SPYRE THERAPEUTICS INC SYRE
COM NEW · Common Stock · CUSIP 00773J202
Business enterprise in United States of America
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersWaltham, MA
- Founded2013
- Websiteaegleabio.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($8.5m this quarter). Holder counts are more reliable. Shares outstanding: 88.2m as of 2026-07-28, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $88.89. Options: 7 managers hold calls ($25.6m notional), 6 hold puts ($35.1m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2023 | 28 |
| Q4 2023 | 55 |
| Q1 2024 | 103 |
| Q2 2024 | 109 |
| Q3 2024 | 121 |
| Q4 2024 | 133 |
| Q1 2025 | 131 |
| Q2 2025 | 131 |
| Q3 2025 | 138 |
| Q4 2025 | 154 |
| Q1 2026 | 199 |
| Q2 2026 | 267 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 71 | 40 |
| Q4 2024 | 87 | 42 |
| Q1 2025 | 71 | 54 |
| Q2 2025 | 81 | 43 |
| Q3 2025 | 66 | 56 |
| Q4 2025 | 102 | 41 |
| Q1 2026 | 118 | 59 |
| Q2 2026 | 192 | 77 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $1.6m | $838.0k | 0.52 |
| Q4 2025 | $14.6m | $2.2m | 0.15 |
| Q1 2026 | $16.4m | $1.6m | 0.10 |
| Q2 2026 | $25.6m | $35.1m | 1.37 |
Biggest buyers
| Paradigm Biocapital Advisors LP | Added | +1.9m |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Added | +1.7m |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | New | +1.7m |
| Capital World Investors | Added | +1.6m |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +1.4m |
| FMR LLC | Added | +1.2m |
| GOLDMAN SACHS GROUP INC | Added | +1.2m |
| Holocene Advisors, LP | New | +1.0m |
| BlackRock, Inc. | Added | +985.4k |
| MARSHALL WACE, LLP | Added | +852.4k |
Biggest sellers
| Fairmount Funds Management LLC | Sold out | -4.0m |
| RA CAPITAL MANAGEMENT, L.P. | Sold out | -1.6m |
| Commodore Capital LP | Reduced | -1.1m |
| BAKER BROS. ADVISORS LP | Sold out | -1.0m |
| Caligan Partners LP | Sold out | -878.1k |
| Capital International Investors | Reduced | -790.9k |
| Venrock Adviser, LLC | Reduced | -700.0k |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | -243.3k |
| STEMPOINT CAPITAL LP | Reduced | -228.3k |
| BOOTHBAY FUND MANAGEMENT, LLC | Reduced | -186.6k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $13.8m155.2k shares |
| CITADEL ADVISORS LLC | New | $3.9m43.8k shares |
| JANE STREET GROUP, LLC | New | $3.7m41.3k shares |
| Caption Management, LLC | Reduced | $2.2m25.0k shares |
| GROUP ONE TRADING LLC | New | $1.0m11.5k shares |
| HRT FINANCIAL LP | New | $887.0k10.0k shares |
| SIMPLEX TRADING, LLC | New | $97.7k1.1k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $16.9m190.4k shares |
| Caption Management, LLC | New | $15.4m173.7k shares |
| JANE STREET GROUP, LLC | New | $1.9m21.3k shares |
| CITADEL ADVISORS LLC | Reduced | $701.4k7.9k shares |
| SIMPLEX TRADING, LLC | New | $150.9k1.7k shares |
| GROUP ONE TRADING LLC | Reduced | $26.6k300 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Fairmount Funds Management LLC 13D · may seek influence no change · filed 2026-10-09 | 10.0% |
| BlackRock, Inc. 13G · institution filed 2025-07-16 | 6.6% |
| Paradigm Biocapital Advisors LP 13G · passive investor new · filed 2026-10-01 | 5.1% |
Fell to 5% or below in the last year: PERCEPTIVE ADVISORS LLC (4.9%, 2026-08-14), RTW INVESTMENTS, LP (4.8%, 2026-08-14), VANGUARD GROUP INC (0.0%, 2026-03-27), TANG CAPITAL MANAGEMENT LLC (2.4%, 2026-02-17)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 1 | $257.2k | $257.2k |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 1 | $299.6k | — |
| Q4 2025 | 0 | — | 1 | $1.5m | $1.5m |
| Q1 2026 | 0 | — | 2 | $1.7m | $1.7m |
| Q2 2026 | 0 | — | 5 | $420.2m | $19.2m |
| Q3 2026 | 0 | — | 5 | $13.3m | $13.3m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-02 | Burrows Scott L Chief Financial Officer | Sold plan | $1.6m18.2k shares |
| 2026-09-02 | King-Jones Heidy Officer | Sold plan | $36.0k400 shares |
| 2026-09-01 | King-Jones Heidy Officer | Sold plan | $2.4m28.0k shares |
| 2026-09-01 | Turtle Cameron Chief Executive Officer, director | Sold plan | $1.3m15.0k shares |
| 2026-09-01 | Burrows Scott L Chief Financial Officer | Sold plan | $654.8k7.5k shares |
| 2026-08-07 | Albers Jeffrey W. Director | Sold plan | $1.9m18.0k shares |
| 2026-08-07 | Albers Jeffrey W. Director | Sold plan | $522.4k5.0k shares |
| 2026-08-03 | Turtle Cameron Chief Executive Officer, director | Sold plan | $1.4m15.0k shares |
| 2026-08-03 | Burrows Scott L Chief Financial Officer | Sold plan | $716.8k7.5k shares |
| 2026-07-01 | Turtle Cameron Chief Executive Officer, director | Sold plan | $1.3m15.0k shares |
| 2026-07-01 | Sloan Sheldon Chief Medical Officer | Sold plan | $730.9k8.3k shares |
| 2026-07-01 | Burrows Scott L Chief Financial Officer | Sold plan | $658.0k7.5k shares |
| 2026-06-25 | Burrows Scott L Chief Financial Officer | Sold | $1.3m15.0k shares |
| 2026-06-23 | Harwin Peter Evan +3 Director · By Fairmount Healthcare Fund II L.P. | Sold | $399.7m4.7m shares |
| 2026-06-22 | HENDERSON MICHAEL THOMAS Director | Sold plan | $2.0m20.0k shares |
| 2026-06-03 | Sloan Sheldon Chief Medical Officer | Sold plan | $625.0k8.3k shares |
| 2026-06-01 | Turtle Cameron Chief Executive Officer, director | Sold plan | $1.1m15.0k shares |
| 2026-06-01 | Burrows Scott L Chief Financial Officer | Sold plan | $532.9k7.5k shares |
| 2026-05-08 | HENDERSON MICHAEL THOMAS Director | Sold plan | $6.0m80.0k shares |
| 2026-05-01 | Sloan Sheldon Chief Medical Officer | Sold plan | $5.6m78.3k shares |
| 2026-05-01 | Turtle Cameron Chief Executive Officer, director | Sold plan | $1.1m15.0k shares |
| 2026-05-01 | Burrows Scott L Chief Financial Officer | Sold plan | $892.1k12.5k shares |
| 2026-04-01 | Turtle Cameron Chief Executive Officer, director | Sold plan | $739.9k15.0k shares |
| 2026-04-01 | Sloan Sheldon Chief Medical Officer | Sold plan | $397.9k8.0k shares |
| 2026-04-01 | Burrows Scott L Chief Financial Officer | Sold plan | $370.1k7.5k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.05% of their portfolio | 13.0m $1.2bn | Added +1.2m |
| BlackRock, Inc. 0.01% of their portfolio | 6.5m $577.7m | Added +985.4k |
| PERCEPTIVE ADVISORS LLC 5.95% of their portfolio | 4.3m $383.5m | Added +536.3k |
| RTW INVESTMENTS, LP 3.22% of their portfolio | 4.3m $377.5m | Added +80.0k |
| Paradigm Biocapital Advisors LP 6.38% of their portfolio | 3.8m $341.0m | Added +1.9m |
| VANGUARD CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 3.4m $306.2m | Added +391.3k |
| STATE STREET CORP 0.01% of their portfolio | 3.1m $271.4m | Added +450.4k |
| Venrock Adviser, LLC 8.04% of their portfolio | 3.0m $265.0m | Reduced -700.0k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.03% of their portfolio | 3.0m $262.9m | Added +1.4m |
| Driehaus Capital Management LLC 1.44% of their portfolio | 2.8m $248.5m | Added +8.4k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 2.6m $239.3m | Added +841.4k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.01% of their portfolio | 2.3m $206.9m | Added +1.7m |
| Capital World Investors 0.02% of their portfolio | 2.3m $205.6m | Added +1.6m |
| Jupiter Topco LLC 0.08% of their portfolio | 2.2m $195.9m | First filing |
| TCG Crossover Management, LLC 4.06% of their portfolio | 1.9m $168.7m | Unchanged |
| TANG CAPITAL MANAGEMENT LLC 7.63% of their portfolio | 1.9m $168.0m | Unchanged |
| BANK OF AMERICA CORP /DE/ 0.01% of their portfolio | 1.8m $157.8m | Added +549.8k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.21% of their portfolio | 1.7m $152.9m | New |
| WELLINGTON MANAGEMENT GROUP LLP 0.02% of their portfolio | 1.6m $140.4m | Reduced -243.3k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.5m $131.2m | Added +1.2m |
| FRANKLIN RESOURCES INC 0.03% of their portfolio | 1.5m $130.8m | Added +590.1k |
| Remedium Capital Partners, LLC 28.78% of their portfolio | 1.5m $130.0m | Added +7.9k |
| Affinity Asset Advisors, LLC 5.55% of their portfolio | 1.3m $113.6m | Unchanged |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 1.1m $98.9m | Added +113.7k |
| Holocene Advisors, LP 0.21% of their portfolio | 1.0m $90.1m | New |
| MARSHALL WACE, LLP 0.07% of their portfolio | 991.7k $88.0m | Added +852.4k |
| Polar Capital Holdings Plc 0.25% of their portfolio | 988.0k $87.7m | Added +195.2k |
| Siren, L.L.C. 1.75% of their portfolio | 968.6k $86.0m | Added +150.0k |
| Capital International Investors 0.02% of their portfolio | 955.2k $84.8m | Reduced -790.9k |
| BRAIDWELL LP 2.89% of their portfolio | 879.5k $78.1m | Reduced -53.4k |
| Commodore Capital LP 4.48% of their portfolio | 846.8k $75.2m | Reduced -1.1m |
| UBS Group AG 0.01% of their portfolio | 843.1k $74.8m | Added +171.8k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 674.5k $59.9m | Added +95.6k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 653.0k $58.0m | Added +90.3k |
| Pictet Asset Management Holding SA 0.05% of their portfolio | 628.1k $55.8m | Added +136.5k |
| EMERALD ADVISERS, LLC 1.19% of their portfolio | 567.4k $50.4m | Reduced -45.9k |
| VICTORY CAPITAL MANAGEMENT INC 0.03% of their portfolio | 554.0k $49.2m | Added +261.9k |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 551.4k $49.0m | Added +86.7k |
| Candriam S.C.A. 0.22% of their portfolio | 546.3k $48.5m | Reduced -64.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 522.1k $46.3m | Added +314.8k |
| MORGAN STANLEY 0.00% of their portfolio | 500.0k $44.4m | Added +253.2k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 431.7k $38.3m | Added +377.7k |
| EMERALD MUTUAL FUND ADVISERS TRUST 1.25% of their portfolio | 401.3k $35.6m | Reduced -6.8k |
| SAMLYN CAPITAL, LLC 0.59% of their portfolio | 400.1k $35.5m | Added +3.4k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 356.1k $31.6m | Added +196.9k |
| Integral Health Asset Management, LLC 1.18% of their portfolio | 325.0k $28.9m | New |
| Woodline Partners LP 0.08% of their portfolio | 306.0k $27.2m | Added +40.2k |
| JENNISON ASSOCIATES LLC 0.02% of their portfolio | 303.2k $26.9m | New |
| ADAR1 Capital Management, LLC 1.19% of their portfolio | 284.0k $25.2m | Reduced -54.3k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 259.9k $23.1m | Added +241.3k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 245.2k $21.8m | Added +53.8k |
| Bellevue Group AG 0.43% of their portfolio | 229.9k $20.4m | New |
| Cormorant Asset Management, LP 1.02% of their portfolio | 225.0k $20.0m | New |
| SEVEN GRAND MANAGERS, LLC 0.80% of their portfolio | 225.0k $20.0m | Added +125.0k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.24% of their portfolio | 201.6k $17.9m | New |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 196.7k $17.5m | Added +50.1k |
| ORBIMED ADVISORS LLC 0.31% of their portfolio | 186.1k $16.5m | New |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.15% of their portfolio | 182.9k $16.2m | New |
| Nuveen, LLC 0.00% of their portfolio | 181.1k $16.1m | Added +27.2k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 180.9k $16.1m | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 174.5k $15.5m | Added +45.2k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.02% of their portfolio | 172.9k $15.4m | Added +2.5k |
| Balyasny Asset Management L.P. 0.02% of their portfolio | 147.0k $13.1m | Added +91.6k |
| Soleus Capital Management, L.P. 0.45% of their portfolio | 147.0k $13.1m | New |
| Squarepoint Ops LLC 0.02% of their portfolio | 139.6k $12.4m | New |
| ARMISTICE CAPITAL, LLC 0.34% of their portfolio | 137.6k $12.2m | Added +16.7k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 134.8k $12.0m | Added +124.8k |
| Ensign Peak Advisors, Inc 0.02% of their portfolio | 126.6k $11.2m | Reduced -21.9k |
| Invesco Ltd. 0.00% of their portfolio | 120.5k $10.7m | Reduced -11.8k |
| Blackstone Inc. 0.03% of their portfolio | 120.2k $10.7m | Reduced -172.7k |
| Rhenman & Partners Asset Management AB 1.00% of their portfolio | 119.3k $10.6m | New |
| TD Asset Management Inc 0.01% of their portfolio | 116.0k $10.3m | Reduced -21.4k |
| Swiss National Bank 0.01% of their portfolio | 112.5k $10.0m | Added +16.0k |
| STEMPOINT CAPITAL LP 1.64% of their portfolio | 106.9k $9.5m | Reduced -228.3k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.01% of their portfolio | 104.5k $9.3m | Reduced -8.3k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 103.1k $9.2m | Reduced -5.0k |
| Boxer Capital Management, LLC 0.67% of their portfolio | 100.0k $8.9m | New |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 94.8k $8.4m | Added +9.6k |
| BARCLAYS PLC 0.00% of their portfolio | 94.1k $8.4m | Added +48.3k |
| F/m Investments LLC 0.42% of their portfolio | 92.6k $8.2m | Reduced -6.8k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 92.5k $4.7m | Added +21.6k |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 87.4k $7.8m | Added +27.8k |
| FEDERATED HERMES, INC. 0.01% of their portfolio | 86.0k $7.6m | New |
| Granahan Investment Management, LLC 0.26% of their portfolio | 83.0k $7.4m | New |
| CITIGROUP INC 0.00% of their portfolio | 82.6k $7.3m | Added +70.6k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 82.5k $7.3m | Added +49.3k |
| HighVista Strategies LLC 1.57% of their portfolio | 77.8k $6.9m | Reduced -68.5k |
| MERCER GLOBAL ADVISORS INC /ADV 0.01% of their portfolio | 71.1k $6.3m | Added +54 |
| B Group, Inc. 3.53% of their portfolio | 70.0k $6.2m | Reduced -30.0k |
| Trexquant Investment LP 0.04% of their portfolio | 67.0k $5.9m | New |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 64.7k $5.7m | Added +5.4k |
| Informed Momentum Co LLC 0.48% of their portfolio | 60.4k $5.4m | New |
| SILVERARC CAPITAL MANAGEMENT, LLC 0.59% of their portfolio | 60.0k $5.3m | Reduced -126.7k |
| PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio | 59.7k $5.3m | Added +55.4k |
| Hudson Bay Capital Management LP 0.02% of their portfolio | 58.4k $5.2m | New |
| Atle Fund Management AB 1.36% of their portfolio | 57.0k $5.1m | Reduced -5.7k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 53.6k $4.8m | Added +33.9k |
| Susquehanna Portfolio Strategies, LLC 0.08% of their portfolio | 53.1k $4.7m | Unchanged |
| ROYCE & ASSOCIATES LP 0.04% of their portfolio | 51.8k $4.6m | New |
| XTX Topco Ltd 0.06% of their portfolio | 50.5k $4.5m | Added +26.0k |