Westfield Capital Management
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Westfield Capital Management’s Rhythm Pharmaceuticals RYTM Stock Holding History

Westfield Capital Management’s Portfolio RYTM Stock Details RYTM Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$245M Buy
2,208,595
+279,472
+14% +$25.3M 0.8% 21
2026
Q1 		$168M Buy
1,929,123
+661,965
+52% +$64.4M 0.7% 26
2025
Q4 		$136M Buy
1,267,158
+198,154
+19% +$21M 0.57% 40
2025
Q3 		$108M Sell
1,069,004
-560,464
-34% -$52M 0.45% 56
2025
Q2 		$103M Buy
1,629,468
+288,376
+22% +$17.7M 0.43% 61
2025
Q1 		$71M Buy
+1,341,092
New +$74.4M 0.35% 87

Other funds holding RYTM

RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
BBA
Baker Bros. Advisors New York $20B AUM 154.41% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
PA
Perceptive Advisors New York $6.66B AUM 360.84% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

Westfield Capital Management's RYTM Position: Q2 2026 in Review

Westfield Capital Management increased its Rhythm Pharmaceuticals (RYTM) stake by 14% in Q2 2026, buying an estimated $25.3M and bringing the position to 2,208,595 shares worth $245M. The position accounts for 0.8% of the portfolio, ranked #21.

Westfield Capital Management first reported a position in RYTM in Q1 2025 and has held it in 6 quarters since. 303 funds tracked by Wall St. Rank hold RYTM as of Q2 2026.

  • Westfield Capital Management held 2,208,595 shares of Rhythm Pharmaceuticals worth $245M as of Q2 2026.
  • Westfield Capital Management bought 279,472 Rhythm Pharmaceuticals shares in Q2 2026, an estimated $25.3M.
  • Rhythm Pharmaceuticals made up 0.8% of Westfield Capital Management's portfolio in Q2 2026, its #21 holding.
  • Westfield Capital Management first reported a position in Rhythm Pharmaceuticals in Q1 2025 and has held it in 6 quarters since.
  • 303 funds tracked by Wall St. Rank held Rhythm Pharmaceuticals as of Q2 2026.

Based on Westfield Capital Management's 13F filing for Q2 2026, filed 12 Aug 2026.