Shannon River Fund Management LLC TSEM — TOWER SEMICONDUCTOR LTD

Ownership history in Shannon River Fund Management LLC  ·  10 quarters on record

AI Ownership Summary

Shannon River Fund Management LLC reported TOWER SEMICONDUCTOR LTD (TSEM) in 10 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 16.88% in 2026 Q1. The latest visible filing shows TSEM at 16.88% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this TSEM ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Shannon River Fund Management LLC's position in TOWER SEMICONDUCTOR LTD, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q1

TSEM was reported at 16.88% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
16.88% in 2026 Q1

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q4 to 2026 Q1

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

TSEM stock page Shannon River Fund Management LLC fund profile Shannon River Fund Management LLC full holdings
How Shannon River Fund Management LLC held TSEM — position size vs. price
% of Fund (quarterly)    TSEM price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 REDUCED — — — 504,239 -98,565 -16.4% 16.88% $88.5M 2026-05-14 $280.69
2025 Q4 REDUCED 37.3% +49.5% ❌ 602,804 -359,259 -37.3% 11.10% $70.8M 2026-02-17 $127.78
2025 Q3 REDUCED 34.4% +67.5% ❌ 962,063 -505,441 -34.4% 11.20% $69.6M 2025-11-13 $99.09
2025 Q2 ADDED — — — 1,467,504 +274,791 +23.0% 8.46% $63.6M 2025-08-13 $46.94
2025 Q1 ADDED — — — 1,192,713 +106,822 +9.8% 11.10% $42.5M 2025-05-14 $42.14
2024 Q4 REDUCED 18.9% -30.8% ✅ 1,085,891 -252,324 -18.9% 8.25% $55.9M 2025-02-13 $48.21
2024 Q3 REDUCED 32.5% +17.7% ❌ 1,338,215 -645,135 -32.5% 8.29% $59.2M 2024-11-13 $48.42
2024 Q2 ADDED — — — 1,983,350 +150,014 +8.2% 12.57% $78.0M 2024-08-13 $38.71
2024 Q1 ADDED — — — 1,833,336 +570,610 +45.2% 13.66% $61.3M 2024-05-14 $36.95
2023 Q4 INITIATED — — — 1,262,726 — — 7.04% $38.5M 2024-02-13 $28.63

🏢 Other funds also holding TSEM

As of 2026 Q1 — sorted by position size

Turiya Advisors Asia Ltd 3Y 7Y 27.1% Andar Capital Management HK Ltd 3Y 19.51% Valliance Asset Management Ltd 3Y 18.74% Senvest Management, LLC 3Y 7Y 13.23% Mivtachim The Workers Social Insurance Fund Ltd. (Under Special Management) 3Y 7Y 9.96% Yahav Achim Ve Achayot - Provident Funds Management Co Ltd. 3Y 9.08% Global IMC LLC 3Y 7Y 9.05% Y.D. More Investments Ltd 3Y 6.21% Phoenix Financial Ltd. 3Y 5.64% WT Asset Management Ltd 3Y 5.39%

FAQ About Shannon River Fund Management LLC and TSEM

These are the practical questions this page is built to answer before you even open the full history table.

How long has Shannon River Fund Management LLC reported owning TSEM?

Shannon River Fund Management LLC reported TSEM across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported TSEM position in Shannon River Fund Management LLC's portfolio?

The largest reported portfolio weight for TSEM was 16.88% in 2026 Q1.

What is the latest reported TSEM position on this page?

The most recent filing on this page is 2026 Q1, when Shannon River Fund Management LLC reported 504,239 shares, equal to 16.88% of portfolio, with an estimated market value of $88.5M.

What does the chart on this TSEM ownership page compare?

The chart compares Shannon River Fund Management LLC's quarterly TSEM portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did Shannon River Fund Management LLC time their TSEM position?

Based on 13F filing dates vs. subsequent TSEM price moves, Shannon River Fund Management LLC correctly timed 7 out of 9 reported position changes (78%). The annualised alpha on TSEM relative to SPY over the holding period was +126.8%.

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