Ambiq Micro, Inc.
AMBQ- Exchange
- NYSE
- Industry
- Semiconductors & Related Devices
- SEC CIK
- 0001500412
In the last 90 days, Ambiq Micro, Inc. insiders filed 0 open-market purchases and 17 sales; 184 institutions reported holding it in 13F filings for Q2 2026, worth $1.48B in total; no superinvestor holds it.
Holders of 5% or more of AMBQ
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Ambiq Micro, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Kleiner Perkins Caufield & Byers XVI, LLC | 13G | 8.20%1.49M shares | New | Nov 3, 20251 filing | Nov 3, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 6.70%1.63M shares | +1.40 ppfrom 5.30% | Jul 27, 20262 filings | Oct 27, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
5 Schedule 13D and 13G filings on Ambiq Micro, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Oct 27, 20265:25 PM ET | BlackRock, Inc. | 13G/A | 6.70%1.63M shares | +1.40 ppfrom 5.30% | Sep 30, 2026 | SEC |
| Aug 14, 202610:39 AM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 4.30%1.01M shares | −1.70 ppfrom 6.00%Below 5% | Jun 30, 2026 | SEC |
| Jul 27, 20264:25 PM ET | BlackRock, Inc. | 13G | 5.30%1.26M shares | New | Jun 30, 2026 | SEC |
| May 15, 202610:06 AM ET | T. Rowe Price Investment Management, Inc. | 13G | 6.00%1.27M shares | New | Mar 31, 2026 | SEC |
| Nov 3, 20259:50 PM ET | Kleiner Perkins Caufield & Byers XVI, LLCand 5 others | 13G | 8.20%1.49M shares | New | Sep 30, 2025 | SEC |
Form 144: proposed insider sales
22 notices from officers, directors and other affiliates planning to sell Ambiq Micro, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Nov 12, 20264:31 PM ET | Fumihide (Humi) EsakaOfficer · Director | 50.0K | $2.49M | Nov 12, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Oct 5, 20264:45 PM ET | Sean ChenOfficer | 53.2K | $3.63M | Oct 5, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Oct 2, 20264:16 PM ET | Jeffrey G. WinzelerOfficer | 5.46K | $377.2K | Oct 2, 2026 | Morgan Stanley Smith Barney LLC | SEC |
| Oct 2, 20264:11 PM ET | Scott McLean HansonOfficer · Director | 8.68K | $600.2K | Oct 2, 2026 | Morgan Stanley Smith Barney LLC | SEC |
| Oct 2, 20264:07 PM ET | Fumihide EsakaOfficer · Director | 16.6K | $1.15M | Oct 2, 2026 | Morgan Stanley Smith Barney LLC | SEC |
| Oct 2, 20264:04 PM ET | Sean Chihhsiang ChenOfficer | 5.80K | $401.2K | Oct 2, 2026 | Morgan Stanley Smith Barney LLC | SEC |
| Sep 11, 20264:15 PM ET | Ker ZhangDirector | 10.0K | $634.4K | Sep 11, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 11, 20264:11 PM ET | Fumihide EsakaOfficer · Director | 50.0K | $3.17M | Sep 11, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 4, 20264:39 PM ET | Sean ChenOfficer | 30.0K | $1.69M | Sep 4, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 4, 20264:07 PM ET | Ker ZhangDirector | 185 | $10.5K | Sep 4, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 2, 20264:14 PM ET | Fumihide (Humi) EsakaOfficer · Director | 11.0K | $625.1K | Sep 2, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Sep 1, 20264:15 PM ET | Fumihide (Humi) EsakaOfficer · Director | 49.0K | $2.76M | Sep 1, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 31, 20264:37 PM ET | Fumihide (Humi) EsakaOfficer · Director | 35.0K | $2.01M | Aug 31, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 27, 20264:19 PM ET | Scott HansonOfficer | 27.5K | $1.64M | Aug 27, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 26, 20264:23 PM ET | Scott HansonOfficer | 27.5K | $1.64M | Aug 26, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 14, 20264:43 PM ET | Scott HansonDirector · Officer | 21.0K | $1.35M | Aug 14, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 14, 20264:40 PM ET | Fumihide EsakaDirector · Officer | 45.5K | $2.93M | Aug 14, 202610b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 27, 20263:14 PM ET | Triumph Way Investment IncDirector | 70.6K | $5.65M | May 27, 2026 | UBS Financial Services Inc | SEC |
| May 15, 20264:13 PM ET | Sean ChenOfficer | 55.7K | $3.95M | May 15, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 14, 20264:13 PM ET | Jeff G WinzelerOfficer | 26.0K | $1.82M | May 14, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 14, 20264:11 PM ET | Scott HansonOfficer | 10.2K | $706.3K | May 14, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| May 14, 20264:09 PM ET | Fumihide EsakaOfficer | 60.0K | $4.20M | May 14, 2026 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |