GDST SEC filings, in plain English
Everything Chi Special Acquisition Corp. has filed with the SEC that we hold — 40 filings, newest first, 10 with a plain-English summary of what changed and why it matters. Every row links to the primary document on EDGAR, so you can check the source rather than trust us.
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What changed: CHI Special Acquisition Corp., formerly Goldenstone Acquisition Ltd., filed its 10-K for the year ended March 31, 2026. It entered a Business Combination Agreement on June 26, 2024, filed its initial Form S-4 on January 30, 2025 and five amendments through August 5, 2025, with no assurance it will be declared effective or the deal completed. Non-affiliate market value was about $4.87 million and 1,866,406 shares were outstanding as of July 15, 2026. Extensions ran on deposits of $575,000 per three-month period, then $50,000 per one-month extension approved June 18, 2024. Why it matters: This is a shell three years past its original deadline whose S-4 has been amended five times without going effective, and whose entire public market value is about $4.87 million across 1,866,406 shares. Redemptions have shrunk the trust to the point where the extension economics changed from $575,000 per quarter to $50,000 per month, a fraction of the original per-share deposit. The representative has waived its deferred underwriting commission, which usually signals the underwriter no longer expects a payable closing.
What changed vs 2025-06-16trust $55.5M → $38.0M -31%deadline 2025-06-21 → 2026-12-21trust account, combination deadline, going-concern doubt2 moved · 1 with no prior record of ours
- Trust account
- $55.5M$38.0M
- Combination deadline
- 2025-06-212026-12-21
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as $17,450,908 left the trust between the two filings.
The clause …“investment held in the Trust Account for payment to redeeming stockholders of $38,044,345, the withdrawal of an investment held in the Trust Account amounting to $991,446, offset by the purchase of investment held in Trust Account”…
SpacBrain reads this as 548 days later than the previous record.
The clause …“the date by which the Company has to consummate a business combination until December 21, 2026, each such extension for an additional one (1) month period, from March 21, 2026 to December 21, 2026 provided that deposits of $1,500 per”…
The clause …“the working capital and extension loans. In connection with our assessment of going concern considerations in accordance with Financial Accounting Standards Board’s Accounting Standards Codification Subtopic 205-40, “Presentation of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: CHI Special Acquisition Corp., formerly Goldenstone Acquisition Ltd., reported that Pin Tai and Nan Sun resigned as directors for personal reasons effective June 2, 2026 and that Chung Fu Wing and Shangwei Chen were appointed the same day to fill the vacancies. Chung, 54, is a fund manager with 30 years in multi-asset investment and management consulting in Asia, formerly with Boston Consulting Group, Kearney and Arthur Andersen, a CFA charterholder with a Columbia MBA. Chen, 41, founded SJ Investment and is a director of medical device distributor Nien Tai Medical Instruments. Why it matters: Two directors leaving and two arriving on the same day at a shell that is three years past its original deadline is board turnover driven by the deal process rather than routine succession. Both incoming directors come from Asian investment and M&A backgrounds rather than from the target's industry, which is what a SPAC does when it is still working to get a registration statement effective. No trust value or redemption right changes; the extension economics of $50,000 a month continue to run.
What changed: Goldenstone Acquisition Limited called a special meeting for 11:00 a.m. Eastern Time on Tuesday, March 17, 2026 by teleconference to approve a Fourth Extension Amendment and Fourth Trust Amendment moving the deadline to complete a business combination from March 21, 2026 to December 21, 2026 in one-month increments, with the company depositing $1,500 into the trust for each month extended. The charter has already been amended on September 21, 2023, June 18, 2024 and June 18, 2025. Why it matters: The trust floor is high at about $13.03 per share, but the trust itself is down to $5.77 million - roughly 443,000 public shares remain after three prior extension cycles, so this is a shell with almost no float left. A $1,500 monthly deposit is nominal and does not meaningfully accrete the per-share value, meaning holders bear nine more months of deal risk for no compensation. Redemption at $13.03 is the reliable exit; failure of the vote forces dissolution.
What changed vs 2025-06-05deadline 2026-06-21 → 2026-12-21combination deadline, mandate language1 moved · 1 with no prior record of ours
- Combination deadline
- 2026-06-212026-12-21
- Mandate language
- not previously extractedwe intend to focus on for our Business Combination or the ab…
SpacBrain reads this as 183 days later than the previous record.
The clause “HICH THE COMPANY HAS TO CONSUMMATE A BUSINESS COMBINATION FROM JUNE 21, 2026 TO DECEMBER 21, 2026. For ☐ Against ☐ Abstain ☐ 2. PROPOSAL 2. FOURTH TRUST AMENDMENT — A PROPOSAL TO AMEND THE COMPANY’S INVESTMENT MANAGEMENT TRUST AGREEMENT,”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
- What changed vs 2025-11-19deadline 2025-11-21 → 2026-03-21
combination deadline, trust account, going-concern doubt1 moved · 2 with no prior record of ours
- Combination deadline
- 2025-11-212026-03-21
- Trust account
- $38.0M · unchanged
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as 120 days later than the previous record.
The clause …“the Working Capital Loans. In addition, if we are unable to complete a Business Combination within the Combination Period by March 21, 2026, if not further extended, our board of directors would proceed to commence a voluntary”…
The clause …“investment held in the Trust Account for payment to redeeming stockholders of $38,044,345, the withdrawal of an investment held in the Trust Account amounting to $838,369, offset by the purchase of investment held in Trust Account”…
The clause …“deficit of $ 5,814,103 . In connection with the Company’s assessment of going concern considerations in accordance with Financial Accounting Standards Board’s Accounting Standards Codification Subtopic 205-40, “Presentation of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
- What changed vs 2025-08-20deadline 2025-08-21 → 2025-11-21
combination deadline, trust account, going-concern doubt1 moved · 2 with no prior record of ours
- Combination deadline
- 2025-08-212025-11-21
- Trust account
- $38.0M · unchanged
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as 92 days later than the previous record.
The clause …“below (see Note 6). In addition, if the Company is unable to complete a Business Combination within the Combination Period by November 21, 2025, if not further extended, the Company’s board of directors would proceed to commence a”…
The clause …“investment held in the Trust Account for payment to redeeming stockholders of $38,044,345, the withdrawal of an investment held in the Trust Account amounting to $731,641, offset by the purchase of investment held in Trust Account”…
The clause …“deficit of $ 5,290,212 . In connection with the Company’s assessment of going concern considerations in accordance with Financial Accounting Standards Board’s Accounting Standards Codification Subtopic 205-40, “Presentation of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
- What changed vs 2025-02-14trust $55.5M → $38.0M -31%deadline 2025-06-21 → 2025-08-21
trust account, combination deadline, going-concern doubt2 moved · 1 with no prior record of ours
- Trust account
- $55.5M$38.0M
- Combination deadline
- 2025-06-212025-08-21
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as $17,450,908 left the trust between the two filings.
The clause …“Cash withdrawn from Trust Account for payment to redeeming stockholders - 38,044,345 Purchase of investment held in Trust Account ( 150,000 ) ( 250,000 ) Withdrawal of investment held in Trust Account to pay taxes - 653,510 Net”…
SpacBrain reads this as 61 days later than the previous record.
The clause …“the Working Capital Loans. In addition, if we are unable to complete a Business Combination within the Combination Period by August 21, 2025, if not further extended, our board of directors would proceed to commence a voluntary”…
The clause …“out from the Trust Account. In connection with the Company’s assessment of going concern considerations in accordance with Financial Accounting Standards Board’s Accounting Standards Codification Subtopic 205-40, “Presentation of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: Amendment No. 5 to Goldenstone Acquisition Limited's Form S-4, subject to completion dated August 5, 2025, with no explanatory note naming the change. The special meeting is virtual-only — the document states stockholders will not be able to attend in person — but the date, time and meeting URL are all blanks. Holders of common stock are asked to approve the Business Combination Agreement dated June 26, 2024 and amended on January 28, 2025, among Goldenstone, Pacifica Acquisition Corp., Infintium Fuel Cell Systems, Inc. and Yan (Chris) Feng as representative. Why it matters: A named third-party fairness opinion — from EntrepreneurShares LLC — is on the record here, which is a fact about process rather than about value and does not itself establish that the price is fair. The meeting is virtual-only with no in-person option, so a holder wanting to attend must use the platform, and the URL is not yet published. No date, time or registered share count appears in this portion, so this version fixes no deadline and no dilution ceiling.
outside datenothing moved · 1 with no prior record of ours
- Outside date
- 2025-09-30 · unchanged
The clause “Company without liability to the other if the Closing has not occurred prior to September 30, 2025 (the “ Outside Date ”); provided, however, that this Agreement may not be terminated without default under this Section 9.01(b) by or on”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: Amendment No. 4 to Goldenstone Acquisition Limited's Form S-4, subject to completion dated July 18, 2025, with no explanatory note naming the change. The document states the special meeting is virtual-only and that stockholders will not be able to attend in person, with the date, time and meeting URL left blank. Holders of common stock are asked to approve the Business Combination Agreement dated June 26, 2024 and amended on January 28, 2025, among Goldenstone, Pacifica Acquisition Corp., Infintium Fuel Cell Systems, Inc. and Yan (Chris) Feng as representative. Why it matters: The agreement dates from June 2024 with a single amendment in January 2025, and the registration statement is on its fourth amendment — the deal has been in registration for over a year at this point. The meeting is virtual-only, so attendance requires the platform, and no URL, date or time is published in this version. No registered share count appears in the extracted portion, so no dilution ceiling can be taken from it.
outside datenothing moved · 1 with no prior record of ours
- Outside date
- 2025-09-30 · unchanged
The clause “Company without liability to the other if the Closing has not occurred prior to September 30, 2025 (the “ Outside Date ”); provided, however, that this Agreement may not be terminated without default under this Section 9.01(b) by or on”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: Amendment No. 3 to Goldenstone Acquisition Limited's Form S-4, subject to completion dated June 18, 2025, with no explanatory note naming the change. The special meeting is virtual-only — stockholders will not be able to attend in person — with the date, time and meeting URL all left blank. Holders of common stock are asked to approve the Business Combination Agreement dated June 26, 2024 and amended on January 28, 2025, among Goldenstone, Pacifica Acquisition Corp., Infintium Fuel Cell Systems, Inc. and Yan (Chris) Feng as representative of the stockholders. Why it matters: Nothing that a holder could act on is fixed by this version: no date, no time, no meeting URL and no registered share count appear in the extracted portion. The transaction remains a merger of Pacifica Acquisition Corp. into Infintium, with Infintium surviving as a Goldenstone subsidiary, under an agreement signed in June 2024 and amended once in January 2025.
outside datenothing moved · 1 with no prior record of ours
- Outside date
- 2025-09-30 · unchanged
The clause “Company without liability to the other if the Closing has not occurred prior to September 30, 2025 (the “ Outside Date ”); provided, however, that this Agreement may not be terminated without default under this Section 9.01(b) by or on”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
- What changed vs 2024-06-03trust $60.2M → $55.5M -8%deadline 2024-06-21 → 2025-06-21
trust account, combination deadline, going-concern doubt2 moved · 1 with no prior record of ours
- Trust account
- $60.2M$55.5M
- Combination deadline
- 2024-06-212025-06-21
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as $4,661,038 left the trust between the two filings.
The clause …“Held in Trust Account As of March 31, 2025 and 2024, $ 18,666,931 and $ 55,495,253 , respectively, of the assets held in the Trust Account were held in money market funds, which are invested in U.S. Treasury securities. The”…
SpacBrain reads this as 365 days later than the previous record.
The clause …“below (see Note 6). In addition, if the Company is unable to complete a Business Combination within the Combination Period by June 21, 2025, if not further extended, the Company’s board of directors would proceed to commence a”…
The clause …“the working capital and extension loans. In connection with our assessment of going concern considerations in accordance with Financial Accounting Standard Board’s Accounting Standards Codification Subtopic 205-40, Presentation of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: Goldenstone Acquisition Limited called a special meeting for 11:00 a.m. Eastern Time on June 18, 2025 by teleconference to approve a Third Extension Amendment allowing up to twelve one-month extensions and a Third Trust Amendment moving the Business Combination Period from June 21, 2025 to June 21, 2026, with $50,000 deposited into trust for each month. The original period ran to March 21, 2023; nine extensions to June 21, 2024 cost $100,000 a month, and the June 18, 2024 amendment cut that to $50,000 through June 21, 2025. Why it matters: The monthly trust contribution has been halved once already, from $100,000 to $50,000, and by March 2026 Goldenstone would be asking for $1,500 a month - a ninety-eight percent reduction in what holders receive for waiting. Each cut transfers value from public shareholders to the sponsor while the deal signed in June 2024 remains unclosed. Redemption at the trust value, roughly $13.03 a share by late 2025, is the reliable alternative.
What changed vs 2024-06-05deadline 2025-06-21 → 2026-06-21combination deadline1 moved
- Combination deadline
- 2025-06-212026-06-21
SpacBrain reads this as 365 days later than the previous record.
The clause …“in full as follows: “In the event that the Corporation does not consummate a Business Combination by June 21, 2026 (such date being referred to as the “Termination Date”), the Corporation shall (i) cease all operations except for the”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: Amendment No. 2 to Goldenstone Acquisition Limited's Form S-4, subject to completion dated May 14, 2025, with no explanatory note naming the change. The special meeting is virtual-only — stockholders will not be able to attend in person — with the date, time and meeting URL all blank. Holders of common stock are asked to approve the Business Combination Agreement dated June 26, 2024 and amended on January 28, 2025, among Goldenstone, Pacifica Acquisition Corp., Infintium Fuel Cell Systems, Inc. and Yan (Chris) Feng as representative. Why it matters: This version fixes no date, no time, no meeting URL and no registered share count. What it records is the state of the underlying agreement as of May 2025: signed June 26, 2024 and amended once on January 28, 2025. The virtual-only format means a holder cannot attend in person and must use a platform whose address is not yet published.
outside datenothing moved · 1 with no prior record of ours
- Outside date
- 2025-09-30 · unchanged
The clause “Company without liability to the other if the Closing has not occurred prior to September 30, 2025 (the “ Outside Date ”); provided, however, that this Agreement may not be terminated without default under this Section 9.01(b) by or on”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: Goldenstone Acquisition Limited (a Delaware blank check company) filed Amendment No. 1 to its Form S-4; the preliminary proxy statement/prospectus inside is dated April 23, 2025. No explanatory note names the change. The special meeting will be held in a VIRTUAL-ONLY format — the document states stockholders will NOT be able to attend in person — with the date, time and meeting URL all left blank. Holders of common stock (par $0.0001) will be asked to approve the business combination and related proposals. Why it matters: This early amendment fixes nothing a holder can act on: no date, no time, no meeting URL, and no registered share count in the extracted portion. The virtual-only format is the one operative fact — attendance requires a platform whose address has not yet been published.
outside datenothing moved · 1 with no prior record of ours
- Outside date
- 2025-09-30 · unchanged
The clause “Company without liability to the other if the Closing has not occurred prior to September 30, 2025 (the “ Outside Date ”); provided, however, that this Agreement may not be terminated without default under this Section 9.01(b) by or on”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
- What changed vs 2024-11-14deadline 2025-11-21 → 2025-06-21
combination deadline, trust account, going-concern doubt1 moved · 2 with no prior record of ours
- Combination deadline
- 2025-11-212025-06-21
- Trust account
- $55.5M · unchanged
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as 153 days earlier than the previous record.
The clause …“Amendment”), to extend the date to consummate a business combination until June 21, 2025, as approved by the Company’s stockholders at the Annual Meeting. Pursuant to the Fourth Extension, the Company has deposited a total of eight”…
The clause …“in Trust Account As of December 31, 2024 and March 31, 2024, $ 18,473,627 and $ 55,495,253 , respectively, of the assets held in the Trust Account were held in money market funds, which are invested in U.S. Treasury securities. The”…
The clause …“deficit of $ 4,036,215 . In connection with the Company’s assessment of going concern considerations in accordance with Financial Accounting Standard Board’s Accounting Standards Codification Subtopic 205-40, Presentation of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
What changed: The original Form S-4 of Goldenstone Acquisition Limited, a Delaware blank check company, subject to completion dated January 29, 2025. Holders of common stock are asked to approve the Business Combination Agreement dated June 26, 2024 and amended on January 28, 2025 — the day before the prospectus date — among Goldenstone, Pacifica Acquisition Corp., a Delaware wholly owned subsidiary, and Infintium Fuel Cell Systems, Inc., a Delaware corporation and co-registrant on this filing. A separate proposal would adopt a Second Amended and Restated Certificate of Incorporation. Why it matters: This is the baseline of the Goldenstone / Infintium registration, filed one day after the single amendment to a business combination agreement signed seven months earlier. No vote date, meeting address or registered share count is fixed by it. The virtual-only format is stated from the outset, so there was never an in-person option for this meeting.
outside datenothing moved · 1 with no prior record of ours
- Outside date
- not previously extracted2025-09-30
SpacBrain reads this as the agreement may be terminated from 2025-09-30.
The clause “Company without liability to the other if the Closing has not occurred prior to September 30, 2025 (the “ Outside Date ”); provided, however, that this Agreement may not be terminated without default under this Section 9.01(b) by or on”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
- What changed vs 2024-08-14deadline 2025-06-21 → 2025-11-21
combination deadline, trust account, going-concern doubt1 moved · 2 with no prior record of ours
- Combination deadline
- 2025-06-212025-11-21
- Trust account
- $55.5M · unchanged
- Going-concern doubt
- stated · unchanged
SpacBrain reads this as 153 days later than the previous record.
The clause …“the Working Capital Loans. In addition, if we are unable to complete a Business Combination within the Combination Period by November 21, 2025, if not further extended, our board of directors would proceed to commence a voluntary”…
The clause …“Trust Account As of September 30, 2024 and March 31, 2024, $ 18,213,005 and $ 55,495,253 , respectively, of the assets held in the Trust Account were held in money market funds, which are invested in U.S. Treasury securities. The”…
The clause …“deficit of $ 3,798,362 . In connection with the Company’s assessment of going concern considerations in accordance with Financial Accounting Standard Board’s Accounting Standards Update (“ASU”) 2014-15, “Disclosures of”…
Read from stored SEC filing text by a regex — no model is involved — and each side links to the filing it came from. “Not previously extracted” is a statement about our record, not about the company: the clause may be present in wording we do not match.
In plain English
Redemption deadlinethe last day to hand shares back for cash
Set by the filing that calls the meeting. Tender after it and the company is under no obligation to pay you the trust value.
Cash in trust / trust per sharethe cash the company is holding for each public share
Filed quarterly in the 10-Q's XBRL. It earns interest between filings, so the figure on a given day is slightly higher than the last filed one — where we show that we label it an estimate.
Accession numberthe SEC's unique id for one filing
Every figure on this page carries the accession of the filing that states it, so you can open the primary document rather than trust us.