SPHERA FUNDS MANAGEMENT LTD. TSEM — TOWER SEMICONDUCTOR LTD

Ownership history in SPHERA FUNDS MANAGEMENT LTD.  ·  15 quarters on record

AI Ownership Summary

SPHERA FUNDS MANAGEMENT LTD. reported TOWER SEMICONDUCTOR LTD (TSEM) in 15 quarterly 13F filings from 2023 Q4 through 2025 Q4. Peak portfolio weight reached 4.76% in 2025 Q3. The latest visible filing shows TSEM at 2.78% 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. Older history is available after unlock; the visible window still shows the most recent pattern.

What this TSEM ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was SPHERA FUNDS MANAGEMENT LTD.'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
2025 Q4

TSEM was reported at 2.78% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
4.76% in 2025 Q3

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 2025 Q4

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 SPHERA FUNDS MANAGEMENT LTD. fund profile SPHERA FUNDS MANAGEMENT LTD. full holdings
How SPHERA FUNDS MANAGEMENT LTD. 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 9 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED 60.7% +49.5% ❌ 122,513 -189,289 -60.7% 2.78% $14.4M 2026-02-14 (Est.) $128.74
2025 Q3 ADDED — — — 311,802 +47,080 +17.8% 4.76% $22.5M 2025-11-14 $99.26
2025 Q2 ADDED — — — 264,722 +203,173 +330.1% 2.69% $11.5M 2025-08-14 $47.24
2025 Q1 REDUCED 63.0% +21.6% ❌ 61,549 -104,600 -63.0% 0.51% $2.2M 2025-05-15 $42.06
2024 Q4 REDUCED 20.7% -30.8% ✅ 166,149 -43,292 -20.7% 1.55% $8.6M 2025-02-14 $47.63
2024 Q3 ADDED — — — 209,441 +59,841 +40.0% 1.48% $9.3M 2024-11-14 $46.30
2024 Q2 REDUCED 16.7% +12.6% ❌ 149,600 -30,000 -16.7% 0.80% $5.9M 2024-08-14 $38.98
2024 Q1 REDUCED 66.0% +18.6% ❌ 179,600 -348,700 -66.0% 0.84% $6.0M 2024-05-15 $36.75
2023 Q4 ADDED — — — 528,300 +58,726 +12.5% 2.59% $16.1M 2024-02-14 $31.88
6 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding TSEM

As of 2026 Q1 — sorted by position size

GF FUND MANAGEMENT CO. LTD. 3.36% Rockingstone Advisors LLC 2.68% USS Investment Management Ltd 3Y 7Y 2.24% Gunderson Capital Management LLC 3Y 1.92% E Fund Management Co., Ltd. 3Y 1.81% AdviceOne Advisory Services, LLC 0.21% E Fund Management (Hong Kong) Co., Ltd. 3Y 0.19% SEVEN MILE ADVISORY 0.17% GHP Investment Advisors, Inc. 3Y 7Y 0.16% Silverleafe Capital Partners, LLC 3Y 7Y 0.14%

FAQ About SPHERA FUNDS MANAGEMENT LTD. and TSEM

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

How long has SPHERA FUNDS MANAGEMENT LTD. reported owning TSEM?

SPHERA FUNDS MANAGEMENT LTD. reported TSEM across 9 quarterly 13F filings, from 2023 Q4 through 2025 Q4.

What was the largest reported TSEM position in SPHERA FUNDS MANAGEMENT LTD.'s portfolio?

The largest reported portfolio weight for TSEM was 4.76% in 2025 Q3.

What is the latest reported TSEM position on this page?

The most recent filing on this page is 2025 Q4, when SPHERA FUNDS MANAGEMENT LTD. reported 122,513 shares, equal to 2.78% of portfolio, with an estimated market value of $14.4M.

What does the chart on this TSEM ownership page compare?

The chart compares SPHERA FUNDS MANAGEMENT LTD.'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 SPHERA FUNDS MANAGEMENT LTD. time their TSEM position?

Based on 13F filing dates vs. subsequent TSEM price moves, SPHERA FUNDS MANAGEMENT LTD. correctly timed 7 out of 13 reported position changes (54%). The annualised alpha on TSEM relative to SPY over the holding period was +20.5%.

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