F5, 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 710 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

• Shares outstanding is taken from the cover page of F5's most recent 10-Q (period ended 30 Jun 2026, filed 6 Aug 2026): 56,627,182 shares as of 3 Aug 2026. F5's fiscal year ends 30 September, and its most recent 10-K (fiscal year ended 30 Sep 2025) was filed 25 Nov 2025, well before this 10-Q; the 10-Q is unambiguously the newer document, so no fiscal-year-end trap applies here (unlike Coherent, Clorox and Tapestry in earlier chunks). F5 has an active buyback program (the FY2025 10-K describes a $1.0 billion authorization from Oct 2024), and shares issued and outstanding fell from 57,684 thousand at 30 Sep 2025 to 56,826 thousand at 30 Jun 2026 per the 10-Q's balance sheet, consistent with continued repurchases.
• Holdings side: searched F5's most recent 10-Q (period 30 Jun 2026) for 'equity method', 'equity investment', 'non-marketable', 'privately held', 'investment in', 'joint venture', 'unconsolidated', 'strategic investment', 'cost method'. Only 'equity investment' hit, in the fair-value-measurement note: a combined balance sheet line item 'Equity investments' of $21,991 thousand ($21.991 million) as of 30 Jun 2026, up from $15,693 thousand ($15.693 million) as of 30 Sep 2025 and $8,580 thousand as of 30 Sep 2024, described as 'investments without readily determinable fair values that are measured at fair value using net asset value (NAV) as a practical expedient, or are measured at cost with adjustments for observable changes in price or impairments.' No investee is named in the 10-Q or in the most recent 10-K, which carries the same note (confirmed by a matching search of the 10-K for the same terms plus 'equity securities'). Per this project's rule that a combined balance covering unnamed investees sizes none of them individually, no holdings row is created; the $21.991 million bucket is recorded here as a genuine but unsized negative.
• Exhibit 21.1 of the FY2025 10-K (subsidiaries list, as of 30 Sep 2025) was checked as the brief suggests: it is a bare name/jurisdiction list of F5's wholly owned operating subsidiaries only (including NGINX International Ltd. (Ireland) and Shape Security, Inc. (Delaware), both wholly owned acquired operating subsidiaries and correctly excluded per the brief), no ownership-percentage column, and no privately held minority-stake investee named anywhere on it. Volterra does not appear on the exhibit by that name, presumably folded into another F5 entity post-acquisition; not investigated further since Exhibit 21 carries no percentage column regardless. Treated as a genuine negative, consistent with the unnamed equity-investments bucket being the only holdings-adjacent disclosure found in any filing searched.
• EDGAR's Schedule 13D/13G filing history for F5 (CIK 0001048695) was checked in full back to 2014: every filing is a 13G or 13G/A (passive investor disclosures from Vanguard, BlackRock, State Street and Hotchkis & Wiley among others), the most recent dated 6 Dec 2024. There is no active Schedule 13D filer (no activist or strategic holder) on record for F5.
• The 2026 DEF 14A's 5-per-cent beneficial-ownership table (record date 6 Jan 2026) lists Vanguard, BlackRock, Hotchkis & Wiley and State Street, all sourced by the proxy to their most recent Schedule 13G/A on file (dated between Jan 2024 and Nov 2025), not to a fresh 13F. Unlike Allegion in an earlier chunk, there is no missing-Vanguard gap here: Vanguard IS present in the proxy's own table. However every one of the proxy's four figures is stale relative to the fresh Q2 2026 13F sweep performed here, and the correction does not run one way: Vanguard and Hotchkis & Wiley both come down materially (Hotchkis & Wiley by about 2.77 million shares, from 8.51% to 3.64%, the largest single revision), BlackRock comes up, and State Street is essentially unchanged. This project's register uses the fresh 13F figures throughout and keeps each stale proxy figure in that row's own method_note for reconciliation.
• Capital Group family swept in full: all 6 registrants that hold securities under this family (Capital World Investors CIK 0001422849, Capital International Sarl CIK 0001065349, Capital International Ltd /CA/ CIK 0001065350, Capital International, Inc./CA/ CIK 0000895213, Capital Research Global Investors CIK 0001422848, Capital International Investors CIK 0001562230) were each checked directly against their own Q2 2026 13F-HR information table (both by CUSIP 315616102 and by issuer name 'F5'), and every one holds NOTHING in F5 as of 30 Jun 2026. Two further Capital Group registrants, Capital Research & Management Co (CIK 0000017283) and Capital Group International, Inc. (CIK 0000949308), file Form 13F-NT for this quarter (no holdings), confirming the family reports entirely through the 6 registrants checked. Per this project's rule, a holder checked and found at zero is recorded as a note, not a null row.
• T. Rowe Price Investment Management, Inc. (CIK 0001897612), the separate registrant this project's brief specifically flags, was checked directly (both CUSIP and name lookups against its own Q2 2026 13F-HR) and holds NOTHING in F5 as of 30 Jun 2026; only T. Rowe Price Associates, Inc. (CIK 0000080255) holds a position, recorded above.
• Self-gate computed from this final file on disk: 11 register rows. Members: François Locoh-Donou (156,557 sh) rolls up into 'All current directors and executive officers as a group (18 people)', which is reduced by that amount for the total (274,763 minus 156,557 = 118,206 residual), per the chart's own arithmetic; no other row rolls into another. Total = 7,089,761 (Vanguard) + 6,278,577 (BlackRock) + 3,098,509 (State Street) + 2,118,749 (Jericho Capital) + 2,061,574 (Hotchkis & Wiley) + 1,779,100 (Geode) + 1,540,207 (First Trust) + 1,385,078 (Invesco) + 230,516 (T. Rowe Price) + 156,557 (François Locoh-Donou, full value as a member) + 118,206 (officers/directors aggregate residual) = 25,856,834 shares, against shares_outstanding 56,627,182 = 45.66% of the company.
• That 45.66% sits just above the roughly 25-45% band this project's brief expects, and the cause was checked rather than shipped blind. Every institutional row's implied price (value_usd divided by shares, or for T. Rowe Price the thousands-corrected value) clusters tightly around $416.0 per share as of 30 Jun 2026 across all 9 institutional filers (Vanguard family, BlackRock, State Street, Jericho Capital, Hotchkis & Wiley, Geode, First Trust, Invesco, T. Rowe Price), confirming one consistent instrument, basis and price with no unit-mixing error. No family is double counted: Capital Group's six registrants and T. Rowe Price Investment Management were confirmed at zero and excluded rather than added. The elevated total instead reflects F5's relatively small and heavily buyback-shrunk float (56.6 million shares outstanding against a roughly $21.7 billion market cap) concentrated among unusually large index and active positions: Vanguard and BlackRock alone are 23.6% of the company, and five further active managers (Jericho Capital, Hotchkis & Wiley, Geode, First Trust, Invesco) each individually clear 2.4%, together adding a further 15.7%.
• Market cap is a computed figure: the Nasdaq closing price on 19 Aug 2026 ($382.63, per the same quote endpoint's secondaryData field, 'Closed at Aug 19, 2026 4:00 PM ET') multiplied by the 3 Aug 2026 10-Q cover-page share count (56,627,182). The two dates are about two weeks apart because no single source carries both a current price and a current share count; disclosed rather than treated as precise.