Shannon River Fund Management LLC: INTERDIGITAL INC (IDCC): Quarterly 13F Position History
As of Q2 2026, Shannon River Fund Management LLC reported 184,388 shares of INTERDIGITAL INC (IDCC), worth $52.2M and representing 4.7% of its 13F equity book. Quarter-over-quarter share count change: + 130,284 (+240.8%) . The position first appeared in Q2 2016 and has been disclosed across 41 13F-HR filings in Pactolio's tracked window.
- 184,388Shares Held (Latest Filing)
- $52.2MReported Market Value (Latest Filing)
- 4.7%Portfolio Weight (% of 13F Equity Book)
- +130,284Quarter-over-Quarter Share Change
- +$35.9MQuarter-over-Quarter Value Change
- 1,313,863Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 41 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q2 2026 | 184,388 | +130,284 | +240.8% | $52.2M | 4.7% | $283.1 |
| Q1 2026 | 54,104 | +614 | +1.1% | $16.3M | 3.1% | $302.0 |
| Q4 2025 | 53,490 | 125,230 | -70.1% | $17.0M | 2.7% | $318.4 |
| Q3 2025 | 178,720 | 57,851 | -24.5% | $61.7M | 9.9% | $345.2 |
| Q2 2025 | 236,571 | +11,569 | +5.1% | $53.0M | 8.2% | $224.2 |
| Q1 2025 | 225,002 | 156,643 | -41.0% | $46.5M | 12.1% | $206.8 |
| Q4 2024 | 381,645 | 90,507 | -19.2% | $73.9M | 13.1% | $193.7 |
| Q3 2024 | 472,152 | +28,693 | +6.5% | $66.9M | 10.1% | $141.6 |
| Q2 2024 | 443,459 | +74,650 | +20.2% | $51.7M | 8.9% | $116.6 |
| Q1 2024 | 368,809 | 103,998 | -22.0% | $39.3M | 8.7% | $106.5 |
| Q4 2023 | 472,807 | 169,458 | -26.4% | $51.3M | 14.2% | $108.5 |
| Q3 2023 | 642,265 | +23,815 | +3.9% | $51.5M | 15.2% | $80.2 |
| Q2 2023 | 618,450 | 24,188 | -3.8% | $59.7M | 14.9% | $96.5 |
| Q1 2023 | 642,638 | +150,890 | +30.7% | $46.8M | 10.6% | $72.9 |
| Q4 2022 | 491,748 | +491,748 | – | $24.3M | 7.7% | $49.5 |
| Q3 2022 | 0 | 298,531 | -100.0% | $0 | 0.0% | – |
| Q2 2022 | 298,531 | 177,358 | -37.3% | $18.2M | 5.2% | $60.8 |
| Q1 2022 | 475,889 | 213,669 | -31.0% | $30.4M | 3.8% | $63.8 |
| Q4 2021 | 689,558 | 16,531 | -2.3% | $49.4M | 5.0% | $71.6 |
| Q3 2021 | 706,089 | +706,089 | – | $47.9M | 4.2% | $67.8 |
| Q2 2021 | 0 | 1,198,674 | -100.0% | $0 | 0.0% | – |
| Q1 2021 | 1,198,674 | 44,918 | -3.6% | $76.1M | 6.9% | $63.5 |
| Q4 2020 | 1,243,592 | 44,954 | -3.5% | $75.5M | 7.4% | $60.7 |
| Q3 2020 | 1,288,546 | 25,317 | -1.9% | $73.5M | 8.8% | $57.1 |
| Q2 2020 | 1,313,863 | +103,467 | +8.5% | $74.4M | 10.2% | $56.6 |
| Q1 2020 | 1,210,396 | +210,773 | +21.1% | $54.0M | 12.1% | $44.6 |
| Q4 2019 | 999,623 | +999,623 | – | $54.5M | 9.3% | $54.5 |
| Q3 2019 | 0 | 0 | – | $0 | 0.0% | – |
| Q2 2019 | 0 | 0 | – | $0 | 0.0% | – |
| Q1 2019 | 0 | 0 | – | $0 | 0.0% | – |
| Q4 2018 | 0 | 0 | – | $0 | 0.0% | – |
| Q3 2018 | 0 | 0 | – | $0 | 0.0% | – |
| Q2 2018 | 0 | 0 | – | $0 | 0.0% | – |
| Q1 2018 | 0 | 0 | – | $0 | 0.0% | – |
| Q4 2017 | 0 | 0 | – | $0 | 0.0% | – |
| Q3 2017 | 0 | 0 | – | $0 | 0.0% | – |
| Q2 2017 | 0 | 0 | – | $0 | 0.0% | – |
| Q1 2017 | 0 | 0 | – | $0 | 0.0% | – |
| Q4 2016 | 0 | 0 | – | $0 | 0.0% | – |
| Q3 2016 | 0 | 150,000 | -100.0% | $0 | 0.0% | – |
| Q2 2016 | 150,000 | – | – | $8.4M | 2.1% | $55.7 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares, a quarter-end mark rather than the manager's cost basis. See the full methodology document for the normalization rules.
When did Shannon River Fund Management LLC first disclose a IDCC position in 13F-HR filings?
Shannon River Fund Management LLC first reported INTERDIGITAL INC (IDCC) on its 13F-HR filing for the period ending 2016-06-30 (Q2 2016). The position has appeared on 41 reported quarters within Pactolio's tracked window.
What was Shannon River Fund Management LLC's most recent quarter-over-quarter share-count change in IDCC?
Between Q1 2026 and Q2 2026, Shannon River Fund Management LLC added 130,284 shares of IDCC (+240.8%), bringing the total reported position to 184,388 shares at a market value of $52.2M.
Does the implied price-per-share represent Shannon River Fund Management LLC's cost basis in IDCC?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.