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Autoresearch: SpaceX post-IPO index inclusion cadence vs the 5/10/15-day claim

Post-listing check: SPCX listed June 12; Russell and Nasdaq-100 additions confirmed from primaries; S&P 500 June 8 rule did not pass; float ~4.9% with greenshoe. Day 10 and official S&P TMI/CRSP notices still open.

Source

Autoresearch: SpaceX post-IPO index inclusion cadence vs the 5/10/15-day claim

Generated by /autoresearch on 2026-08-26. Synthesized across 3 rounds from 10 successful fetches (plus 1 Grokipedia helper fetch). See Provenance. Treat as raw material — review before promoting into a project or thread. Context: vault/projects/stock-market Prompt: the open question on SpaceX’s 5/10/15-day post-IPO index-inclusion cadence (Baron / CNBC). Dated miss: last dedicated source 2026-06-04 (roadshow Day 1). Named catalysts: S&P rule June 8, IPO June 12, Russell/CRSP Day 5, Nasdaq-100 Day 15 (July 7). Pull which indices actually added SPCX, float pulled, whether the June 8 S&P rule passed. Do not also open spacex-ipo-post-listing-entry-timing.

Summary

SpaceX did list. The company’s own IR release says Class A shares began trading on the Nasdaq Global Select Market and Nasdaq Texas on June 12, 2026 under ticker SPCX, and the offering closed June 15 after a full greenshoe at 638,888,888 shares and about $85.7 billion gross (SpaceX IR, 2026-06-15). The 10-Q matches the share count and prices the deal at $135.00, with $85,675 million net after $575 million of commissions and costs (SpaceX Form 10-Q for the quarter ended 2026-06-30).

Two of Baron’s named waves have post-listing primary or issuer-adjacent confirmation. FTSE Russell published a June 12 notice that SPCX “will be added” to the Russell 1000, Russell Top 200, and Russell Small Cap Completeness after the close on June 26, 2026, folded into the reconstitution rather than a standalone Day-5 print (FTSE Russell notice, 2026-06-12). Nasdaq-100 addition on July 7, 2026 is confirmed by a July 7 Motley Fool recap of the add (official Nasdaq IR HTML 403’d this pass; GlobeNewswire reprint timed out) (Motley Fool, 2026-07-07). VettaFi SPACE is confirmed only through the UFO issuer: ProcureAM said UFO added SPCX at 6.17% as of June 16 after the VettaFi reconstitution (ProcureAM / Newsfile, 2026-06-17). VettaFi’s own May 15 rule change allowed immediate eligibility for >$500B pure-plays; that page is pre-listing, not an addition notice (VettaFi, 2026-05-14).

The proposed S&P 500 June 8 fast-track did not pass. S&P DJI’s June 4 consultation results left seasoning, GAAP viability, and the 0.10 IWF floor unchanged for the S&P 500 / 400 / 600. What did take effect June 8 was an alternative IWF test for the S&P Total Market, S&P Completion, and Dow Jones U.S. Total Stock Market indexes only (S&P DJI press, 2026-06-04). This pass found no press.spglobal.com announcement that TMI actually added SPCX.

Realized IPO float is slightly under the pre-IPO ~5% claim on the base deal, ~4.9% with the greenshoe. The 424B4 says new investors own 4.2% of Class A+B immediately after the base offering, or approximately 4.9% if the overallotment is exercised in full (SpaceX 424B4, 2026-06-12). Day 10 remains open. CRSP addition is trade-press only.

Findings

Listing and ticker (confirmed from issuer + 10-Q)

SpaceX’s June 15 IR release is first-party on the listing facts: 638,888,888 Class A shares, including 83,333,333 overallotment shares; issuance closed June 15, 2026; trading began June 12, 2026 on Nasdaq Global Select and Nasdaq Texas as SPCX; gross proceeds “approximately $85.7 billion” (SpaceX IR, 2026-06-15). The registration statement was declared effective June 11, 2026 (SpaceX IR, 2026-06-15).

The 10-Q restates the same economics in filing language: “In June 2026, the Company completed its initial public offering (‘IPO’), in which the Company issued and sold 638.9 million shares of its Class A common stock at a public offering price of $135.00 per share, including the full exercise of the underwriters’ over-allotment option, which resulted in net proceeds of $85,675 million after deducting the underwriting commissions and offering costs of $575 million” (SpaceX Form 10-Q). Cover-page outstanding shares as of July 28, 2026: 7,696,293,669 Class A and 5,485,486,276 Class B (SpaceX Form 10-Q). The 10-Q also records a May 2026 five-for-one forward split (SpaceX Form 10-Q).

Grokipedia’s SpaceX page, fetched as the encyclopedic anchor, is stale: it still describes SpaceX as privately held as of March 24, 2026 and only planning a prospectus (Grokipedia, SpaceX). Use it as a pre-S-1 primer only.

S&P June 8 rule: S&P 500 rejected; TMI IWF alternative implemented

This is the cleanest binary of the pass. On June 4, 2026, S&P Dow Jones Indices published consultation results (S&P DJI press, 2026-06-04):

  • S&P 500 / MidCap 400 / SmallCap 600 — no change. Seasoning stays 12 months. IWF minimum stays 0.10. GAAP net income from continuing operations must still be positive for the most recent quarter and the sum of the most recent four quarters. Quote: “exceptions to the financial viability, seasoning, and IWF requirements should not be granted solely based on market capitalization.”
  • S&P Total Market / Completion / Dow Jones U.S. TSM — IWF alternative adopted, effective prior to the market open on Monday, June 8, 2026. A stock may be added with either IWF ≥ 0.10 or float-adjusted market cap ≥ 10% of the total-company market cap of the 100th-largest name in that index. An IPO that meets the updated IWF rule is eligible for fast-track (five business days’ lead time after S&P announces eligibility).

So the June 8 date in the question is real, but it is not an S&P 500 implementation. The S&P 500 proposal failed on June 4. That contradicts the May/June wiki line that “implementation June 8 if approved” would open a December 2026 S&P 500 window. Under the rules S&P left in place, S&P 500 eligibility is still a 12-month seasoning + profitability + 0.10 IWF problem. Vanguard’s June 10 (pre-listing) note said VOO remains “approximately 12 months wait time (subject to profitability screen)” (Vanguard, 2026-06-10). A July 6 Motley Fool recap still has VOO / S&P 500 funds without SPCX “until June 2027 at the earliest” (Motley Fool, 2026-07-06).

S&P TMI actual add: not confirmed from an S&P primary this pass. A site:press.spglobal.com search for a SpaceX / SPCX TMI addition returned the June 4 methodology release and unrelated S&P 500/400/600 constituent notices (Honeywell Aerospace, etc.), not an SPCX TMI add. Leave TMI unconfirmed at the index-provider level.

Russell / CRSP Day 5: Russell added, but on the reconstitution date, not a standalone Day-5 print

Confirmed (FTSE Russell primary). The June 12 notice states SPCX IPO’d that day at 555,555,555 Class A shares and $135; it “will be added to the Russell US Indexes (Russell 1000, Russell Top 200, Russell Small Cap Completeness)” because it “satisfies Russell US fast entry criteria”; projected share total 527,777,000; style 90.4% growth / 9.6% value; ICB 15102015 (Telecommunications Services); effective June 26, 2026 (after the close) in conjunction with the Russell Reconstitution effective date (FTSE Russell notice, 2026-06-12).

That is not a Day-5 standalone add. June 12 → June 26 after the close is the reconstitution print. The fast-entry rule is cited; the calendar was the June reconstitution. A July 6 Motley Fool recap treats the add as done: IWB and VONE now hold SPCX at about 0.13% after “the annual Russell reconstitution” (Motley Fool, 2026-07-06). Do not upgrade the 0.13% figure beyond that recap.

CRSP: no official CRSP / Morningstar Indexes notice fetched. Motley Fool (July 6) says VTI holds SPCX “because its underlying index, the CRSP US Total Market Index, added the stock on June 18,” at “less than 0.2%” (Motley Fool, 2026-07-06). Vanguard’s June 10 article only forecast VTI inclusion “after close of the 5th trading day after IPO” and did not confirm a date (Vanguard, 2026-06-10). Morningstar’s later “How Index Funds Are Adapting” page returned a JavaScript/robot check (not fetched). Treat June 18 CRSP as trade-press, not an index-provider primary.

Nasdaq-100 Day 15: added July 7 (official HTML blocked; Fool recap fetched)

Nasdaq IR (ir.nasdaq.com/.../join-nasdaq-100) returned Access Denied this pass. The GlobeNewswire reprint timed out. What fetched is Motley Fool on July 7, 2026, 5:56 p.m. ET: “SpaceX was added to the Nasdaq-100 on July 7 after the index changed its rules to include the IPO”; initial weight “less than 1%”; QQQ AUM cited at $490.1 billion; expected passive buying “only $4.3 billion,” described as “just about 0.2% of the stock”; public float “less than 5% of shares outstanding” (Motley Fool, 2026-07-07).

That is weaker than an index-provider press release but is a dated, named recap of the add having occurred. It also cuts against the pre-IPO $7–12B Nasdaq-100 wave: Fool’s $4.3B is a different number from a different date. Do not flatten those. Search snippets of the June 26 Nasdaq/GlobeNewswire release exist (“will become a component … prior to market open on Tuesday, July 7, 2026”) but were not fetched — do not treat the snippet as a citation.

VettaFi SPACE: issuer (UFO) confirms a June 16 add; VettaFi’s own page is the May rule, not the add

ProcureAM’s June 17 Newsfile release says SpaceX “has been added to the fund following the latest reconstitution of the VettaFi Space Index,” and “joins UFO at a weight of 6.17% as of June 16th, 2026, following its public listing on June 12th, 2026” (ProcureAM / Newsfile, 2026-06-17). That is the ETF issuer, not VettaFi index governance. VettaFi’s May 14 article (rule effective May 15) says pure-plays with market cap >$500 billion become “immediately eligible,” with weights set at the close of the first trading day, and a mega-cap cap of 15% if float market cap is above $100 billion (VettaFi, 2026-05-14). The official June rebalance PDF on index-docs.vettafi.com was not fetched (PDF, off the *.gov whitelist). Day-0 VettaFi is therefore issuer-confirmed for UFO / SPACE tracking, not VettaFi-primary-confirmed. 6.17% is well below the 15% cap — consistent with float scarcity, but that inference is not in the issuer release.

Realized float vs the pre-IPO ~5% claim

424B4 (June 12) capitalization, Class A + Class B:

SharesPercent of A+B
Existing investors (base deal)12,520,309,62095.8%
New investors (base 555,555,555)555,555,5554.2%
Total (base)13,075,865,175100%

If the overallotment is exercised in full, “new investors in this offering would own approximately 4.9%” and existing investors “approximately 95.1%”; new-investor consideration would be “approximately $86,249,999,880” (SpaceX 424B4, 2026-06-12). Class A outstanding immediately after the offering: 7,380,196,910 base, or 7,463,530,243 with the option; Class B 5,695,668,265 in either case (SpaceX 424B4).

The greenshoe did exercise (SpaceX IR; 10-Q). So the 424B4’s ~4.9% overallotment case is the relevant IPO-print float, not the 4.2% base row. That is in the same band as the wiki’s ~5% / $75B S-1 claim, refined: the base print was 4.2% / $75.0 billion; the closed print is ~4.9% of A+B and 638.9 million shares. Do not treat later lockup releases as IPO float — those are a different chain.

FTSE Russell’s projected “share total” of 527,777,000 is not the 555.6 million offered and not the 638.9 million closed (FTSE Russell notice). Leave that gap: the notice does not explain the haircut.

Vanguard (June 10, pre-listing) said index weight would be based on “around 5% of its shares being available to the public” and expected first weights “1% or less” (Vanguard, 2026-06-10). Post-listing Fool figures (Russell 1000 ETFs 0.13%, VTI <0.2%, Nasdaq-100 <1%) sit in that band (Motley Fool, 2026-07-06; Motley Fool, 2026-07-07).

Day 10 / Baron’s “second index” — still open

Checked this pass, not resolved:

  • S&P Total Market fast-track remains the wiki’s leading candidate. The June 8 IWF alternative made a fast-track possible. This pass found no fetched S&P announcement that TMI/CI/TSM actually added SPCX. Vanguard’s June 10 table expected TMI / Completion “after close of the 5th trading day,” which would be a Day-5 event, not Day 10 (Vanguard, 2026-06-10).
  • MSCI is a new Day-10 candidate, not a resolution. Vanguard’s same table lists MSCI “approximately after close of the 10th trading day after IPO” (Vanguard, 2026-06-10). Motley Fool (July 6) says MSCI USA / ACWI already hold SPCX (ACWI weight 0.08%) (Motley Fool, 2026-07-06). No MSCI official notice was fetched.
  • Russell’s actual calendar (June 26 after close) is closer to ten trading days from June 12 than to five, but FTSE’s own notice frames it as fast-entry + reconstitution, not as Baron’s “second index.” Do not re-label Russell as Day 10 to force the cadence.

Leave Day 10 open.

Contradictions and open questions

  • S&P 500 December 2026 window is contradicted. The June 8 implementation the wiki was watching applied only to TMI/CI/TSM IWF. S&P 500 rules did not change (S&P DJI press, 2026-06-04).
  • Russell Day-5 claim vs June 26 reconstitution print. Fast-entry criteria were satisfied; the effective date was the reconstitution close, not a Day-5 standalone (FTSE Russell notice).
  • Nasdaq-100 forced-buying magnitude. Pre-IPO vault range was ~$7–12B. Fool’s July 7 recap cites $4.3B (Motley Fool, 2026-07-07). Official Nasdaq release body was not fetched.
  • CRSP June 18 is Fool-only this pass (Motley Fool, 2026-07-06). CRSP/Morningstar Indexes primary notice not found / Morningstar page blocked.
  • S&P TMI actual add — no press.spglobal.com SPCX notice found. Still the leading Day-10 hypothesis, not a fact.
  • VettaFi official rebalance PDF not fetched (off-whitelist). UFO issuer says 6.17% as of June 16 (ProcureAM / Newsfile).
  • FTSE share total 527,777,000 vs 555.6M offered / 638.9M closed — unexplained in the notice.
  • Grokipedia still has SpaceX private as of March 2026 (Grokipedia, SpaceX).
  • Day 10 identity still open. Do not invent it.

Provenance

Rounds run: 3 of 3

Sub-questions by round:

Round 1 (broad survey):

  1. Did SPCX list around June 12, 2026, and on which venue/ticker?
  2. Which indices actually added SPCX after listing (Russell/CRSP, Nasdaq-100, VettaFi, S&P TMI, S&P 500)?
  3. Did the proposed S&P rule change (comment period through May 28; June 8 if approved) pass?
  4. What is the realized public / free float versus the pre-IPO ~5% claim?
  5. Does any fetched primary identify Baron’s Day-10 index?

Round 2 (drill-down):

  1. Fetch a working copy of the Nasdaq-100 addition release — targeting the ir.nasdaq.com 403.
  2. Confirm CRSP and S&P TMI adds from provider or provider-adjacent pages — targeting missing official notices.
  3. Confirm VettaFi/UFO addition and 424B4 float table — targeting Day-0 and the 5% claim.

Round 3 (resolve remaining uncertainty):

  1. Official S&P TMI addition notice, if any — targeting the Day-10 / TMI gap.
  2. 424B4 capitalization + UFO issuer release — targeting float and VettaFi.

Anchor source (Grokipedia, fetched before round 1):

  • SpaceX — 25,017 chars extracted via _lib/grokipedia.py — primer only; still treats SpaceX as private as of March 24, 2026 and does not record the June listing or any index add.

URLs fetched (10 successful, 5 failed):

Round 1:

Round 2:

Round 3:

Not fetched (rule / reliability): VettaFi June rebalance PDF (index-docs.vettafi.com, off *.gov PDF whitelist). www.spglobal.com methodology PDFs appeared in search dumps; not treated as fetched HTML. CNBC / Bloomberg / Reuters left as search-only (CNBC Persistent-failure; Reuters Hard-blocked).

Tools used: WebSearch, WebFetch, grokipedia-fetch helper (_lib/grokipedia.py). Generated: 2026-08-26 17:30 UTC

Referenced by
Questions
SpaceX IPO: does the 5/10/15-day index inclusion cadence create a measurable passive-buying tailwind?
Entities
SpaceX