Senator Investment Group LP — Quarter-over-Quarter 13F Allocation Shifts Q1 2026
In Q1 2026, Senator Investment Group LP initiated 17 new positions, increased allocation to 10 existing positions, trimmed 10 positions, and exited 17 positions entirely. The fund's 13F equity book declined from $2.49B to $2.18B (-12.7% QoQ) . All deltas are sourced from sequential SEC Form 13F-HR filings; share-count changes reflect explicit trading activity, while weight changes can also include price movement. This page lists every position change reported — the portfolio overview shows a summary of the top shifts.
Net Portfolio Value Change
- $2.49BPrior quarter
- $2.18BCurrent quarter
- $-0.32BNet delta
- -12.7%% change
New Position Initiations Q1 2026
Securities disclosed for the first time in Q1 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Allocation Weight | History |
|---|---|---|---|
| VISA INC | V | 3.54% | History → |
| BROADCOM INC | AVGO | 2.67% | Holders → |
| CITIGROUP INC | C | 1.72% | Holders → |
| PFIZER INC | PFE | 1.61% | Holders → |
| HALLIBURTON CO | HAL | 1.52% | Holders → |
| ISHARES TR | EEM | 1.49% | Holders → |
| ADVANCED ENERGY INDS | AEIS | 1.48% | Holders → |
| L3HARRIS TECHNOLOGIES INC | LHX | 1.43% | Holders → |
| CONOCOPHILLIPS | COP | 1.33% | Holders → |
| APPLIED MATLS INC | AMAT | 1.02% | Holders → |
| RIOT PLATFORMS INC | RIOT | 0.85% | Holders → |
| ROCKET COMPANIES, INC., CLASS A | RKT | 0.82% | Holders → |
| HASBRO INC | HAS | 0.75% | Holders → |
| CVS HEALTH CORP | CVS | 0.58% | Holders → |
| ECHOSTAR CORP | SATS | 0.55% | Holders → |
| ALKERMES PLC | ALKS | 0.38% | Holders → |
| KINETIK HOLDINGS INC | KNTK | 0.17% | Holders → |
Largest Allocation Increases Q1 2026
Largest portfolio-weight increases in existing positions. Share-count delta is shown separately so price-only re-weighting can be distinguished from active adds.
| Company | Ticker | Δ Weight | Δ Shares | History |
|---|---|---|---|---|
| THE BOEING COMPANY | BA | +3.79% | +1503.64% | History → |
| DANAHER CORP DEL | DHR | +2.22% | +155.77% | History → |
| META PLATFORMS INC | META | +1.56% | +81.55% | Holders → |
| ISHARES ETHEREUM TR | ETHA | +0.06% | +81.34% | Holders → |
| VISTRA CORP. | VST | +0.65% | +78.88% | Holders → |
| TERAWULF INC | WULF | +0.05% | +63.61% | Holders → |
| NVIDIA CORPORATION | NVDA | +2.83% | +63.41% | History → |
| MICROSOFT CORP | MSFT | +0.91% | +42.67% | History → |
| AMAZON COM INC | AMZN | +1.86% | +41.86% | History → |
| AMER SPORTS INC | AS | +0.58% | +40.65% | Holders → |
Largest Allocation Reductions Q1 2026
Largest portfolio-weight decreases in existing positions (positions kept open at a lower allocation).
| Company | Ticker | Δ Weight | Δ Shares | History |
|---|---|---|---|---|
| ASTRONICS CORP | ATRO | -0.93% | -95.31% | Holders → |
| ROBINHOOD MKTS INC | HOOD | -1.39% | -65.19% | Holders → |
| HOWMET AEROSPACE INC | HWM | -0.36% | -57.46% | Holders → |
| ATI INC | ATI | -0.53% | -55.38% | Holders → |
| UNITED AIRLINES HOLDINGS INC | UAL | -7.98% | -54.30% | History → |
| TECK RESOURCES LTD., CLASS B | TECK | -1.36% | -53.68% | Holders → |
| UNITEDHEALTH GROUP INC | UNH | -0.56% | -53.33% | Holders → |
| WOODWARD INC | WWD | -1.75% | -49.83% | History → |
| ARCELORMITTAL SA LUXEMBOURG | MT | -0.25% | -41.16% | Holders → |
| JAMES HARDIE INDS PLC | JHX | -0.56% | -39.39% | Holders → |
Exited Positions Q1 2026
Positions present in the prior 13F-HR filing that no longer appear in Q1 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| CAPITAL ONE FINL CORP | COF | 4.58% |
| SS&C TECHNOLOGIES HLDGS INC | SSNC | 3.63% |
| UNION PACIFIC CORP (UNP) | UNP | 2.55% |
| GE AEROSPACE | GE | 1.85% |
| PENNYMAC FINL SVCS INC NEW | PFSI | 1.52% |
| BILL HOLDINGS INC | BILL | 1.52% |
| LPL FINL HLDGS INC | LPLA | 1.43% |
| LIFE TIME GROUP HOLDINGS INC | LTH | 1.41% |
| COMCAST CORP NEW | CMCSA | 1.40% |
| METHANEX CORP | MEOH | 0.60% |
| ASTRONICS CORP | SYN_046433AD0 | 0.41% |
| SS INDUSTRIAL SELECT SECTOR | XLI | 0.38% |
| TERRESTRIAL ENERGY INC | IMSR | 0.22% |
| KRANESHARES TRUST | KWEB | 0.14% |
| FIDELITY WISE ORIGIN BITCOIN | FBTC | 0.10% |
| PALANTIR TECHNOLOGIES INC | PLTR | 0.09% |
| COINBASE GLOBAL INC | COIN | 0.07% |
Methodology & FAQ
How Senator Investment Group LP Quarterly Changes Are Computed
Each row above is computed by joining the most recent 13F-HR filing for Senator Investment Group LP against the immediately preceding quarterly filing for the same fund. Portfolio weights are normalized to exclude listed options for comparability. A complete description of the methodology — including how confidential treatment filings are handled and why share count rather than weight is the cleaner trading signal — is documented in the Methodology.
Which positions did Senator Investment Group LP initiate in Q1 2026?
Senator Investment Group LP established 17 new positions in Q1 2026: VISA INC (V, 3.54%), BROADCOM INC (AVGO, 2.67%), CITIGROUP INC (C, 1.72%), PFIZER INC (PFE, 1.61%), HALLIBURTON CO (HAL, 1.52%), ISHARES TR (EEM, 1.49%), ADVANCED ENERGY INDS (AEIS, 1.48%), L3HARRIS TECHNOLOGIES INC (LHX, 1.43%), CONOCOPHILLIPS (COP, 1.33%), APPLIED MATLS INC (AMAT, 1.02%), RIOT PLATFORMS INC (RIOT, 0.85%), ROCKET COMPANIES, INC., CLASS A (RKT, 0.82%), HASBRO INC (HAS, 0.75%), CVS HEALTH CORP (CVS, 0.58%), ECHOSTAR CORP (SATS, 0.55%), ALKERMES PLC (ALKS, 0.38%), KINETIK HOLDINGS INC (KNTK, 0.17%).
Which existing positions saw the largest allocation increases for Senator Investment Group LP in Q1 2026?
The largest portfolio-weight increases in existing positions were: THE BOEING COMPANY (BA, +3.79% weight, +1503.64% shares), DANAHER CORP DEL (DHR, +2.22% weight, +155.77% shares), META PLATFORMS INC (META, +1.56% weight, +81.55% shares), ISHARES ETHEREUM TR (ETHA, +0.06% weight, +81.34% shares), VISTRA CORP. (VST, +0.65% weight, +78.88% shares), TERAWULF INC (WULF, +0.05% weight, +63.61% shares), NVIDIA CORPORATION (NVDA, +2.83% weight, +63.41% shares), MICROSOFT CORP (MSFT, +0.91% weight, +42.67% shares), AMAZON COM INC (AMZN, +1.86% weight, +41.86% shares), AMER SPORTS INC (AS, +0.58% weight, +40.65% shares).
Which positions did Senator Investment Group LP fully exit in Q1 2026?
Senator Investment Group LP fully exited 17 positions in Q1 2026: CAPITAL ONE FINL CORP (COF, last-reported weight 4.58%), SS&C TECHNOLOGIES HLDGS INC (SSNC, last-reported weight 3.63%), UNION PACIFIC CORP (UNP) (UNP, last-reported weight 2.55%), GE AEROSPACE (GE, last-reported weight 1.85%), PENNYMAC FINL SVCS INC NEW (PFSI, last-reported weight 1.52%), BILL HOLDINGS INC (BILL, last-reported weight 1.52%), LPL FINL HLDGS INC (LPLA, last-reported weight 1.43%), LIFE TIME GROUP HOLDINGS INC (LTH, last-reported weight 1.41%), COMCAST CORP NEW (CMCSA, last-reported weight 1.40%), METHANEX CORP (MEOH, last-reported weight 0.60%), ASTRONICS CORP (SYN_046433AD0, last-reported weight 0.41%), SS INDUSTRIAL SELECT SECTOR (XLI, last-reported weight 0.38%), TERRESTRIAL ENERGY INC (IMSR, last-reported weight 0.22%), KRANESHARES TRUST (KWEB, last-reported weight 0.14%), FIDELITY WISE ORIGIN BITCOIN (FBTC, last-reported weight 0.10%), PALANTIR TECHNOLOGIES INC (PLTR, last-reported weight 0.09%), COINBASE GLOBAL INC (COIN, last-reported weight 0.07%).
Which existing positions saw the largest allocation reductions for Senator Investment Group LP in Q1 2026?
The largest portfolio-weight reductions in positions kept open were: ASTRONICS CORP (ATRO, -0.93% weight, -95.31% shares), ROBINHOOD MKTS INC (HOOD, -1.39% weight, -65.19% shares), HOWMET AEROSPACE INC (HWM, -0.36% weight, -57.46% shares), ATI INC (ATI, -0.53% weight, -55.38% shares), UNITED AIRLINES HOLDINGS INC (UAL, -7.98% weight, -54.30% shares), TECK RESOURCES LTD., CLASS B (TECK, -1.36% weight, -53.68% shares), UNITEDHEALTH GROUP INC (UNH, -0.56% weight, -53.33% shares), WOODWARD INC (WWD, -1.75% weight, -49.83% shares), ARCELORMITTAL SA LUXEMBOURG (MT, -0.25% weight, -41.16% shares), JAMES HARDIE INDS PLC (JHX, -0.56% weight, -39.39% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity.