Mainstream Capital Management LLC BXP — BXP INC COM

Ownership history in Mainstream Capital Management LLC  ·  6 quarters on record

AI Ownership Summary

Mainstream Capital Management LLC reported BXP INC COM (BXP) in 6 quarterly 13F filings from 2024 Q3 through 2025 Q4. Peak portfolio weight reached 0.98% in 2024 Q3. The latest visible filing shows BXP at 0.55% 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 BXP ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Mainstream Capital Management LLC's position in BXP INC COM, 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

BXP was reported at 0.55% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.98% in 2024 Q3

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

Time in book
Holding Window
2024 Q3 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.

BXP stock page Mainstream Capital Management LLC fund profile Mainstream Capital Management LLC full holdings
How Mainstream Capital Management LLC held BXP — position size vs. price
% of Fund (quarterly)    BXP price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 6 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q4 REDUCED 7.0% -22.0% ✅ 12,418 -938 -7.0% 0.55% $838K 2026-01-21 $65.04
2025 Q3 REDUCED — — — 13,356 -314 -2.3% 0.66% $993K 2025-10-20 $69.01
2025 Q2 UNCHANGED — — — 13,670 — 0% 0.67% $922K 2025-07-15 $67.64
2025 Q1 REDUCED 5.4% +1.9% ❌ 13,670 -781 -5.4% 0.73% $918K 2025-04-28 $63.17
2024 Q4 ADDED — — — 14,451 +130 +0.9% 0.75% $1.1M 2025-02-06 $68.03
2024 Q3 INITIATED — — — 14,321 — — 0.98% $1.2M 2024-10-31 $74.71

🏢 Other funds also holding BXP

As of 2026 Q1 — sorted by position size

Vert Asset Management LLC 3Y 1.15% Analyst IMS Investment Management Services Ltd. 3Y 7Y 0.53% DUFF & PHELPS INVESTMENT MANAGEMENT CO 3Y 7Y 0.48% Pensionfund Sabic 3Y 7Y 0.44% Pensionfund PDN 3Y 7Y 0.41% Michels Family Financial, LLC 0.29% Birch Hill Investment Advisors LLC 3Y 7Y 0.27% Essex LLC 3Y 0.25% Patriot Financial Group Insurance Agency, LLC 3Y 7Y 0.22% MQS Management LLC 3Y 0.21%

FAQ About Mainstream Capital Management LLC and BXP

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

How long has Mainstream Capital Management LLC reported owning BXP?

Mainstream Capital Management LLC reported BXP across 6 quarterly 13F filings, from 2024 Q3 through 2025 Q4.

What was the largest reported BXP position in Mainstream Capital Management LLC's portfolio?

The largest reported portfolio weight for BXP was 0.98% in 2024 Q3.

What is the latest reported BXP position on this page?

The most recent filing on this page is 2025 Q4, when Mainstream Capital Management LLC reported 12,418 shares, equal to 0.55% of portfolio, with an estimated market value of $838K.

What does the chart on this BXP ownership page compare?

The chart compares Mainstream Capital Management LLC's quarterly BXP 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 Mainstream Capital Management LLC time their BXP position?

Based on 13F filing dates vs. subsequent BXP price moves, Mainstream Capital Management LLC correctly timed 1 out of 4 reported position changes (25%). The annualised alpha on BXP relative to SPY over the holding period was -24.3%.

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