Shannon River Fund Management LLC 13F: Quarter-over-Quarter Portfolio Changes
Shannon River Fund Management LLC reported a disclosed portfolio value of approximately $524.1 million in its latest SEC Form 13F-HR filing for Q1 2026, down 17.8% quarter on quarter. Over the quarter, the fund initiated 13 new positions, bought more shares in 7 holdings, trimmed 8 holdings, and exited 11 positions.
Shannon River Fund Management LLC's top buy was a new stake in Airbnb, INC. (ABNB) , equal to 6.0% of the disclosed portfolio. Its top sell was Pegasystems INC (PEGA) . The fund exited the position completely after it had accounted for 9.7% of the previous portfolio.
New PositionsQ1 2026
Securities disclosed for the first time in Q1 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Portfolio Weight | History |
|---|---|---|---|
| AIRBNB, INC. | ABNB | 6.0% | History → |
| RAMBUS INC DEL | RMBS | 5.5% | History → |
| TOAST INC | TOST | 3.7% | History → |
| ADTRAN HOLDINGS INC | ADTN | 2.9% | Holders → |
| F5 INC | FFIV | 2.8% | Holders → |
| LIONSGATE STUDIOS CORP | LION | 1.9% | Holders → |
| ENERGY FUELS INC | UUUU | 1.8% | Holders → |
| SPHERE ENTERTAINMENT CO | SPHR | 1.6% | Holders → |
| APPLOVIN CORP | APP | 1.1% | Holders → |
| DIGITAL RLTY TR INC | DLR | 1.0% | Holders → |
| OSI SYSTEMS INC | OSIS | 1.0% | Holders → |
| EQUINIX INC | EQIX | 1.0% | Holders → |
| SNOWFLAKE INC | SNOW | 0.8% | Holders → |
Top BuysQ1 2026
The fund's top buys among existing positions in Q1 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| AXON ENTERPRISE INC | AXON | +2.0% | +129.0% | History → |
| HINGE HEALTH INC | HNGE | +1.4% | +78.8% | Holders → |
| MARVELL TECHNOLOGY INC | MRVL | +5.6% | +49.2% | History → |
| LIVE NATION ENTERTAINMENT IN | LYV | +2.9% | +15.3% | History → |
| INTERDIGITAL INC | IDCC | +0.4% | +1.1% | Holders → |
| LEGENCE CORP | LGN | +1.4% | +0.8% | Holders → |
| PALANTIR TECHNOLOGIES INC | PLTR | +0.0% | +0.6% | Holders → |
Top SellsQ1 2026
The fund's top sells among positions it retained in Q1 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| ASTERA LABS INC | ALAB | -3.4% | 71.7% | Holders → |
| AMBARELLA INC | AMBA | -2.2% | 61.8% | Holders → |
| GUIDEWIRE SOFTWARE INC | GWRE | -2.2% | 50.1% | Holders → |
| CELESTICA INC | CLS | -2.1% | 50.1% | Holders → |
| COHERENT CORP | COHR | -0.9% | 47.7% | History → |
| EXTREME NETWORKS | EXTR | -1.2% | 31.1% | History → |
| TOWER SEMICONDUCTOR LTD | TSEM | 5.8% | 16.4% | History → |
| FLEXTRONICS INTL LTD | FLEX | 0.9% | 0.7% | History → |
Full ExitsQ1 2026
Positions present in the prior 13F-HR filing that no longer appear in Q1 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| PEGASYSTEMS INC | PEGA | 9.7% |
| UNITY SOFTWARE INC | U | 7.4% |
| CLEARWATER ANALYTICS HOLDINGS INC | CWAN | 4.7% |
| NCINO INC | NCNO | 4.6% |
| KLAVIYO INC | KVYO | 3.7% |
| CREDO TECHNOLOGY GROUP HOLDI | CRDO | 3.4% |
| DOCUSIGN INC | DOCU | 1.7% |
| CCC INTELLIGENT SOLUTIONS HL | CCC | 1.3% |
| QUALCOMM INC | QCOM | 1.2% |
| MICRON TECHNOLOGY INC | MU | 0.9% |
| WIX COM LTD | WIX | 0.8% |
Net Portfolio Value ChangeQ1 2026
- $0.6BPrior quarter
- $0.5BCurrent quarter
- $-0.1BNet delta
- -17.8%% 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 Q1 2026?
In Q1 2026, Shannon River Fund Management LLC initiated 13 new positions (AIRBNB, INC. (ABNB), RAMBUS INC DEL (RMBS), TOAST INC (TOST), ADTRAN HOLDINGS INC (ADTN), F5 INC (FFIV), LIONSGATE STUDIOS CORP (LION), ENERGY FUELS INC (UUUU), SPHERE ENTERTAINMENT CO (SPHR), APPLOVIN CORP (APP), DIGITAL RLTY TR INC (DLR), OSI SYSTEMS INC (OSIS), EQUINIX INC (EQIX), SNOWFLAKE INC (SNOW)); bought more shares of AXON ENTERPRISE INC (AXON), HINGE HEALTH INC (HNGE), MARVELL TECHNOLOGY INC (MRVL), LIVE NATION ENTERTAINMENT IN (LYV), INTERDIGITAL INC (IDCC) — the largest 5 of 7 adds.
What stocks did Shannon River Fund Management LLC sell in Q1 2026?
In Q1 2026, Shannon River Fund Management LLC fully sold 11 positions (PEGASYSTEMS INC (PEGA), UNITY SOFTWARE INC (U), CLEARWATER ANALYTICS HOLDINGS INC (CWAN), NCINO INC (NCNO), KLAVIYO INC (KVYO), CREDO TECHNOLOGY GROUP HOLDI (CRDO), DOCUSIGN INC (DOCU), CCC INTELLIGENT SOLUTIONS HL (CCC), QUALCOMM INC (QCOM), MICRON TECHNOLOGY INC (MU), WIX COM LTD (WIX)); reduced holdings in ASTERA LABS INC (ALAB), AMBARELLA INC (AMBA), GUIDEWIRE SOFTWARE INC (GWRE), CELESTICA INC (CLS), COHERENT CORP (COHR) — the largest 5 of 8 reductions.
Which positions did Shannon River Fund Management LLC initiate in Q1 2026?
Shannon River Fund Management LLC established 13 new positions in Q1 2026: AIRBNB, INC. (ABNB, 6.0%), RAMBUS INC DEL (RMBS, 5.5%), TOAST INC (TOST, 3.7%), ADTRAN HOLDINGS INC (ADTN, 2.9%), F5 INC (FFIV, 2.8%), LIONSGATE STUDIOS CORP (LION, 1.9%), ENERGY FUELS INC (UUUU, 1.8%), SPHERE ENTERTAINMENT CO (SPHR, 1.6%), APPLOVIN CORP (APP, 1.1%), DIGITAL RLTY TR INC (DLR, 1.0%), OSI SYSTEMS INC (OSIS, 1.0%), EQUINIX INC (EQIX, 1.0%), SNOWFLAKE INC (SNOW, 0.8%).
Which existing positions saw the largest allocation increases for Shannon River Fund Management LLC in Q1 2026?
Of 7 existing positions with share-count increases in Q1 2026, the largest were: AXON ENTERPRISE INC (AXON, +2.0% weight, +129.0% shares), HINGE HEALTH INC (HNGE, +1.4% weight, +78.8% shares), MARVELL TECHNOLOGY INC (MRVL, +5.6% weight, +49.2% shares), LIVE NATION ENTERTAINMENT IN (LYV, +2.9% weight, +15.3% shares), INTERDIGITAL INC (IDCC, +0.4% weight, +1.1% shares), LEGENCE CORP (LGN, +1.4% weight, +0.8% shares), PALANTIR TECHNOLOGIES INC (PLTR, +0.0% weight, +0.6% shares).
Which positions did Shannon River Fund Management LLC fully exit in Q1 2026?
Shannon River Fund Management LLC fully exited 11 positions in Q1 2026: PEGASYSTEMS INC (PEGA, last-reported weight 9.7%), UNITY SOFTWARE INC (U, last-reported weight 7.4%), CLEARWATER ANALYTICS HOLDINGS INC (CWAN, last-reported weight 4.7%), NCINO INC (NCNO, last-reported weight 4.6%), KLAVIYO INC (KVYO, last-reported weight 3.7%), CREDO TECHNOLOGY GROUP HOLDI (CRDO, last-reported weight 3.4%), DOCUSIGN INC (DOCU, last-reported weight 1.7%), CCC INTELLIGENT SOLUTIONS HL (CCC, last-reported weight 1.3%), QUALCOMM INC (QCOM, last-reported weight 1.2%), MICRON TECHNOLOGY INC (MU, last-reported weight 0.9%), WIX COM LTD (WIX, last-reported weight 0.8%).
Which existing positions saw the largest allocation reductions for Shannon River Fund Management LLC in Q1 2026?
Of 8 existing positions with share-count reductions in Q1 2026, the largest were: ASTERA LABS INC (ALAB, -3.4% weight, -71.7% shares), AMBARELLA INC (AMBA, -2.2% weight, -61.8% shares), GUIDEWIRE SOFTWARE INC (GWRE, -2.2% weight, -50.1% shares), CELESTICA INC (CLS, -2.1% weight, -50.1% shares), COHERENT CORP (COHR, -0.9% weight, -47.7% shares), EXTREME NETWORKS (EXTR, -1.2% weight, -31.1% shares), TOWER SEMICONDUCTOR LTD (TSEM, 5.8% weight, -16.4% shares), FLEXTRONICS INTL LTD (FLEX, 0.9% weight, -0.7% 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.