Equillium, Inc.
Equillium, Inc. (EQ) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · EQ · as of Sep 30, 2025
Ownership Breakdown
44
Institutional Holders
▲ 17 vs Q2
$42.40M
Total Inst. Value
▲ $39.66M vs Q2
35.52M
Shares Outstanding
freeFloat 49.39%
29.65M
13F Shares Held
▲ 20.94M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
EQ largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
ADAR1 CAPITAL MANAGEMENT, LLC pharmaceutical preparations | 5.56M | 15.57% | 15.57% | $7.95B | Nov 14, 2025 | NEW |
ADAGE CAPITAL PARTNERS GP, L.L.C. pharmaceutical preparations | 5.33M | 14.92% | 14.92% | $7.62B | Nov 14, 2025 | NEW |
DECHENG CAPITAL LLC pharmaceutical preparations | 4.45M | 12.45% | 12.45% | $6.36B | Nov 14, 2025 | — held |
WOODLINE PARTNERS LP pharmaceutical preparations | 3.51M | 9.82% | 9.82% | $5.02B | Nov 14, 2025 | NEW |
BALYASNY ASSET MANAGEMENT L.P. pharmaceutical preparations | 2.00M | 5.61% | 5.61% | $2.87B | Nov 14, 2025 | NEW |
STEMPOINT CAPITAL LP pharmaceutical preparations | 1.91M | 5.34% | 5.34% | $2.73B | Nov 14, 2025 | NEW |
TAKEDA PHARMACEUTICAL CO LTD pharmaceutical preparations | 1.82M | 5.11% | 5.11% | $2.61B | Nov 13, 2025 | — held |
VANGUARD GROUP INC pharmaceutical preparations | 1.31M | 3.68% | 3.68% | $1.88B | Nov 7, 2025 | ▲ 489.9K |
RENAISSANCE TECHNOLOGIES LLC pharmaceutical preparations | 614.9K | 1.72% | 1.72% | $879.34M | Nov 13, 2025 | ▲ 340.8K |
CANTOR FITZGERALD, L. P. pharmaceutical preparations | 425.0K | 1.19% | 1.19% | $607.75M | Feb 17, 2026 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
9
Increased
+1.18M shares23
New Positions
first time holders6
Decreased
−115.3K shares6
Sold Out
fully exitedNet shares change (top 50)
+1.07M
+1.18M / −115.3K
Net new holders
+20
23 new / 6 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
EQ insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
12
Buy transactions
15
Sell transactions
0.80
Buy/Sell ratio
$1M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Zedelmayer Christine Sr. Vice President and COO | Jun 5, 2026 | Sale | 14,584 | $2.93 | $42.7K | 62.6K | Form 4 ↗ |
Connelly Stephen President and CSO | Jun 4, 2026 | Sale | 200,000 | $3.16 | $632.8K | 793.0K | Form 4 ↗ |
Connelly Stephen President and CSO | Jun 5, 2026 | Sale | 30,975 | $2.94 | $91.1K | 762.0K | Form 4 ↗ |
Tom Penny Principal Accounting Officer | May 28, 2026 | Sale | 65,000 | $2.95 | $191.8K | 0 | Form 4 ↗ |
DEMSKI MARTHA J director | May 28, 2026 | Award | 70,000 | $2.84 | $198.8K | 70.0K | Form 4 ↗ |
Pruzanski Mark director | May 28, 2026 | Award | 70,000 | $2.84 | $198.8K | 70.0K | Form 4 ↗ |
BRADBURY DANIEL CHAIRMAN | May 28, 2026 | Award | 70,000 | $2.84 | $198.8K | 70.0K | Form 4 ↗ |
Zedelmayer Christine Sr. Vice President and COO | May 28, 2026 | Sale | 55,604 | $2.70 | $150.1K | 62.8K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Equillium, Inc. (EQ) is primarily owned by institutional investors, who hold approximately 83.5% of total shares outstanding. Company insiders own approximately 50.61%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Equillium, Inc. is ADAR1 CAPITAL MANAGEMENT, LLC, holding approximately 5.56 million shares — equal to 15.57% of outstanding shares — as of September 30, 2025.
A total of 44 institutional investors currently hold EQ stock, with a combined institutional value of approximately $42,404,318 as of the most recent 13F filing period.
Frequently asked questions
EQ ownershipEquillium, Inc. (EQ) is primarily owned by institutional investors, who hold approximately 83.5% of shares. The largest shareholder is ADAR1 CAPITAL MANAGEMENT, LLC with a 15.57% stake. Company insiders hold 50.61%. Data sourced from SEC Form 13F as of September 30, 2025.