Autoresearch: As of 19 Sep 2026, has RSP outperformed Mag7 since the SpaceX IPO, and has the lockup sieve / index bid behaved as written?

Generated by /autoresearch on 2026-09-19. Synthesized across 2 rounds from total-return prints and lockup/index calendars. See Provenance. Treat as raw material — review before promoting into a project or thread. Context: vault/projects/stock-market Research-only. No buy/sell/size.

Summary

Directionally, equal-weight has beaten Mag7 in 2026: RSP +13.09% YTD vs MAGS +5.96% through 11 Sep (YoY +14.77% vs +14.38%). That is the Step 5 sign. It is not a cited isolation of Mitchell’s $86B placement / Mag7 forced-selling channel versus the buyback-bid-gone / AI-capex rotation already on sibling pages. Step 4’s “Elon by November” sieve stays S-1-falsified (Musk locked 366d / Jun 2027). Steps 4–5 stay partial. Do not treat YTD RSP leadership as a confirmed 9–12 month seasoning close.

Findings

RSP vs MAGS is the right sign, wrong identification

Total Real Returns through Fri 11 Sep 2026: RSP YTD +13.09%, MAGS YTD +5.96%; 1-yr +14.77% / +14.38%. MAGS still dominates the 2023-launch window (+193% vs +56%). MAGS drawdown from a 14 May peak is only −1.48%; RSP from 14 Aug is −3.55% (Total Real Returns). A second cut through 4 Sep has RSP YTD +15.26% vs MAGS +5.28% (VOO/XMAG/RSP/MAGS).

No fetched primary attributes the 2026 spread to SpaceX-forced Mag7 selling. Sibling mega-issuance-peak-to-ai-capex-derate already has a faded SPCX tape and no announced capex cuts.

Index / lockup mechanics

Motley Fool (11 Sep): Nasdaq-100 rebalance 21 Sep; JPM ~$15.5B forced buying as weight rises with float — the opposite near-term of “index houses cannot buy.” Eligible float still ~17%. Dec 8 / post-Q3 1.3B still ahead. Musk locked to Jun 2027 (Motley Fool). Direxion (June primer): initial NDX weight “modest because its public float is limited”; lockups through 2027 could take weight toward 4–5% (Direxion).

Contradictions and open questions

• Step 5 falsifier (“cap-weight outperforms RSP in 3–6 months after list”) has not fired on 2026 YTD MAGS vs RSP. Three months post-12 Jun is ~12 Sep — the window is just closing as this is written.
• Attribution remains open. Do not re-rate RSP/Mag7.
• [[spacex-ipo-index-inclusion-mechanic]] and [[spacex-ipo-post-listing-entry-timing]] stay.

Provenance

Rounds run: 2 of 3 (early-exit — YTD print + lockup calendar answered the open step’s observable). X sources: attempted via X search_news; spend-cap 403. Not used. Grokipedia: not used for any 2026 claim.

Web sources:

• RSP vs MAGS — total return — YTD through 11 Sep.
• VOO/XMAG/RSP/MAGS — corroborating YTD cut.
• Motley Fool — 21 Sep NDX / $15.5B / Musk 2027.
• Direxion — float-capped initial weight.

Generated: 2026-09-19