Senator Investment Group LP 13F: Quarter-over-Quarter Portfolio Changes
Senator Investment Group LP reported a disclosed portfolio value of approximately $2.2 billion in its latest SEC Form 13F-HR filing for Q1 2026, down 12.7% quarter on quarter. Over the quarter, the fund initiated 17 new positions, bought more shares in 17 holdings, trimmed 15 holdings, and exited 17 positions.
Senator Investment Group LP's top buy was Boeing CO (BA) . The fund bought 1503.6% more shares, lifting the position's portfolio weight by 3.8 percentage points. Its top sell was Capital One Finl CORP (COF) . The fund exited the position completely after it had accounted for 4.6% of the previous portfolio.
New PositionsQ1 2026
Securities disclosed for the first time in Q1 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Portfolio Weight | History |
|---|---|---|---|
| VISA | V | 3.5% | History → |
| BROADCOM | AVGO | 2.7% | Holders → |
| CITIGROUP INC | C | 1.7% | Holders → |
| PFIZER | PFE | 1.6% | Holders → |
| HALLIBURTON CO | HAL | 1.5% | Holders → |
| ISHARES TR | EEM | 1.5% | Holders → |
| ADVANCED ENERGY INDS | AEIS | 1.5% | Holders → |
| L3HARRIS TECHNOLOGIES INC | LHX | 1.4% | Holders → |
| CONOCOPHILLIPS | COP | 1.3% | Holders → |
| APPLIED MATLS INC | AMAT | 1.0% | Holders → |
| RIOT PLATFORMS INC | RIOT | 0.9% | Holders → |
| ROCKET COS INC | RKT | 0.8% | Holders → |
| HASBRO INC | HAS | 0.8% | Holders → |
| CVS HEALTH CORP | CVS | 0.6% | Holders → |
| ECHOSTAR CORP | SATS | 0.6% | Holders → |
| ALKERMES PLC | ALKS | 0.4% | Holders → |
| KINETIK HOLDINGS INC | KNTK | 0.2% | Holders → |
Top BuysQ1 2026
Showing the top 10 buys among 17 existing positions where the fund bought more shares in Q1 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| BOEING CO | BA | +3.8% | +1503.6% | History → |
| DANAHER | DHR | +2.2% | +155.8% | History → |
| META PLATFORMS INC | META | +1.6% | +81.6% | Holders → |
| ISHARES ETHEREUM TR | ETHA | +0.1% | +81.3% | Holders → |
| VISTRA CORP | VST | +0.6% | +78.9% | Holders → |
| TERAWULF INC | WULF | +0.1% | +63.6% | Holders → |
| NVIDIA CORPORATION COM | NVDA | +2.8% | +63.4% | History → |
| MICROSOFT | MSFT | +0.9% | +42.7% | History → |
| AMAZON.COM | AMZN | +1.9% | +41.9% | History → |
| AMER SPORTS INC | AS | +0.6% | +40.6% | Holders → |
Top SellsQ1 2026
Showing the top 10 sells among 15 existing positions where the fund sold shares in Q1 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| ASTRONICS CORP | ATRO | -0.9% | 95.3% | Holders → |
| ROBINHOOD MKTS INC | HOOD | -1.4% | 65.2% | Holders → |
| HOWMET AEROSPACE | HWM | -0.4% | 57.5% | Holders → |
| ATI INC | ATI | -0.5% | 55.4% | Holders → |
| UNITED AIRLS HLDGS INC | UAL | -8.0% | 54.3% | History → |
| TECK RESOURCES LTD | TECK | -1.4% | 53.7% | Holders → |
| UNITEDHEALTH GROUP | UNH | -0.6% | 53.3% | Holders → |
| WOODWARD INC | WWD | -1.7% | 49.8% | History → |
| ARCELORMITTAL SA LUXEMBOURG | MT | -0.2% | 41.2% | Holders → |
| JAMES HARDIE INDS PLC | JHX | -0.6% | 39.4% | Holders → |
Full ExitsQ1 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 | 4.6% |
| SS&C TECH HLDGS | SSNC | 3.6% |
| UNION PACIFIC | UNP | 2.5% |
| GE AEROSPACE | GE | 1.9% |
| PENNYMAC FINL SVCS INC NEW | PFSI | 1.5% |
| BILL HOLDINGS INC | BILL | 1.5% |
| LPL FINL HLDGS INC | LPLA | 1.4% |
| LIFE TIME GROUP HOLDINGS INC | LTH | 1.4% |
| COMCAST CLASS A | CMCSA | 1.4% |
| METHANEX CORP | MEOH | 0.6% |
| ASTRONICS CORP | ATRO 5.5 03/15/30 | 0.4% |
| SELECT SECTOR SPDR TR | XLI | 0.4% |
| TERRESTRIAL ENERGY INC | IMSR | 0.2% |
| KRANESHARES TRUST | KWEB | 0.1% |
| FIDELITY WISE ORIGIN BITCOIN | FBTC | 0.1% |
| PALANTIR TECHNOLOGIES INC | PLTR | 0.1% |
| COINBASE GLOBAL INC | COIN | 0.1% |
Net Portfolio Value ChangeQ1 2026
- $2.5BPrior quarter
- $2.2BCurrent quarter
- $-0.3BNet delta
- -12.7%% change
Methodology & FAQ
How Senator Investment Group LP Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for Senator Investment Group LP: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description — including how confidential treatment filings are handled — is documented in the Methodology.
What stocks did Senator Investment Group LP buy in Q1 2026?
In Q1 2026, Senator Investment Group LP initiated 17 new positions (VISA (V), BROADCOM (AVGO), CITIGROUP INC (C), PFIZER (PFE), HALLIBURTON CO (HAL), ISHARES TR (EEM), ADVANCED ENERGY INDS (AEIS), L3HARRIS TECHNOLOGIES INC (LHX), CONOCOPHILLIPS (COP), APPLIED MATLS INC (AMAT), RIOT PLATFORMS INC (RIOT), ROCKET COS INC (RKT), HASBRO INC (HAS), CVS HEALTH CORP (CVS), ECHOSTAR CORP (SATS), ALKERMES PLC (ALKS), KINETIK HOLDINGS INC (KNTK)); bought more shares of BOEING CO (BA), DANAHER (DHR), META PLATFORMS INC (META), ISHARES ETHEREUM TR (ETHA), VISTRA CORP (VST) — the largest 5 of 17 adds.
What stocks did Senator Investment Group LP sell in Q1 2026?
In Q1 2026, Senator Investment Group LP fully sold 17 positions (CAPITAL ONE FINL CORP (COF), SS&C TECH HLDGS (SSNC), UNION PACIFIC (UNP), GE AEROSPACE (GE), PENNYMAC FINL SVCS INC NEW (PFSI), BILL HOLDINGS INC (BILL), LPL FINL HLDGS INC (LPLA), LIFE TIME GROUP HOLDINGS INC (LTH), COMCAST CLASS A (CMCSA), METHANEX CORP (MEOH), ASTRONICS CORP (ATRO 5.5 03/15/30), SELECT SECTOR SPDR TR (XLI), TERRESTRIAL ENERGY INC (IMSR), KRANESHARES TRUST (KWEB), FIDELITY WISE ORIGIN BITCOIN (FBTC), PALANTIR TECHNOLOGIES INC (PLTR), COINBASE GLOBAL INC (COIN)); reduced holdings in ASTRONICS CORP (ATRO), ROBINHOOD MKTS INC (HOOD), HOWMET AEROSPACE (HWM), ATI INC (ATI), UNITED AIRLS HLDGS INC (UAL) — the largest 5 of 15 reductions.
Which positions did Senator Investment Group LP initiate in Q1 2026?
Senator Investment Group LP established 17 new positions in Q1 2026: VISA (V, 3.5%), BROADCOM (AVGO, 2.7%), CITIGROUP INC (C, 1.7%), PFIZER (PFE, 1.6%), HALLIBURTON CO (HAL, 1.5%), ISHARES TR (EEM, 1.5%), ADVANCED ENERGY INDS (AEIS, 1.5%), L3HARRIS TECHNOLOGIES INC (LHX, 1.4%), CONOCOPHILLIPS (COP, 1.3%), APPLIED MATLS INC (AMAT, 1.0%), RIOT PLATFORMS INC (RIOT, 0.9%), ROCKET COS INC (RKT, 0.8%), HASBRO INC (HAS, 0.8%), CVS HEALTH CORP (CVS, 0.6%), ECHOSTAR CORP (SATS, 0.6%), ALKERMES PLC (ALKS, 0.4%), KINETIK HOLDINGS INC (KNTK, 0.2%).
Which existing positions saw the largest allocation increases for Senator Investment Group LP in Q1 2026?
Of 17 existing positions with share-count increases in Q1 2026, the largest were: BOEING CO (BA, +3.8% weight, +1503.6% shares), DANAHER (DHR, +2.2% weight, +155.8% shares), META PLATFORMS INC (META, +1.6% weight, +81.6% shares), ISHARES ETHEREUM TR (ETHA, +0.1% weight, +81.3% shares), VISTRA CORP (VST, +0.6% weight, +78.9% shares), TERAWULF INC (WULF, +0.1% weight, +63.6% shares), NVIDIA CORPORATION COM (NVDA, +2.8% weight, +63.4% shares), MICROSOFT (MSFT, +0.9% weight, +42.7% shares), AMAZON.COM (AMZN, +1.9% weight, +41.9% shares), AMER SPORTS INC (AS, +0.6% weight, +40.6% 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 4.6%), SS&C TECH HLDGS (SSNC, last-reported weight 3.6%), UNION PACIFIC (UNP, last-reported weight 2.5%), GE AEROSPACE (GE, last-reported weight 1.9%), PENNYMAC FINL SVCS INC NEW (PFSI, last-reported weight 1.5%), BILL HOLDINGS INC (BILL, last-reported weight 1.5%), LPL FINL HLDGS INC (LPLA, last-reported weight 1.4%), LIFE TIME GROUP HOLDINGS INC (LTH, last-reported weight 1.4%), COMCAST CLASS A (CMCSA, last-reported weight 1.4%), METHANEX CORP (MEOH, last-reported weight 0.6%), ASTRONICS CORP (ATRO 5.5 03/15/30, last-reported weight 0.4%), SELECT SECTOR SPDR TR (XLI, last-reported weight 0.4%), TERRESTRIAL ENERGY INC (IMSR, last-reported weight 0.2%), KRANESHARES TRUST (KWEB, last-reported weight 0.1%), FIDELITY WISE ORIGIN BITCOIN (FBTC, last-reported weight 0.1%), PALANTIR TECHNOLOGIES INC (PLTR, last-reported weight 0.1%), COINBASE GLOBAL INC (COIN, last-reported weight 0.1%).
Which existing positions saw the largest allocation reductions for Senator Investment Group LP in Q1 2026?
Of 15 existing positions with share-count reductions in Q1 2026, the largest were: ASTRONICS CORP (ATRO, -0.9% weight, -95.3% shares), ROBINHOOD MKTS INC (HOOD, -1.4% weight, -65.2% shares), HOWMET AEROSPACE (HWM, -0.4% weight, -57.5% shares), ATI INC (ATI, -0.5% weight, -55.4% shares), UNITED AIRLS HLDGS INC (UAL, -8.0% weight, -54.3% shares), TECK RESOURCES LTD (TECK, -1.4% weight, -53.7% shares), UNITEDHEALTH GROUP (UNH, -0.6% weight, -53.3% shares), WOODWARD INC (WWD, -1.7% weight, -49.8% shares), ARCELORMITTAL SA LUXEMBOURG (MT, -0.2% weight, -41.2% shares), JAMES HARDIE INDS PLC (JHX, -0.6% weight, -39.4% 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. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.