DIMENSIONAL FUND ADVISORS LP ATNM — ACTINIUM PHARMACEUTICALS INC

Ownership history in DIMENSIONAL FUND ADVISORS LP  ·  19 quarters on record

AI Ownership Summary

DIMENSIONAL FUND ADVISORS LP reported ACTINIUM PHARMACEUTICALS INC (ATNM) in 19 quarterly 13F filings from 2023 Q4 through 2026 Q1. The latest visible filing shows ATNM at 0.00% 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 ATNM ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was DIMENSIONAL FUND ADVISORS LP's position in ACTINIUM PHARMACEUTICALS INC, 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

ATNM was reported at 0.00% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.0% in 2024 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.

ATNM stock page DIMENSIONAL FUND ADVISORS LP fund profile DIMENSIONAL FUND ADVISORS LP full holdings
How DIMENSIONAL FUND ADVISORS LP held ATNM — position size vs. price
% of Fund (quarterly)    ATNM 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 UNCHANGED — — — 34,923 — 0% 0.00% $35K 2026-05-07 $1.22
2025 Q4 UNCHANGED — — — 34,923 — 0% 0.00% $47K 2026-02-12 $1.11
2025 Q3 UNCHANGED — — — 34,923 — 0% 0.00% $56K 2025-11-12 $1.30
2025 Q2 UNCHANGED — — — 34,923 — 0% 0.00% $49K 2025-08-12 $1.51
2025 Q1 UNCHANGED — — — 34,923 — 0% 0.00% $56K 2025-05-13 $1.52
2024 Q4 REDUCED 31.9% +27.8% ❌ 34,923 -16,361 -31.9% 0.00% $44K 2025-02-13 $1.10
2024 Q3 REDUCED 54.2% -37.8% ✅ 51,284 -60,585 -54.2% 0.00% $96K 2024-11-07 $1.83
2024 Q2 REDUCED 22.6% -74.6% ✅ 111,869 -32,596 -22.6% 0.00% $828K 2024-08-09 $2.05
2024 Q1 REDUCED — — — 144,465 -2,972 -2.0% 0.00% $1.1M 2024-05-10 $8.73
2023 Q4 REDUCED 9.4% +68.5% ❌ 147,437 -15,332 -9.4% 0.00% $749K 2024-02-07 $5.10
9 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding ATNM

As of 2026 Q1 — sorted by position size

GAGNON SECURITIES LLC 3Y 7Y 0.05% Gen-Wealth Partners Inc 0.03% Gerald Baker Financial Group LLC 0.01% AM INVESTMENT STRATEGIES LLC 3Y 0.01% MAYPORT, LLC 3Y 0.0% NORTH STAR ASSET MANAGEMENT INC 3Y 7Y 0.0% Vontobel Holding Ltd. 3Y 0.0% Investors Research Corp 3Y 7Y 0.0% VANGUARD FIDUCIARY TRUST CO 0.0% VANGUARD CAPITAL MANAGEMENT LLC 0.0%

FAQ About DIMENSIONAL FUND ADVISORS LP and ATNM

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

How long has DIMENSIONAL FUND ADVISORS LP reported owning ATNM?

DIMENSIONAL FUND ADVISORS LP reported ATNM across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported ATNM position in DIMENSIONAL FUND ADVISORS LP's portfolio?

The largest reported portfolio weight for ATNM was 0.00% in 2024 Q1.

What is the latest reported ATNM position on this page?

The most recent filing on this page is 2026 Q1, when DIMENSIONAL FUND ADVISORS LP reported 34,923 shares, equal to 0.00% of portfolio, with an estimated market value of $35K.

What does the chart on this ATNM ownership page compare?

The chart compares DIMENSIONAL FUND ADVISORS LP's quarterly ATNM 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 DIMENSIONAL FUND ADVISORS LP time their ATNM position?

Based on 13F filing dates vs. subsequent ATNM price moves, DIMENSIONAL FUND ADVISORS LP correctly timed 7 out of 13 reported position changes (54%). The annualised alpha on ATNM relative to SPY over the holding period was -41.3%.

← Back to DIMENSIONAL FUND ADVISORS LP Holdings