AT&T
AT&T disclosed that threat actors illegally downloaded call and text interaction records covering nearly all wireless customers for specified periods.
+3.0% T vs -4.2% SPY
This site shows how share prices moved after an incident became public. It does not prove that the incident caused the move. Company news, sector moves and the wider market can affect every result. Educational only — not investment advice.
Disclosure timing
When could the market react?
The baseline is the last adjusted close before the news was public. The reaction session is the first close afterward.
- 01Baseline sessionJul 11, 2024
Normalized to 100 for both T and SPY.
- 02Public disclosureJul 12, 2024, 6:25 AM EDT
Documented publication time.
- 03First reaction closeJul 12, 2024
-0.3% company total return versus +0.6% for SPY; -0.9 pp market-relative return.
Time windows
Company vs SPY
Each row uses the last trading session on or before its target date. “Market-relative” is the company return minus the SPY return, in percentage points.
| Window | Endpoint | T | SPY | Market-relative | Signal |
|---|---|---|---|---|---|
| First reaction | Jul 12, 2024 | -0.3% | +0.6% | -0.9 pp | Below SPY |
| +7 days | Jul 19, 2024 | +1.4% | -1.3% | +2.7 pp | Above SPY |
| +1 month | Aug 12, 2024 | +3.0% | -4.2% | +7.2 pp | Above SPY |
| +3 months | Oct 11, 2024 | +14.8% | +4.5% | +10.3 pp | Above SPY |
| +6 months | Jan 10, 2025 | +18.0% | +5.0% | +13.0 pp | Above SPY |
| +12 months | Jul 11, 2025 | +49.7% | +13.5% | +36.3 pp | Above SPY |
Compare with current catalog aggregates
| Window | This case | Catalog median | Catalog mean | n |
|---|---|---|---|---|
| First reaction | -0.9 pp | -0.8 pp | -1.5 pp | 30 |
| +7 days | +2.7 pp | -2.0 pp | -4.0 pp | 30 |
| +1 month | +7.2 pp | -6.6 pp | -6.8 pp | 30 |
| +3 months | +10.3 pp | -5.1 pp | -6.6 pp | 30 |
| +6 months | +13.0 pp | -5.6 pp | -7.5 pp | 30 |
| +12 months | +36.3 pp | -3.7 pp | -10.1 pp | 30 |
Normalized total return
T compared with SPY
Baseline session = 100. Adjusted close reflects splits and reinvested distributions.
AT&T had +49.7% company total return versus +13.5% for SPY; +36.3 pp market-relative return. The chart shows normalized adjusted-close performance for up to 24 months.
View tabular chart fallback
| Date | T | SPY |
|---|---|---|
| Jul 11, 2024 | 100.0 | 100.0 |
| Aug 9, 2024 | 103.3 | 95.8 |
| Sep 10, 2024 | 115.1 | 98.6 |
| Oct 9, 2024 | 116.3 | 104.0 |
| Nov 7, 2024 | 118.4 | 107.4 |
| Dec 9, 2024 | 125.5 | 109.0 |
| Jan 10, 2025 | 118.0 | 105.0 |
| Feb 11, 2025 | 136.8 | 109.5 |
| Mar 13, 2025 | 141.9 | 99.7 |
| Apr 11, 2025 | 147.2 | 96.9 |
| May 13, 2025 | 145.4 | 106.5 |
| Jun 12, 2025 | 155.4 | 109.5 |
| Jul 15, 2025 | 150.0 | 113.2 |
| Aug 13, 2025 | 157.7 | 117.3 |
| Sep 12, 2025 | 164.1 | 119.6 |
| Oct 13, 2025 | 143.6 | 121.0 |
| Nov 11, 2025 | 141.3 | 124.6 |
| Dec 11, 2025 | 136.3 | 125.7 |
| Jan 13, 2026 | 132.3 | 126.9 |
| Feb 12, 2026 | 163.5 | 124.7 |
| Mar 16, 2026 | 157.4 | 122.4 |
| Apr 15, 2026 | 146.0 | 128.4 |
| May 14, 2026 | 141.4 | 137.3 |
| Jun 15, 2026 | 133.6 | 138.5 |
| Jul 10, 2026 | 122.8 | 138.9 |
Price recovery
Recovered
Here, recovery only means that adjusted close reached the baseline again. It does not mean every effect of the incident ended.
- State
- Recovered
- Initial trough
- -1.5% on Jul 15, 2024
- Recovery close
- Jul 17, 2024
- Calendar days
- 5
- Observation cap
- 24 months after disclosure
Hypothetical $1,000
What would $1,000 have looked like?
Compare $1,000 in T with $1,000 in SPY, bought and measured on the same dates.
Entry Jul 15, 2024 Exit Jan 15, 2025
Uses fractional shares and adjusted close. Leaves out taxes, fees and slippage. The holding period starts on the purchase date. This is a historical illustration, not an investment strategy.
Case note
AT&T reported that records of calls and texts for nearly all wireless customers, mobile virtual network customers and some landline customers were copied from a third-party cloud environment. The content of communications was not part of the dataset described.
The 8-K was accepted before the July 12 market open. July 11 is the baseline and July 12 the first reaction close, while the earlier compromise and investigation dates remain contextual only.
Evidence
Sources and case review
We qualify each case before checking its price results. These links support the disclosure date, listing, incident and business impact.
- primary Jul 12, 2024AT&T July 12, 2024 Form 8-K filing detail AT&T / U.S. SEC Supports: Disclosure, Timing, Listing, Impact, Description
- Listing evidenceChecked Jul 20, 2026AT&T July 12, 2024 Form 8-K filing detail U.S. Securities and Exchange Commission The filing identifies AT&T as NYSE: T and was accepted at 6:25:23 a.m. EDT.
Why it is included. AT&T directly suffered the compromise, reported it under Item 1.05 and described an exceptionally broad customer-record population in a pre-market filing. Reviewed Jul 20, 2026.