Quick Takeaways
- ACLX - Arcellx, Inc. has 23 insiders with reported activity on this page.
- Net insider value flow over the last year: -$19,615,245.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 23 Insiders of Arcellx, Inc.
- Symbol
- ACLX on Nasdaq
- Location
- Redwood City, CA
What Changed
- Buy value: ; sell value: $19,615,244.
- Net share flow: -210,291.
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.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsNet insider flow leans to selling over the last 12 months. Net value: -$19,615,245.
Buys
$0
Shares: 0
Insiders: 0
Sells
$19,615,245
Shares: 210,291
Insiders: 5
Net
-$19,615,245
Shares: -210,291
Insiders: -5
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 120,810 | $0 | $12,877,572 | -$12,877,572 |
| 3-6 | 0 | 25,790 | $0 | $1,764,096 | -$1,764,096 |
| 6-9 | 0 | 48,456 | $0 | $4,000,116 | -$4,000,116 |
| 9-12 | 0 | 15,235 | $0 | $973,462 | -$973,462 |
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 | ||
| Michelle Gilson | Chief Financial Officer | $9,500,159 | -$4,419,000 | -32% | Mixed | 28 Apr 2026 |
| Mohamad Makhzoumi | 10%+ Owner | $15,641 | Mixed | 20 Dec 2022 | ||
| Peter W. Sonsini | 10%+ Owner | $663 | Mixed | 20 Dec 2022 | ||
| Rami Elghandour | President, CEO and Chairman of the Board, Director | $0 | -$10,243,267 | -100% | Mixed | 28 Apr 2026 |
| Ali Behbahani | Director | $0 | Mixed | 28 Apr 2026 | ||
| Andrew H. Galligan | Director | $0 | Mixed | 28 Apr 2026 | ||
| David Charles Lubner | Director | $0 | -$450,000 | -100% | Mixed | 28 Apr 2026 |
| Jill Carroll | Director | $0 | Mixed | 28 Apr 2026 | ||
| Christopher Heery | Chief Medical Officer | $0 | -$4,314,293 | -100% | Mixed | 28 Apr 2026 |
| Kavita Patel | Director | $0 | -$188,685 | -100% | Mixed | 28 Apr 2026 |
| Forest Baskett | 10%+ Owner | Mixed | 20 Dec 2022 | |||
| Scott D. Sandell | 10%+ Owner | Mixed | 23 Dec 2022 | |||
| Lance E. Thibault | Interim Chief Financial Officer Exhibit 24 - Power of Attorney | Mixed | 03 Feb 2022 | |||
| Olivia C. Ware | Director | Mixed | 28 Apr 2026 | |||
| Kristin Myers | Director | Mixed | 28 Apr 2026 | |||
| Derek Yoon | Director | Mixed | 28 May 2024 | |||
| Anthony A. Florence Jr. | 10%+ Owner | Mixed | 20 Dec 2022 |
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. |
13F
13D/G
3/4/5
|
Company · 10%+ Owner |
100%
from 13D/G
|
6,720,803
|
$438,196,356 | — | 31 Dec 2025 | |
| Paradigm Biocapital Advisors LP |
13D/G
13F
|
Company |
9.9%
|
5,724,016
|
$379,330,540 | $0 | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
4081519%
|
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
|
10%+ Owner |
—
class O/S missing
|
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 |
3045262%
|
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 |
2346630%
|
2,346,630
|
$153,000,276 | — | 31 Dec 2025 | |
| STATE STREET CORP |
13F
|
Company |
1998503%
|
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 |
1610801%
|
1,610,801
|
$105,025,000 | — | 31 Dec 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
1500223%
|
1,500,223
|
$97,814,539 | — | 31 Dec 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
1454477%
|
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 |
958057%
|
958,057
|
$62,478,756 | — | 31 Dec 2025 | |
| JANUS HENDERSON GROUP PLC |
13F
|
Company |
919578%
|
919,578
|
$59,957,552 | — | 31 Dec 2025 | |
| Woodline Partners LP |
13F
|
Company |
737824%
|
737,824
|
$48,106,125 | — | 31 Dec 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
668480%
|
668,480
|
$43,584,896 | — | 31 Dec 2025 | |
| BAMCO INC /NY/ |
13F
|
Company |
609697%
|
609,697
|
$39,752,244 | — | 31 Dec 2025 | |
| Affinity Asset Advisors, LLC |
13F
|
Company |
523725%
|
523,725
|
$34,146,870 | — | 31 Dec 2025 | |
| MORGAN STANLEY |
13F
|
Company |
518404%
|
518,404
|
$33,799,946 | — | 31 Dec 2025 | |
| LORD, ABBETT & CO. LLC |
13F
|
Company |
449634%
|
449,634
|
$29,316,000 | — | 31 Dec 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
427769%
|
427,769
|
$27,890,538 | — | 31 Dec 2025 | |
| AMERICAN CENTURY COMPANIES INC |
13F
|
Company |
419080%
|
419,080
|
$27,324,142 | — | 31 Dec 2025 | |
| Hudson Bay Capital Management LP |
13F
|
Company |
400942%
|
400,942
|
$26,141,418 | — | 31 Dec 2025 | |
| Pictet Asset Management Holding SA |
13F
|
Company |
342612%
|
342,612
|
$22,338,302 | — | 31 Dec 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
339813%
|
339,813
|
$22,155,808 | — | 31 Dec 2025 | |
| Hood River Capital Management LLC |
13F
|
Company |
335500%
|
335,500
|
$21,874,600 | — | 31 Dec 2025 | |
| STEMPOINT CAPITAL LP |
13F
|
Company |
332860%
|
332,860
|
$21,702,472 | — | 31 Dec 2025 | |
| Fisher Asset Management, LLC |
13F
|
Company |
322855%
|
322,855
|
$21,050,146 | — | 31 Dec 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
321793%
|
321,793
|
$20,980,903 | — | 31 Dec 2025 | |
| UBS Group AG |
13F
|
Company |
316612%
|
316,612
|
$20,643,103 | — | 31 Dec 2025 | |
| TD ASSET MANAGEMENT INC |
13F
|
Company |
300856%
|
300,856
|
$19,615,811 | — | 31 Dec 2025 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
233592%
|
233,592
|
$15,230,199 | — | 31 Dec 2025 | |
| AJU IB Investment Co., Ltd. |
13F
|
Company |
223486%
|
223,486
|
$14,571,287 | — | 31 Dec 2025 | |
| ExodusPoint Capital Management, LP |
13F
|
Company |
217424%
|
217,424
|
$14,176,045 | — | 31 Dec 2025 | |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
|
Company |
214776%
|
214,776
|
$14,003,396 | — | 31 Dec 2025 | |
| Integral Health Asset Management, LLC |
13F
|
Company |
200000%
|
200,000
|
$13,040,000 | — | 31 Dec 2025 | |
| BARCLAYS PLC |
13F
|
Company |
196772%
|
196,772
|
$12,829,534 | — | 31 Dec 2025 | |
| Rock Springs Capital Management LP |
13F
|
Company |
169859%
|
169,859
|
$11,074,807 | — | 31 Dec 2025 | |
| VOYA INVESTMENT MANAGEMENT LLC |
13F
|
Company |
168680%
|
168,680
|
$10,997,936 | — | 31 Dec 2025 | |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC |
13F
|
Company |
161035%
|
161,035
|
$10,499,481 | — | 31 Dec 2025 | |
| CITIGROUP INC |
13F
|
Company |
156519%
|
156,519
|
$10,205,039 | — | 31 Dec 2025 | |
| Catalio Capital Management, LP |
13F
|
Company |
156109%
|
156,109
|
$10,178,307 | — | 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Jill Carroll | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -1,479,148 | 0 | 28 Apr 2026 | See Note 2 | ||
| Jill Carroll | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -28,644 | 0 | 28 Apr 2026 | Direct | ||
| Ali Behbahani | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -2,706 | 0 | 28 Apr 2026 | See Note 2 | ||
| Ali Behbahani | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -1,925 | 0 | 28 Apr 2026 | Direct | ||
| Ali Behbahani | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -28,644 | 0 | 28 Apr 2026 | Direct | ||
| Olivia C. Ware | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -65,450 | 0 | 28 Apr 2026 | Direct | ||
| Kavita Patel | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -76,234 | 0 | 28 Apr 2026 | Direct | ||
| Kristin Myers | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -18,613 | 0 | 28 Apr 2026 | Direct | ||
| David Charles Lubner | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -21,659 | 0 | 28 Apr 2026 | Direct | ||
| David Charles Lubner | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -195,007 | 0 | 28 Apr 2026 | Direct | ||
| Andrew H. Galligan | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -5,000 | 0 | 28 Apr 2026 | By trust | ||
| Andrew H. Galligan | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -18,613 | 0 | 28 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -5,000 | 0 | 28 Apr 2026 | By foundation | ||
| Michelle Gilson | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -67,048 | 0 | 28 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Performance-based Restricted Stock Unit | Disposed to Issuer | -100% | -59,028 | 0 | 28 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Performance-based Restricted Stock Unit | Award | 59,028 | 59,028 | 28 Apr 2026 | Direct | |||
| Michelle Gilson | ACLX | Restricted Stock Unit | Disposed to Issuer | -100% | -170,628 | 0 | 28 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -238,097 | 0 | 28 Apr 2026 | Direct | ||
| Christopher Heery | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -23,749 | 0 | 28 Apr 2026 | Direct | ||
| Christopher Heery | ACLX | Performance-based Restricted Stock Unit | Disposed to Issuer | -100% | -45,138 | 0 | 28 Apr 2026 | Direct | ||
| Christopher Heery | ACLX | Performance-based Restricted Stock Unit | Award | 45,138 | 45,138 | 28 Apr 2026 | Direct | |||
| Christopher Heery | ACLX | Restricted Stock Unit | Disposed to Issuer | -100% | -119,923 | 0 | 28 Apr 2026 | Direct | ||
| Christopher Heery | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -363,259 | 0 | 28 Apr 2026 | Direct | ||
| Rami Elghandour | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -101,164 | 0 | 28 Apr 2026 | By foundation | ||
| Rami Elghandour | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -416,500 | 0 | 28 Apr 2026 | By trust | ||
| Rami Elghandour | ACLX | Common Stock | Disposition pursuant to a tender of shares in a change of control transaction | -100% | -174,887 | 0 | 28 Apr 2026 | Direct | ||
| Rami Elghandour | ACLX | Performance-based Restricted Stock Unit | Disposed to Issuer | -100% | -571,021 | 0 | 28 Apr 2026 | Direct | ||
| Rami Elghandour | ACLX | Performance-based Restricted Stock Unit | Award | 571,021 | 284,388 | 28 Apr 2026 | Direct | |||
| Rami Elghandour | ACLX | Restricted Stock Unit | Disposed to Issuer | -100% | -431,765 | 0 | 28 Apr 2026 | Direct | ||
| Rami Elghandour | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -810,102 | 0 | 28 Apr 2026 | By trust | ||
| Rami Elghandour | ACLX | Stock Option (right to buy) | Disposed to Issuer | -100% | -2,526,637 | 0 | 28 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 3.25% | 2,110 | 67,048 | 16 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Stock Option (right to buy) | Options Exercise | -4.99% | -2,110 | 40,205 | 16 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Common Stock | Options Exercise | 124.4% | 36,000 | 64,938 | 15 Apr 2026 | Direct | ||
| Michelle Gilson | ACLX | Stock Option (right to buy) | Options Exercise | -46% | -36,000 | 42,315 | 15 Apr 2026 | Direct | ||
| 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 |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.