SBI Securities Co., Ltd. SPRO β€” Spero Therapeutics Inc

Ownership history in SBI Securities Co., Ltd.  Β·  6 quarters on record

AI Ownership Summary

SBI Securities Co., Ltd. reported Spero Therapeutics Inc (SPRO) in 6 quarterly 13F filings from 2024 Q4 through 2026 Q1. The latest visible filing shows SPRO 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.

What this SPRO ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was SBI Securities Co., Ltd.'s position in Spero Therapeutics 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

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

High-water mark
Peak Conviction
0.0% in 2024 Q4

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

Time in book
Holding Window
2024 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.

SPRO stock page SBI Securities Co., Ltd. fund profile SBI Securities Co., Ltd. full holdings
How SBI Securities Co., Ltd. held SPRO β€” position size vs. price
% of Fund (quarterly)    SPRO price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
πŸ“‹ Quarterly Holdings History 6 quarters  β–Ύ
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 UNCHANGED β€” β€” β€” 9 β€” 0% 0.00% $21 2026-04-28 $2.67
2025 Q4 REDUCED 10.0% +0.4% ❌ 9 -1 -10.0% 0.00% $21 2026-02-03 $2.14
2025 Q3 REDUCED 83.9% +22.3% ❌ 10 -52 -83.9% 0.00% $19 2025-11-05 $2.43
2025 Q2 ADDED β€” β€” β€” 62 +2 +3.3% 0.00% $180 2025-08-08 $2.19
2025 Q1 REDUCED 71.8% +302.8% ❌ 60 -153 -71.8% 0.00% $43 2025-05-02 $0.65
2024 Q4 INITIATED β€” β€” β€” 213 β€” β€” 0.00% $219 2025-02-06 $0.86

🏒 Other funds also holding SPRO

As of 2026 Q1 β€” sorted by position size

Torrey Growth & Income Advisors 0.02% FNY Investment Advisers, LLC 3Y 7Y 0.01% Capital Asset Advisory Services LLC 3Y 7Y 0.0% Assenagon Asset Management S.A. 3Y 7Y 0.0% Farther Finance Advisors, LLC 0.0%

FAQ About SBI Securities Co., Ltd. and SPRO

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

How long has SBI Securities Co., Ltd. reported owning SPRO?

SBI Securities Co., Ltd. reported SPRO across 6 quarterly 13F filings, from 2024 Q4 through 2026 Q1.

What was the largest reported SPRO position in SBI Securities Co., Ltd.'s portfolio?

The largest reported portfolio weight for SPRO was 0.00% in 2024 Q4.

What is the latest reported SPRO position on this page?

The most recent filing on this page is 2026 Q1, when SBI Securities Co., Ltd. reported 9 shares, equal to 0.00% of portfolio, with an estimated market value of $21.

What does the chart on this SPRO ownership page compare?

The chart compares SBI Securities Co., Ltd.'s quarterly SPRO 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 SBI Securities Co., Ltd. time their SPRO position?

Based on 13F filing dates vs. subsequent SPRO price moves, SBI Securities Co., Ltd. correctly timed 2 out of 5 reported position changes (40%). The annualised alpha on SPRO relative to SPY over the holding period was +119.2%.

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