Altimmune, Inc.
US ˙ NasdaqGM ˙ US02155H2004

SecurityALT / Altimmune, Inc.
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership134,085 shares
Latest Disclosed Value $ 518,908
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series reports 9.40% increase in ownership of ALT / Altimmune, Inc.

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 134,085 shares of Altimmune, Inc. (US:ALT) valued at $518,909 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 122,559 shares of Altimmune, Inc.. This represents a change in shares of 9.40% during the quarter. The current value of the position is $363,370 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2025-08-26 2025-06-30 NP Altimmune EC US02155H2004 134,085 11,526 9.40 519 -15.36 0.0117
2025-05-28 2025-03-31 NP Altimmune EC US02155H2004 122,559 0 0.00 613 -30.69 0.0147
2025-02-25 2024-12-31 NP Altimmune EC US02155H2004 122,559 -19,058 -13.46 884 1.61 0.0193
2024-11-26 2024-09-30 NP Altimmune EC US02155H2004 141,617 41,162 40.98 870 30.09 0.0164
2024-08-26 2024-06-30 NP Altimmune EC US02155H2004 100,455 16,489 19.64 668 -21.78 0.0136
2024-05-28 2024-03-31 NP Altimmune EC US02155H2004 83,966 0 0.00 855 -9.53 0.0178
2024-02-26 2023-12-31 NP Altimmune EC US02155H2004 83,966 0 0.00 945 333.03 0.0202
2023-11-28 2023-09-30 NP Altimmune EC US02155H2004 83,966 0 0.00 218 -26.35 0.0057
2023-08-25 2023-06-30 NP Altimmune EC US02155H2004 83,966 22,537 36.69 296 -20.86 0.0070
2022-05-26 2022-03-31 NP Altimmune EC US02155H2004 61,429 0 0.00 374 -33.45 0.0087
2022-02-25 2021-12-31 NP Altimmune EC US02155H2004 61,429 0 0.00 563 -19.02 0.0122
2021-11-24 2021-09-30 NP Altimmune EC US02155H2004 61,429 12,507 25.57 695 44.28 0.0153
2021-08-26 2021-06-30 NP Altimmune EC US02155H2004 48,922 48,922 482 0.0103
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.