Comparable stake leader
Spring Mountain Capital G.P., LLC
SEC ownership of IsoPlexis Corp
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001615055.
Disclosed value leader
Spring Mountain Capital G.P., LLC
Comparable rows
0/6
Latest evidence
16 Jun 2022
- Parsed ownership sources
-
3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Spring Mountain Capital G.P., LLC
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
16 Jun 2022
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001615055
- Issuer location
- Branford, CT
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of IsoPlexis Corp (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
Spring Mountain Capital G...
Disclosed value leader
Spring Mountain Capital G...
Comparable rows
0/6
Latest evidence
16 Jun 2022
3/4/5
Highest disclosed value: $4,404,762
6 rows are not safely comparable across share classes.
Quick read
Spring Mountain Capital G.P., LLC has the largest disclosed position value at $4.4M.
0 of 6 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 Spring Mountain Capital G.P., LLC's linked filing trail.
Disclosed position value
Top 4
Spring Mountain Capital G.P., LLC
$4.4M
PERCEPTIVE ADVISORS LLC
$2.97M
Northpond Capital GP, LLC
$1.51M
Peter Siesel
$101.7K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-6 of 6 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Spring Mountain Capital G.P., LLC |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$4,404,762
6,064,661 shares
|
— | 12 Oct 2021 |
| PERCEPTIVE ADVISORS LLC |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$2,974,560
4,095,498 shares
|
— | 12 Oct 2021 |
| Northpond Capital GP, LLC |
3/4/5
10%+ Owner
|
—
class O/S missing
|
$1,511,402
2,080,961 shares
|
— | 12 Oct 2021 |
| Peter Siesel |
3/4/5
Chief Commercial Officer
|
—
mixed-class rows
|
$101,682
223,300 shares
mixed-class rows
|
— | 06 Apr 2022 |
| Michael Egholm |
3/4/5
Director
|
—
class O/S missing
|
—
89,047 shares
|
— | 16 Jun 2022 |
| Siddhartha Kadia |
3/4/5
Director
|
—
class O/S missing
|
—
89,047 shares
|
— | 16 Jun 2022 |
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 02 Aug 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 1-18 of 18 reporting-owner rows connected to IsoPlexis Corp. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
Spring Mountain Capital G.P., LLC
Net 12M change
$0
Latest report
21 Mar 2023
Recent insider transactions for IsoPlexis Corp
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.