Arcellx, Inc. (ACLX) has 15 known insider and institutional holders on record. The largest holder is BASKETT FOREST with 6,745,262 shares. Other notable holders include GILEAD SCIENCES, INC. and New Enterprise Associates 15, L.P..
Over the last 12 months, insiders have made 43 transactions in ACLX stock — 8 buys (valued at $3.15M) and 21 sells (valued at $16.83M). Insider selling has exceeded buying during this period.
ACLX Insider Ownership
Top Holder
BASKETT FOREST
6,745,262 shares
Buys (12 mo)
8
$3.15M value
Sells (12 mo)
21
$16.83M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Baskett Forest |
Director |
6,745,262 |
2022-06-23 |
|
| 2 |
Gilead Sciences, Inc. |
10 Percent Owner |
6,720,803 |
2023-12-28 |
|
| 3 |
New Enterprise Associates 15, L.p. |
Director |
4,745,262 |
2022-12-22 |
|
| 4 |
Sr One Capital Management, Llc |
10 Percent Owner |
1,658,780 |
2023-05-15 |
|
| 5 |
Elghandour Rami |
See Remarks |
174,887 |
2026-03-04 |
|
| 6 |
Gilson Michelle |
Chief Financial Officer |
28,938 |
2026-03-19 |
|
| 7 |
Heery Christopher |
Chief Medical Officer |
23,749 |
2026-01-14 |
|
| 8 |
Lubner David Charles |
Director |
21,659 |
2026-01-20 |
|
| 9 |
Patel Kavita |
Director |
9,174 |
2025-05-30 |
|
| 10 |
Ware Olivia C |
Director |
9,174 |
2025-05-30 |
|
| 11 |
Carroll Jill |
Director |
9,174 |
2025-05-30 |
|
| 12 |
Yoon Derek |
Director |
8,011 |
2024-06-06 |
|
| 13 |
Behbahani Ali |
Director |
1,925 |
2025-08-14 |
|
| 14 |
Galligan Andrew H |
Director |
1,784 |
2025-05-30 |
|
| 15 |
Myers Kristin |
Director |
1,784 |
2025-05-30 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-17 |
Gilson Michelle |
Chief Financial Officer |
Gift (Given) |
5,000 |
- |
- |
| 2026-03-04 |
Elghandour Rami |
See Remarks |
Gift (Given) |
101,164 |
- |
- |
| 2026-02-27 |
Elghandour Rami |
See Remarks |
Informative Sell |
89,916 |
$113.92 |
$10.24M |
| 2026-02-25 |
Gilson Michelle |
Chief Financial Officer |
Informative Sell |
11,219 |
$113.82 |
$1.28M |
| 2026-02-19 |
Gilson Michelle |
Chief Financial Officer |
Informative Sell |
100 |
$69.38 |
$6.94K |
| 2026-02-17 |
Gilson Michelle |
Chief Financial Officer |
Informative Sell |
4,150 |
$70.01 |
$290.55K |
| 2026-02-11 |
Elghandour Rami |
See Remarks |
Gift (Given) |
218,500 |
- |
- |
| 2026-01-20 |
Lubner David Charles |
Director |
Informative Sell |
6,000 |
$75.00 |
$450K |
| 2026-01-14 |
Heery Christopher |
Chief Medical Officer |
Informative Sell |
5,882 |
$68.51 |
$403K |
| 2026-01-13 |
Heery Christopher |
Chief Medical Officer |
Informative Sell |
7,437 |
$65.51 |
$487.21K |
| 2026-01-12 |
Heery Christopher |
Chief Medical Officer |
Informative Sell |
6,131 |
$64.15 |
$393.29K |
| 2026-01-06 |
Gilson Michelle |
Chief Financial Officer |
Option Exercise (Sell) |
20,530 |
- |
- |
| 2026-01-03 |
Gilson Michelle |
Chief Financial Officer |
Option Exercise (Sell) |
15,340 |
- |
- |
| 2026-01-02 |
Gilson Michelle |
Chief Financial Officer |
Option Exercise (Sell) |
20,496 |
- |
- |
| 2026-01-06 |
Heery Christopher |
Chief Medical Officer |
Option Exercise (Sell) |
13,064 |
- |
- |
| 2026-01-03 |
Heery Christopher |
Chief Medical Officer |
Option Exercise (Sell) |
16,520 |
- |
- |
| 2026-01-02 |
Heery Christopher |
Chief Medical Officer |
Option Exercise (Sell) |
13,021 |
- |
- |
| 2026-01-06 |
Elghandour Rami |
See Remarks |
Option Exercise (Sell) |
55,991 |
- |
- |
| 2026-01-03 |
Elghandour Rami |
See Remarks |
Option Exercise (Sell) |
53,098 |
- |
- |
| 2026-01-02 |
Elghandour Rami |
See Remarks |
Option Exercise (Sell) |
55,459 |
- |
- |
| 2025-11-17 |
Heery Christopher |
Chief Medical Officer |
Informative Sell |
340 |
$90.00 |
$30.6K |
| 2025-10-15 |
Gilson Michelle |
Chief Financial Officer |
Informative Sell |
5,364 |
$91.04 |
$488.32K |
| 2025-10-06 |
Gilson Michelle |
Chief Financial Officer |
Informative Sell |
1,064 |
$86.22 |
$91.73K |
| 2025-10-03 |
Gilson Michelle |
Chief Financial Officer |
Informative Sell |
4,882 |
$86.00 |
$419.87K |
| 2025-09-30 |
Heery Christopher |
Chief Medical Officer |
Informative Sell |
1,530 |
$82.20 |
$125.76K |
