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AMBQ · Ambiq Micro, Inc. · Holdings

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$50.98 +1.36 (+2.74%) At close · Oct 20
Russell 2000 member Rebalance outlook locked
Market Cap
$1.22B
Shares
24.18M
Volume · Oct 20 321.11K Avg daily vol (3M) 506.8K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of AMBQ: 13F, 13D and 13G, insiders and funds →
Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 188
Total Value: $1,540,959,091
Total Shares: 17,484,181
Showing 1–100 of 194 holdings by value · page 1 of 2

Institutional Ownership Trend

5 quarters

Holder Concentration

Across 185 13F filers
Top Holder
7.9%
Sep 2025 → Jun 2026 · range 7.9% – 15.2%
of institutional value
Top 5
29.3%
Sep 2025 → Jun 2026 · range 29.3% – 46.9%
of institutional value
Top 10
45.4%
Sep 2025 → Jun 2026 · range 45.4% – 68.9%
of institutional value
HHI
288
Sep 2025 → Jun 2026 · range 288 – 633
Broadly held

Who Holds AMBQ

Last 5 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 184 filers, like-for-like change +56.9%; actively managed books +60.8%; index-like books +46.7%.

Holder type Share Filers Change
Registered adviser 50.3% 100 +33.6%
Exempt adviser 1.0% 4 new
Adviser 8.7% 8 -22.1%
Bank 9.4% 14 +122.9%
Insurer 0.0% 1 new
Broker-dealer 0.0% 2 new
Benefit plan 0.1% 4 +441.6%
Non-US 3.4% 7 +1991.1%
Holding company 14.5% 7 +71.0%
Unknown 12.6% 37 +510.8%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 1 holder with no observed 2026-06-30 13F.

Conviction and Crowding

184 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
1
0.543% of filers hold it in their top 10
Mar 31, 2026: 0
Holders above 5%
0
median weight 0.004%
Mar 31, 2026: 0
Crowding
39.9%
of shares outstanding, 92nd percentile
Mar 31, 2026: 23.9%
Private-fund advisers
31.3%
of shares outstanding
Institutional ownership
80.7%
95.0% of the estimated free float
Top 10 holders
46.0%
of 13F shares, Herfindahl 0.029
Active holders
+60.8%
like-for-like share change of active filers
5% stakes on record
2
0 13D, 2 13G (1 institutional, 0 passive, 1 exempt)
How long holders have held it value-weighted 2.7 quarters
Under 1 year 53.8% 1 to 3 years 46.2% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net sellers of $3,863,710 (1 buying, 2 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$46.17
estimated per share
Mar 31, 2026: $31.70
Quarter-end price
$88.30
implied by 13F values
Estimated gain or loss
+91.3%
price against the estimated cost
Estimated at a loss
0.000%
of costed 13F value

Estimated cost covers 94.1% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies AMBQ's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 PTRN Pattern Group Inc. 5
2 TREE LendingTree, Inc. 3
3 FRVO Fervo Energy Co 6
4 ARLO Arlo Technologies, Inc. 5
5 RSI Rush Street Interactive, Inc. 5
6 HRI Herc Holdings Inc 5
7 PI Impinj Inc 5
8 PDFS Pdf Solutions Inc 5
9 CDNL Cardinal Infrastructure Group Inc. 4
10 LGN Legence Corp. 5

Shareholder Targets

13F filers that own its peers but not AMBQ, quarter ended Jun 30, 2026

Found through its holder-overlap peers: PTRN, TREE, FRVO, ARLO, RSI, HRI, PI, PDFS, CDNL, LGN, EVLV, LPTH, INIO, EVER, AIP, AGYS, BOBS, ARXS, LTH, BKV. 945 filers in all.

# Filer In peers
1 Advent International, L.P. Unknown, Concentrated $13,253,701,166 2 held
2 Blackstone Inc. Adviser, Concentrated $1,698,972,582 7 held
3 Bain Capital Investors LLC Unknown, Concentrated $1,508,765,280 1 held
4 DEVON ENERGY CORP/DE Unknown, Unknown $1,044,338,092 1 held
5 Capricorn Investment Group LLC Unknown, Concentrated $1,000,466,697 1 held
6 Jupiter Topco LLC Unknown, Diversified active $853,294,175 18 held
7 DIMENSIONAL FUND ADVISORS LP Registered adviser, Diversified active $770,486,425 11 held
8 Capital Research Global Investors Adviser, Diversified active $724,218,828 4 held
9 Capital International Investors Adviser, Diversified active $627,448,672 4 held
10 NORGES BANK Non-US, Index-like $578,205,938 9 held

Fund Ownership of AMBQ by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 10.90% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 1.99% 480,940
Index ETFs 8.91% 2,154,126
Active ETFs 0.17% 42,223
Active funds 11.75% 2,842,315
Unclassified 0.09% 22,905
All registered funds 22.92% 5,542,509
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 103 Exempt adviser 5 Adviser 7 Bank 14 Insurer 1 Broker-dealer 3 Benefit plan 4 Non-US 7 Holding company 7 Unknown 37
Showing 100 of 194
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
BlackRock, Inc. $121,909,006 7.91% 1,380,623
T. Rowe Price Investment Management, Inc. $88,861,499 5.77% 1,006,359
D. E. Shaw & Co., Inc. $86,879,782 5.64% 983,916
Atreides Management, LP $77,449,960 5.03% 877,123
STATE STREET CORP $76,112,745 4.94% 861,979
VANGUARD CAPITAL MANAGEMENT LLC $67,861,993 4.40% 768,539
TWO SIGMA INVESTMENTS, LP $57,552,703 3.73% 651,786
ALLIANCEBERNSTEIN L.P. $53,828,298 3.49% 609,607
GOLDMAN SACHS GROUP INC $39,465,683 2.56% 446,950
GEODE CAPITAL MANAGEMENT, LLC $29,962,573 1.94% 339,327
NEEDHAM INVESTMENT MANAGEMENT LLC $28,582,710 1.85% 323,700
Schonfeld Strategic Advisors LLC $27,854,676 1.81% 315,455
SILVERCREST ASSET MANAGEMENT GROUP LLC $27,293,176 1.77% 309,096
JANE STREET GROUP, LLC $26,031,016 1.69% 294,802
MILLENNIUM MANAGEMENT LLC $25,536,889 1.66% 289,206
Driehaus Capital Management LLC $25,516,845 1.66% 288,979
NEUBERGER BERMAN GROUP LLC $24,028,725 1.56% 272,126
First Eagle Investment Management, LLC $21,579,990 1.40% 244,394
EMERALD ADVISERS, LLC $21,515,531 1.40% 243,664
HRT FINANCIAL LP $19,923,923 1.29% 225,639
FRANKLIN RESOURCES INC $19,758,272 1.28% 223,763
VOLORIDGE INVESTMENT MANAGEMENT, LLC $19,715,270 1.28% 223,276
COOPER CREEK PARTNERS MANAGEMENT LLC $19,426,000 1.26% 220,000
RENAISSANCE TECHNOLOGIES LLC $18,962,954 1.23% 214,756
Walleye Capital LLC $18,942,822 1.23% 214,528
BNP PARIBAS ARBITRAGE, SA $18,029,182 1.17% 204,181
BANK OF AMERICA CORP /DE/ $17,949,005 1.16% 203,273
JPMORGAN CHASE & CO $17,729,754 1.15% 200,790
MORGAN STANLEY $16,071,215 1.04% 182,007
VANGUARD PORTFOLIO MANAGEMENT LLC $15,001,287 0.97% 169,890
WELLINGTON MANAGEMENT GROUP LLP $14,846,673 0.96% 168,139
DEUTSCHE BANK AG\ $14,601,905 0.95% 165,367
GILDER GAGNON HOWE & CO LLC $14,094,710 0.91% 159,623
EMERALD MUTUAL FUND ADVISERS TRUST $14,051,267 0.91% 159,131
PRICE T ROWE ASSOCIATES INC /MD/ $13,854,799 0.90% 156,906
SOFTBANK GROUP CORP. $13,151,313 0.85% 148,939
Nuveen, LLC $12,270,609 0.80% 138,965
NORTHERN TRUST CORP $11,549,815 0.75% 130,802
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND $11,128,360 0.72% 126,029
CITADEL ADVISORS LLC $10,810,127 0.70% 122,425
Hood River Capital Management LLC $10,749,465 0.70% 121,738
S SQUARED TECHNOLOGY, LLC $10,664,255 0.69% 120,773
LORD, ABBETT & CO. LLC $10,457,545 0.68% 118,432
MARSHALL WACE, LLP $9,667,789 0.63% 109,488
BARCLAYS PLC $8,802,273 0.57% 99,686
WASATCH ADVISORS LP $8,700,877 0.56% 127,635
CHARLES SCHWAB INVESTMENT MANAGEMENT INC $8,693,046 0.56% 98,449
VANGUARD FIDUCIARY TRUST CO $7,340,114 0.48% 83,127
Moody Aldrich Partners LLC $7,187,001 0.47% 81,393
ACADIAN ASSET MANAGEMENT LLC $6,967,046 0.45% 78,902
Point72 Asset Management, L.P. $6,813,669 0.44% 77,165
SUSQUEHANNA INTERNATIONAL GROUP, LLP $6,790,270 0.44% 76,900
Voleon Capital Management LP $6,709,034 0.44% 75,980
Public Sector Pension Investment Board $6,640,160 0.43% 75,200
Ghisallo Capital Management LLC $6,622,500 0.43% 75,000
Trexquant Investment LP $6,498,880 0.42% 73,600
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC $5,889,345 0.38% 66,697
ALGERT GLOBAL LLC $5,828,506 0.38% 66,008
Woodline Partners LP $5,693,937 0.37% 64,484
Squarepoint Ops LLC $5,583,032 0.36% 63,228
Roubaix Capital, LLC $4,702,593 0.31% 53,257
Informed Momentum Co LLC $4,500,474 0.29% 50,968
LMR Partners LLP $4,415,000 0.29% 50,000
Burkehill Global Management, LP $4,415,000 0.29% 50,000
TUDOR INVESTMENT CORP ET AL $4,371,556 0.28% 49,508
Bank of New York Mellon Corp $4,296,589 0.28% 48,659
CITADEL ADVISORS LLC $4,176,590 0.27% 47,300
FMR LLC $3,941,182 0.26% 44,634
READYSTATE ASSET MANAGEMENT LP $3,349,219 0.22% 37,930
UBS Group AG $3,159,903 0.21% 35,786
LOS ANGELES CAPITAL MANAGEMENT LLC $3,125,820 0.20% 35,400
ELEMENT CAPITAL MANAGEMENT LLC $3,024,893 0.20% 34,257
G2 Investment Partners Management LLC $2,913,900 0.19% 33,000
SEI INVESTMENTS CO $2,773,591 0.18% 31,411
JACOBS LEVY EQUITY MANAGEMENT, INC $2,666,306 0.17% 30,196
TITAN GLOBAL CAPITAL MANAGEMENT USA LLC $2,609,618 0.17% 29,554
Numerai GP LLC $2,136,153 0.14% 24,192
AMERIPRISE FINANCIAL INC $2,103,394 0.14% 23,821
CITADEL ADVISORS LLC $2,066,220 0.13% 23,400
GSA CAPITAL PARTNERS LLP $2,021,981 0.13% 22,899
TD Asset Management Inc $2,009,531 0.13% 22,758
KORNITZER CAPITAL MANAGEMENT INC /KS $1,944,630 0.13% 22,023
RHUMBLINE ADVISERS $1,929,884 0.13% 21,856
HighTower Advisors, LLC $1,922,114 0.12% 21,768
OCCUDO QUANTITATIVE STRATEGIES LP $1,889,443 0.12% 21,398
CITIGROUP INC $1,854,387 0.12% 21,001
SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,854,300 0.12% 21,000
Toronado Partners, LLC $1,697,567 0.11% 19,225
Capital Asset Advisory Services LLC $1,671,342 0.11% 18,928
AXXCESS WEALTH MANAGEMENT, LLC $1,671,342 0.11% 18,928
GLENMEDE TRUST CO NA $1,618,450 0.11% 18,329
WELLS FARGO & COMPANY/MN $1,502,159 0.10% 17,012
XTX Topco Ltd $1,476,640 0.10% 16,723
Quadrature Capital Ltd $1,450,945 0.09% 16,432
JANE STREET GROUP, LLC $1,306,840 0.08% 14,800
Ilex Capital Partners (UK) LLP $1,193,374 0.08% 13,515
Lighthouse Investment Partners, LLC $1,133,242 0.07% 12,834
Quantbot Technologies LP $1,133,065 0.07% 12,832
Russell Investments Group, Ltd. $1,083,262 0.07% 12,268
STIFEL FINANCIAL CORP $1,069,489 0.07% 12,112

Showing the top 100 of 194 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 1500412 CUSIP 023193105 13F (30d) 13 filings 13 filers Visit website Investor relations