Key facts
- ACLX - Arcellx, Inc. has 23 insiders with reported activity on this page.
- Net insider value flow over the last year: -$19,527,600.
- 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
Change
- Buy value: ; sell value: $19,527,599.
- Net share flow: -208,791.
Research use
- 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.
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: -$19,527,600.
Buys
$0
Shares: 0
Insiders: 0
Sells
$19,527,600
Shares: 208,791
Insiders: 5
Net
-$19,527,600
Shares: -208,791
Insiders: -5
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 146,260 | $0 | $14,611,067 | -$14,611,067 |
| 6-9 | 0 | 48,796 | $0 | $4,030,716 | -$4,030,716 |
| 9-12 | 0 | 13,735 | $0 | $885,817 | -$885,817 |
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 | -$3,634,223 | -28% | 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 | -$101,040 | -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 first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings 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 |
|---|---|---|---|---|---|---|---|---|
| GILEAD SCIENCES, INC. |
13F
13D/G
3/4/5
|
Company · 10%+ Owner |
100%
from 13D/G
|
6,720,803
|
$771,682,600 | — | 31 Mar 2026 | |
| Paradigm Biocapital Advisors LP |
13F
13D/G
|
Company |
9.9%
from 13D/G
|
5,774,016
|
$662,972,517 | — | 31 Mar 2026 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
6.4%
from 13D/G
|
3,945,238
|
$452,992,229 | — | 31 Mar 2026 | |
| T. Rowe Price Investment Management, Inc. |
13F
13D/G
|
Company |
4.5%
from 13D/G
|
2,255,878
|
$259,020,000 | — | 31 Mar 2026 | |
| PERCEPTIVE ADVISORS LLC |
13D/G
|
— |
4.5%
|
2,478,000
|
$162,432,900 | -$29,397,733 | 30 Jun 2025 | |
| RA CAPITAL MANAGEMENT, L.P. |
13D/G
|
— |
2.2%
|
1,267,156
|
$83,974,428 | $0 | 31 Dec 2025 | |
| FMR LLC |
13D/G
13F
|
Company |
0.5%
|
309,117
|
$21,601,128 | -$227,432,217 | 27 Feb 2026 | |
| NEA Management Company, LLC |
13F
|
Company |
3045262%
|
3,045,262
|
$349,656,983 | — | 31 Mar 2026 | |
| Pentwater Capital Management LP |
13F
|
Company |
2870000%
|
2,870,000
|
$329,533,400 | — | 31 Mar 2026 | |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
|
Company |
2425218%
|
2,425,218
|
$278,463,531 | — | 31 Mar 2026 | |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
|
Company |
2424818%
|
2,424,818
|
$278,417,603 | — | 31 Mar 2026 | |
| SR ONE CAPITAL MANAGEMENT, LP |
13F
|
Company |
2346630%
|
2,346,630
|
$269,440,057 | — | 31 Mar 2026 | |
| FIL Ltd |
13F
|
Company |
2339192%
|
2,339,192
|
$268,586,025 | — | 31 Mar 2026 | |
| HBK INVESTMENTS L P |
13F
|
Company |
2278517%
|
2,278,517
|
$261,619,322 | — | 31 Mar 2026 | |
| STATE STREET CORP |
13F
|
Company |
1675895%
|
1,675,895
|
$192,426,264 | — | 31 Mar 2026 | |
| GLAZER CAPITAL, LLC |
13F
|
Company |
1507128%
|
1,507,128
|
$173,048,000 | — | 31 Mar 2026 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
1312155%
|
1,312,155
|
$150,661,637 | — | 31 Mar 2026 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1028666%
|
1,028,666
|
$118,135,702 | — | 31 Mar 2026 | |
| MORGAN STANLEY |
13F
|
Company |
925813%
|
925,813
|
$106,301,939 | — | 31 Mar 2026 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
593573%
|
593,573
|
$68,124,374 | — | 31 Mar 2026 | |
| DAVIDSON KEMPNER CAPITAL MANAGEMENT LP |
13F
|
Company |
559644%
|
559,644
|
$64,258,324 | — | 31 Mar 2026 | |
| ALLIANCEBERNSTEIN L.P. |
13F
|
Company |
544227%
|
544,227
|
$35,483,600 | — | 31 Mar 2026 | |
| TIG Advisors, LLC |
13F
|
Company |
541378%
|
541,378
|
$62,161,022 | — | 31 Mar 2026 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
502846%
|
502,846
|
$57,736,778 | — | 31 Mar 2026 | |
| BALYASNY ASSET MANAGEMENT L.P. |
13F
|
Company |
479763%
|
479,763
|
$55,086,388 | — | 31 Mar 2026 | |
| TUDOR INVESTMENT CORP ET AL |
13F
|
Company |
462588%
|
462,588
|
$53,114,354 | — | 31 Mar 2026 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
452333%
|
452,333
|
$51,936,876 | — | 31 Mar 2026 | |
| Magnetar Financial LLC |
13F
|
Company |
394931%
|
394,931
|
$45,345,977 | — | 31 Mar 2026 | |
| ALPINE ASSOCIATES MANAGEMENT INC. |
13F
|
Company |
378000%
|
378,000
|
$43,401,960 | — | 31 Mar 2026 | |
| NEXPOINT ASSET MANAGEMENT, L.P. |
13F
|
Company |
373150%
|
373,150
|
$42,845,083 | — | 31 Mar 2026 | |
| Affinity Asset Advisors, LLC |
13F
|
Company |
362764%
|
362,764
|
$41,652,562 | — | 31 Mar 2026 | |
| NORTHERN TRUST CORP |
13F
|
Company |
350065%
|
350,065
|
$40,194,463 | — | 31 Mar 2026 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
346092%
|
346,092
|
$39,738,283 | — | 31 Mar 2026 | |
| VANGUARD FIDUCIARY TRUST CO |
13F
|
Company |
308546%
|
308,546
|
$35,427,252 | — | 31 Mar 2026 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
303847%
|
303,847
|
$34,887,713 | — | 31 Mar 2026 | |
| First Trust Capital Management L.P. |
13F
|
Company |
238235%
|
238,235
|
$27,354,143 | — | 31 Mar 2026 | |
| AQR Arbitrage LLC |
13F
|
Company |
231730%
|
231,730
|
$26,607,239 | — | 31 Mar 2026 | |
| AJU IB Investment Co., Ltd. |
13F
|
Company |
223486%
|
223,486
|
$25,660,663 | — | 31 Mar 2026 | |
| LMR Partners LLP |
13F
|
Company |
212495%
|
212,495
|
$24,398,676 | — | 31 Mar 2026 | |
| BARCLAYS PLC |
13F
|
Company |
207642%
|
207,642
|
$23,841,455 | — | 31 Mar 2026 | |
| SOROS FUND MANAGEMENT LLC |
13F
|
Company |
200000%
|
200,000
|
$22,964,000 | — | 31 Mar 2026 | |
| GABELLI FUNDS LLC |
13F
|
Company |
195900%
|
195,900
|
$22,493,238 | — | 31 Mar 2026 | |
| UBS Group AG |
13F
|
Company |
194709%
|
194,709
|
$22,356,487 | — | 31 Mar 2026 | |
| Verition Fund Management LLC |
13F
|
Company |
187354%
|
187,354
|
$21,511,986 | — | 31 Mar 2026 | |
| WATER ISLAND CAPITAL LLC |
13F
|
Company |
183409%
|
183,409
|
$21,059,022 | — | 31 Mar 2026 | |
| Man Group plc |
13F
|
Company |
180000%
|
180,000
|
$20,667,600 | — | 31 Mar 2026 | |
| Rock Springs Capital Management LP |
13F
|
Company |
169859%
|
169,859
|
$19,503,210 | — | 31 Mar 2026 | |
| GABELLI & Co INVESTMENT ADVISERS, INC. |
13F
|
Company |
152400%
|
152,400
|
$17,498,568 | — | 31 Mar 2026 | |
| BNP PARIBAS FINANCIAL MARKETS |
13F
|
Company |
151558%
|
151,558
|
$17,401,890 | — | 31 Mar 2026 | |
| Groupe la Francaise |
13F
|
Individual |
151046%
|
151,046
|
$17,343,102 | — | 31 Mar 2026 |
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.