Nelson Chai

CIK: 0001299914

Transaction Breakdown

Open Market Buys (P)2 (22.2%)

High conviction signal

Open Market Sales (S)1 (11.1%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)4 (44.4%)

Compensation grants

Other (G, F, J, C, D, …)2 (22.2%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (2)

Chubb Ltd

Director

TMO

THERMO FISHER SCIENTIFIC INC.

Director

Discretionary Trading P&L

Holdings

Transaction History (9 total)

CB
Chubb Ltd
May 21, 2026
Tax Payment(F)
Direct
193 shares at avg. $330.26$64K
CB
Chubb Ltd
May 21, 2026
Award(A)
Direct
681 shares-
TMO
THERMO FISHER SCIENTIFIC INC.
May 20, 2026
Award(A)
Direct
499 shares-
TMO
THERMO FISHER SCIENTIFIC INC.
May 21, 2025
Award(A)
Direct
565 shares-
CB
Chubb Ltd
May 15, 2025
Award(A)
Direct
771 shares-
CB
Chubb Ltd
May 15, 2025
Tax Payment(F)
Direct
180 shares at avg. $292.05$53K
TMO
THERMO FISHER SCIENTIFIC INC.
Feb 19, 2025
Sale(S)
Direct
16 shares at avg. $528.09$8K
TMO
THERMO FISHER SCIENTIFIC INC.
Dec 9, 2024
Purchase(P)
Direct
4 shares at avg. $535.93$2K
TMO
THERMO FISHER SCIENTIFIC INC.
Nov 7, 2024
Purchase(P)
Direct
16 shares at avg. $555.89$9K

		Type	Shares	Price		Ownership
May 21, 2026	CB Chubb Ltd	Tax Payment(F)	193	$330.26	$63,740	Direct
May 21, 2026	CB Chubb Ltd	Award(A)	681	-	$0	Direct
May 20, 2026	TMO THERMO FISHER SCIENTIFIC INC.	Award(A)	499	-	$0	Direct
May 21, 2025	TMO THERMO FISHER SCIENTIFIC INC.	Award(A)	565	-	-	Direct
May 15, 2025	CB Chubb Ltd	Award(A)	771	-	-	Direct
May 15, 2025	CB Chubb Ltd	Tax Payment(F)	180	$292.05	$52,569	Direct
Feb 19, 2025	TMO THERMO FISHER SCIENTIFIC INC.	Sale(S)	16	$528.09	$8,449	Direct
Dec 9, 2024	TMO THERMO FISHER SCIENTIFIC INC.	Purchase(P)	4	$535.93	$2,144	Direct
Nov 7, 2024	TMO THERMO FISHER SCIENTIFIC INC.	Purchase(P)	16	$555.89	$8,894	Direct

1-9 of 9 transactions

About Chai Nelson

Chai Nelson (SEC CIK 0001299914) files insider reports with the SEC as Director of Chubb Ltd (CB) and Director of THERMO FISHER SCIENTIFIC INC. (TMO).

Signal8 holds 5 ownership filings by Chai Nelson, all Form 4s, filed between Feb 21, 2025 and May 26, 2026. Those filings report 9 transactions, from Nov 7, 2024 to May 21, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Chai Nelson's filings is in WALTHAM, MA.

Recent filings by Chai Nelson

May 21, 2026: Tax withholding of CB shares (Form 4, code F).
May 21, 2026: Grant or award of CB shares (Form 4, code A).
May 20, 2026: Grant or award of TMO shares (Form 4, code A).
May 21, 2025: Grant or award of TMO shares (Form 4, code A).
May 15, 2025: Grant or award of CB shares (Form 4, code A).

Other insiders filing for Chubb Ltd (CB)

GREENBERG EVAN G, Chairman & CEO
BOROUGHS TIMOTHY ALAN, Executive Vice President*
Wayland Joseph F, Executive Vice President and*
CONNORS MICHAEL P, Director
Ortega Juan Luis, Executive Vice President*
Keogh John W, President &COO

How to read Form 4 transaction codes