Question 1

Which hedge funds and institutional investors hold AMPH?

Accepted Answer

StonkWhisper tracks 13F filings submitted to the SEC by institutional investment managers with over $100 million in assets. The whale tracker for AMPH shows which major funds hold positions, their portfolio weight, share counts, and how those positions changed quarter over quarter.

Question 2

What does conviction level mean for AMPH whale holdings?

Accepted Answer

Conviction level reflects how significant AMPH is within a fund's overall portfolio. A high-conviction position means the manager has allocated a large percentage of their portfolio to AMPH, suggesting strong directional confidence in the stock.

Question 3

How current is the whale data for AMPH?

Accepted Answer

Institutional 13F filings are required within 45 days of each calendar quarter end (March 31, June 30, September 30, December 31). StonkWhisper processes filings as they are published on SEC EDGAR, so data reflects the most recently reported quarter.

Question 4

What do quarter-over-quarter changes tell me about AMPH?

Accepted Answer

QoQ changes for AMPH show whether institutional managers are increasing, decreasing, initiating, or exiting their positions. New positions and significant increases can signal growing institutional conviction, while exits or decreases may indicate waning confidence.

Manager	Shares	Value	% of Portfolio	Manager AUM
State Street	1.6M	$31.5M	0.0%	$2896.4B
American Century	1.0M	$19.9M	0.0%	$194.3B
Epoch	898.9K	$17.6M	0.1%	$16.5B
Invesco	571.4K	$11.2M	0.0%	$653.3B
Renaissance Tech	553.9K	$10.9M	0.0%	$63.9B
Millennium	371.4K	$7.3M	0.0%	$240.3B
Arrowstreet	325.3K	$6.4M	0.0%	$184.8B
Two Sigma	138.1K	$2.7M	0.0%	$123.9B
Geode Capital	125.8K	$2.5M	0.0%	$1607.5B
Citadel	65.5K	$1.3M	0.0%	$618.5B
DFA	54.3K	$1.1M	0.0%	$481.4B
Man Group	37.2K	$729K	0.0%	$55.1B
Segall Bryant	33.3K	$653K	0.0%	$7.0B
Franklin Templeton	24.3K	$476K	0.0%	$408.3B
DE Shaw	21.8K	$426K	0.0%	$166.3B
Citadel	19.9K	$390K	0.0%	$618.5B
Brevan Howard	11.6K	$228K	0.0%	$11.3B
PDT Partners	11.4K	$224K	0.0%	$1.7B
Marshall Wace	7.5K	$147K	0.0%	$100.4B
LSV	651.7K	$13K	0.0%	$46.4M
Fidelity (FMR)	187	$4K	—	$1898.4B
Northern Trust	161	$3K	—	$756.6B
AQR Capital	100	$2K	—	$218.4B
BlackRock	46	$901	—	$5723.5B

AMPH

Who Holds AMPH

Changes This Quarter