AMBQ in the 13F filings

Ambiq Micro Inc · CUSIP 023193105

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

Quarter

Q2 2026 Q1 2026 Q4 2025 Q3 2025

Quarter end: 30 Jun 2026; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 3 Aug 2026
Managers listing it: 27; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q1 2026 and Q2 2026; 2 listed it in both
Shares listed: 5,322,982; combined, among listed positions
Reported value: $432m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 23 buyers (opened or added shares) and 4 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +3,393,037.

Managers listing AMBQ in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, 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

27 of 27 holders

				Action		Filing
D. E. Shaw & Co.	983,916	$87m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP	651,786	$58m	under 0.1%	Added	+614,992	14 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC	315,455	$28m	0.10%	Trimmed	-341,097	14 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC	294,802	$26m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Millennium Management LLC	289,206	$26m	under 0.1%	Added	+111,650	14 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC	272,126	$24m	under 0.1%	New	new	27 Oct 2026 (the filing on sec.gov)
First Eagle Investment Management LLC	244,394	$22m	under 0.1%	Trimmed	-34,679	5 Aug 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	223,276	$20m	0.08%	New	new	14 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC	214,756	$19m	under 0.1%	Added	+172,156	13 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC	214,528	$19m	0.07%	Added	+203,099	3 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP	609,607	$15m	under 0.1%	Trimmed	-76,491	14 Aug 2026 (the filing on sec.gov)
Wellington Management Group LLP	168,139	$15m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	156,906	$14m	under 0.1%	Added	+141,970	14 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC	122,425	$11m	under 0.1%	New	new	2 Sep 2026 (the filing on sec.gov)
Marshall Wace LLP	109,488	$9.7m	under 0.1%	New	new	13 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC	78,902	$7.0m	under 0.1%	New	new	13 Aug 2026 (the filing on sec.gov)
Point72 Asset Management LP	77,165	$6.8m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Woodline Partners LP	64,484	$5.7m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC	63,228	$5.6m	under 0.1%	Added	+54,240	14 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp	49,508	$4.4m	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	44,634	$3.9m	under 0.1%	Added	+43,871	13 Aug 2026 (the filing on sec.gov)
Element Capital Management LLC	34,257	$3.0m	0.09%	New	new	14 Aug 2026 (the filing on sec.gov)
Quantbot Technologies LP	12,832	$1.1m	under 0.1%	Trimmed	-2,324	12 Aug 2026 (the filing on sec.gov)
Invesco Ltd	10,205	$901k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP	7,726	$682k	under 0.1%	New	new	14 Aug 2026 (the filing on sec.gov)

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Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

D. E. Shaw & Co.new position · 983,916 shares now+983,916
Two Sigma Investments LPexisting position · 651,786 shares now+614,992
Jane Street Group LLCnew position · 294,802 shares now+294,802
Neuberger Berman Group LLCnew position · 272,126 shares now+272,126
Voloridge Investment Management LLCnew position · 223,276 shares now+223,276

Reductions

Schonfeld Strategic Advisors LLCexisting position · 315,455 shares now-341,097
AllianceBernstein LPexisting position · 609,607 shares now-76,491
First Eagle Investment Management LLCexisting position · 244,394 shares now-34,679
Quantbot Technologies LPexisting position · 12,832 shares now-2,324

New positions and exits

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

New (16)

Exited (0)

No exit shown by a manager’s own filing.

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.

3 in Q3 2025 to 5 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.

Compare with…

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

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

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 AMBQ, latest filings →Back to the 13F Explorer →

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