Sphere Entertainment Co. (SPHR) — Reincorporation detail

Announcement

2025-04-08

First SEC disclosure

Meeting / Vote

2025-06-04

COMPLETED

Effective

2025-06-05

Legal effective date

Market Cap

$5.5B

At announcement

Why this firm matters

Standard cohort firm (Completed). Included for breadth across destinations and sectors.

Vote outcome — reincorporation proposal

Approval standard: majority of the voting power of the outstanding stock entitled to vote (DGCL §266 conversion). Meeting type: annual.

Vote totals not yet pulled. Awaiting EDGAR Item 5.07.

Event-study abnormal returns — announcement window

Returns around the announcement date.

Event date: 2025-04-08 · Estimation window: 2024-04-23 to 2025-04-07 (240 days)

Specification	Day-0 AR	Inference
Synthetic control (14-donor Communication Services peer pool)i	-2.16%	no inference
Market model (SPY benchmark)i	-1.82%	Patell-z p-value = 0.498
Sector-augmented model (SPY + Communication Services ETF (XLC)) HEADLINEi	-1.81%	Patell-z p-value = 0.497
Matched pair (vs META, market-model-adjusted)i	-2.73%	two-sided p-value = 0.384
Raw differential vs METAi	-3.15%	no inference

Robustness checks — does the headline result hold up?

Three independent diagnostics that interrogate the headline estimate from different angles. All three pointing the same way = high confidence in the result.

Pre-event drift check: the firm's daily abnormal return drifted by -0.0037% per day in the pre-event window (p = 0.185). no detectable pre-event drift âœ“. — A near-zero slope means the pre-event period was stable, so the day-0 reaction is not contamination from a pre-existing trend.
Donor co-movement check: 13 of 14 peer firms moved in the same direction as the treated firm on the event day (binomial p = 0.0018). — A high concordance means the day was driven by industry-wide news rather than something firm-specific. A low concordance means the firm moved differently from peers (potential firm-specific signal).
Synthetic-control fit quality: pre-event correlation between the firm and its synthetic twin = 0.033 (weak tracking — interpret with caution); RÂ² = -4.133 (fraction of pre-event variance explained); Durbin-Watson = 2.09 (no autocorrelation). — Higher correlation + higher RÂ² + Durbin-Watson near 2 means the synthetic peer was a good match before the event, so the post-event gap is interpretable.

Event-study abnormal returns — vote window

Returns around the shareholder-vote (or written-consent) date.

Event date: 2025-06-05 · T0 source: actual_effective_date_iso · Estimation window: trailing 240 days; 240 valid after NaN drop

Specification	Day-0 AR	Inference
Market model (SPY benchmark) HEADLINEi	+1.67%	Patell-z p-value = 0.550

Long-run abnormal returns & pooled estimates

Buy-and-hold abnormal returns (1 / 3 / 6 / 12 months) and calendar-time portfolio alpha (CTE) post-effective.

Effective date: 2025-06-05 · n_post = 226 days

Buy-and-hold abnormal returns (BHAR)

Horizon & benchmark	BHAR	Inference
1 month vs S&P 500	+10.57%	Patell-z = +0.75 · p = 0.454 · n = 21 days
1 month vs sector ETF (XLC)	+10.95%	Patell-z = +0.75 · p = 0.454 · n = 21 days
3 months vs S&P 500	+21.53%	Patell-z = +0.95 · p = 0.340 · n = 63 days
3 months vs sector ETF (XLC)	+18.72%	Patell-z = +0.95 · p = 0.340 · n = 63 days
6 months vs S&P 500	+105.63% ^***	Patell-z = +2.34 · p = 0.019 · n = 126 days
6 months vs sector ETF (XLC)	+107.95% ^***	Patell-z = +2.34 · p = 0.019 · n = 126 days

Calendar-time portfolio alpha (CTE)

Specification	Annualized alpha	Inference
Calendar-time portfolio alpha vs S&P 500	+216.60%/yr ^***	t = +2.47 · p = 0.014 · n = 226 days · Newey-West HAC SE (lag=5)
Calendar-time portfolio alpha vs sector ETF	+263.23%/yr ^***	t = +2.82 · p = 0.005 · n = 226 days · Newey-West HAC SE (lag=5)

Cohort-level robustness battery

Heckman selection-corrected ATE · Romano-Wolf step-down + BH FDR · pooled BHAR. This firm's reading is shown in context of the full cohort.

Heckman two-step selection correction (controlled-vs-widely-held)

Cohort ATE = +0.94% (SE = 7.06%, n = 2395) after correcting for controller-status selection (inverse Mills ratio = -0.062).

Romano-Wolf step-down + Benjamini-Hochberg FDR (n = 47)

This firm: raw p = 0.497, Romano-Wolf adjusted p = 1.000, BH-FDR adjusted p = 0.966. Multiple-hypothesis correction is computed across the full cohort to control family-wise error rate at alpha = 0.05.

Pooled cohort BHAR (mover firms only)

BHAR_63d: mean = -5.60% (SE = 22.11%, n = 3, p = 0.499) · BHAR_126d: mean = +17.33% (SE = 41.17%, n = 3, p = 0.774)

See Cohort event study → for the full battery and forest plots.

Nevada Statutory Disclosures

Nevada Revised Statutes (NRS) governance provisions relevant to Delaware→Nevada redomestications. Five sections summarized; each links to the Nevada Legislature’s authoritative NRS text. Counterpart to the Texas § 21.552 / § 21.373 panel for TX-destination firms.

NRS § 78.138 — Director / officer fiduciary duty

Codifies the business-judgment rule and limits monetary liability of directors and officers absent breach of loyalty, intentional misconduct, fraud, or knowing violation of law. Stronger statutory shield than DGCL § 102(b)(7) on its face; charter opt-out / carve-out is firm-specific.

PENDING VERIFICATION

Adoption with carve-out by Sphere Entertainment Co.: primary-source verification pending; canonical record not yet populated.

NRS § 78.7502 — Indemnification of directors / officers

Broad permissive indemnification statute; covers expenses, judgments, fines, and amounts paid in settlement for any action by reason of service as director or officer, subject to good-faith standard. Charter / bylaw uptake is firm-specific.

PENDING VERIFICATION

Sphere Entertainment Co. indemnification provisions pending charter / bylaw extraction.

NRS §§ 78.378–3793 — Acquisition of controlling interest

Nevada's control-share acquisition statute (anti-takeover): voting rights of shares acquired in a “control-share acquisition” are extinguished absent disinterested-shareholder approval. Opt-out is by charter or bylaw amendment; default is opt-in for Nevada corporations meeting the statute's coverage thresholds.

PENDING VERIFICATION

Sphere Entertainment Co. opt-in / opt-out status pending charter or bylaw verification.

NRS §§ 78.411–444 — Combinations with interested stockholders

Nevada's business-combination statute (anti-takeover): for two years post-acquisition, a Nevada corporation may not engage in a “combination” with a 10%+ interested stockholder unless the board pre-approved the transaction. Charter opt-out available.

PENDING VERIFICATION

Sphere Entertainment Co. opt-in / opt-out status pending charter verification.

NRS § 92A.135 — Conversion mechanism (DGCL § 266 analog)

Authorizes conversion of a foreign business entity into a Nevada domestic entity by filing articles of conversion. The Nevada analog to DGCL § 266 (Delaware) and TBOC §§ 10.101–108 (Texas). Where used, the firm's redomestication is a true legal-entity conversion rather than a reverse-triangular merger.

PENDING VERIFICATION

Mechanism (§ 92A.135 conversion vs. merger-with-NV-sub) pending primary-source verification.

Primary-source pending. Where badges read “PENDING VERIFICATION,” the firm-specific adoption posture (e.g., charter carve-outs to NRS § 78.138, opt-outs from NRS §§ 78.378–3793 or 78.411–444) has not yet been extracted from the firm’s amended-and-restated articles or proxy materials. The presence of a Nevada incorporation alone does not establish adoption of every provision; opt-outs are charter-level facts.

Source filings

Primary-source documents on SEC EDGAR plus IR / search links.

IR — https://investor.sphereentertainmentco.com/
EDGAR — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001795250&type=&dateb=&owner=include&count=40
Proxy — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001795250&type=DEF+14A&dateb=&owner=include&count=40
8-K Item 5.07 (vote) · 0001193125-25-135929 — filing →

Classification & audit trail

Bucket

Panel eligibility

PANEL_B_post_SB29

Audit status

VERIFIED | PATCHED_v6-rev77_2026-05-24_wave1b_audit_fixes: per firm_roster_audit_2026-05-24.md + batch summaries

Source confidence

VERIFIED_VOTE

Transaction status

COMPLETED

Audit notes

Phase 3F: cleared future meeting_date_iso=2026-06-04 — firm already moved (eff_date=2025-06-05); the future date was the next annual meeting at the new domicile, not the reincorporation vote.
Phase 3F vote-result inferred APPROVED from status=COMPLETED + populated eff date (2025-06-05). Original vote_result was 'SCHEDULED'. Verify with 8-K if uncertain.
[2026-04-28] Phase 4I: replaced Google-search IR fallback with direct URL https://investor.sphereentertainmentco.com/
[2026-04-28] Phase 4K: corrected year error (announcement 2026-04-02 -> 2025-04-08). Annual meeting 2025-06-04; eff 2025-06-05. Dolan-cluster firm (with MSGE/MSGS/AMCX). Mcap at effective ~$1.3B.
[2026-04-28] Phase 4N: synthesized event_study_announcement_json from existing scalar CAR cells (phase4a_v2 join). Reviewer can extend with multi-spec analysis.
[2026-04-28] Phase 4Q: audit_status PENDING_TRANSACTION -> VERIFIED. Effective 2025-06-05; Dolan-cluster firm with MSGE/MSGS/AMCX. [2026-04-28] phase5c: vote source 8-K 0001193125-25-135929 (2025-06-05, Δ=1d) applied from EDGAR pull (status=AUTO_RESOLVED) [2026-04-28] phase5c: vote source 8-K 0001193125-25-135929 (2025-06-05, Δ=1d) applied from EDGAR pull (status=AUTO_RESOLVED) [2026-04-29] phase5r: bucket 'D' -> 'B2' (DE->NV effective 2025-06-05 >= SB29 -> bucket B2) [2026-04-29] phase5w: comprehensive validation by external reviewer across tranches v3 (4-version full residual walk, 269 substantive answers across 52 firms, 0 bucket drifts vs v3.58)
[2026-04-29] v3.75: VERIFIED — DGCL §266 conversion at annual meeting June 4, 2025. Dolan-family-controlled. Per Glass Lewis 2025 DExit report: of Dolan-controlled DExit firms, MSGE and SPHR received majority support from unaffiliated shareholders. Item 5.07 pincite still pending.
[2026-04-30] v3.84-rev5r-patch: SPHR panel letter correction (PANEL_A -> PANEL_B): panel_eligibility PANEL_A_post_SB29 -> PANEL_B_post_SB29. SPHR has panel_a_tx_incumbent=0 and panel_b_dexit_mover=1; it is a Delaware-to-Nevada redomestication (not a Texas incumbent), so the panel letter should be B. Pre/post-SB29 timing was already correct. Per Gemini and Grok v2 audit cross-validation.