MACOM · ownership
Who owns MACOM?
FMR LLC is the largest 13F holder: 14.4% of 13F-reported shares calc.
657 institutions report 73.3M MACOM shares in Form 13F, as of quarter end Jun 30, 2026; −836K shares vs Mar 31, 2026.
- FMR LLC14.4%10.5M shares · −83K vs prior quarter (down) · 13F filed Aug 13, 2026
- BlackRock, Inc.13.0%9.5M shares · +947K vs prior quarter (up) · 13F filed Aug 7, 2026
- VANGUARD PORTFOLIO MANAGEMENT LLC4.9%3.6M shares · +18K vs prior quarter (up) · 13F filed Aug 13, 2026
- VANGUARD CAPITAL MANAGEMENT LLC4.2%3.1M shares · +72K vs prior quarter (up) · 13F filed Aug 13, 2026
- T. Rowe Price Investment Management, Inc.3.9%2.9M shares · −1.6M vs prior quarter (down) · 13F filed Aug 14, 2026
- STATE STREET CORP3.1%2.3M shares · +109K vs prior quarter (up) · 13F filed Aug 7, 2026
- Invesco Ltd.2.9%2.1M shares · −1.5M vs prior quarter (down) · 13F filed Aug 14, 2026
- JPMORGAN CHASE & CO2.9%2.1M shares · +109K vs prior quarter (up) · 13F filed Aug 12, 2026
- GEODE CAPITAL MANAGEMENT, LLC1.9%1.4M shares · +50K vs prior quarter (up) · 13F filed Aug 12, 2026
- WELLINGTON MANAGEMENT GROUP LLP1.6%1.2M shares · −342K vs prior quarter (down) · 13F filed Aug 14, 2026
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/1.6%1.2M shares · +338K vs prior quarter (up) · 13F filed Aug 3, 2026
- Capital Research Global Investors1.5%1.1M shares · −137K vs prior quarter (down) · 13F filed Aug 12, 2026
- NORGES BANK1.4%997K shares · +997K vs prior quarter (new position) · 13F filed Aug 12, 2026
- Whale Rock Capital Management LLC1.3%989K shares · −186K vs prior quarter (down) · 13F filed Aug 14, 2026
- PRICE T ROWE ASSOCIATES INC /MD/1.3%980K shares · +65K vs prior quarter (up) · 13F filed Aug 14, 2026
- NEUBERGER BERMAN GROUP LLC1.1%827K shares · +38K vs prior quarter (up) · 13F filed Aug 13, 2026
- GOLDMAN SACHS GROUP INC1.1%812K shares · +382K vs prior quarter (up) · 13F filed Aug 14, 2026
- FRANKLIN RESOURCES INC1.1%799K shares · +297K vs prior quarter (up) · 13F filed Aug 13, 2026
- Qube Research & Technologies Ltd1.1%791K shares · +791K vs prior quarter (new position) · 13F filed Aug 14, 2026
- Polar Capital Holdings Plc1.0%751K shares · −180K vs prior quarter (down) · 13F filed Aug 14, 2026
Share of 13F-reported shares, not of shares outstanding. 13F covers managers with over $100M in US equities; it is not a full shareholder list.
Method and sources
Source: SEC Form 13F data sets (bulk). Each row links to the holder’s own 13F-HR filing. Holder names exactly as filed; one group can file under several names and CIKs (for example two Vanguard entities), and they are listed separately, as filed.
% = the holder’s shares ÷ all shares reported in 13F filings for this company and quarter (calculated by Hollsteen). This is not a share of shares outstanding. Change = shares vs the same filer’s 13F for the prior quarter (Mar 31, 2026).
Erroneous filings and rows are handled by a fixed rule set (restatements replace originals; non-equity rows and implausible rows excluded): 7 erroneous filings excluded or replaced this quarter. No market values are shown.
SEC filings only. No price or market data.
Who holds more than 5%?
3 current Schedule 13D/13G holders
Schedule 13D/13G filings (13) ›
- FMR LLC 14.1%
13G/A filed May 6, 2026 · event date Mar 31, 2026 · 9 earlier filings
- BlackRock, Inc. 10.4%
13G/A filed Jul 8, 2026 · event date Jun 30, 2026 · 9 earlier filings
- OCAMPO SUSAN 6.4%
13G/A filed Aug 12, 2026 · event date Jun 30, 2026 · 8 earlier filings
- T. Rowe Price Investment Management, Inc. 3.7%
below 5% latest filing reports under 5% · 13G/A filed Aug 14, 2026 · event date Jun 30, 2026 · 2 earlier filings
- VANGUARD GROUP INC 0%
below 5% latest filing reports under 5% · 13G/A filed Mar 27, 2026 · event date Mar 13, 2026 · 8 earlier filings
- PRICE T ROWE ASSOCIATES INC /MD/ 4.3%
below 5% latest filing reports under 5% · 13G/A filed May 14, 2025 · event date Mar 31, 2025 · 4 earlier filings
- Invesco Ltd. 4.9%
stale filed Feb 7, 2025, as of Dec 31, 2024: older than 18 months, not a current holding · 13G/A filed Feb 7, 2025 · 1 earlier filing
- ALLIANCEBERNSTEIN L.P. 4.5%
stale filed Feb 14, 2023, as of Dec 31, 2022: older than 18 months, not a current holding · 13G/A filed Feb 14, 2023 · 1 earlier filing
- OCAMPO JOHN L 23.1%
stale filed Jan 12, 2023, as of Dec 31, 2022: older than 18 months, not a current holding · 13G/A filed Jan 12, 2023 · 5 earlier filings
- Capital Research Global Investors 2.6%
stale filed Feb 16, 2021, as of Dec 31, 2020: older than 18 months, not a current holding · 13G/A filed Feb 16, 2021 · 3 earlier filings
- LMCG INVESTMENTS, LLC 3.62%
stale filed Feb 7, 2020, as of Dec 31, 2019: older than 18 months, not a current holding · 13G/A filed Feb 7, 2020 · 1 earlier filing
- AMERIPRISE FINANCIAL INC 3.9%
stale filed Feb 14, 2019, as of Dec 31, 2018: older than 18 months, not a current holding · 13G/A filed Feb 14, 2019 · 2 earlier filings
- WELLINGTON MANAGEMENT GROUP LLP 1.98%
stale filed Feb 8, 2018, as of Dec 29, 2017: older than 18 months, not a current holding · 13G/A filed Feb 8, 2018
Method and sources
Schedule 13D (active) and 13G (passive) are filed by holders of more than 5% of a class. The percentage is the holder’s own cover-page “percent of class”. A filing older than 18 months (filed before 2025-04-17) is marked stale and is never shown as a current holding. Data as of Oct 15, 2026.
SEC filings only.
Are insiders buying or selling?
0 open-market purchases, 188 sales in 12 months
Form 4, Oct 15, 2025 – Oct 15, 2026 · 0 shares bought, 1,965,307 shares sold (net −2.0M) · as of Oct 15, 2026
Latest 25 of 436 Form 4 transactions ›
| Date | Insider (as filed) | Transaction | Shares | Held after |
|---|---|---|---|---|
| Oct 1, 2026 | Roth Ambra R. · SVP, GC and Secretary | Open-market sale · 10b5-1 | 653 disposed | 9,184 |
| Aug 28, 2026 | Dennehy Robert · Senior VP and COO | Open-market sale · 10b5-1 | 252 disposed | 12,758 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 1,590 disposed | 39,382 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 400 disposed | 38,982 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 900 disposed | 38,082 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 500 disposed | 37,582 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 1,699 disposed | 35,883 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 1,600 disposed | 34,283 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 300 disposed | 33,983 |
| Aug 17, 2026 | Kober John · Senior VP and CFO | Open-market sale · 10b5-1 | 400 disposed | 33,583 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 100 disposed | 32,276 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 100 disposed | 32,176 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 200 disposed | 31,976 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 100 disposed | 31,876 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 420 disposed | 31,456 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 300 disposed | 31,156 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 9 disposed | 31,147 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 400 disposed | 30,747 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 200 disposed | 30,547 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 400 disposed | 30,147 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 291 disposed | 29,856 |
| Jun 25, 2026 | Hwang Donghyun Thomas · SVP, Global Sales | Open-market sale · 10b5-1 | 100 disposed | 29,756 |
| May 29, 2026 | Daly Stephen G · Director; President and CEO | Open-market sale · 10b5-1 | 1,500 disposed | 52,717 |
| May 29, 2026 | Daly Stephen G · Director; President and CEO | Open-market sale · 10b5-1 | 2,200 disposed | 50,517 |
| May 29, 2026 | Daly Stephen G · Director; President and CEO | Open-market sale · 10b5-1 | 400 disposed | 50,117 |
Method and sources
Form 4 filings (not 4/A), table I. Open market = transaction codes P (purchase) and S (sale); grants, option exercises, tax withholding and gifts are listed but not counted as buys or sells. Shares and share counts only, as filed; Hollsteen shows no per-share prices. Data is an export, as of Oct 15, 2026, not live.
SEC filings only.