SPAC Market Update May 19, 2026: IRHO-Electra S-4, BSAA Extension Vote ($1.80B MTD)

by | May 19, 2026

  • Iron Horse Acquisition II (IRHO) amended its Electra merger agreement and filed a Form S-4 on .
  • Best SPAC I Acquisition Corp (BSAA) held an extension vote on .
  • Flag Ship Acquisition Corp (FSHP) set a extension vote today.
  • Plum Acquisition Corp IV (PLMK) amended its CTL Resources merger agreement on .
  • Cartesian Growth Corp III (CGCT) amended its merger agreement with Factorial Energy on .
  • May 2026 SPAC IPO activity reached 11 IPOs totaling $1,799M through .

Iron Horse Acquisition II (IRHO) amended its Electra merger agreement and filed a Form S-4 on . Separately, BSAA held an extension vote, FSHP set a extension vote, and May SPAC IPO activity reached 11 deals totaling $1,799M through the first 19 days.

SPAC IPO Update —

No SPAC IPOs priced on ; May MTD now stands at 11 IPOs totaling $1.80B over 19 sessions.

SPAC IPO Count

Monthly IPOs (last 13 months)
Latest: 11•Prior: 16•MoM: -5
22
May ’25
10
Jun ’25
13
Jul ’25
8
Aug ’25
14
Sep ’25
14
Oct ’25
10
Nov ’25
22
Dec ’25
24
Jan ’26
27Peak
Feb ’26
11
Mar ’26
16
Apr ’26
11
May ’26
Source: Boardroom Alpha
IPO Activity SnapshotMonth-to-date: 11 IPOs ($1.80B) vs. first 19 days of last month 6 ($785M) · 12-mo avg: 15.9/mo
 
 
New SPAC IPOs
Date Ticker Issuer IPO Size Trust Funding
May 15 GUAC BERTO ACQUISITION CORP II $274M  $41M overallotment 100.0%
May 15 CLSO ENERGY TRANSITION SPECIAL OPPORTUNITIES $150M 100.5%
May 15 IDAC IRON DOME ACQUISITION I CORP $150M 100.5%
May 15 PTAC PATRIOT ACQUISITION CORP $200M 100.5%
May 14 GSRV GSR V ACQUISITION CORP $200M  $30M overallotment 100.0%
May 13 BREZ BREEZE ACQUISITION CORP II $125M  $15M overallotment 100.2%
Source: Boardroom Alpha
 

Daily SPAC Update —

SPAC DEAL & EXTENSION VOTES SET
Flag Ship Acquisition Corp (FSHP) * EXTENSION VOTE SET: June 11, 2026 * trust $11.01

EXTENSION VOTES
BEST SPAC I ACQUISITION CORP (BSAA)vote -> extend from from to from

DeSPACs
May 18 | CAEP DeSPAC → Air (AIIR)Air, headquartered in Dubai, specializes in social inhalation products and operates in over 90 markets globally. Its portfolio includes Al Fakher, a prominent hookah brand, Hookah.com, a leading B2B e-commerce platform for hookah and shisha in North America, and OOKA, a charcoal-free shisha device. The company collaborates with independent laboratories to develop products that blend traditional practices with modern technology.

SEPARATE WARRANTS/RIGHTS
May 20: RRE VENTURES ACQUISITION CORP (RREV)
May 19: VERNAL CAPITAL ACQUISITION CORP (VECA)
May 18: FUTURE MONEY ACQUISITION CORP (FMAC)
May 18: INFLECTION POINT ACQUISITION CORP VI (IPFX)

OTHER SPAC NEWS
IRON HORSE ACQUISITION II CORP (IRHO) * S-4 FiledIRHO amended its merger agreement with Electra and filed a Form S-4, outlining updated terms and a merger timeline.
PLUM ACQUISITION CORP IV (PLMK) * Merger Agreement AmendmentAmendment extends key deadlines for Plum IV-CTL Resources deal (financials, antitrust, consents).
CARTESIAN GROWTH CORP III (CGCT) * Merger Agreement AmendmentAmendment to merger agreement: Cartesian III will rename to Factorial Energy, Inc. on closing; institutional investor funding arrangements.
SPRING VALLEY ACQUISITION CORP III (SVAC) * Merger Agreement AmendmentAmendment No.1 to the Business Combination Agreement adjusts SPAC redemption timing and the 15% equity incentive pool; updates closing forms.
IRON HORSE ACQUISITION II CORP (IRHO) * Merger Agreement AmendmentIRHO amended its merger agreement with Electra and filed a Form S-4, outlining updated terms and a merger timeline.

 

SPAC Executive & Director Moves —

SPAC Executive & Director Moves
Company Ticker Moves
BERTO ACQUISITION CORP II GUACU
  • On , Sam Lynn, Darla K. Anderson, and Constance K. Weaver were appointed as independent directors to the Company’s Board.  (view source)
GSR V ACQUISITION CORP GSRVU
  • On , Jonathan Cole, Jody Sitkoski, and Susie Kuan were appointed to the board of directors of the Company, with additional roles on the audit and compensation committees.  (view source)
IRON DOME ACQUISITION I CORP IDACU
  • On , Eyal Waldman, David DeWalt, and Paul Hodermarsky were appointed as directors of the Company, also joining various committees, with DeWalt as chair of the Audit Committee, Waldman as chair of the Compensation Committee, and Hodermarsky as chair of the Nominating and Corporate Governance Committee.  (view source)
MCKINLEY ACQUISITION CORP MKLY
  • Joseph Shaposhnik was appointed as an additional independent director of McKinley Acquisition Corporation, also designated as Class I Director, and assigned to the Audit and Compensation Committees effective .  (view source)
PATRIOT ACQUISITION CORP PTACU
  • On , James Barresi, Robert Jones, Michael Taff, and Joseph V. Topper, Jr. were appointed to the Board of Directors, with Jones, Taff, and Topper also appointed to key committees.  (view source)
Source: SEC EDGAR filings via Boardroom Alpha
 

SPAC Movers —

YESTERDAY’S TOP SPAC GAINERS
Company Ticker Change Price Stage
STONEBRIDGE ACQUISITION II CORP APAC 24.4% $ 13.08 Pre-Deal
BEST SPAC I ACQUISITION CORP BSAA 6.6% $ 11.00 Announced
JATT II ACQUISITION CORP TBD 4.1% $ 10.95 Pre-Deal
ASPAC III ACQUISITION CORP ASPC 2.8% $ 11.43 Announced
CHARLTON ARIA ACQUISITION CORP CHAR 1.6% $ 10.91 Pre-Deal
 
YESTERDAY’S TOP SPAC LOSERS
Company Ticker Change Price Stage
HORIZON SPACE ACQUISITION II CORP HSPT -9.2% $ 7.81 Announced
VOYAGER ACQUISITION CORP VACH -8.0% $ 9.53 Announced
GENERAL PURPOSE ACQUISITION CORP GPAC -5.3% $ 10.68 Pre-Deal
RISING DRAGON ACQUISITION CORP RDAC -3.8% $ 8.62 Announced
CANTOR EQUITY PARTNERS II INC CEPT -2.5% $ 11.91 Announced
Source: Boardroom Alpha market data
 

Frequently Asked Questions

What did Iron Horse Acquisition II file on ?

Iron Horse Acquisition II (IRHO) amended its merger agreement with Electra and filed a Form S-4 on , outlining updated terms and a merger timeline.

How many SPAC IPOs priced in May 2026 through May 19?

May 2026 produced 11 SPAC IPOs totaling $1,799M through , across the first 19 days in the period.

Which SPAC held an extension vote on ?

Best SPAC I Acquisition Corp (BSAA) held an extension vote on to extend its deadline from to .

Which SPAC set a extension vote?

Flag Ship Acquisition Corp (FSHP) set an extension vote for , according to the SPAC activity update.

How many SPACs filed other news today?

Four SPACs filed other news today, including IRHO, PLMK, CGCT and SVAC merger-agreement updates.


Recent Analysis

Daily SPAC: VACI-NorthStar, AIIR – May 18, 2026

Viking Acquisition Corp I (VACI) amended its NorthStar merger agreement, revising redemption timing and closing steps and clarifying tax treatment. Separately, CAEP completed its Air DeSPAC as AIIR. May MTD reached 11 SPAC IPOs / $1,775M through 18 days vs. 6 / $785M over the same span last month.

Daily SPAC: GUAC, IDAC IPOs Add $400M in SPAC Capital – May 15, 2026

2 SPAC IPOs priced today, with Berto Acquisition Corp. II (GUAC) raising $250M and Iron Dome Acquisition I Corp (IDAC) raising $150M; IDAC funded trust at 100.5% of par. May MTD totals 9 IPOs / $1,425M through 15 days vs. 5 / $725M over the same span last month. Separately, RAAQ advanced its IQM merger with an F-4 filing.

Daily SPAC: SIMA, CAEP-Air Redemptions – May 14, 2026

SIM Acquisition I (SIMA) lost $242M from trust on its extension approval to Jul. 12, 2027, and Cantor Equity Partners III (CAEP) cleared its Air deal after $234M in redemptions. Separately, GSR V Acquisition (GSRV) priced a $200M IPO, taking May MTD to 7 SPAC IPOs / $1,025M through 14 days.

Daily SPAC: BREZ $125M IPO, GPAT Non-Redemption Agreements – May 13, 2026

GP-ACT III Acquisition (GPAT) disclosed non-redemption agreements tied to extension and trust-amendment votes, with investors pledging support and no redemptions alongside sponsor share transfers. Breeze Acquisition Corp. II (BREZ) priced a $125M IPO today with 100.2% initial trust funding; May MTD is 6 IPOs for $825M through 13 sessions vs. 2 IPOs / $350M at the same point last month.

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