--- title: "TMUS: CEO G. Michael Sievert Keeps a Quarterly Selling Cadence as Blocks Drop to 15,000 Shares" type: news slug: tmus-sievert-quarterly-10b5-1-selling-cadence-2026 canonical_url: https://13finsight.com/news/tmus-sievert-quarterly-10b5-1-selling-cadence-2026 published_at: 2026-03-29T01:20:31.253Z updated_at: 2026-03-29T01:20:33.008Z author: Alex Rivera author_title: Breaking News Editor author_url: https://13finsight.com/authors/alex-rivera word_count: 545 locale: en source: 13F Insight --- # TMUS: CEO G. Michael Sievert Keeps a Quarterly Selling Cadence as Blocks Drop to 15,000 Shares > T-Mobile CEO G. Michael Sievert has continued a repeatable two-day selling cadence in TMUS, with block size stepping down from 22,500 shares in 2025 windows to 15,000 shares in February 2026. TMUS: G. Michael Sievert, CEO of T-Mobile US, has kept up a highly repeatable selling cadence that looks like a pre-planned 10b5-1 style program, not a one-off discretionary exit. The pattern is clear: two-day selling windows each quarter, with 22,500-share blocks through 2025 and a smaller 15,000-share window in February 2026. What happened in the latest selling cycle Across the most recent TMUS windows, Sievert sold in tight two-day clusters rather than random dates. The sequence in your transaction set shows a consistent quarterly rhythm, and activity extends into late March 2026 (last transaction date: 2026-03-27 in the prepared insider context). Date Code Shares Price Estimated Value 2026-02-24 S 1,089 $221.85 $242K 2026-02-23 S 13,911 $220.07 $3.1M 2025-11-18 S 22,500 $214.25 $4.8M 2025-11-17 S 22,500 $216.97 $4.9M 2025-08-19 S 22,500 $257.17 $5.8M 2025-08-18 S 22,500 $255.58 $5.8M 2025-05-20 S 22,500 $240.99 $5.4M 2025-05-19 S 22,500 $244.40 $5.5M The key change is sizing: earlier windows were 45,000 shares total (22,500 + 22,500), while February 2026 was 15,000 shares total (13,911 + 1,089). That is still systematic execution, just at a smaller block size. Price path: same cadence, lower execution levels Execution prices in the windows above fell from about $257 in August 2025 to about $221 in February 2026. That decline in sale price does not, by itself, invalidate the cadence; it simply shows the same program running in a different price regime. Third-party market coverage has also described mixed TMUS performance in early 2026, including pullbacks and short rebounds, which fits the idea that systematic plans can keep running through volatility rather than trying to time tops and bottoms: Reuters on T-Mobile's February update, TIKR 2026 TMUS performance note. Company backdrop from earnings season T-Mobile's own Q4 2025 release highlighted strong customer additions and profitability expansion, and management paired results with forward commentary at its investor event. That backdrop matters because pre-planned selling programs often continue regardless of whether a quarter is operationally strong or weak. T-Mobile Q4 2025 earnings release T-Mobile earnings call and Capital Markets Day page Yahoo Finance recap on Q4 beat Key facts for Sievert's insider pattern Insider G. Michael Sievert Company T-Mobile US (TMUS) Career buys $0 Career sells $176.7M Total transactions 155 Shares remaining 125,695 Signal type Systematic insider sell cadence (10b5-1 style) Importantly, this is not the same as saying management is "calling a top." A repeated, scheduled disposition pattern is usually a liquidity/planning mechanism. The informational edge is in changes to cadence, block size, or cancellation, not the mere existence of sales. Cross-market context and what to watch next For relative telecom context, compare trading and ownership behavior across peers such as AT&T, Verizon, Charter, and Comcast. On the ownership side of TMUS itself, large holders include Vanguard, BlackRock, SoftBank Group, and State Street. Window timing: whether the next TMUS sale again lands in a tight two-day cluster. Block size: whether the newer 15,000-share level persists or reverts toward prior 45,000-share quarterly windows. Execution band: whether future sales clear closer to the $220 range or recover toward the mid-$250s seen in 2025. Institutional base: whether top TMUS holders materially add, trim, or stay stable around upcoming 13F cycles. Fundamental cadence: whether subscriber and margin commentary from management continues to support the operating narrative while sales remain systematic. ## FAQ ### Why is G. Michael Sievert's TMUS selling described as systematic? The sales appear in repeat two-day windows with consistent quarterly spacing, which is typical of a pre-planned 10b5-1 style disposition pattern rather than ad-hoc trading. ### Did Sievert stop selling TMUS after 2025? No. The cadence continued into 2026, but the February 2026 window used a smaller total block size of 15,000 shares versus earlier 45,000-share quarterly windows. ### Is systematic insider selling automatically bearish for T-Mobile stock? Not necessarily. Scheduled sales are often used for diversification, tax, or liquidity planning, so the stronger signal is whether cadence or size changes materially over time. ### What price shift is visible in Sievert's recent TMUS sales? The transaction prices in the documented windows declined from roughly $257 in August 2025 to roughly $221 in February 2026. --- Source: 13F Insight — https://13finsight.com/news/tmus-sievert-quarterly-10b5-1-selling-cadence-2026 Author: Alex Rivera — https://13finsight.com/authors/alex-rivera Last updated: 2026-03-29T01:20:33.008Z