MERCK & CO. INC. · CUSIP 58933Y105 · CIK 1145020
As of 2026-06-30, THORNBURG INVESTMENT MANAGEMENT INC reported 3.79M MRK (shares), valued at $486.75M, or 4.66% of its reported non-derivative portfolio. Filed 2026-08-13.
Verify history & sources →Shares increased 1.59%; reported value increased 8.52%, and weight changed +0.00 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds.
Left: % · Right: Shares · Independently scaled axes
Exact data and methodology
Axes scale independently; a crossing does not mean equal values. Weight uses each quarter's total reported non-derivative value. Same CUSIP; missing quarters are gaps, not zero. Revised history may include later disclosures.
| Quarter | Weight | Quantity | Source |
|---|---|---|---|
| Q2 2026 | 4.66% | 3,787,976 | SEC filing ↗Filed Aug 13, 2026 |
| Q1 2026 | 4.66% | 3,728,673 | SEC filing ↗Filed May 12, 2026 |
| Q4 2025 | 4.95% | 3,728,673 | SEC filing ↗Filed Feb 13, 2026 |
| Q3 2025 | 3.85% | 3,520,631 | SEC filing ↗Filed Nov 12, 2025 |
| Q2 2025 | 4.82% | 4,729,641 | SEC filing ↗Filed Aug 13, 2025 |
| Q1 2025 | 0.58% | 3,086,806 | SEC filing ↗Filed May 8, 2025 |
| Q4 2024 | 2.47% | 1,876,384 | SEC filing ↗Filed Feb 14, 2025 |
| Q3 2024 | 2.77% | 1,876,384 | SEC filing ↗Filed Nov 12, 2024 |
| Q2 2024 | 3.26% | 1,871,244 | SEC filing ↗Filed Aug 8, 2024 |
| Q1 2024 | 3.44% | 1,871,244 | SEC filing ↗Filed May 13, 2024 |
| Q4 2023 | 3.17% | 2,015,581 | SEC filing ↗Filed Feb 8, 2024 |
| Q3 2023 | 3.41% | 2,016,111 | SEC filing ↗Filed Nov 13, 2023 |
History & evidence by quarter
| Quarter | Weight | Quantity | Value | Change explained | Source |
|---|---|---|---|---|---|
| Q3 2023 | 3.41% | 2,016,111 | $207.56M | The prior quarter is outside the free window. Sign in for the comparison. | SEC filing ↗ Filed Nov 13, 2023 |
| Q4 2023 | 3.17% | 2,015,581 | $219.74M | Shares decreased 0.03%; reported value increased 5.87%, and weight changed -0.24 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 8, 2024 |
| Q1 2024 | 3.44% | 1,871,244 | $246.91M | Shares decreased 7.16%; reported value increased 12.37%, and weight changed +0.27 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 13, 2024 |
| Q2 2024 | 3.26% | 1,871,244 | $231.66M | Shares unchanged; reported value decreased 6.18%, and weight changed -0.18 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 8, 2024 |
| Q3 2024 | 2.77% | 1,876,384 | $213.08M | Shares increased 0.27%; reported value decreased 8.02%, and weight changed -0.49 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Nov 12, 2024 |
| Q4 2024 | 2.47% | 1,876,384 | $186.66M | Shares unchanged; reported value decreased 12.40%, and weight changed -0.30 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 14, 2025 |
| Q1 2025 | 0.58% | 3,086,806 | $277.07M | Shares increased 64.51%; reported value increased 48.43%, and weight changed -1.89 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 8, 2025 |
| Q2 2025 | 4.82% | 4,729,641 | $374.40M | Shares increased 53.22%; reported value increased 35.13%, and weight changed +4.24 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 13, 2025 |
| Q3 2025 | 3.85% | 3,520,631 | $295.49M | Shares decreased 25.56%; reported value decreased 21.08%, and weight changed -0.97 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Nov 12, 2025 |
| Q4 2025 | 4.95% | 3,728,673 | $392.48M | Shares increased 5.91%; reported value increased 32.83%, and weight changed +1.10 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 13, 2026 |
| Q1 2026 | 4.66% | 3,728,673 | $448.52M | Shares unchanged; reported value increased 14.28%, and weight changed -0.29 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 12, 2026 |
| Q2 2026 | 4.66% | 3,787,976 | $486.75M | Shares increased 1.59%; reported value increased 8.52%, and weight changed +0.00 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 13, 2026 |
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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.