SIM Acquisition Corp. I
SIMA- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002014982
No open-market purchases or sales by SIM Acquisition Corp. I insiders were filed in the last 90 days; 6 institutions reported holding it in 13F filings for Q2 2026, worth $2.37M in total; no superinvestor holds it.
Holders of 5% or more of SIMA
Holders whose latest Schedule 13D or 13G filing reports 5% or more of SIM Acquisition Corp. I, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| SIM Sponsor 1 LLC | 13D | 93.20%7.65M shares | +68.50 ppfrom 24.70% | Feb 12, 20253 filings | May 15, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
24 Schedule 13D and 13G filings on SIM Acquisition Corp. I, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Sep 4, 20269:02 AM ET | Magnetar Financial LLCand 3 others | 13G/A | 0.00%0 shares | –Below 5% | Jun 30, 2026 | SEC |
| Aug 14, 202612:57 PM ET | Vivaldi Asset Management, LLCand 3 others | 13G/A | 0.00%0 shares | −5.63 ppfrom 5.63%Below 5% | Jun 30, 2026 | SEC |
| Aug 12, 20263:19 PM ET | AQR Capital Management LLCand 2 others | 13G/A | 0.00%0 shares | −6.36 ppfrom 6.36%Below 5% | Jun 30, 2026 | SEC |
| Aug 11, 202610:12 AM ET | Picton Mahoney Asset Management | 13G/A | 0.00%0 shares | −5.65 ppfrom 5.65%Below 5% | Jun 30, 2026 | SEC |
| Jun 5, 20264:03 PM ET | Karpus Management, Inc. | 13G/A | 0.00%0 shares | −6.25 ppfrom 6.25%Below 5% | May 29, 2026 | SEC |
| May 15, 20264:50 PM ET | SIM Sponsor 1 LLCand 2 others | 13D | 93.20%7.65M shares | +68.50 ppfrom 24.70% | May 11, 2026 | SEC |
| May 15, 20264:04 PM ET | Vivaldi Asset Management, LLCand 3 others | 13G/A | 5.63%1.31M shares | – | Mar 31, 2026 | SEC |
| May 15, 20266:54 AM ET | Westchester Capital Management, LLC | 13G/A | 3.34%767.6K shares | −1.99 ppfrom 5.33%Below 5% | Mar 31, 2026 | SEC |
| Apr 27, 202611:05 AM ET | Picton Mahoney Asset Management | 13G/A | 5.65%1.30M shares | −2.18 ppfrom 7.83% | Mar 31, 2026 | SEC |
| Feb 19, 20266:01 PM ET | SIM Sponsor 1 LLCand 2 others | 13G/A | 24.70%7.53M shares | +0.20 ppfrom 24.50% | Jan 28, 2026 | SEC |
| Nov 10, 20252:10 PM ET | Goldman Sachs Group Incand 1 other | 13G/A | 4.20%969.5K shares | –Below 5% | Sep 30, 2025 | SEC |
| Aug 14, 20254:11 PM ET | Karpus Management, Inc. | 13G/A | 6.25%1.92M shares | −2.17 ppfrom 8.42% | Jun 30, 2025 | SEC |
| Aug 14, 20256:03 AM ET | Westchester Capital Management, LLC | 13G | 5.33%1.22M shares | New | Jun 30, 2025 | SEC |
| Aug 12, 20255:28 PM ET | MMCAP International Inc. SPCand 1 other | 13G/A | 4.26%980.0K shares | −4.35 ppfrom 8.61%Below 5% | Jun 30, 2025 | SEC |
| Aug 12, 20255:20 PM ET | Barclays PLC | 13G/A | 4.29%987.4K shares | −1.86 ppfrom 6.15%Below 5% | Jun 30, 2025 | SEC |
| Aug 6, 20255:32 PM ET | Picton Mahoney Asset Management | 13G/A | 7.83%1.80M shares | +1.74 ppfrom 6.09% | Apr 30, 2025 | SEC |
| May 14, 202512:25 PM ET | AQR Capital Management LLCand 2 others | 13G/A | 6.36%1.46M shares | – | Mar 31, 2025 | SEC |
| May 13, 20255:03 PM ET | MMCAP International Inc. SPCand 1 other | 13G/A | 8.61%1.98M shares | 0.00 ppfrom 8.61% | Mar 31, 2025 | SEC |
| Mar 21, 20255:58 PM ET | Barclays PLC | 13G/A | 6.15%1.42M shares | 0.00 ppfrom 6.15% | Sep 30, 2024 | SEC |
| Feb 14, 20254:06 PM ET | Karpus Management, Inc. | 13G/A | 8.42%1.94M shares | – | Dec 31, 2024 | SEC |
| Feb 12, 20254:30 PM ET | SIM Sponsor 1 LLCand 3 others | 13G | 24.50%7.47M shares | New | Dec 31, 2024 | SEC |
| Feb 11, 202512:53 PM ET | Picton Mahoney Asset Management | 13G/A | 6.09%1.40M shares | – | Dec 31, 2024 | SEC |
| Feb 10, 20257:00 PM ET | MMCAP International Inc. SPCand 1 other | 13G/A | 8.61%1.98M shares | – | Dec 31, 2024 | SEC |
| Nov 13, 202410:29 AM ET | Barclays PLC | 13G | 6.15%1.42M shares | New | Sep 30, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell SIM Acquisition Corp. I shares.
No Form 144 notices for SIM Acquisition Corp. I are on file.