Comparable stake leader
OBF Investments, LLC
SEC ownership of iSpecimen Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001558569.
Disclosed value leader
George H. Scholl
Comparable rows
12/28
Latest evidence
31 Mar 2026
- Public ticker
- ISPC on Nasdaq
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
OBF Investments, LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
12 of 28
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
OBF Investments, LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001558569
- Issuer location
- Woburn, 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 iSpecimen 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
OBF Investments, LLC
Disclosed value leader
George H. Scholl
Comparable rows
12/28
Latest evidence
31 Mar 2026
3/4/5
13D/G
13F
Lead comparable stake: 4.4%
16 rows are not safely comparable across share classes.
13D/G row: OBF Investments, LLC
Showing 1-8 of 28 holder rows.
Quick read
OBF Investments, LLC leads the comparable SEC ownership view at 4.4%.
12 of 28 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 OBF Investments, LLC's linked filing trail.
Comparable ownership
Top 5
OBF Investments, LLC
4.4%
GEODE CAPITAL MANAGEMENT, LLC
33%
JANE STREET GROUP, LLC
5.8%
UBS Group AG
5.6%
CITADEL ADVISORS LLC
5.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 28 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| OBF Investments, LLC |
3/4/5
13D/G
10%+ Owner · Scholl George H.
|
4.4%
from 13D/G
|
$606,226
841,981 shares
|
— | 21 Jun 2021 |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
Company
|
33%
|
$49,155
313,098 shares
|
— | 31 Mar 2026 |
| JANE STREET GROUP, LLC |
13F
Company
|
5.8%
|
$8,734
55,631 shares
|
— | 31 Mar 2026 |
| UBS Group AG |
13F
Company
|
5.6%
|
$8,438
53,744 shares
|
— | 31 Mar 2026 |
| CITADEL ADVISORS LLC |
13F
Company
|
5.3%
|
$7,924
50,471 shares
|
— | 31 Mar 2026 |
| VANGUARD FIDUCIARY TRUST CO |
13F
Company
|
2.9%
|
$4,423
28,170 shares
|
— | 31 Mar 2026 |
| StoneX Group Inc. |
13F
Company
|
2.1%
|
$3,094
19,710 shares
|
— | 31 Mar 2026 |
| Tower Research Capital LLC (TRC) |
13F
Company
|
0.69%
|
$1,044
6,651 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
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 16 Jul 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 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 1-19 of 19 reporting-owner rows connected to iSpecimen Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
19
Largest Forms 3/4/5 holder
George H. Scholl
Net 12M change
$0
Latest report
07 Nov 2025
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| George H. Scholl | Director | $608,476 | Mixed | 03 Jan 2023 | ||
| OBF Investments, LLC | 10%+ Owner | $606,226 | Mixed | 21 Jun 2021 | ||
| Christopher Ianelli | Director | $320,358 | Mixed | 03 Jan 2023 | ||
| Jill Mullan | Director | $191,383 | Mixed | 17 Jan 2023 | ||
| Benjamin Bielak | Chief Info Officer & Secretary | $60,731 | Filing P/S | 14 Sep 2023 | ||
| Tracy Curley | CEO, CFO and Treasurer, Director | $35,670 | Mixed | 31 May 2023 | ||
| Andrew L. Ross | Director | $17,768 | Mixed | 02 Jan 2024 | ||
| Steven R. Ph.D. Gullans | Director | $17,768 | Mixed | 02 Jan 2024 | ||
| John L. Brooks III | Director | $17,768 | Mixed | 02 Jan 2024 | ||
| Theresa L. Mock | Director | $8,836 | Mixed | 02 Jan 2024 | ||
| Elizabeth Ames Graham | Director | $2,335 | Mixed | 21 Mar 2024 | ||
| Margaret H. Lawrence | Director | $2,250 | Mixed | 31 Dec 2022 | ||
| Richard Paolone | Director | $860 | Mixed | 25 Sep 2024 | ||
| Katharyn Field | Director | $860 | Mixed | 25 Sep 2024 | ||
| Avtar Dhaliwal | Director | $860 | Mixed | 25 Sep 2024 | ||
| Joseph J. Basile | Director | $45 | Mixed | 03 Jan 2023 | ||
| Yuying Liang | Chief Financial Officer | Mixed | 13 Dec 2024 | |||
| Arphing Lee | Director | Mixed | 07 Nov 2025 | |||
| Robert Bradley Lim | Chief Executive Officer, Director | Mixed | 09 Dec 2024 |
Recent insider transactions for iSpecimen 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.