Shannon River Fund Management LLC 13F: Quarter-over-Quarter Portfolio Changes
Shannon River Fund Management LLC reported a disclosed portfolio value of approximately $1.1 billion in its latest SEC Form 13F-HR filing for Q2 2026, up 113.8% quarter on quarter. Over the quarter, the fund initiated 22 new positions, bought more shares in 12 holdings, trimmed 3 holdings, and exited 13 positions.
Shannon River Fund Management LLC's top buy was a new stake in Advanced Micro Devices INC (AMD) , equal to 5.5% of the disclosed portfolio. Its top sell was Marvell Technology INC (MRVL) . The fund exited the position completely after it had accounted for 10.7% of the previous portfolio.
New PositionsQ2 2026
Securities disclosed for the first time in Q2 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Portfolio Weight | History |
|---|---|---|---|
| ADVANCED MICRO DEVICES INC | AMD | 5.5% | History → |
| KULICKE & SOFFA INDS INC | KLIC | 4.0% | History → |
| TWILIO INC | TWLO | 3.7% | History → |
| CIENA CORP | CIEN | 3.6% | Holders → |
| QUANTINUUM INC | QNT | 3.4% | Holders → |
| UNIVERSAL TECHNICAL INSTITUTE INC | UTI | 3.4% | Holders → |
| TAKE-TWO INTERACTIVE SOFTWAR | TTWO | 3.1% | Holders → |
| OUSTER INC | OUST | 2.5% | Holders → |
| PDF SOLUTIONS INC | PDFS | 2.3% | Holders → |
| NOKIA CORP | NOK | 2.3% | Holders → |
| ALLIENT INC | ALNT | 2.0% | Holders → |
| ROCKET LAB CORP | RKLB | 2.0% | Holders → |
| DYCOM INDS INC | DY | 1.8% | Holders → |
| CIPHER DIGITAL INC | CIFR | 1.5% | Holders → |
| GLOBAL E ONLINE LTD | GLBE | 1.1% | Holders → |
| AMPRIUS TECHNOLOGIES INC | AMPX | 1.0% | Holders → |
| APPLIED DIGITAL CORP | APLD | 0.9% | Holders → |
| CLOUDFLARE INC | NET | 0.5% | Holders → |
| AMKOR TECHNOLOGY INC | AMKR | 0.5% | Holders → |
| MICRON TECHNOLOGY INC | MU | 0.5% | Holders → |
| BABCOCK & WILCOX ENTERPRISES | BW | 0.4% | Holders → |
| MAXLINEAR INC | MXL | 0.3% | Holders → |
Top BuysQ2 2026
Showing the top 10 buys among 12 existing positions where the fund bought more shares in Q2 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| INTERDIGITAL INC | IDCC | +1.5% | +240.8% | History → |
| DIGITAL REALTY TRUST, INC. | DLR | +0.4% | +197.5% | Holders → |
| CELESTICA INC | CLS | +1.7% | +161.6% | History → |
| GUIDEWIRE SOFTWARE | GWRE | +-0.6% | +80.1% | Holders → |
| COHERENT CORP | COHR | +0.6% | +47.1% | History → |
| HINGE HEALTH INC | HNGE | +1.1% | +34.5% | History → |
| FLEX LTD | FLEX | +1.6% | +22.0% | History → |
| EXTREME NETWORKS INC | EXTR | +0.3% | +8.5% | History → |
| F5 INC | FFIV | +-0.9% | +2.1% | Holders → |
| LIONSGATE STUDIOS CORP | LION | +-0.5% | +0.9% | Holders → |
Top SellsQ2 2026
The fund's top sells among positions it retained in Q2 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| LIVE NATION ENTERTAINMENT IN | LYV | -5.0% | 26.6% | Holders → |
| TOWER SEMICONDUCTOR LTD | TSEM | -8.0% | 24.1% | History → |
| RAMBUS INC DEL | RMBS | -2.0% | 12.6% | Holders → |
Full ExitsQ2 2026
Positions present in the prior 13F-HR filing that no longer appear in Q2 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| MARVELL TECHNOLOGY INC | MRVL | 10.7% |
| AXON ENTERPRISE INC | AXON | 3.8% |
| TOAST INC | TOST | 3.7% |
| LEGENCE CORP | LGN | 3.6% |
| ADTRAN HOLDINGS INC | ADTN | 2.9% |
| ENERGY FUELS INC | UUUU | 1.8% |
| AMBARELLA INC | AMBA | 1.1% |
| APPLOVIN CORP | APP | 1.1% |
| ASTERA LABS INC | ALAB | 1.0% |
| OSI SYSTEMS INC | OSIS | 1.0% |
| EQUINIX, INC. REIT | EQIX | 1.0% |
| PALANTIR TECHNOLOGIES INC | PLTR | 0.8% |
| SNOWFLAKE INC | SNOW | 0.8% |
Net Portfolio Value ChangeQ2 2026
- $0.5BPrior quarter
- $1.1BCurrent quarter
- +$0.6BNet delta
- +113.8%% change
Methodology & FAQ
How Shannon River Fund Management LLC Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for Shannon River Fund Management LLC: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description, including how confidential treatment filings are handled, is documented in the Methodology.
What stocks did Shannon River Fund Management LLC buy in Q2 2026?
In Q2 2026, Shannon River Fund Management LLC initiated 22 new positions (ADVANCED MICRO DEVICES INC (AMD), KULICKE & SOFFA INDS INC (KLIC), TWILIO INC (TWLO), CIENA CORP (CIEN), QUANTINUUM INC (QNT), UNIVERSAL TECHNICAL INSTITUTE INC (UTI), TAKE-TWO INTERACTIVE SOFTWAR (TTWO), OUSTER INC (OUST), PDF SOLUTIONS INC (PDFS), NOKIA CORP (NOK), ALLIENT INC (ALNT), ROCKET LAB CORP (RKLB), DYCOM INDS INC (DY), CIPHER DIGITAL INC (CIFR), GLOBAL E ONLINE LTD (GLBE), AMPRIUS TECHNOLOGIES INC (AMPX), APPLIED DIGITAL CORP (APLD), CLOUDFLARE INC (NET), AMKOR TECHNOLOGY INC (AMKR), MICRON TECHNOLOGY INC (MU), BABCOCK & WILCOX ENTERPRISES (BW), MAXLINEAR INC (MXL)); bought more shares of INTERDIGITAL INC (IDCC), DIGITAL REALTY TRUST, INC. (DLR), CELESTICA INC (CLS), GUIDEWIRE SOFTWARE (GWRE), COHERENT CORP (COHR) (the largest 5 of 12 adds).
What stocks did Shannon River Fund Management LLC sell in Q2 2026?
In Q2 2026, Shannon River Fund Management LLC fully sold 13 positions (MARVELL TECHNOLOGY INC (MRVL), AXON ENTERPRISE INC (AXON), TOAST INC (TOST), LEGENCE CORP (LGN), ADTRAN HOLDINGS INC (ADTN), ENERGY FUELS INC (UUUU), AMBARELLA INC (AMBA), APPLOVIN CORP (APP), ASTERA LABS INC (ALAB), OSI SYSTEMS INC (OSIS), EQUINIX, INC. REIT (EQIX), PALANTIR TECHNOLOGIES INC (PLTR), SNOWFLAKE INC (SNOW)); reduced holdings in LIVE NATION ENTERTAINMENT IN (LYV), TOWER SEMICONDUCTOR LTD (TSEM), RAMBUS INC DEL (RMBS).
Which positions did Shannon River Fund Management LLC initiate in Q2 2026?
Shannon River Fund Management LLC established 22 new positions in Q2 2026: ADVANCED MICRO DEVICES INC (AMD, 5.5%), KULICKE & SOFFA INDS INC (KLIC, 4.0%), TWILIO INC (TWLO, 3.7%), CIENA CORP (CIEN, 3.6%), QUANTINUUM INC (QNT, 3.4%), UNIVERSAL TECHNICAL INSTITUTE INC (UTI, 3.4%), TAKE-TWO INTERACTIVE SOFTWAR (TTWO, 3.1%), OUSTER INC (OUST, 2.5%), PDF SOLUTIONS INC (PDFS, 2.3%), NOKIA CORP (NOK, 2.3%), ALLIENT INC (ALNT, 2.0%), ROCKET LAB CORP (RKLB, 2.0%), DYCOM INDS INC (DY, 1.8%), CIPHER DIGITAL INC (CIFR, 1.5%), GLOBAL E ONLINE LTD (GLBE, 1.1%), AMPRIUS TECHNOLOGIES INC (AMPX, 1.0%), APPLIED DIGITAL CORP (APLD, 0.9%), CLOUDFLARE INC (NET, 0.5%), AMKOR TECHNOLOGY INC (AMKR, 0.5%), MICRON TECHNOLOGY INC (MU, 0.5%), BABCOCK & WILCOX ENTERPRISES (BW, 0.4%), MAXLINEAR INC (MXL, 0.3%).
Which existing positions saw the largest allocation increases for Shannon River Fund Management LLC in Q2 2026?
Of 12 existing positions with share-count increases in Q2 2026, the largest were: INTERDIGITAL INC (IDCC, +1.5% weight, +240.8% shares), DIGITAL REALTY TRUST, INC. (DLR, +0.4% weight, +197.5% shares), CELESTICA INC (CLS, +1.7% weight, +161.6% shares), GUIDEWIRE SOFTWARE (GWRE, +-0.6% weight, +80.1% shares), COHERENT CORP (COHR, +0.6% weight, +47.1% shares), HINGE HEALTH INC (HNGE, +1.1% weight, +34.5% shares), FLEX LTD (FLEX, +1.6% weight, +22.0% shares), EXTREME NETWORKS INC (EXTR, +0.3% weight, +8.5% shares), F5 INC (FFIV, +-0.9% weight, +2.1% shares), LIONSGATE STUDIOS CORP (LION, +-0.5% weight, +0.9% shares).
Which positions did Shannon River Fund Management LLC fully exit in Q2 2026?
Shannon River Fund Management LLC fully exited 13 positions in Q2 2026: MARVELL TECHNOLOGY INC (MRVL, last-reported weight 10.7%), AXON ENTERPRISE INC (AXON, last-reported weight 3.8%), TOAST INC (TOST, last-reported weight 3.7%), LEGENCE CORP (LGN, last-reported weight 3.6%), ADTRAN HOLDINGS INC (ADTN, last-reported weight 2.9%), ENERGY FUELS INC (UUUU, last-reported weight 1.8%), AMBARELLA INC (AMBA, last-reported weight 1.1%), APPLOVIN CORP (APP, last-reported weight 1.1%), ASTERA LABS INC (ALAB, last-reported weight 1.0%), OSI SYSTEMS INC (OSIS, last-reported weight 1.0%), EQUINIX, INC. REIT (EQIX, last-reported weight 1.0%), PALANTIR TECHNOLOGIES INC (PLTR, last-reported weight 0.8%), SNOWFLAKE INC (SNOW, last-reported weight 0.8%).
Which existing positions saw the largest allocation reductions for Shannon River Fund Management LLC in Q2 2026?
Of 3 existing positions with share-count reductions in Q2 2026, the largest were: LIVE NATION ENTERTAINMENT IN (LYV, -5.0% weight, -26.6% shares), TOWER SEMICONDUCTOR LTD (TSEM, -8.0% weight, -24.1% shares), RAMBUS INC DEL (RMBS, -2.0% weight, -12.6% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.