HARBOR INVESTMENT ADVISORY, LLC RGEN — REPLIGEN CORP COM

Ownership history in HARBOR INVESTMENT ADVISORY, LLC  ·  23 quarters on record

AI Ownership Summary

HARBOR INVESTMENT ADVISORY, LLC reported REPLIGEN CORP COM (RGEN) in 23 quarterly 13F filings from 2024 Q1 through 2026 Q2. Peak portfolio weight reached 0.04% in 2025 Q1. The latest visible filing shows RGEN 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 RGEN ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was HARBOR INVESTMENT ADVISORY, LLC's position in REPLIGEN CORP 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
2026 Q2

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

High-water mark
Peak Conviction
0.04% in 2025 Q1

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

Time in book
Holding Window
2024 Q1 to 2026 Q2

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.

RGEN stock page HARBOR INVESTMENT ADVISORY, LLC fund profile HARBOR INVESTMENT ADVISORY, LLC full holdings
How HARBOR INVESTMENT ADVISORY, LLC held RGEN — position size vs. price
% of Fund (quarterly)    RGEN 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 Q2 ADDED — — — 523 +348 +198.9% 0.00% $71K 2026-07-07 $139.83
2026 Q1 REDUCED 83.4% +16.3% ❌ 175 -879 -83.4% 0.00% $21K 2026-04-23 $114.06
2025 Q4 UNCHANGED — — — 1,054 — 0% 0.01% $173K 2026-01-07 $169.05
2025 Q3 REDUCED 33.2% +24.0% ❌ 1,054 -525 -33.2% 0.01% $141K 2025-10-27 $161.10
2025 Q2 REDUCED 46.1% -0.2% ✅ 1,579 -1,350 -46.1% 0.02% $196K 2025-07-01 $126.44
2025 Q1 ADDED — — — 2,929 +2,176 +289.0% 0.04% $373K 2025-04-09 $123.85
2024 Q4 UNCHANGED — — — 753 — 0% 0.01% $108K 2025-01-16 $162.85
2024 Q3 ADDED — — — 753 +145 +23.8% 0.01% $112K 2024-10-04 $136.71
2024 Q2 ADDED — — — 608 +107 +21.4% 0.01% $77K 2024-07-19 $123.81
2024 Q1 UNCHANGED — — — 501 — 0% 0.01% $92K 2024-04-12 $171.53
13 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding RGEN

As of 2026 Q2 — sorted by position size

WASATCH ADVISORS LP 3Y 7Y 1.42% CONGRESS ASSET MANAGEMENT CO 3Y 7Y 0.85% RIVERBRIDGE PARTNERS LLC 3Y 7Y 0.66% PEREGRINE CAPITAL MANAGEMENT LLC 3Y 7Y 0.4% MOODY NATIONAL BANK TRUST DIVISION 3Y 7Y 0.2% Benin Management CORP 3Y 7Y 0.14% Portside Wealth Group, LLC 0.13% Covea Finance 3Y 0.12% FNY Investment Advisers, LLC 3Y 7Y 0.1% E. Ohman J:or Asset Management AB 0.09%

FAQ About HARBOR INVESTMENT ADVISORY, LLC and RGEN

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

How long has HARBOR INVESTMENT ADVISORY, LLC reported owning RGEN?

HARBOR INVESTMENT ADVISORY, LLC reported RGEN across 10 quarterly 13F filings, from 2024 Q1 through 2026 Q2.

What was the largest reported RGEN position in HARBOR INVESTMENT ADVISORY, LLC's portfolio?

The largest reported portfolio weight for RGEN was 0.04% in 2025 Q1.

What is the latest reported RGEN position on this page?

The most recent filing on this page is 2026 Q2, when HARBOR INVESTMENT ADVISORY, LLC reported 523 shares, equal to 0.00% of portfolio, with an estimated market value of $71K.

What does the chart on this RGEN ownership page compare?

The chart compares HARBOR INVESTMENT ADVISORY, LLC's quarterly RGEN 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 HARBOR INVESTMENT ADVISORY, LLC time their RGEN position?

Based on 13F filing dates vs. subsequent RGEN price moves, HARBOR INVESTMENT ADVISORY, LLC correctly timed 7 out of 13 reported position changes (54%). The annualised alpha on RGEN relative to SPY over the holding period was -18.4%.

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