Fairmount Funds Management LLC

Director · Ten-percent owner · APGE, CBIO, ORKA, SYRE, JBIO, VRDN …

As of 2026-09-16, Fairmount Funds Management LLC has 138 Form 4 transactions on record across 9 companies — 126 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Pattern in the record: open-market purchases filed in July in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.

Reconstructed holdings

Direct: $580KIndirect: $1.5B$1.5Bas of 2026-09-16
  • Direct $580K
  • Indirect $1.5B
ORKAindirect4,685,364 sh$438.3M
SYREindirect4,684,781 sh$427.1M
COGTindirect12,503,418 sh$406.9M
VRDNindirect5,090,928 sh$114.2M
ZBIOindirect2,359,025 sh$76.2M
CBIOindirect2,294,037 sh$39.4M
JBIOindirect855,047 sh$14.2M
DMRAindirect37,313 sh$915K
JBIOdirect34,843 sh$580K

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

APGE · 87 trades
2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-09-03: Disposition, 14,461 sh2026-09-03: Disposition, 7,657 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 340,855 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 51,166 sh2026-09-03: Disposition, 6,743,321 sh2026-09-03: Disposition, 47,758 sh2026-09-03: Disposition, 10,370 sh2026-08-07: Option exercise, 31,838 sh ($541K)2026-08-07: Option exercise, 10,370 sh ($455K)2026-08-07: Option exercise, 31,838 sh ($0)2026-08-07: Option exercise, 10,370 sh ($0)2026-06-09: Award / grant, 7,657 sh ($0)2026-01-22: Sale, 1,750,000 sh ($133.5M)2025-06-17: Award / grant, 14,461 sh ($0)
ORKA · 11 trades
2026-07-01: Sale, 3,553,410 sh ($300.0M)2026-07-01: Conversion, 42,641 sh ($0)2026-07-01: Conversion, 3,553,410 sh2026-07-01: Conversion, 3,553,410 sh2026-07-01: Conversion, 3,553,410 sh2026-07-01: Conversion, 3,553,410 sh2026-07-01: Conversion, 3,553,410 sh2026-07-01: Conversion, 3,553,410 sh2026-06-02: Award / grant, 9,136 sh ($0)2025-09-17: Award / grant, 333,340 sh ($5.0M)2025-06-02: Award / grant, 17,500 sh ($0)
SYRE · 9 trades
2026-06-23: Sale, 4,684,781 sh ($399.7M)2026-06-23: Conversion, 16,667 sh ($0)2026-06-23: Conversion, 666,680 sh2026-06-23: Conversion, 666,680 sh2026-06-23: Conversion, 666,680 sh2026-06-23: Conversion, 666,680 sh2026-06-23: Conversion, 666,680 sh2026-05-27: Award / grant, 8,026 sh ($0)2025-05-29: Award / grant, 25,000 sh ($0)
CBIO · 6 trades
2026-07-16: Purchase, 853,450 sh ($12.4M)2026-07-16: Purchase, 525,897 sh ($7.6M)2026-06-02: Award / grant, 11,050 sh ($0)2025-12-04: Purchase, 1,360,000 sh ($18.2M)2025-12-04: Purchase, 131,434 sh ($1.8M)2025-06-23: Award / grant, 9,023 sh ($0)
VRDN · 6 trades
2026-05-11: Purchase, 1,176,470 sh ($20.0M)2025-10-23: Purchase, 454,545 sh ($10.0M)2025-06-10: Option exercise, 12,500 sh ($154K)2025-06-10: Option exercise, 12,500 sh ($0)2025-06-09: Option exercise, 1,600 sh ($12K)2025-06-09: Option exercise, 1,600 sh ($0)
COGT · 6 trades
2026-03-31: Sale, 7,000,000 sh ($242.6M)2026-03-31: Conversion, 28,000 sh ($0)2026-03-31: Conversion, 7,000,000 sh2026-03-31: Conversion, 7,000,000 sh2026-01-22: Sale, 3,500,000 sh ($127.4M)2025-07-10: Purchase, 2,777,777 sh ($25.0M)

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
2026-07-16CBIOPurchase853,450 @ $14.50$12.4M+31.1% of holding3,601,316Form 4
2026-07-16CBIOPurchase525,897 @ $14.50$7.6M+29.7% of holding2,294,037Form 4
2026-07-01ORKASale3,553,410 @ $84.43$300.0M−75.8% of holding1,131,954Form 4
2026-06-23SYRESale4,684,781 @ $85.31$399.7M−100.0% of holding0Form 4
2026-05-11VRDNPurchase1,176,470 @ $17.00$20.0M+30.1% of holding5,090,928Form 4
2026-03-31COGTSale7,000,000 @ $34.66$242.6M−56.0% of holding5,503,418Form 4
2026-03-31ZBIOPurchase150,000 @ $20.00$3.0M+6.8% of holding2,359,025Form 4
2026-01-22APGESale1,750,000 @ $76.30$133.5M−85.4% of holding298,647Form 4
2026-01-22COGTSale3,500,000 @ $36.40$127.4M−38.9% of holding5,503,418Form 4
2025-12-04CBIOPurchase1,360,000 @ $13.41$18.2M+98.0% of holding2,747,866Form 4
2025-12-04CBIOPurchase131,434 @ $13.41$1.8M+8.0% of holding1,768,140Form 4
2025-10-23VRDNPurchase454,545 @ $22.00$10.0M+13.1% of holding3,914,458Form 4
2025-10-07ZBIOPurchase316,219 @ $19.00$6.0M+16.7% of holding2,209,025Form 4
2025-07-10COGTPurchase2,777,777 @ $9.00$25.0M+44.6% of holding9,003,418Form 4
124 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-09-09—Award / grant48,44548,445Form 4
2026-09-03APGEDisposition47,7580Form 4
2026-09-03APGEDisposition14,4610Form 4
2026-09-03APGEDisposition7,6570Form 4
2026-09-03APGEDisposition340,8550Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition6,743,3210Form 4
2026-09-03APGEDisposition47,7580Form 4
2026-09-03APGEDisposition10,3700Form 4
2026-09-03APGEDisposition14,4610Form 4
2026-09-03APGEDisposition7,6570Form 4
2026-09-03APGEDisposition340,8550Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition6,743,3210Form 4
2026-09-03APGEDisposition47,7580Form 4
2026-09-03APGEDisposition10,3700Form 4
2026-09-03APGEDisposition14,4610Form 4
2026-09-03APGEDisposition7,6570Form 4
2026-09-03APGEDisposition10,3700Form 4
2026-09-03APGEDisposition340,8550Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition6,743,3210Form 4
2026-09-03APGEDisposition47,7580Form 4
2026-09-03APGEDisposition14,4610Form 4
2026-09-03APGEDisposition7,6570Form 4
2026-09-03APGEDisposition340,8550Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition51,1660Form 4
2026-09-03APGEDisposition6,743,3210Form 4
2026-09-03APGEDisposition340,8550Form 4
2026-09-03APGEDisposition10,3700Form 4
2026-09-03APGEDisposition14,4610Form 4
2026-09-03APGEDisposition7,6570Form 4
2026-09-03APGEDisposition47,7580Form 4
2026-09-03APGEDisposition10,3700Form 4
2026-09-03APGEDisposition14,4610Form 4
2026-09-03APGEDisposition7,6570Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.