Super Micro Computer, Inc. (Supermicro)

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 693 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

• STOCK SPLIT: Supermicro effected a 10-for-1 forward stock split of its common stock, established from the company's own 8-K filings (not from memory). The split was announced 26 Sep 2024 (8-K, accession 0001375365-24-000034), became effective at 5:00pm Eastern on 30 Sep 2024 via a Delaware certificate-of-amendment (confirmed by the follow-up 8-K filed 30 Sep 2024, accession 0001375365-24-000035: 'every one (1) share of Common Stock issued and outstanding was automatically divided into ten (10) shares'), with the new CUSIP 86800U302 trading split-adjusted from 1 Oct 2024. Every filing used in this file (the Q3 FY2026 10-Q, cover date 30 Apr 2026, and the 2026 DEF 14A, record/measurement date 31 Jan 2026) postdates the split, so no pre-split figure needed restating; this was verified rather than assumed, and is flagged here because it is this company's specific known risk per the research brief.
• LATEST FILING BY DATE: Supermicro's fiscal year ends 30 Jun. As of today (19 Aug 2026) no FY2026 10-K (period 30 Jun 2026) has been filed; the most recent 10-K on record is for FY2025 (period 30 Jun 2025, filed 28 Aug 2025). The single newest periodic filing on EDGAR is instead the Q3 FY2026 10-Q (period 31 Mar 2026, filed 11 May 2026), whose cover page states 601,418,482 shares outstanding as of 30 Apr 2026: this is the basis used for company.shares_outstanding. An 8-K dated 11 Aug 2026 announced 'Fourth Quarter and Full Fiscal Year 2026 Financial Results' via press release but carries no updated cover-page share count of its own, so it was not used as the shares_outstanding source. The FY2026 10-K, once filed, will very likely be newer than this 10-Q; this file could not wait for it and used the freshest cover page actually available.
• SHARES OUTSTANDING DRIFT: an aggregator (stockanalysis.com, checked 19 Aug 2026) shows 646.87 million shares outstanding, about 45.5 million more than the SEC cover-page figure used here (601,418,482 as of 30 Apr 2026). This is plausible dilution over roughly 3.5 months (Supermicro has active convertible notes and has issued equity), not used as the primary figure because it is an aggregator rather than a filed cover page, and flagged here as a reconciliation note rather than silently overwritten.
• FOUNDER STAKE ARITHMETIC: the 'Charles Liang & Sara Liu' row (82,084,339 shares, 13.4% as printed in the 2026 DEF 14A) does not fully reconcile against its own footnote: the footnote itemizes only 40,426,120 (Liang, direct) + 607,399 (Liu, direct) + 25,672,520 (held jointly) = 66,706,039 shares, a 15,378,300-share gap versus the table's printed total that the footnote text does not explain (no additional trust or entity is named in it). The printed table total was used as the authoritative figure (it independently reproduces the proxy's own stated 13.4% against the proxy's enlarged, holder-specific denominator, and it makes the 'all directors and officers' group total reconcile to within 233,738 shares of the sum of its 12 individually named members, whereas the smaller footnote total would not). This is reported as found, not resolved by assumption.
• NO DOUBLE-CONTAINER PROBLEM: unlike Carvana or Marriott in this database, neither Charles Liang, Sara Liu, nor Wally Liaw's stake sits inside two separate register containers here. Sara Liu is folded into the single combined 'Charles Liang & Sara Liu' row (not listed separately, unlike in the FY2025 proxy where she had her own duplicate-figure row), and both that row and the Liaw row roll up into exactly one container, 'All directors and executive officers as a group (12 individuals),' so the standard is_aggregate/rolls_up_into subtraction mechanism was sufficient with no manual double-reduction needed.
• ABLECOM AND COMPUWARE: both are purely commercial related-party relationships, not equity holdings of Supermicro. Ablecom (majority-owned by Steve Liang, Charles Liang's brother, ~35% per the Q3 FY2026 10-Q; Charles Liang and Sara Liu personally, not Supermicro, own ~10.5% of Ablecom) manufactures approximately 94-95% of the chassis Supermicro purchases, under product-development, production, manufacturing-services, credit and warehouse-lease agreements (non-cancelable purchase orders to Ablecom were $49.3 million as of 31 Mar 2026). Compuware (whose CEO/Chairman is Bill Liang, another Charles Liang brother, and in which Steve Liang and a sibling of Wally Liaw also hold personal equity) is a non-exclusive authorized distributor of Supermicro's products in Taiwan, China, Australia, Malaysia and the US, and also sells components to Supermicro, under a $200 million trade credit line extended 19 Nov 2025. Supermicro itself holds no equity interest in either company; both were searched specifically for this file per the brief's instruction and found to be commercial-only.
• DIVESTED HOLDING NOT CARRIED: Supermicro held a 30%-owned 'Corporate Venture' in China (equity-method investment, entered October 2016) that it fully divested. Its carrying value was already fully impaired to $0 as of 30 Jun 2025 for other reasons; the divestiture itself (Equity Transfer Agreement signed 25 Nov 2025) closed 23 Dec 2025, after which it ceased to be a related party. No holdings row is recorded for it because it is not a current holding as of the newest filing (Q3 FY2026 10-Q, 31 Mar 2026).
• HOLDINGS SIDE SEARCH: the Q3 FY2026 10-Q was searched for 'equity method' (4 hits: the non-marketable equity securities roll-forward table and the divested China Corporate Venture, both covered above), 'equity investment' (2 hits: same two items), 'non-marketable' (6 hits: same items), 'privately held' (3 hits: same items), 'joint venture' (0 hits) and 'unconsolidated' (0 hits). Exhibit 21.1 of the FY2025 10-K (as of 30 Jun 2025) was also checked: it is a bare 17-name list of wholly owned Super-Micro-branded international subsidiaries with no ownership-percentage column and no joint ventures, a genuine negative per the brief's own caveat that this exhibit's format varies by registrant.
• CAPITAL GROUP FAMILY, CHECKED AND FOUND AT ZERO: all 11 Capital Group-affiliated 13F registrants were enumerated by EDGAR company search on the family's known name fragments ('capital group', 'capital international', 'capital research'): Capital World Investors (CIK 0001422849), Capital Research Global Investors (0001422848), Capital International Investors (0001562230), Capital International, Inc./CA/ (0000895213), Capital Group Investment Management Pte. Ltd. (0001939970), Capital Group Private Client Services, Inc. (0001857666), Capital International Ltd /CA/ (0001065350), Capital International Sarl (0001065349) all filed Q2 2026 13F-HR (period 30 Jun 2026, filed 12 Aug 2026) with holdings, and none contains a CUSIP 86800U302 (or 86800U500) line for Supermicro; Capital Group Companies, Inc. (0000732812), Capital Group International, Inc. (0000949308) and Capital Research & Management Co (0000017283) each filed Form 13F-NT (no holdings) for the same quarter. The 31 Mar 2026 register snapshot (data/registers/SMCI.json) also carries no Capital Group entity at all, consistent with a genuine zero rather than an omission. No register row is created for this family per the brief's rule that a checked-and-zero holder is a note, not a null row.
• REGISTER SELF-GATE, computed from this final file exactly as the chart computes it (members at full value, the one aggregate reduced only by the two members that roll into it, everything else at full value): 11 register rows. Members rolling into 'All directors and executive officers as a group (12 individuals)': Charles Liang & Sara Liu (82,084,339) + Yih-Shyan (Wally) Liaw (15,546,165) = 97,630,504; aggregate's own stored value 99,092,937, reduced to a residual of 1,462,433. Summing every row at the chart's own arithmetic: Vanguard family 74,956,357 + Charles Liang & Sara Liu 82,084,339 + BlackRock 47,686,321 + officers/directors residual 1,462,433 + State Street 24,635,554 + UBS Group AG 19,689,932 + Yih-Shyan (Wally) Liaw 15,546,165 + Geode 15,510,079 + Invesco 11,716,747 + FMR 2,756,523 + T. Rowe Price Associates 772,174 = 296,816,624 shares, which is 49.36% of shares_outstanding (601,418,482). This sits below the brief's 55% flag threshold but above the 'typical' 25-45% band the brief describes, consistent with a founder-heavy register (the two co-founders, Liang/Liu and Liaw, alone are 16.23% combined) sitting on top of unusually concentrated institutional ownership (Vanguard plus BlackRock alone are 20.39% combined). Checked against the three known causes of an inflated register: (1) NOT a mixed instrument: every institutional row is the same CUSIP 86800U302 common stock, cross-checked at a tightly consistent implied price of $29.22 to $29.34 per share across all 8 independent institutional filers/families, including the T. Rowe Price thousands-conversion check, which lands in the same band; every depositary-share (CUSIP 86800U500) and convertible-note-derivative line encountered was explicitly excluded, never summed in. (2) NOT a mixed basis: every row postdates the 10-for-1 split (effective 30 Sep 2024) and every pct_of_company is computed against the single 601,418,482-share cover-page basis. (3) NOT a double count: the Vanguard family sum is justified by the parent's 13F-NT filing (the standard PNC-style case for summing successors); the Capital Group family was checked in full and found to hold zero; the one real proxy overlap (Liang&Liu and Liaw inside the officers/directors group) was found and correctly reduced via is_aggregate/rolls_up_into, not left to inflate the total or double-reduced.