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MMID

MFS Active Mid Cap ETF
MMID

2 hedge funds and large institutions have $237K invested in MFS Active Mid Cap ETF in 2026 Q1 according to their latest regulatory filings, with 2 funds opening new positions, increasing their positions, 0 reducing their positions, and 1 closing their positions.

New
Increased
Maintained
Reduced
Closed

100% more funds holding

Funds holding: 1 → 2 (+1)

100% more first-time investments, than exits

New positions opened: 2 | Existing positions closed: 1

13% more capital invested

Capital invested by funds: $211K → $237K (+$26.6K)

0.1% more ownership

Funds ownership: 0.65% → 0.74% (+0.1%)

Holders
2
Holders Change
+1
Holders Change %
+100%
% of All Funds
0.02%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
2
Increased
–
Reduced
–
Closed
1
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Commonwealth Equity Services
Commonwealth Equity Services
Massachusetts
+$246K
2
Fidelity Investments
Fidelity Investments
Massachusetts
+$26

Top Sellers

Rank Fund Capital Flow
1
Jane Street
Jane Street
New York
-$211K
Name Holding Trade Value Shares
Change 		Change in
Stake
Commonwealth Equity Services
1
Commonwealth Equity Services
Massachusetts
$237K +$246K +9,634 New
Fidelity Investments
2
Fidelity Investments
Massachusetts
$25 +$26 +1 New
Jane Street
3
Jane Street
New York
– -$211K -8,399 Closed

MMID Hedge Fund Activity: Q1 2026 in Review

2 of the 8,130 institutional investors tracked by Wall St. Rank reported a position in MFS Active Mid Cap ETF (MMID) for Q1 2026, worth a combined $237K — up 13% from $211K a quarter earlier.

Buyers outnumbered sellers: 2 funds opened new MMID positions and 1 closed out — a net gain of 1 holder — while 0 added to existing stakes and 0 trimmed.

The largest buyer was Commonwealth Equity Services, opening a new position worth an estimated $246K. The largest seller was Jane Street, exiting entirely with an estimated $211K sold.

  • 2 institutional investors held MFS Active Mid Cap ETF (MMID) as of Q1 2026, up from 1 in Q4 2025.
  • Funds reported $237K of MFS Active Mid Cap ETF stock for Q1 2026, up 13% quarter-over-quarter.
  • 2 funds opened new MFS Active Mid Cap ETF positions in Q1 2026 and 1 closed out, a net change of +1 holder.
  • The largest MFS Active Mid Cap ETF buyer in Q1 2026 was Commonwealth Equity Services, an estimated $246K added.
  • The largest MFS Active Mid Cap ETF seller in Q1 2026 was Jane Street, an estimated $211K sold.

Based on aggregated 13F filings for Q1 2026.