ALAB in the 13F filings

Astera Labs Inc · CUSIP 04626A103

Sector · Semiconductors Theme · AI infrastructure and semiconductors· L3VLUP-defined Theme · Semiconductors

Quarter

Q3 2026 · early filers Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024

Quarter end: 30 Sep 2025; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 29 Oct 2025
Managers listing it: 21; at least, of 95 tracked, among listed positions
Comparable managers: 95; filed both Q2 2025 and Q3 2025; 13 listed it in both
Shares listed: 38,269,557; combined, among listed positions
Reported value: $7.5bn; combined, at the quarter end

Among the 95 comparable managers: 13 buyers (opened or added shares) and 10 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing ALAB in Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

21 of 21 holders

				Action		Filing
Fidelity (FMR LLC)	24,079,486	$4.7bn	0.25%	Trimmed	-724,560	13 Nov 2025 (the filing on sec.gov)
AllianceBernstein LP	2,918,685	$571m	0.18%	Trimmed	-3,472,895	14 Nov 2025 (the filing on sec.gov)
D. E. Shaw & Co.	2,547,136	$499m	0.28%	Added	+516,739	14 Nov 2025 (the filing on sec.gov)
MFS Investment Management	1,507,675	$295m	0.09%	Added	+479,360	29 Oct 2025 (the filing on sec.gov)
Two Sigma Investments LP	1,263,510	$247m	0.37%	Added	+464,224	14 Nov 2025 (the filing on sec.gov)
Two Sigma Advisers LP	1,095,600	$215m	0.43%	Added	+518,000	14 Nov 2025 (the filing on sec.gov)
Maverick Capital Ltd	1,032,441	$202m	2.70%	Held	0	14 Nov 2025 (the filing on sec.gov)
Renaissance Technologies LLC	843,301	$165m	0.22%	Added	+93,801	13 Nov 2025 (the filing on sec.gov)
Voloridge Investment Management LLC	671,804	$132m	0.44%	New	new	14 Nov 2025 (the filing on sec.gov)
Capital World Investors	600,000	$117m	under 0.1%	Held	0	13 Nov 2025 (the filing on sec.gov)
Marshall Wace LLP	298,414	$58m	0.06%	Added	n.a.	13 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC	284,256	$56m	under 0.1%	Added	n.a.	27 Oct 2026 (the filing on sec.gov)
Acadian Asset Management LLC	233,715	$46m	0.08%	Added	n.a.	13 Nov 2025 (the filing on sec.gov)
Baillie Gifford & Co	230,787	$45m	under 0.1%	Trimmed	-2,440	31 Oct 2025 (the filing on sec.gov)
Brevan Howard Capital Management LP	186,984	$37m	0.16%	Added	+112,518	14 Nov 2025 (the filing on sec.gov)
Holocene Advisors LP	164,964	$32m	0.07%	Trimmed	-452,450	14 Nov 2025 (the filing on sec.gov)
Man Group PLC	113,158	$22m	under 0.1%	Added	n.a.	14 Nov 2025 (the filing on sec.gov)
Walleye Capital LLC	101,205	$20m	0.07%	Added	n.a.	14 Nov 2025 (the filing on sec.gov)
Verition Fund Management LLC	69,951	$14m	0.06%	Added	n.a.	14 Nov 2025 (the filing on sec.gov)
Quantbot Technologies LP	16,226	$3.2m	0.09%	Trimmed	n.a.	12 Nov 2025 (the filing on sec.gov)
PDT Partners LLC	10,259	$2.0m	0.13%	Trimmed	-114,383	17 Nov 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2025 to Q3 2025, among managers that listed it in both quarters or opened it.

Increases

Voloridge Investment Management LLCnew position · 671,804 shares now+671,804
Two Sigma Advisers LPexisting position · 1,095,600 shares now+518,000
D. E. Shaw & Co.existing position · 2,547,136 shares now+516,739
MFS Investment Managementexisting position · 1,507,675 shares now+479,360
Two Sigma Investments LPexisting position · 1,263,510 shares now+464,224

Reductions

AllianceBernstein LPexisting position · 2,918,685 shares now-3,472,895
Fidelity (FMR LLC)existing position · 24,079,486 shares now-724,560
Holocene Advisors LPexisting position · 164,964 shares now-452,450
PDT Partners LLCexisting position · 10,259 shares now-114,383
Baillie Gifford & Coexisting position · 230,787 shares now-2,440

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (1)

Voloridge Investment Management LLC$132m

Exited (4)

Artisan Partners LPwas $27m
Caxton Associates LLPwas $15m
Rokos Capital Management LLPwas $6.6m
Discovery Capital Management LLCwas $3.7m

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

11 in Q3 2024 to 24 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

ALAB by quarter
Quarter	Holders	Reported value	Buyers	Sellers
Q1 2024	15	$1.5bn	15	0
Q2 2024	8	$1.6bn	2	8
Q3 2024	11	$1.5bn	8	3
Q4 2024	19	$5.4bn	12	8
Q1 2025	15	$2.5bn	10	5
Q2 2025	23	$3.7bn	16	7
Q3 2025	21	$7.5bn	13	10
Q4 2025	19	$6.1bn	13	27
Q1 2026	13	$3.9bn	13	20
Q2 2026	24	$18.9bn	22	19

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ALAB and NVDA →ALAB and AVGO →ALAB and MU →Choose a stock to compare with ALAB →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ALAB, latest filings →Back to the 13F Explorer →

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