Comparable stake leader
INTRACOASTAL CAPITAL, LLC
SEC ownership of Amesite Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001807166.
Disclosed value leader
Mark N. Tompkins
Comparable rows
13/22
Latest evidence
28 Apr 2026
- Public ticker
- AMST on Nasdaq
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- INTRACOASTAL CAPITAL, LLC
- Latest 13D/G holder
- INTRACOASTAL CAPITAL, LLC
- Latest parsed ownership date
- 28 Apr 2026
- Issuer CIK
- 0001807166
- Issuer location
- Ann Arbor, MI
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Amesite Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
INTRACOASTAL CAPITAL, LLC
Disclosed value leader
Mark N. Tompkins
Comparable rows
13/22
Latest evidence
28 Apr 2026
13D/G
13F
3/4/5
Lead comparable stake: 5%
9 rows are not safely comparable across share classes.
13D/G row: INTRACOASTAL CAPITAL, LLC
Showing 1-8 of 22 holder rows.
Quick read
INTRACOASTAL CAPITAL, LLC leads the comparable SEC ownership view at 5%.
13 of 22 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens INTRACOASTAL CAPITAL, LLC's linked filing trail.
Comparable ownership
Top 5
INTRACOASTAL CAPITAL, LLC
5%
Focus Partners Wealth
2.8%
GEODE CAPITAL MANAGEMENT, LLC
0.91%
STATE STREET CORP
0.54%
VANGUARD CAPITAL MANAGEMENT LLC
0.51%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 22 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| INTRACOASTAL CAPITAL, LLC |
13D/G
Mitchell P. Kopin
|
5%
|
$311,190
293,575 shares
|
$0 | 27 Apr 2026 |
| Focus Partners Wealth |
13F
Company
|
2.8%
|
$305,469
166,016 shares
|
— | 31 Mar 2026 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
0.91%
|
$98,585
53,579 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13F
Company
|
0.54%
|
$58,135
31,595 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
0.51%
|
$55,570
30,201 shares
|
— | 31 Mar 2026 |
| VANGUARD FIDUCIARY TRUST CO |
13F
Company
|
0.23%
|
$25,320
13,761 shares
|
— | 31 Mar 2026 |
| XTX Topco Ltd |
13F
Company
|
0.17%
|
$18,682
10,153 shares
|
— | 31 Mar 2026 |
| OSAIC HOLDINGS, INC. |
13F
Company
|
0.17%
|
$18,400
10,000 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$599,999.
Buys
$599,999
Insiders: 2
Sells
$0
Insiders: 0
Net
+$599,999
Shares: +418,118
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 418,118
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 418,118 | 0 | $599,999 | $0 | +$599,999 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-12 of 12 reporting-owner rows connected to Amesite Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
12
Largest Forms 3/4/5 holder
Mark N. Tompkins
Net 12M change
+$599,999
Latest report
28 Apr 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mark N. Tompkins | 10%+ Owner | $5,103,671 | Filing P/S | 28 May 2021 | ||
| Ann Marie Sastry | CHIEF EXECUTIVE OFFICER, Director | $4,132,536 | +$250,000 | +6.4% | Filing P/S | 28 Apr 2026 |
| George Parmer | Director | $953,453 | +$349,999 | +58% | Mixed | 28 Apr 2026 |
| J. Michael Losh | Director | $473,165 | Mixed | 31 Mar 2026 | ||
| Gilbert S. Omenn | Director | $450,822 | Mixed | 31 Mar 2026 | ||
| Barbie Brewer | Director | $291,872 | Mixed | 31 Mar 2026 | ||
| Anthony M. Barkett | Director | $85,159 | Mixed | 30 Sep 2024 | ||
| Richard Ogawa | Director | $85,159 | Mixed | 30 Sep 2024 | ||
| Sarah Berman | Pfo & Pao | Mixed | 15 Dec 2024 | |||
| Matthew Kern | Chief Financial Officer | Mixed | 14 May 2021 | |||
| Sherrie Farrell | Chief Financial Officer | Mixed | 15 Dec 2022 | |||
| Mark Corrao | Chief Financial Officer | Mixed | 15 Dec 2021 |
Recent insider transactions for Amesite Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Ann Marie Sastry | AMST | Common Stock | Purchase | 19.9% | $250,000 | $1.44 | 174,216 | 1,049,647 | 28 Apr 2026 | Direct |
| Ann Marie Sastry | AMST | Series A-2 Warrants (right to buy) | Purchase | 174,216 | 174,216 | 28 Apr 2026 | Direct | |||
| Ann Marie Sastry | AMST | Series A-1 Warrants (right to buy) | Purchase | 174,216 | 174,216 | 28 Apr 2026 | Direct | |||
| George Parmer | AMST | Common Stock | Purchase | 75.5% | $349,999 | $1.44 | 243,902 | 566,962 | 28 Apr 2026 | Direct |
| George Parmer | AMST | Series A-2 Warrants (right to buy) | Purchase | 243,902 | 243,902 | 28 Apr 2026 | Direct | |||
| George Parmer | AMST | Series A-1 Warrants (right to buy) | Purchase | 243,902 | 243,902 | 28 Apr 2026 | Direct | |||
| Gilbert S. Omenn | AMST | Restricted Stock Units | Award | 9.55% | 6,522 | 74,783 | 31 Mar 2026 | By Gilbert S. Omenn Revocable Trust | ||
| Barbie Brewer | AMST | Restricted Stock Units | Award | 33.1% | 7,541 | 30,322 | 31 Mar 2026 | Direct | ||
| George Parmer | AMST | Restricted Stock Units | Award | 10.6% | 6,522 | 67,887 | 31 Mar 2026 | Direct | ||
| J. Michael Losh | AMST | Restricted Stock Units | Award | 9.55% | 7,880 | 90,363 | 31 Mar 2026 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | ||
| George Parmer | AMST | Common Stock | Options Exercise | 14.7% | 41,322 | 323,060 | 07 Mar 2026 | Direct | ||
| George Parmer | AMST | Restricted Stock Units | Options Exercise | -100% | -41,322 | 0 | 07 Mar 2026 | Direct | ||
| Barbie Brewer | AMST | Common Stock | Options Exercise | 43.7% | 41,322 | 135,977 | 07 Mar 2026 | Direct | ||
| Barbie Brewer | AMST | Restricted Stock Units | Options Exercise | -100% | -41,322 | 0 | 07 Mar 2026 | Direct | ||
| Gilbert S. Omenn | AMST | Common Stock | Options Exercise | 40.4% | 41,322 | 143,699 | 07 Mar 2026 | By Gilbert S. Omenn Revocable Trust | ||
| Gilbert S. Omenn | AMST | Restricted Stock Units | Options Exercise | -100% | -41,322 | 0 | 07 Mar 2026 | By Gilbert S. Omenn Revocable Trust | ||
| J. Michael Losh | AMST | Common Stock | Options Exercise | 42.6% | 41,322 | 138,200 | 07 Mar 2026 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | ||
| J. Michael Losh | AMST | Restricted Stock Units | Options Exercise | -100% | -41,322 | 0 | 07 Mar 2026 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | ||
| J. Michael Losh | AMST | Restricted Stock Units | Award | 49,751 | 49,751 | 06 Feb 2026 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | |||
| Gilbert S. Omenn | AMST | Restricted Stock Units | Award | 49,751 | 49,751 | 06 Feb 2026 | By Gilbert S. Omenn Revocable Trust | |||
| George Parmer | AMST | Restricted Stock Units | Award | 49,751 | 49,751 | 06 Feb 2026 | Direct | |||
| Barbie Brewer | AMST | Restricted Stock Units | Award | 49,751 | 49,751 | 06 Feb 2026 | Direct | |||
| Gilbert S. Omenn | AMST | Restricted Stock Units | Award | 10.2% | 6,349 | 68,261 | 31 Dec 2025 | By Gilbert S. Omenn Revocable Trust | ||
| Barbie Brewer | AMST | Restricted Stock Units | Award | 47.6% | 7,341 | 22,781 | 31 Dec 2025 | Direct | ||
| George Parmer | AMST | Restricted Stock Units | Award | 11.5% | 6,349 | 61,365 | 31 Dec 2025 | Direct | ||
| J. Michael Losh | AMST | Restricted Stock Units | Award | 10.3% | 7,672 | 82,483 | 31 Dec 2025 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | ||
| Barbie Brewer | AMST | Restricted Stock Units | Award | 41.8% | 4,549 | 15,440 | 30 Sep 2025 | Direct | ||
| Gilbert S. Omenn | AMST | Restricted Stock Units | Award | 6.79% | 3,934 | 61,912 | 30 Sep 2025 | By Gilbert S. Omenn Revocable Trust | ||
| George Parmer | AMST | Restricted Stock Units | Award | 7.7% | 3,934 | 55,016 | 30 Sep 2025 | Direct | ||
| J. Michael Losh | AMST | Restricted Stock Units | Award | 6.79% | 4,754 | 74,811 | 30 Sep 2025 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | ||
| Gilbert S. Omenn | AMST | Restricted Stock Units | Award | 8.34% | 4,461 | 57,978 | 30 Jun 2025 | By Gilbert S. Omenn Revocable Trust | ||
| Barbie Brewer | AMST | Restricted Stock Units | Award | 90% | 5,158 | 10,891 | 30 Jun 2025 | Direct | ||
| J. Michael Losh | AMST | Restricted Stock Units | Award | 8.34% | 5,390 | 70,057 | 30 Jun 2025 | J. Michael Losh Irrevocable Qualified Annuity Trust #7 | ||
| George Parmer | AMST | Restricted Stock Units | Award | 9.57% | 4,461 | 51,082 | 30 Jun 2025 | Direct |
* marks a reported price that did not pass the local price check.