Marvell Technology, Inc.

The full register, from 13F filings

The Register tab above is hand research: a dozen holders, each traced to the filing it came from. This asks the same question of the whole market for the quarter ended 31-mar-2026, where 1,517 managers reported a position. Broad where the research is deep, and shallow in the ways a 13F always is.

Built from 13F filings, which report US listed, long, US custodied positions only. A register from this source is a floor rather than a level: a holder's true position can be far larger, as BlackRock's ASML stake shows at 1.28m shares in a 13F against 26.3m in its 13G/A. Holdings held through derivatives, outside US custody, or below a manager's reporting obligation do not appear. Where a holder is marked as a family, its total sums several separate filing entities and describes something no single filing describes; the constituent entities and their share counts are listed so the total can be checked. That roll-up can legitimately exceed the family's own Schedule 13G, because a 13G is filed by one legal entity: Vanguard reports Alphabet through ten advisory entities, and The Vanguard Group Inc itself reported zero after its January 2026 disaggregation.

What a reader needs to know to read these numbers

• Amazon cross-edge verified. Re-parsed Amazon's Q2 2026 Form 13F-HR information table (source: https://www.sec.gov/Archives/edgar/data/1018724/000110465926092052/infotable.xml) directly against the MRVL CUSIP 573874104 using scripts/filing.py 13f. Result: 396,352 shares, $118,069,297, an exact match to the pre-existing amazon.json record. No disagreement to reconcile.
• Vanguard case: successor sum, not single parent. Vanguard Group Inc (CIK 0000102909) filed Form 13F-NT for the quarter ended 30 June 2026 (its EDGAR filing index for that accession contains only primary_doc.xml, no infoTable). Its position is represented by the sum of Vanguard Capital Management LLC (CIK 0002100119, 57,898,902 shares) and Vanguard Portfolio Management LLC (CIK 0002100121, 21,015,501 shares), 78,914,403 shares total. Other smaller Vanguard-affiliated 13F filers (e.g. Vanguard Advisers Inc, Vanguard Fiduciary Trust Co) were not individually checked within the time budget; see unknowns.
• Capital Group is three independently filing entities, not a Vanguard-style successor structure. All three were checked by name fragment ('MARV', 'MARVELL') and by CUSIP (573874104) against their full Q2 2026 information tables. Only Capital Research Global Investors (CIK 0001422848) holds MRVL, 3,085,747 shares. Capital World Investors (CIK 0001422849, 637 rows checked) and Capital International Investors (CIK 0001562230, 446 rows checked) hold none. The Capital Group row here sums only the one entity that actually holds, per the brief's instruction to name entities and CIKs and not assume all three hold.
• Thousands-convention correction: T. Rowe Price Group's Q2 2026 13F information table reports a raw <value> field of 4,120,739 for its 13,833,088 MRVL shares, which taken literally implies $0.298/share, about 1000x below every other holder's implied price. Every other register row (18 of 19 institutional/strategic rows) implies a price between $296.75 and $297.94, consistent with Amazon's independently verified $297.89. T. Rowe Price's value_usd in this file is the raw filed figure multiplied by 1,000 (4,120,739,000), which brings its implied price to $297.90 and into the cluster. This is the same thousands defect flagged in this project's pnc.json for a different filer.
• JPMorgan's implied price ($277.74) sits noticeably below the ~$297.89 cluster formed by every other holder, but this is not a units error (it is not off by a factor of 1,000 or 100): the raw filed shares (13,891,628, after excluding a 536,400-share option position under a separate derivative CUSIP) and raw filed value ($3,858,400,204) are used as reported. Likely explanation is that JPMorgan aggregates many managed accounts across the quarter with some valued on a date other than 30 June 2026, which the 13F form permits.
• Holdings are empty. Marvell's most recent 10-Q (period 2 May 2026, filed 28 May 2026) and FY2026 10-K (period 31 January 2026, filed 11 March 2026) were both searched for 'equity method', 'strategic investment', 'non-marketable equity securities', 'unconsolidated', 'joint venture', 'investment in', and 'equity securities'. Both filings disclose only a combined 'non-marketable equity investments' balance inside other non-current assets: $140.1 million at 2 May 2026, $129.6 million at 31 January 2026, $48.2 million at 1 February 2025, described as equity investments in privately-held companies with no individual investee named or sized. The 10-K's accounting-policy note on 'Investments in Equity Securities' confirms Marvell can use either the equity method or the measurement-alternative method depending on influence, but again names no current investee. Per the brief's rule that a combined balance sizes none of its investees individually, no holding row is recorded; this combined balance is the sourced finding for the empty holdings array rather than an unsupported blank.
• Marvell also has 2.0 million shares of Series A Convertible Preferred Stock issued and outstanding as of 2 May 2026 (none outstanding as of 31 January 2026), disclosed on the 10-Q balance sheet. This is a capital-structure fact about Marvell's own equity, not a holding Marvell owns in another company, so it is not in the holdings array. shares_outstanding (874,800,000) is the common stock cover-page figure only; the preferred shares are excluded, consistent with how every register percentage here (based on common shares) and the 13F filers themselves (which report common CUSIP 573874104 only) treat the capital structure.
• Register reconciliation on the three largest holders. Marvell's own 2026 proxy statement (based on Schedule 13G/A review, share count as of 31 January 2026, 847,287,680 shares) reports FMR LLC at 126,698,928 shares (14.95%), The Vanguard Group at 79,610,185 shares (9.40%), and BlackRock, Inc. at 60,534,116 shares (7.14%). The register instead uses each manager's Q2 2026 Form 13F-HR (30 June 2026 position dates): FMR at 56,933,063 shares, Vanguard's successor sum at 78,914,403 shares, and BlackRock at 85,641,174 shares. FMR's 13F figure is materially lower than its 13G-based proxy figure (a difference of about 70 million shares), while BlackRock's 13F figure is materially higher than its proxy figure (a difference of about 25 million shares); Vanguard's two figures are close. These gaps are larger than typical position drift between a February 13G/A cover date and a June 13F reporting date, and are recorded here rather than resolved, since both figures come from the filers' own SEC filings at different dates under different reporting regimes (13G beneficial ownership vs 13F institutional investment manager holdings, which can diverge for a single filer with both passive and active mandates).
• Percentages are computed by this research against 874,800,000 common shares outstanding as of 21 May 2026 (Q1 FY2027 10-Q cover page), except the two proxy-sourced insider rows, which the proxy itself states only as 'less than 1%' of its own 847,287,680-share denominator without giving an exact percentage; those two rows carry pct_of_company: null rather than an invented figure.
• Marvell's fiscal year ends in late January/early February, so the 'most recent 10-Q' as of 17 August 2026 covers the quarter ended 2 May 2026 (Marvell's fiscal Q1 2027), filed 28 May 2026. Marvell's Q2 FY2027 10-Q (period around 1 August 2026) had not yet been filed as of 17 August 2026, based on the EDGAR submissions feed for CIK 0001835632 and Marvell's own filing pattern in the two prior years (10-Qs for the August-ending quarter filed 29-30 August).
• Self-gate check: summing the 17 non-aggregate, non-insider register rows (Amazon, Vanguard, BlackRock, FMR, State Street, Geode, Norges Bank, JPMorgan, T. Rowe Price, Bank of America, Morgan Stanley, Northern Trust, Franklin, Schwab IM, Capital Group, Wells Fargo, Wellington, MFS -- 18 rows total counting Amazon) gives 370,438,929 shares against 874,800,000 shares outstanding, or 42.35%, within the expected 25 to 45 percent range.