Shannon River Fund Management LLC — 13F Holdings & Portfolio
CIK 1301050 · latest 13F-HR filed 2026-08-13
Shannon River Fund Management LLC manages $1.12B in 13F-reported U.S. long-equity assets across 37 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are TSEM (8.91%), FLEX (5.49%), AMD (5.48%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 22 new positions, exited 13, added to 14, and trimmed 1.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
13TH FLOOR
NEW YORK, NY 10022
$1.12B
Long-equity book
37
Distinct positions
2026-06-30
Filed 2026-08-13
+22 / −13 / ↑14 / ↓1
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- FLEX LTD$41.2M +202.2%
- CELESTICA INC$36.0M +238.8%
- INTERDIGITAL INC$35.9M +219.5%
- HINGE HEALTH INC$30.5M +189.6%
- COHERENT CORP$30.1M +143.5%
New Positions
- ADVANCED MICRO DEVICES INC$61.4M
- KULICKE & SOFFA INDS INC$44.8M
- TWILIO INC$41.5M
- CIENA CORP$39.9M
- QUANTINUUM INC$38.4M
Exited Positions
- MARVELL TECHNOLOGY INC$55.8M
- AXON ENTERPRISE INC$20.1M
- TOAST INC$19.4M
- LEGENCE CORP$19.1M
- ADTRAN HOLDINGS INC$15.3M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | TOWER SEMICONDUCTOR LTD | TSEM | M87915274 | $99.8M | 8.91% | 382,933 | SH |
| 2 | FLEX LTD | FLEX | Y2573F102 | $61.6M | 5.49% | 379,834 | SH |
| 3 | ADVANCED MICRO DEVICES INC | AMD | 007903107 | $61.4M | 5.48% | 105,751 | SH |
| 4 | INTERDIGITAL INC | IDCC | 45867G101 | $52.2M | 4.66% | 184,388 | SH |
| 5 | CELESTICA INC | CLS | 15101Q207 | $51.1M | 4.56% | 139,964 | SH |
| 6 | COHERENT CORP | COHR | 19247G107 | $51.0M | 4.55% | 129,283 | SH |
| 7 | HINGE HEALTH INC | HNGE | 433313103 | $46.6M | 4.16% | 561,224 | SH |
| 8 | EXTREME NETWORKS INC | EXTR | 30226D106 | $46.1M | 4.11% | 1,424,095 | SH |
| 9 | KULICKE & SOFFA INDS INC | KLIC | 501242101 | $44.8M | 4.00% | 334,781 | SH |
| 10 | TWILIO INC | TWLO | 90138F102 | $41.5M | 3.71% | 201,352 | SH |
| 11 | CIENA CORP | CIEN | 171779309 | $39.9M | 3.56% | 81,298 | SH |
| 12 | LIVE NATION ENTERTAINMENT IN | LYV | 538034109 | $39.6M | 3.53% | 216,037 | SH |
| 13 | RAMBUS INC DEL | RMBS | 750917106 | $38.7M | 3.46% | 291,713 | SH |
| 14 | QUANTINUUM INC | QNT | 74768A104 | $38.4M | 3.42% | 469,355 | SH |
| 15 | UNIVERSAL TECHNICAL INST INC | UTI | 913915104 | $38.1M | 3.40% | 890,113 | SH |
| 16 | AIRBNB INC | ABNB | 009066101 | $35.5M | 3.17% | 247,836 | SH |
| 17 | TAKE-TWO INTERACTIVE SOFTWAR | TTWO | 874054109 | $34.5M | 3.08% | 138,029 | SH |
| 18 | OUSTER INC | OUST | 68989M202 | $28.1M | 2.51% | 449,264 | SH |
| 19 | PDF SOLUTIONS INC | PDFS | 693282105 | $26.2M | 2.34% | 369,776 | SH |
| 20 | NOKIA CORP | NOK | 654902204 | $25.3M | 2.26% | 1,906,902 | SH |
| 21 | ALLIENT INC | ALNT | 019330109 | $22.7M | 2.02% | 220,237 | SH |
| 22 | ROCKET LAB CORP | RKLB | 773121108 | $22.5M | 2.01% | 221,143 | SH |
| 23 | F5 INC | FFIV | 315616102 | $21.3M | 1.90% | 51,258 | SH |
| 24 | DYCOM INDS INC | DY | 267475101 | $20.0M | 1.78% | 39,473 | SH |
| 25 | CIPHER DIGITAL INC | CIFR | 17253J106 | $16.4M | 1.46% | 667,931 | SH |
| 26 | LIONSGATE STUDIOS CORP | LION | 53626N102 | $16.1M | 1.44% | 1,050,445 | SH |
| 27 | DIGITAL RLTY TR INC | DLR | 253868103 | $15.9M | 1.42% | 88,764 | SH |
| 28 | GUIDEWIRE SOFTWARE INC | GWRE | 40171V100 | $13.9M | 1.24% | 113,230 | SH |
| 29 | SPHERE ENTERTAINMENT CO | SPHR | 55826T102 | $12.8M | 1.14% | 73,878 | SH |
| 30 | GLOBAL-E ONLINE LTD | GLBE | M5216V106 | $12.3M | 1.09% | 353,200 | SH |
| 31 | AMPRIUS TECHNOLOGIES INC | AMPX | 03214Q108 | $11.6M | 1.04% | 838,887 | SH |
| 32 | APPLIED DIGITAL CORP | APLD | 038169207 | $9.9M | 0.88% | 265,474 | SH |
| 33 | CLOUDFLARE INC | NET | 18915M107 | $5.8M | 0.52% | 23,589 | SH |
| 34 | AMKOR TECHNOLOGY INC | AMKR | 031652100 | $5.7M | 0.51% | 65,895 | SH |
| 35 | MICRON TECHNOLOGY INC | MU | 595112103 | $5.2M | 0.46% | 4,484 | SH |
| 36 | BABCOCK & WILCOX ENTERPRISES | BW | 05614L209 | $4.7M | 0.42% | 333,153 | SH |
| 37 | MAXLINEAR INC | MXL | 57776J100 | $3.5M | 0.31% | 27,377 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-13 | $1.12B | 37 | 0001013594-26-000886 |
| 2026-03-31 | 2026-05-14 | $524.1M | 28 | 0001013594-26-000581 |
| 2025-12-31 | 2026-02-17 | $637.5M | 26 | 0001013594-26-000239 |
| 2025-09-30 | 2025-11-13 | $621.2M | 20 | 0001013594-25-001398 |