepted Answer

All transactions shown on InsiderAct company pages are sourced directly from SEC EDGAR Form 4 filings — the mandatory public disclosures that corporate insiders must submit within 2 business days of any stock transaction. InsiderAct ingests these filings in near real time and filters for open-market purchases and sales.


2026-03-11	2026-03-09	Wentworth Timothy C	Director	Award	215	$0.00	$0
2026-03-06	2026-03-04	Doherty Catherine T.	EVP	Award	11,364	$204.86	$2,328,029
2026-03-06	2026-03-05	Doherty Catherine T.	EVP	Sale	5,558	$206.21	$1,146,115
2026-03-06	2026-03-04	Doherty Catherine T.	EVP	Tax Payment	5,806	$204.86	$1,189,417
2026-03-06	2026-03-04	Prevoznik Michael E	SVP	Tax Payment	3,354	$204.86	$687,100
2026-03-06	2026-03-04	Prevoznik Michael E	SVP	Award	7,232	$204.86	$1,481,548
2026-03-06	2026-03-05	Prevoznik Michael E	SVP	Sale	3,878	$206.21	$799,682
2026-03-06	2026-03-04	Plewman Patrick	SVP	Tax Payment	2,827	$204.86	$579,139
2026-03-06	2026-03-04	Plewman Patrick	SVP	Award	5,682	$204.86	$1,164,015
2026-03-06	2026-03-05	Plewman Patrick	SVP	Sale	2,855	$206.21	$588,730

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