Comparable stake leader
ARMISTICE CAPITAL, LLC
SEC ownership of Bluejay Diagnostics, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001704287.
Disclosed value leader
Kenneth R. Fisher
Comparable rows
17/25
Latest evidence
17 Aug 2026
- Public ticker
- BJDX on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
ARMISTICE CAPITAL, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
17 of 25
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
ARMISTICE CAPITAL, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
17 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001704287
- Issuer location
- Acton, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Bluejay Diagnostics, 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
ARMISTICE CAPITAL, LLC
Disclosed value leader
Kenneth R. Fisher
Comparable rows
17/25
Latest evidence
17 Aug 2026
13D/G
13F
3/4/5
Lead comparable stake: 10%
8 rows are not safely comparable across share classes.
13D/G row: ARMISTICE CAPITAL, LLC
Showing 1-8 of 25 holder rows.
Quick read
ARMISTICE CAPITAL, LLC leads the comparable SEC ownership view at 10%.
17 of 25 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 ARMISTICE CAPITAL, LLC's linked filing trail.
Comparable ownership
Top 5
ARMISTICE CAPITAL, LLC
10%
Ayrton Capital LLC
10%
INTRACOASTAL CAPITAL, LLC
10%
SABBY MANAGEMENT, LLC
4.9%
Anson Funds Management LP
1.4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 25 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ARMISTICE CAPITAL, LLC |
13D/G
13F
Company
|
10%
|
$199,819
142,728 shares
|
$0 | 30 Jun 2026 |
| Ayrton Capital LLC |
13D/G
|
10%
|
$150,811
107,722 shares
|
$0 | 30 Jun 2026 |
| INTRACOASTAL CAPITAL, LLC |
13D/G
Mitchell P. Kopin
|
10%
|
—
|
$0 | 03 Jun 2026 |
| SABBY MANAGEMENT, LLC |
13D/G
|
4.9%
|
$7,173
27,587 shares
|
$0 | 31 Dec 2024 |
| Anson Funds Management LP |
13D/G
|
1.4%
|
$25,756
367,950 shares
|
$0 | 31 Dec 2024 |
| L1 Capital Global Opportunities Master Fund, Ltd. |
13D/G
|
0.82%
|
$15,488
221,251 shares
|
$0 | 31 Dec 2024 |
| HRT FINANCIAL LP |
3/4/5
10%+ Owner
|
6.4%
|
$128,876
92,055 shares
|
+$47,798 | 09 Jul 2026 |
| Indranil Dey |
3/4/5
President and CEO, Director
|
2.8%
|
$48,778
40,649 shares
|
+$25,000 | 17 Aug 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: +$172,798.
Buys
$221,711
Insiders: 6
Sells
$48,913
Insiders: 1
Net
+$172,798
Shares: +91,609
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 126,547
Shares: 34,938
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 64,047 | 34,938 | $96,711 | $48,913 | +$47,798 |
| 3-6 | 62,500 | 0 | $125,000 | $0 | +$125,000 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-14 of 14 reporting-owner rows connected to Bluejay Diagnostics, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
Kenneth R. Fisher
Net 12M change
+$172,798
Latest report
17 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Kenneth R. Fisher | Chief Financial Officer | $347,475 | Mixed | 01 Feb 2023 | ||
| Jason Cook | Chief Technology Officer | $137,843 | Mixed | 07 Mar 2023 | ||
| HRT FINANCIAL LP | 10%+ Owner | $128,876 | +$47,798 | +59% | Filing P/S | 09 Jul 2026 |
| Gary G. Gemignani | Director | $84,425 | Mixed | 01 Feb 2023 | ||
| Gordon Winston Kinder | Chief Financial Officer | $56,795 | Mixed | 17 Mar 2022 | ||
| Indranil Dey | President and CEO, Director | $48,778 | +$25,000 | +105% | Median | 17 Aug 2026 |
| Svetlana Dey | Director | $25,244 | +$25,000 | +10246% | Mixed | 17 Aug 2026 |
| Douglas Clark Wurth | Director | $25,216 | +$25,000 | +11574% | Filing P/S | 17 Aug 2026 |
| Donald R. Chase | Director | $25,050 | +$25,000 | +50000% | Filing P/S | 17 Aug 2026 |
| Fred S. Zeidman | Director | $25,000 | +$25,000 | +100% | Filing P/S | 17 Aug 2026 |
| BANK OF AMERICA CORP /DE/ | 10%+ Owner | $14 | Mixed | 21 Jul 2026 | ||
| BOFA SECURITIES, INC. | 10%+ Owner | $14 | Mixed | 21 Jul 2026 | ||
| BANK OF AMERICA NA | 10%+ Owner | $14 | Mixed | 21 Jul 2026 | ||
| Frances P. Scally | Cfo | Mixed | 26 Sep 2023 |
Recent insider transactions for Bluejay Diagnostics, 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Fred S. Zeidman | BJDX | Stock Option (Right to Buy) | Award | 100,000 | 100,000 | 17 Aug 2026 | Direct | |||
| Douglas Clark Wurth | BJDX | Stock Option (Right to Buy) | Award | 100,000 | 100,000 | 17 Aug 2026 | Direct | |||
| Svetlana Dey | BJDX | Stock Option (Right to Buy) | Award | 100,000 | 100,000 | 17 Aug 2026 | Direct | |||
| Indranil Dey | BJDX | Common Stock | Award | 223.6% | 28,000 | 40,522 | 17 Aug 2026 | Direct | ||
| Donald R. Chase | BJDX | Stock Option (Right to Buy) | Award | 100,000 | 100,000 | 17 Aug 2026 | Direct | |||
| Hrt Financial Lp | BJDX | Common Stock | Sale | -27.5% | $48,913 | $1.40 | -34,938 | 92,055 | 10 Jul 2026 | Direct |
| Hrt Financial Lp | BJDX | Common Stock | Purchase | 101.8% | $96,711 | $1.51 | 64,047 | 126,993 | 09 Jul 2026 | Direct |
| Douglas Clark Wurth | BJDX | Common Stock | Purchase | 11574.1% | $25,000 | $2.00 | 12,500 | 12,608 | 14 Mar 2026 | Direct |
| Indranil Dey | BJDX | Common Stock | Purchase | 56818.2% | $25,000 | $2.00 | 12,500 | 12,522 | 14 Mar 2026 | Direct |
| Donald R. Chase | BJDX | Common Stock | Purchase | 50000% | $25,000 | $2.00 | 12,500 | 12,525 | 14 Mar 2026 | Direct |
| Fred S. Zeidman | BJDX | Common Stock | Purchase | $25,000 | $2.00 | 12,500 | 12,500 | 14 Mar 2026 | Direct | |
| Svetlana Dey | BJDX | Common Stock | Purchase | 1250000% | $25,000 | $2.00 | 12,500 | 12,501 | 14 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.