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SCHEDULE 13D/A Filed 2026-04-08 Event 2026-04-06 Intent: STRATEGIC SEC 0001437749-26-011780 →

BOSTON OMAHA Corp → Sky Harbour Group Corp SKYH-WT

Stake: 45.60% Shares: 19,059,773 CUSIP: 83085C107 Class: Class A common stock, par value $0.0001 per share
Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 24/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: -17.1%
  • Filer track record (3 filings): 0% 90d win rate, +0.0% 90d edge
  • High conviction ownership stake (45.6%)
  • Active catalyst intent classification: strategic
  • 7 NPORT-P mutual funds holding CUSIP
AI Analyst Brief conf: medium
Boston Omaha is slowly trimming its 45.6% stake in Sky Harbour via open-market sales ($5.2M gross over ~1 year at $9–$12/share), with the latest 331,500-share sale on April 6 triggering this amendment; no strategic agenda change signaled, just a large strategic holder monetizing a position at the margin.

Item 4 — Purpose of Transaction

Item 4 of the Schedule 13D is hereby supplemented as follows: From April 25, 2025 through April 6, 2026, the Reporting Person sold an aggregate of 534,124 shares of Class A Stock at price ranging between $9.05 and $11.99 per share, for total gross proceeds of $5,205,072.59, pursuant to an effective registration statement and under Rule 144 under the Securities Act of 1933, as amended. As a consequence, the Reporting Person's beneficial ownership decreased to 19,059,773 shares of Class A Stock (including the 7,719,779 Warrant Shares). The Reporting Person's beneficial ownership represents 45.56% of the outstanding Class A Stock and 22.72% of the combined voting Common Stock, a decrease primarily caused by such sale by the Reporting Person of 331,500 shares of Class A Stock on April 6, 2026 and additional shares sold during the period from April 25, 2025 through May 30, 2025. A schedule of each such sale transaction by the Reporting Person is attached hereto as Exhibit 4.1.

Cross-References

Insider Activity (last 365d)
2 transactions
1 buys · 1 sales · 0 awards/exercises
Issuer Cluster
4 13D/G filings on this issuer
3 other filings besides this one
Filer Track Record
4 filings by this filer
3 other filings in the data moat
Short Interest
—
Not in latest FINRA snapshot

Post-Filing Returns · since 2026-04-06 on SKYH-WT

+1 day
0.0%
+5 days
0.0%
+30 days
-51.1%
+60 days
-51.1%
+90 days
-51.1%
+180 days
—

Anchor price 0.88 on closest trading day on/after 2026-04-06. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

DateInsiderRoleTypeSharesPriceValue
2026-09-11 Gonzalez Francisco officer Buy 1,000 $10.08 $10K
2026-08-11 BOSTON OMAHA Corp 10%+ owner Sale 360,000 $10.00 $3.60M

Other 13D/G Filings on Sky Harbour Group Corp

FiledFormFilerStakeShares
2026-08-13 SCHEDULE 13D/A BOSTON OMAHA Corp 40.50% 18,699,773 view →
2025-04-28 SCHEDULE BOSTON OMAHA Corp 47.20% 19,593,897 view →
2025-02-12 SCHEDULE BOSTON OMAHA Corp 48.60% 19,942,588 view →

Other Filings by BOSTON OMAHA Corp

FiledFormIssuerStakeShares
2026-08-13 SCHEDULE 13D/A Sky Harbour Group Corp 40.50% 18,699,773 view →
2025-04-28 SCHEDULE Sky Harbour Group Corp SKYH-WT 47.20% 19,593,897 view →
2025-02-12 SCHEDULE Sky Harbour Group Corp SKYH-WT 48.60% 19,942,588 view →

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