Whale Tracker

NEUTRAL — WATCH

No clear whale direction for WDC. Bullish and bearish signals roughly cancel out. Short interest at 10.4% of float — moderate bearish positioning. Insiders are net sellers (148,117 shares sold vs 2,715 bought) — management reducing exposure. Strong institutional ownership at 101.2% with 4 of 10 top holders actively accumulating this quarter.

Action Plan

Hold existing positions — no strong directional signal
Wait for clearer whale activity before adding
Monitor next earnings for institutional positioning changes

📈 Options Flow 期权异动

Unusual options volume vs open interest. High volume/OI ratio signals whale positioning. Put/Call ratio indicates directional bias.

PUT / CALL RATIO

0 (Bullish)1.02.0+ (Bearish)

0.98

LEAN BULLISH

CALL VOLUME

9,125

PUT VOLUME

8,960

TOTAL VOLUME

18,085

UNUSUAL STRIKES

Unusual Strikes — Vol/OI > 3x (4C / 6P)

TypeStrikeExpiryVolOIRatio

PUT$3052026-06-2632132.0x

CALL$4252026-07-1030130.0x

CALL$4752026-07-1020120.0x

CALL$6052026-06-1824212.0x

PUT$3152026-06-263649.0x

PUT$5322026-06-182538.3x

PUT$282026-06-18616.0x

CALL$4352026-07-101226.0x

PUT$3502026-07-1064125.3x

PUT$3402026-07-104285.2x

High Volume Contracts — Vol > 500 (2 contracts)

TypeStrikeExpiryVolume

CALL$7202026-06-12624

PUT$3502026-06-18543

P/C OI RATIO

1.43

TOTAL OI

145,056

CALL OI

59,711

PUT OI

85,345

Put/Call volume ratio: 0.98 (bullish)
Total options volume: 18,085 (calls 9,125 / puts 8,960)
Top unusual: PUT $305.0 exp 2026-06-26 — vol/OI 32.0x
24 unusual strikes detected (15C / 9P)

👤 Insider Trading 内部交易

SEC Form 4 filings — officer and director buys/sells in the last 90 days. Net buying is a strong bullish signal.

2% BUY

98% SELL

SHARES BOUGHT (6m)

2,715

SHARES SOLD (6m)

148,117

NET INSIDER FLOW

-145,402

FORM 4 FILINGS (90d)

Recent Insider Transactions (0 buys / 7 sells / 0 grants)

TypeInsiderSharesDate

SELLTREGILLIS CYNTHIA LOCK4322026-06-05

SELLGUBBI VIDYADHARA K2,4752026-06-01

SELLKIDDOO BRUCE E7502026-05-28

SELLTREGILLIS CYNTHIA LOCK5222026-05-27

SELLTREGILLIS CYNTHIA LOCK1062026-05-21

SELLDAVIS BRIAN SCOTT10,0002026-05-11

SELLGUBBI VIDYADHARA K4,6742026-05-04

Insider buying: 2,715 shares
Insider selling: 148,117 shares
37 Form 4 filings in last 90 days
Net insider SELLING — bearish signal

🏦 Smart Money Flow 机构资金流向

Quarter-over-quarter position changes from 13F filings. Shows whether institutional investors are accumulating (buying more) or distributing (selling) — the strongest signal of whale conviction.

INSTITUTIONAL OWNERSHIP

101.2%

ACCUMULATION vs DISTRIBUTION

40% ACCUMULATING

60% DISTRIBUTING

NET SHARES FLOW

+27,129,447

FLOW SCORE

+0.24

ADDING

SELLING

Institutional Position Changes (QoQ)

ActionInstitution% HeldQoQ ΔShares Δ

★ NEW POSITIONVanguard Capital Management LLC6.39%NEW+11,017,430

★ NEW POSITIONCapital World Investors3.45%NEW+10,816,433

★ NEW POSITIONVanguard Portfolio Management LLC4.98%NEW+8,586,326

▲▲ HEAVY BUYJPMORGAN CHASE & CO5.08%+22.5%+3,216,516

▬ HOLDBlackrock Inc.10.38%+0.7%+259,222

▬ HOLDGeode Capital Management, LLC2.75%+2.1%+194,927

▬ HOLDState Street Corporation4.49%-1.5%-230,738

▼ TRIMMINGMorgan Stanley2.30%-11.2%-1,005,357

▼ TRIMMINGFMR, LLC9.17%-6.4%-2,169,505

▼▼ HEAVY SELLBank of America Corporation2.46%-29.5%-3,555,807

ETF & Mutual Fund Flow (1 adding / 1 selling)

ActionFundQoQ ΔShares Δ

▬ HOLDVANGUARD INDEX FUNDS-Vanguard Total Stock Mar+0.2%+20,417

▬ HOLDVANGUARD INDEX FUNDS-Vanguard 500 Index Fund-0.1%-6,897

▬ HOLDVANGUARD INDEX FUNDS-Vanguard Mid-Cap Index F-1.6%-119,812

▬ HOLDInvesco QQQ Trust, Series 1+1.6%+114,276

▬ HOLDiShares Trust-iShares Core S&P 500 ETF+0.6%+24,421

▬ HOLDFidelity Concord Street Trust-Fidelity 500 In+0.3%+15,153

▬ HOLDSPDR S&P 500 ETF TRUST-State Street SPDR S&P +2.6%+101,013

★ NEW POSIAMERICAN BALANCED FUNDNEW+1,899,937

▬ HOLDJPMorgan Trust II-JPMorgan Large Cap Growth F0.0%0

▼▼ HEAVY SEColumbia Fd.s Series TRT II-Columbia Seligman-28.2%-1,345,968

Institutional ownership: 101.2%
Smart money flow: 4 adding / 3 selling / 3 hold
Net shares added by institutions: +27,129,447
Biggest mover: Vanguard Capital Management LLC added 11,017,430 shares (+100.0%)

🕶 Short Interest & Dark Pool 做空 & 暗池

Short interest as % of float and days-to-cover. Rising SI = bearish pressure. High SI + decreasing = shorts covering (bullish). Squeeze risk rated by SI level.

SHORT INTEREST (% OF FLOAT)

0%10%20%30%+

SHORT % FLOAT

10.4%

DAYS TO COVER

4.0

SI CHANGE (MoM)

↑ 9.4%

SQUEEZE RISK

MODERATE

SHARES SHORT

31,871,127

PRIOR MONTH

29,140,914

FLOAT SHARES

342,279,697

AVG VOLUME

7,780,611

Elevated short interest — bears have a notable position. Watch for SI trend direction as the key signal.

Short interest: 10.4% of float
Days to cover: 4.0
Short interest MoM: ↑ 9.4%
Squeeze risk: MODERATE

📡 Data Sources 数据来源

Options Flow

LEAN BULLISH (80%)

Insider Trading

BEARISH (90%)

Smart Money Flow

LEAN BULLISH (75%)

Short Interest

LEAN BEARISH (60%)

📋 Summary 综合摘要

[dark_pool] Short interest: 10.4% of float
[dark_pool] Days to cover: 4.0
[institutional] Institutional ownership: 101.2%
[institutional] Smart money flow: 4 adding / 3 selling / 3 hold
[options_flow] Put/Call volume ratio: 0.98 (bullish)
[options_flow] Total options volume: 18,085 (calls 9,125 / puts 8,960)
[insider] Insider buying: 2,715 shares
[insider] Insider selling: 148,117 shares