What is the StonkWhisper Whisper Index?

The Whisper Index is StonkWhisper's proprietary market sentiment score (0–90) that aggregates retail investor discussion velocity, volume, and sentiment across Reddit, StockTwits, and other social platforms for 500+ U.S. equities in real time.

What is dark pool trading and why does it matter for stock analysis?

Dark pools are off-exchange trading venues where large institutional orders execute away from public markets. StonkWhisper tracks FINRA-reported dark pool volume to identify unusual institutional accumulation or distribution that may precede significant price moves.

How does StonkWhisper track congressional stock trades?

The STOCK Act requires U.S. Congress members to disclose personal stock trades within 45 days. StonkWhisper monitors these mandatory disclosures in near real-time, surfacing trades by legislators who may have non-public information advantages.

Mawer increased MCK position by 94,769 shares

Aug 11, 2026Last updated Aug 12, 2026

This StonkWhisper whale intelligence report documents significant institutional position changes in $MCK based on SEC 13F filings and block-level trading data. Quarterly 13F disclosures are required for institutional investment managers with at least $100 million in qualifying assets under management. These filings reveal long positions in U.S. equities held as of quarter end. Material changes in institutional positioning — particularly from concentrated funds with a history of high-conviction bets — are tracked by StonkWhisper as leading indicators of institutional thesis formation or exit.

Mawer Investment Management Ltd. AUM: $14.7B INCREASED

AUM: $14.7B · 142 holdings · Period: 2026-06-30

+94,769 Share Change

180,449 Current Shares

$136.3B Current Value

0.93% Portfolio %

+110.6% Change %

Position Change Detail

Issuer MCKESSON CORP

Ticker MCK

Shares 85,680 → 180,449 +94,769

Value $74.1B → $136.3B

Portfolio Weight 0.93%

Change Type Increased

Period of Report 2026-06-30

Other Mawer Positions This Period

Ticker	Issuer	Change Type	Share Change	Value
NVDA	NVIDIA CORPORATION	Increased	+2,127,064	$616.0B
SKM	SK TELECOM CO LTD	New	+1,708,146	$54.9B
APH	AMPHENOL CORP	Decreased	1,628,476	$415.8B
MRSH	MARSH & MCLENNAN COS INC	Decreased	1,604,431	$311.9B
BAC	VERIZON COMMUNICATIONS INC	Decreased	1,054,206	$71.0B
TME	TENCENT MUSIC ENTMT GROUP	Decreased	1,011,904	$51.8B
AEP	AMERICAN ELEC PWR CO INC	Increased	+949,366	$312.5B
SHEL	SHELL PLC	Increased	+893,456	$621.4B
VVV	VALVOLINE INC	Decreased	743,489	$13.5B
BKNG	BOOKING HOLDINGS INC	Increased	+683,781	$132.0B

Other Whales Moving MCK This Period

Manager	Change Type	Share Change
State Street	Decreased	4,638
Fisher Investments	Increased	+1,379
Winton	New	+560

View all sentiment, news, and whale activity for MCK (MCKESSON CORP).

Track Mawer and other whale moves in real time on The Wire →

Get alerts when new 13F filings drop — Go Pro →

Data sourced from SEC 13F institutional holdings filings. This page does not constitute financial advice. StonkWhisper presents public records — it does not verify or guarantee the accuracy of institutional filings. 13F filings are reported quarterly and may lag actual positions.

Last updated: August 12, 2026 at 06:03 UTC