Comparable stake leader
JANUS HENDERSON GROUP PLC
SEC ownership of Equillium, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001746466.
Disclosed value leader
ADAR1 Capital Management, LLC
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- EQ on Nasdaq
- Parsed ownership sources
-
13F and 13D/G
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
JANUS HENDERSON GROUP PLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
JANUS HENDERSON GROUP PLC
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
- 0001746466
- Issuer location
- La Jolla, CA
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 Equillium, 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
JANUS HENDERSON GROUP PLC
Disclosed value leader
ADAR1 Capital Management,...
Comparable rows
50/50
Latest evidence
31 Mar 2026
13F
13D/G
Lead comparable stake: 10%
13D/G row: JANUS HENDERSON GROUP PLC
Showing 1-8 of 50 holder rows.
Quick read
JANUS HENDERSON GROUP PLC leads the comparable SEC ownership view at 10%.
50 of 50 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 JANUS HENDERSON GROUP PLC's linked filing trail.
Comparable ownership
Top 5
JANUS HENDERSON GROUP PLC
10%
Adage Capital Management, L.P.
10%
ADAR1 Capital Management, LLC
9.9%
RA CAPITAL MANAGEMENT, L.P.
9.9%
Decheng Capital Management IV (Ca...
8.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| JANUS HENDERSON GROUP PLC |
13F
13D/G
Company
|
10%
from 13D/G
|
$12,956,669
6,494,571 shares
|
— | 31 Mar 2026 |
| Adage Capital Management, L.P. |
13D/G
|
10%
|
$8,596,850
6,012,624 shares
|
$0 | 30 Sep 2025 |
| ADAR1 Capital Management, LLC |
13D/G
13F
Company
|
9.9%
|
$13,735,808
6,603,754 shares
|
+$850,454 | 31 Mar 2026 |
| RA CAPITAL MANAGEMENT, L.P. |
13D/G
13F
Company
|
9.9%
|
$11,275,564
6,480,209 shares
|
$0 | 13 Mar 2026 |
| Decheng Capital Management IV (Cayman), LLC |
13D/G
Xiangmin Cui
|
8.9%
|
$10,950,070
5,733,021 shares
|
$0 | 31 Mar 2026 |
| Woodline Partners LP |
13F
13D/G
Company
|
5.9%
from 13D/G
|
$7,001,802
3,500,901 shares
|
— | 31 Mar 2026 |
| Aberdeen Group plc |
13F
13D/G
Company
|
5.3%
from 13D/G
|
$6,705,674
3,352,837 shares
|
— | 31 Mar 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. |
13F
Company
|
8%
|
$10,658,832
5,329,416 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 selling over the last 12 months. Net value: -$2,430,494.
Buys
$0
Insiders: 0
Sells
$2,430,494
Insiders: 3
Net
-$2,430,494
Shares: -1,044,195
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 1,044,195
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 406,392 | $0 | $1,225,526 | -$1,225,526 |
| 3-6 | 0 | 494,001 | $0 | $999,786 | -$999,786 |
| 6-9 | 0 | 143,802 | $0 | $205,182 | -$205,182 |
| 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 Equillium, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
Stephen Connelly
Net 12M change
-$2,430,495
Latest report
05 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Stephen Connelly | President and CSO | $2,240,429 | -$723,830 | -24% | Filing P/S | 04 Jun 2026 |
| Christine Zedelmayer | Sr. Vice President and COO | $183,402 | -$1,506,487 | -89% | Filing P/S | 05 Jun 2026 |
| Jason A. Keyes | Chief Financial Officer | $82,311 | Mixed | 14 Feb 2025 | ||
| Joel Rothman | Chief Development Officer | $33,727 | Mixed | 02 Jan 2024 | ||
| Penny Tom | Principal Accounting Officer | $0 | -$200,178 | -100% | Mixed | 28 May 2026 |
| Bruce D. Steel | Chief Executive Officer, Director, 10%+ Owner | Mixed | 07 Jan 2026 | |||
| Bala S. Manian | Director | Mixed | 21 May 2025 | |||
| Charles Douglas McDermott | Director | Mixed | 28 May 2026 | |||
| Daniel Bradbury | CHAIRMAN, Director | Mixed | 28 May 2026 | |||
| Mark Pruzanski | Director | Mixed | 28 May 2026 | |||
| Martha J. Demski | Director | Mixed | 28 May 2026 | |||
| Barbara Troupin | Director | Mixed | 28 May 2026 | |||
| Ph.D. Yu Xu | Director | Mixed | 22 May 2024 | |||
| Peter Colabuono | Director | Mixed | 21 May 2025 |
Recent insider transactions for Equillium, 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Christine Zedelmayer | EQ | Common Stock | Sale | -18.9% | $42,737 | $2.93 | -14,584 | 62,586 | 05 Jun 2026 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 23.3% | 14,584 | 77,170 | 05 Jun 2026 | Direct | ||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Options Exercise | -36.4% | -14,584 | 25,521 | 05 Jun 2026 | Direct | ||
| Stephen Connelly | EQ | Common Stock | Sale | -3.91% | $91,070 | $2.94 | -30,975 | 762,025 | 05 Jun 2026 | Direct |
| Stephen Connelly | EQ | Common Stock | Sale | -20.1% | $632,760 | $3.16 | -200,000 | 793,000 | 04 Jun 2026 | Direct |
| Penny Tom | EQ | Common Stock | Sale | -100% | $191,750 | $2.95 | -65,000 | 0 | 28 May 2026 | Direct |
| Penny Tom | EQ | Common Stock | Options Exercise | 65,000 | 65,000 | 28 May 2026 | Direct | |||
| Penny Tom | EQ | Employee Stock Option (right to buy) | Options Exercise | -100% | -65,000 | 0 | 28 May 2026 | Direct | ||
| Martha J. Demski | EQ | Director Stock Option (right to buy) | Award | 70,000 | 70,000 | 28 May 2026 | Direct | |||
| Mark Pruzanski | EQ | Director Stock Option (right to buy) | Award | 70,000 | 70,000 | 28 May 2026 | Direct | |||
| Daniel Bradbury | EQ | Director stock option (right to buy) | Award | 70,000 | 70,000 | 28 May 2026 | Direct | |||
| Christine Zedelmayer | EQ | Common Stock | Sale | -57.9% | $240,693 | $2.80 | -86,012 | 62,586 | 28 May 2026 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 265.6% | 86,012 | 118,390 | 28 May 2026 | Direct | ||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Options Exercise | -100% | -86,012 | 0 | 28 May 2026 | Direct | ||
| Charles Douglas McDermott | EQ | Director Stock Option (right to buy) | Award | 70,000 | 70,000 | 28 May 2026 | Direct | |||
| Barbara Troupin | EQ | Director Stock Option (right to buy) | Award | 70,000 | 70,000 | 28 May 2026 | Direct | |||
| Christine Zedelmayer | EQ | Common Stock | Sale | -13.6% | $26,517 | $2.70 | -9,821 | 62,586 | 27 May 2026 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 15.7% | 9,821 | 72,407 | 27 May 2026 | Direct | ||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Options Exercise | -5.61% | -9,821 | 165,179 | 27 May 2026 | Direct | ||
| Christine Zedelmayer | EQ | Common Stock | Sale | -65.8% | $300,816 | $2.50 | -120,312 | 62,586 | 13 Mar 2026 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 192.2% | 120,312 | 182,898 | 13 Mar 2026 | Direct | ||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Options Exercise | -68.8% | -120,312 | 54,688 | 13 Mar 2026 | Direct | ||
| Christine Zedelmayer | EQ | Common Stock | Sale | -74.3% | $362,438 | $2.00 | -181,219 | 62,586 | 09 Mar 2026 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 166.6% | 152,361 | 243,805 | 09 Mar 2026 | Direct | ||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Options Exercise | -100% | -152,361 | 0 | 09 Mar 2026 | Direct | ||
| Christine Zedelmayer | EQ | Common Stock | Sale | -67% | $328,104 | $1.76 | -185,937 | 91,444 | 19 Feb 2026 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 1249.4% | 185,937 | 200,819 | 19 Feb 2026 | Direct | ||
| Penny Tom | EQ | Common Stock | Sale | -100% | $8,428 | $1.29 | -6,533 | 0 | 08 Jan 2026 | Direct |
| Stephen Connelly | EQ | Employee Stock Option (right to buy) | Award | 1,150,000 | 1,150,000 | 07 Jan 2026 | Direct | |||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Award | 500,000 | 500,000 | 07 Jan 2026 | Direct | |||
| Bruce D. Steel | EQ | Employee Stock Option (right to buy) | Award | 1,750,000 | 1,750,000 | 07 Jan 2026 | Direct | |||
| Penny Tom | EQ | Employee Stock Option (right to buy) | Award | 450,000 | 450,000 | 07 Jan 2026 | Direct | |||
| Christine Zedelmayer | EQ | Common Stock | Sale | -52.2% | $150,000 | $1.50 | -100,000 | 91,444 | 23 Dec 2025 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Options Exercise | 109.4% | 100,000 | 191,444 | 23 Dec 2025 | Direct | ||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Options Exercise | -100% | -100,000 | 0 | 23 Dec 2025 | Direct | ||
| Christine Zedelmayer | EQ | Common Stock | Sale | -11.5% | $15,589 | $1.31 | -11,900 | 91,444 | 15 Dec 2025 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Sale | -18.7% | $31,897 | $1.34 | -23,804 | 103,344 | 12 Dec 2025 | Direct |
| Christine Zedelmayer | EQ | Common Stock | Sale | -5.99% | $7,696 | $0.9504 | -8,098 | 127,148 | 25 Nov 2025 | Direct |
| Stephen Connelly | EQ | Employee Stock Option (right to buy) | Award | 1,025,000 | 1,025,000 | 29 Aug 2025 | Direct | |||
| Penny Tom | EQ | Employee Stock Option (right to buy) | Award | 525,000 | 525,000 | 29 Aug 2025 | Direct | |||
| Christine Zedelmayer | EQ | Employee Stock Option (right to buy) | Award | 725,000 | 725,000 | 29 Aug 2025 | Direct | |||
| Bruce D. Steel | EQ | Employee Stock Option (right to buy) | Award | 1,695,000 | 1,695,000 | 29 Aug 2025 | Direct |
* marks a reported price that did not pass the local price check.