Quick Takeaways
- ACLX - Arcellx, Inc. has 23 insiders with reported activity on this page.
- Net insider value flow over the last year: -$19,711,545.
- Recent transaction rows are available for direct filing-level review.
- Info
- Insider Trading
- Financials
- Holders
Insider Transactions Reported by 23 Insiders of Arcellx, Inc.
- Symbol
- ACLX on Nasdaq
- Location
- Redwood City, CA
What Changed
- Buy value: ; sell value: $19,711,544.
- Net share flow: -211,791.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Official SEC Source
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$19,711,545.
Buys
$0
Shares: 0
Insiders: 0
Sells
$19,711,545
Shares: 211,791
Insiders: 5
Net
-$19,711,545
Shares: -211,791
Insiders: -5
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 146,260 | $0 | $14,611,067 | -$14,611,067 |
| 3-6 | 0 | 5,704 | $0 | $518,915 | -$518,915 |
| 6-9 | 0 | 43,092 | $0 | $3,511,801 | -$3,511,801 |
| 9-12 | 0 | 16,735 | $0 | $1,069,762 | -$1,069,762 |
Arcellx, Inc. executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| GILEAD SCIENCES, INC. | 10%+ Owner | $371,444,668 | Mixed | 28 Dec 2023 | ||
| NEA Partners 15, L.P. | 10%+ Owner | $262,260,666 | Mixed | 20 Dec 2022 | ||
| New Enterprise Associates 15, L.P. | 10%+ Owner | $262,260,666 | Mixed | 20 Dec 2022 | ||
| Novo Holdings A/S | 10%+ Owner | $222,004,412 | Mixed | 08 Feb 2022 | ||
| Lewis T. "rusty" Williams | Director | $115,792,551 | Mixed | 08 Feb 2022 | ||
| SR ONE CAPITAL MANAGEMENT, LLC | 10%+ Owner | $91,677,287 | Mixed | 11 May 2023 | ||
| Rami Elghandour | President, CEO and Chairman of the Board, Director | $34,559,223 | -$10,243,267 | -23% | Mixed | 04 Mar 2026 |
| Michelle Gilson | Chief Financial Officer | $13,360,606 | -$4,419,000 | -25% | Mixed | 17 Mar 2026 |
| Christopher Heery | Chief Medical Officer | $1,627,129 | -$4,314,293 | -73% | Filing P/S | 14 Jan 2026 |
| David Charles Lubner | Director | $1,624,425 | -$450,000 | -22% | Filing P/S | 20 Jan 2026 |
| Andrew H. Galligan | Director | $358,200 | Mixed | 29 May 2025 | ||
| Ali Behbahani | Director | $303,561 | Mixed | 12 Aug 2025 | ||
| Mohamad Makhzoumi | 10%+ Owner | $15,641 | Mixed | 20 Dec 2022 | ||
| Peter W. Sonsini | 10%+ Owner | $663 | Mixed | 20 Dec 2022 | ||
| Kavita Patel | Director | $0 | -$284,985 | -100% | Mixed | 10 Jun 2025 |
| Forest Baskett | 10%+ Owner | Mixed | 20 Dec 2022 | |||
| Olivia C. Ware | Director | Mixed | 29 May 2025 | |||
| Scott D. Sandell | 10%+ Owner | Mixed | 23 Dec 2022 | |||
| Jill Carroll | Director | Mixed | 29 May 2025 | |||
| Lance E. Thibault | Interim Chief Financial Officer Exhibit 24 - Power of Attorney | Mixed | 03 Feb 2022 | |||
| Kristin Myers | Director | Mixed | 29 May 2025 | |||
| Anthony A. Florence Jr. | 10%+ Owner | Mixed | 20 Dec 2022 | |||
| Derek Yoon | Director | Mixed | 28 May 2024 |
Top shareholders of Arcellx, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| T. Rowe Price Investment Management, Inc. |
13F
13D/G
|
Company |
4.5%
from 13D/G
|
10,560,425
|
$688,540,000 | — | 31 Dec 2025 | |
| GILEAD SCIENCES, INC. |
13D/G
3/4/5
13F
|
10%+ Owner · Company |
12%
|
6,720,803
|
$457,955,516 | $0 | 23 Feb 2026 | |
| Paradigm Biocapital Advisors LP |
13D/G
13F
|
Company |
9.9%
|
5,724,016
|
$379,330,540 | $0 | 31 Dec 2025 | |
| Rami Elghandour |
13D/G
3/4/5
|
President, CEO and Chairman of the Board, Director |
6.4%
|
3,938,771
|
$268,387,856 | -$3,976,719 | 22 Feb 2026 | |
| VANGUARD GROUP INC |
13F
|
Company |
6.9%
|
4,081,519
|
$266,115,040 | — | 31 Dec 2025 | |
| NEA Partners 15, L.P. |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
4,745,262
|
$262,260,666 | — | 20 Dec 2022 | |
| New Enterprise Associates 15, L.P. |
3/4/5
13D/G
|
10%+ Owner · Scott D. Sandell |
5.3%
from 13D/G
|
4,745,262
|
$262,260,666 | — | 20 Dec 2022 | |
| FMR LLC |
13F
13D/G
|
Company |
0.5%
from 13D/G
|
3,563,728
|
$232,355,097 | — | 31 Dec 2025 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
6.4%
from 13D/G
|
3,548,787
|
$231,380,928 | — | 31 Dec 2025 | |
| Novo Holdings A/S |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
4,016,878
|
$222,004,412 | — | 08 Feb 2022 | |
| NEA Management Company, LLC |
13F
|
Company |
5.2%
|
3,045,262
|
$198,551,082 | — | 31 Dec 2025 | |
| Vestal Point Capital, LP |
13D/G
13F
|
Company |
5.1%
|
2,925,000
|
$193,839,750 | $0 | 31 Dec 2025 | |
| PERCEPTIVE ADVISORS LLC |
13D/G
13F
|
Company |
4.5%
|
2,478,000
|
$162,432,900 | -$29,397,733 | 30 Jun 2025 | |
| SR ONE CAPITAL MANAGEMENT, LP |
13F
|
Company |
4%
|
2,346,630
|
$153,000,276 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
3.4%
|
1,998,503
|
$130,302,396 | — | 31 Dec 2025 | |
| Lewis T. "rusty" Williams |
3/4/5
|
Director |
—
class O/S missing
|
2,095,114
|
$115,792,551 | — | 08 Feb 2022 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
2.7%
|
1,610,801
|
$105,025,000 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
2.5%
|
1,500,223
|
$97,814,539 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
2.5%
|
1,454,477
|
$94,831,912 | — | 31 Dec 2025 | |
| SR ONE CAPITAL MANAGEMENT, LLC |
3/4/5
|
10%+ Owner |
—
class O/S missing
|
1,658,780
|
$91,677,287 | — | 11 May 2023 | |
| RA CAPITAL MANAGEMENT, L.P. |
13D/G
13F
|
Company |
2.2%
|
1,267,156
|
$83,974,428 | $0 | 31 Dec 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.6%
|
958,057
|
$62,478,756 | — | 31 Dec 2025 | |
| JANUS HENDERSON GROUP PLC |
13F
|
Company |
1.6%
|
919,578
|
$59,957,552 | — | 31 Dec 2025 | |
| Woodline Partners LP |
13F
|
Company |
1.3%
|
737,824
|
$48,106,125 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
1.1%
|
668,480
|
$43,584,896 | — | 31 Dec 2025 | |
| BAMCO INC /NY/ |
13F
|
Company |
1%
|
609,697
|
$39,752,244 | — | 31 Dec 2025 | |
| Affinity Asset Advisors, LLC |
13F
|
Company |
0.89%
|
523,725
|
$34,146,870 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
0.88%
|
518,404
|
$33,799,946 | — | 31 Dec 2025 | |
| LORD, ABBETT & CO. LLC |
13F
|
Company |
0.76%
|
449,634
|
$29,316,000 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.73%
|
427,769
|
$27,890,538 | — | 31 Dec 2025 | |
| AMERICAN CENTURY COMPANIES INC |
13F
|
Company |
0.71%
|
419,080
|
$27,324,142 | — | 31 Dec 2025 | |
| Hudson Bay Capital Management LP |
13F
|
Company |
0.68%
|
400,942
|
$26,141,418 | — | 31 Dec 2025 | |
| Pictet Asset Management Holding SA |
13F
|
Company |
0.58%
|
342,612
|
$22,338,302 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.58%
|
339,813
|
$22,155,808 | — | 31 Dec 2025 | |
| Hood River Capital Management LLC |
13F
|
Company |
0.57%
|
335,500
|
$21,874,600 | — | 31 Dec 2025 | |
| STEMPOINT CAPITAL LP |
13F
|
Company |
0.56%
|
332,860
|
$21,702,472 | — | 31 Dec 2025 | |
| Fisher Asset Management, LLC |
13F
|
Company |
0.55%
|
322,855
|
$21,050,146 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.55%
|
321,793
|
$20,980,903 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
0.54%
|
316,612
|
$20,643,103 | — | 31 Dec 2025 | |
| TD ASSET MANAGEMENT INC |
13F
|
Company |
0.51%
|
300,856
|
$19,615,811 | — | 31 Dec 2025 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.4%
|
233,592
|
$15,230,199 | — | 31 Dec 2025 | |
| AJU IB Investment Co., Ltd. |
13F
|
Company |
0.38%
|
223,486
|
$14,571,287 | — | 31 Dec 2025 | |
| ExodusPoint Capital Management, LP |
13F
|
Company |
0.37%
|
217,424
|
$14,176,045 | — | 31 Dec 2025 | |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
|
Company |
0.36%
|
214,776
|
$14,003,396 | — | 31 Dec 2025 | |
| Michelle Gilson |
3/4/5
|
CHIEF FINANCIAL OFFICER |
—
mixed-class rows
|
95,528
mixed-class rows
|
$13,360,606 | -$4,419,000 | 17 Mar 2026 | |
| Integral Health Asset Management, LLC |
13F
|
Company |
0.34%
|
200,000
|
$13,040,000 | — | 31 Dec 2025 | |
| BARCLAYS PLC |
13F
|
Company |
0.33%
|
196,772
|
$12,829,534 | — | 31 Dec 2025 | |
| Rock Springs Capital Management LP |
13F
|
Company |
0.29%
|
169,859
|
$11,074,807 | — | 31 Dec 2025 | |
| VOYA INVESTMENT MANAGEMENT LLC |
13F
|
Company |
0.29%
|
168,680
|
$10,997,936 | — | 31 Dec 2025 | |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC |
13F
|
Company |
0.27%
|
161,035
|
$10,499,481 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for Arcellx, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Michelle Gilson | ACLX | Common Stock | Gift | -14.7% | -5,000 | 28,938 | 17 Mar 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Gift | -36.6% | -101,164 | 174,887 | 04 Mar 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Sale | -24.6% | $10,243,267 | $113.92 | -89,916 | 276,051 | 27 Feb 2026 | Direct |
| Michelle Gilson | ACLX | Common Stock | Sale | -24.8% | $1,276,954 | $113.82 | -11,219 | 33,938 | 25 Feb 2026 | Direct |
| Michelle Gilson | ACLX | Common Stock | Sale | -15.7% | $572,568 | $68.29 | -8,384 | 45,157 | 19 Feb 2026 | Direct |
| Michelle Gilson | ACLX | Common Stock | Sale | -17.4% | $784,783 | $69.51 | -11,291 | 53,541 | 17 Feb 2026 | Direct |
| Rami Elghandour | ACLX | Common Stock | Gift | -35.1% | -198,000 | 365,967 | 11 Feb 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Gift | -27.9% | -218,500 | 563,967 | 11 Feb 2026 | Direct | ||
| David Charles Lubner | ACLX | Common Stock | Sale | -21.7% | $450,000 | $75.00 | -6,000 | 21,659 | 20 Jan 2026 | Direct |
| David Charles Lubner | ACLX | Common Stock | Options Exercise | 27.7% | 6,000 | 27,659 | 20 Jan 2026 | Direct | ||
| David Charles Lubner | ACLX | Stock Option (right to buy) | Options Exercise | -9.17% | -6,000 | 59,405 | 20 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Sale | -19.8% | $402,997 | $68.51 | -5,882 | 23,749 | 14 Jan 2026 | Direct |
| Christopher Heery | ACLX | Common Stock | Sale | -20.1% | $487,213 | $65.51 | -7,437 | 29,631 | 13 Jan 2026 | Direct |
| Christopher Heery | ACLX | Common Stock | Sale | -14.2% | $393,286 | $64.15 | -6,131 | 37,068 | 12 Jan 2026 | Direct |
| Rami Elghandour | ACLX | Common Stock | Options Exercise | 7.71% | 55,991 | 782,467 | 06 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 46.3% | 20,530 | 64,832 | 06 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Options Exercise | 43.4% | 13,064 | 43,199 | 06 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Options Exercise | 43.4% | 13,064 | 43,199 | 06 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Restricted Stock Unit | Options Exercise | -25% | -13,064 | 39,194 | 06 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Options Exercise | 7.71% | 55,991 | 782,467 | 06 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Restricted Stock Unit | Options Exercise | -25% | -55,991 | 167,973 | 06 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 46.3% | 20,530 | 64,832 | 06 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Restricted Stock Unit | Options Exercise | -25% | -20,530 | 61,590 | 06 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Options Exercise | 7.89% | 53,098 | 726,476 | 03 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 53% | 15,340 | 44,302 | 03 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Options Exercise | 121.3% | 16,520 | 30,135 | 03 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Options Exercise | 121.3% | 16,520 | 30,135 | 03 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Restricted Stock Unit | Options Exercise | -100% | -16,520 | 0 | 03 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Options Exercise | 7.89% | 53,098 | 726,476 | 03 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Restricted Stock Unit | Options Exercise | -100% | -53,098 | 0 | 03 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 53% | 15,340 | 44,302 | 03 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Restricted Stock Unit | Options Exercise | -100% | -15,340 | 0 | 03 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Options Exercise | 8.98% | 55,459 | 673,378 | 02 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 242.1% | 20,496 | 28,962 | 02 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Options Exercise | 2192.1% | 13,021 | 13,615 | 02 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Options Exercise | 2192.1% | 13,021 | 13,615 | 02 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Restricted Stock Unit | Options Exercise | -50% | -13,021 | 13,021 | 02 Jan 2026 | Direct | ||
| Christopher Heery | ACLX | Restricted Stock Unit | Award | 67,708 | 67,708 | 02 Jan 2026 | Direct | |||
| Rami Elghandour | ACLX | Common Stock | Options Exercise | 8.98% | 55,459 | 673,378 | 02 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Restricted Stock Unit | Options Exercise | -50% | -55,459 | 55,459 | 02 Jan 2026 | Direct | ||
| Rami Elghandour | ACLX | Restricted Stock Unit | Award | 208,333 | 208,333 | 02 Jan 2026 | Direct | |||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 242.1% | 20,496 | 28,962 | 02 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Restricted Stock Unit | Options Exercise | -50% | -20,496 | 20,496 | 02 Jan 2026 | Direct | ||
| Michelle Gilson | ACLX | Restricted Stock Unit | Award | 88,542 | 88,542 | 02 Jan 2026 | Direct | |||
| Christopher Heery | ACLX | Common Stock | Sale | -54.5% | $30,600 | $90.00 | -340 | 284 | 17 Nov 2025 | Direct |
| Michelle Gilson | ACLX | Common Stock | Sale | -38.8% | $488,315 | $91.04 | -5,364 | 8,466 | 15 Oct 2025 | Direct |
| Michelle Gilson | ACLX | Common Stock | Sale | -7.14% | $91,733 | $86.22 | -1,064 | 13,830 | 06 Oct 2025 | Direct |
| Michelle Gilson | ACLX | Common Stock | Sale | -24.7% | $419,870 | $86.00 | -4,882 | 14,894 | 03 Oct 2025 | Direct |
| Christopher Heery | ACLX | Common Stock | Sale | -97.1% | $1,709,723 | $81.28 | -21,034 | 624 | 30 Sep 2025 | Direct |
| Christopher Heery | ACLX | Common Stock | Sale | -0.34% | $5,852 | $80.16 | -73 | 21,658 | 29 Sep 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.