Arcellx, Inc.

ACLXNASDAQHealthcare

$115.07

+$0.02(+0.02%)

Market Cap$6.7B

P/E Ratio—

52W High$115.13

52W Low$50.85

Avg Volume1.4M

Open$115.03

Beta0.25

Overview

Arcellx, Inc. (ACLX) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · ACLX · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

0.00

Buy/Sell (by trades)

Overall sentiment

BEARISH

↑ Buy 0%Active transactions only · RSU vesting excluded100% Sell ↓

Arcellx, Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

ACLX insider buying and selling by quarter

ACLX insider selling · ACLX insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

5.6M2.8M0

2024 Q3

2024 Q4

2025 Q1

2025 Q2

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · ACLX ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

ACLX executive sell shares · ACLX board member insider trading · ACLX insider trading SEC filing

Showing 34 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Apr 28, 2026	Carroll Jill Director	Other	1,479,148	$115.00	$170.10M⚡	0	Form 4
Apr 28, 2026	Behbahani Ali Director	Other	2,706	$115.00	$311K	0	Form 4
Apr 28, 2026	Lubner David Charles Director	Other	21,659	$115.00	$2.49M⚡	0	Form 4
Apr 28, 2026	Galligan Andrew H Director	Other	5,000	$115.00	$575K	0	Form 4
Apr 28, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Other	5,000	$115.00	$575K	0	Form 4
Apr 28, 2026	Heery Christopher CHIEF MEDICAL OFFICER	Other	23,749	$115.00	$2.73M⚡	0	Form 4
Apr 28, 2026	Elghandour Rami SEE REMARKS · Director	Other	101,164	$115.00	$11.63M⚡	0	Form 4
Apr 16, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Option	2,110	$8.66	$18K	67,048	Form 4
Apr 15, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Option	36,000	$8.66	$312K	64,938	Form 4
Mar 17, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Gift	5,000	—	—	28,938	Form 4
Mar 4, 2026	Elghandour Rami SEE REMARKS · Director	Gift	101,164	—	—	174,887	Form 4
Feb 27, 2026	Elghandour Rami SEE REMARKS · Director	Sale	89,916	$113.92	$10.24M⚡	276,051	Form 4
Feb 25, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale	11,219	$113.82	$1.28M⚡	33,938	Form 4
Feb 19, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale	2,879	$67.73	$195K	50,662	Form 4
Feb 19, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale	5,405	$68.57	$371K	45,257	Form 4
Feb 19, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale	100	$69.38	$7K	45,157	Form 4
Feb 17, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale	7,141	$69.21	$494K	57,691	Form 4
Feb 17, 2026	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale	4,150	$70.01	$291K	53,541	Form 4
Feb 11, 2026	Elghandour Rami SEE REMARKS · Director	Gift	198,000	—	—	365,967	Form 4
Feb 11, 2026	Elghandour Rami SEE REMARKS · Director	Gift	218,500	—	—	563,967	Form 4
Jan 20, 2026	Lubner David Charles Director	Option	6,000	$6.28	$38K	27,659	Form 4
Jan 20, 2026	Lubner David Charles Director	Sale	6,000	$75.00	$450K	21,659	Form 4
Jan 14, 2026	Heery Christopher CHIEF MEDICAL OFFICER	Sale	5,882	$68.51	$403K	23,749	Form 4
Jan 13, 2026	Heery Christopher CHIEF MEDICAL OFFICER	Sale	7,437	$65.51	$487K	29,631	Form 4
Jan 12, 2026	Heery Christopher CHIEF MEDICAL OFFICER	Sale	6,131	$64.15	$393K	37,068	Form 4

Carroll Jill

Director

Other

Date

Apr 28

1,479,148

Price

$115.00

Value

$170.10M ⚡

View Form 4 on SEC.gov

Behbahani Ali

Director

Other

Date

Apr 28

2,706

Price

$115.00

Value

$311K

View Form 4 on SEC.gov

Lubner David Charles

Director

Other

Date

Apr 28

21,659

Price

$115.00

Value

$2.49M ⚡

View Form 4 on SEC.gov

Galligan Andrew H

Director

Other

Date

Apr 28

5,000

Price

$115.00

Value

$575K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Other

Date

Apr 28

5,000

Price

$115.00

Value

$575K

View Form 4 on SEC.gov

Heery Christopher

CHIEF MEDICAL OFFICER

Other

Date

Apr 28

23,749

Price

$115.00

Value

$2.73M ⚡

View Form 4 on SEC.gov

Elghandour Rami

SEE REMARKS · Director

Other

Date

Apr 28

101,164

Price

$115.00

Value

$11.63M ⚡

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Option

Date

Apr 16

2,110

Price

$8.66

Value

$18K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Option

Date

Apr 15

36,000

Price

$8.66

Value

$312K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Gift

Date

Mar 17

5,000

Price

—

Value

—

View Form 4 on SEC.gov

Elghandour Rami

SEE REMARKS · Director

Gift

Date

Mar 4

101,164

Price

—

Value

—

View Form 4 on SEC.gov

Elghandour Rami

SEE REMARKS · Director

Sale

Date

Feb 27

89,916

Price

$113.92

Value

$10.24M ⚡

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Sale

Date

Feb 25

11,219

Price

$113.82

Value

$1.28M ⚡

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Sale

Date

Feb 19

2,879

Price

$67.73

Value

$195K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Sale

Date

Feb 19

5,405

Price

$68.57

Value

$371K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Sale

Date

Feb 19

100

Price

$69.38

Value

$7K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Sale

Date

Feb 17

7,141

Price

$69.21

Value

$494K

View Form 4 on SEC.gov

Gilson Michelle

CHIEF FINANCIAL OFFICER

Sale

Date

Feb 17

4,150

Price

$70.01

Value

$291K

View Form 4 on SEC.gov

Elghandour Rami

SEE REMARKS · Director

Gift

Date

Feb 11

198,000

Price

—

Value

—

View Form 4 on SEC.gov

Elghandour Rami

SEE REMARKS · Director

Gift

Date

Feb 11

218,500

Price

—

Value

—

View Form 4 on SEC.gov

Lubner David Charles

Director

Option

Date

Jan 20

6,000

Price

$6.28

Value

$38K

View Form 4 on SEC.gov

Lubner David Charles

Director

Sale

Date

Jan 20

6,000

Price

$75.00

Value

$450K

View Form 4 on SEC.gov

Heery Christopher

CHIEF MEDICAL OFFICER

Sale

Date

Jan 14

5,882

Price

$68.51

Value

$403K

View Form 4 on SEC.gov

Heery Christopher

CHIEF MEDICAL OFFICER

Sale

Date

Jan 13

7,437

Price

$65.51

Value

$487K

View Form 4 on SEC.gov

Heery Christopher

CHIEF MEDICAL OFFICER

Sale

Date

Jan 12

6,131

Price

$64.15

Value

$393K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 2

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About ACLX insider trading

ACLX insider trades

Arcellx, Inc. (ACLX) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Gilson Michelle (CHIEF FINANCIAL OFFICER), Elghandour Rami (SEE REMARKS · Director), Heery Christopher (CHIEF MEDICAL OFFICER). Over the past 12 months, 5 insiders have filed transactions with the SEC. ACLX insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Arcellx, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

ACLX insider trading · 5 questions

The insiders of Arcellx, Inc. (ACLX) include executives and directors such as Gilson Michelle (CHIEF FINANCIAL OFFICER), Elghandour Rami (SEE REMARKS · Director), Heery Christopher (CHIEF MEDICAL OFFICER), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

ACLX board member insider tradingwho are ACLX insidersACLX insider rosterArcellx, Inc. executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026