RA CAPITAL MANAGEMENT, L.P.

Holdings History for Arcellx, Inc. - COMMON STOCK (ACLX)

Symbol: ACLX on Nasdaq
Investment type: Equity / COMMON STOCK
Latest Disclosed Shares Owned: 1,267,156 shares
Security Ownership %: 2.2%

Shares, Excluding Options vs Price

Value, Excluding Options

RA Capital Management, L.P. ownership in Arcellx, Inc. COMMON STOCK (ACLX)

17 Feb 2026 - RA Capital Management, L.P. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,267,156 shares of Arcellx, Inc. COMMON STOCK (ACLX). This represents 2.2% ownership of the company. This is the first filing by RA CAPITAL MANAGEMENT, L.P. disclosing ownership of Arcellx, Inc. COMMON STOCK (ACLX).

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filing time
RA Capital Management, L.P.	2.2%		$83,974,428	1,267,156			$66.27	13G/A	31 Dec 2025	17 Feb 2026, 16:19

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
31 Dec 2025	0.85%	-1.2%	$82,618,571	1,267,156	-1,769,371	-58%	$65.20	Q4 2025
30 Sep 2025	3.1%	0%	$249,298,867	3,036,527	0		$82.10	Q3 2025
30 Jun 2025	3.4%	0%	$199,955,303	3,036,527	0		$65.85	Q2 2025
31 Mar 2025	3.3%	+0.27%	$199,196,171	3,036,527	+249,200		$65.60	Q1 2025
31 Dec 2024	2.8%	+0.96%	$213,760,108	2,787,327	+935,848	+51%	$76.69	Q4 2024
30 Sep 2024	1.8%	+0.24%	$154,617,011	1,851,479	+247,465	+15%	$83.51	Q3 2024
30 Jun 2024	1.2%	+1.1%	$88,525,533	1,604,014	+1,604,014	NEW	$55.19	Q2 2024

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.