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Simplex Trading Portfolio holdings
AUM
$171B
Turnover
30.09%
1-Year Est. Return
85%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
(+14%)
Cap. Flow
-$29.5M
Cap. Flow % of AUM
Cap. Flow %
-0.02%
Top 10 Holdings %
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held
Equity + Options
2.9
years
Top 10 Avg Time Held
Equity + Options
3.8
years
Top 20 Avg Time Held
Equity + Options
4.1
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.3
years
Top 20 Avg Time Held Equity only
0.3
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
5626
NEOS Russell 2000 High Income ETF
IWMI
$1.32B
| $93.4K | ﹤0.01% |
+1,745
| New | +$89.6K |
2026 Q2
0 quarters
|
|
5627
PUT
Upbound Group
UPBD
$1.09B
| $93.4K | ﹤0.01% |
4,400
-27,500
| -86% | -$514K |
2025 Q1
5 quarters
|
|
5628
Nabors Industries
NBR
$1.32B
| $93.3K | ﹤0.01% |
1,111
-725
| -39% | -$67.5K |
2025 Q3
3 quarters
|
|
5629
CALL
Gray Television
GTN
$449M
| $93.3K | ﹤0.01% |
23,500
+3,500
| +18% | +$16.1K |
2023 Q4
10 quarters
|
|
|
COII
5630
CALL
DELISTED
REX COIN Covered Call ETF
COII
| $93.2K | ﹤0.01% |
4,800
+3,700
| +336% | +$34.7K |
2025 Q4
2 quarters
|
|
5631
CALL
Chemed
CHE
$6.9B
| $93.1K | ﹤0.01% |
200
-100
| -33% | -$42K |
2026 Q1
1 quarter
|
|
5632
CALL
U-Haul Holding Co Series N
UHAL.B
$9.5B
| $93.1K | ﹤0.01% |
1,600
+1,100
| +220% | +$54.8K |
2026 Q1
1 quarter
|
|
5633
CALL
Jones Lang LaSalle
JLL
$15.8B
| $93K | ﹤0.01% |
300
-1,700
| -85% | -$528K |
2018 Q1
33 quarters
|
|
5634
Liberty Capital Corp Series C GCI Group Common Stock
GLIBK
$870M
| $92.8K | ﹤0.01% |
+4,304
| New | +$121K |
2026 Q2
0 quarters
|
|
5635
Solid Biosciences
SLDB
$702M
| $92.8K | ﹤0.01% |
9,285
-5,812
| -38% | -$44.1K |
2025 Q3
3 quarters
|
|
5636
iShares Russell Top 200 Growth ETF
IWY
$15.6B
| $92.7K | ﹤0.01% |
319
+73
| +30% | +$20.6K |
2026 Q1
1 quarter
|
|
5637
PUT
Teucrium 2x Long Daily XRP ETF
XXRP
$116M
| $92.6K | ﹤0.01% |
+4,500
| New | +$158K |
2026 Q2
0 quarters
|
|
5638
PUT
Ellington Financial
EFC
$1.52B
| $92.5K | ﹤0.01% |
6,800
+5,800
| +580% | +$76.8K |
2017 Q3
35 quarters
|
|
5639
Vivmark Residential
VMRK
$47.3B
| $92.5K | ﹤0.01% |
1,362
-3,678
| -73% | -$238K |
2025 Q3
3 quarters
|
|
5640
PUT
Dana Inc
DAN
$2.61B
| $92.5K | ﹤0.01% |
3,400
| – | – |
2018 Q1
33 quarters
|
|
5641
Voyager Technologies
VOYG
$1.71B
| $92.5K | ﹤0.01% |
+2,867
| New | +$99.2K |
2026 Q2
0 quarters
|
|
5642
News Corp Class A
NWSA
$15.9B
| $92.4K | ﹤0.01% |
3,722
-2,850
| -43% | -$73.8K |
2025 Q4
2 quarters
|
|
5643
Safe Bulkers
SB
$914M
| $92.4K | ﹤0.01% |
14,643
+14,546
| +14,996% | +$97.2K |
2026 Q1
1 quarter
|
|
5644
CALL
Axogen
AXGN
$2.92B
| $92.4K | ﹤0.01% |
+2,000
| New | +$80.6K |
2026 Q2
0 quarters
|
|
5645
GraniteShares 2x Long VRT Daily ETF
VRTL
$38.6M
| $92.4K | ﹤0.01% |
1,773
+1,077
| +155% | +$55.1K |
2025 Q3
3 quarters
|
|
5646
Ingredion
INGR
$5.99B
| $92.3K | ﹤0.01% |
975
+962
| +7,400% | +$102K |
2026 Q1
1 quarter
|
|
5647
Fox Factory Holding Corp
FOXF
$661M
| $92.3K | ﹤0.01% |
5,445
+5,339
| +5,037% | +$92.9K |
2026 Q1
1 quarter
|
|
5648
Warner Music
WMG
$15.4B
| $92.2K | ﹤0.01% |
+3,407
| New | +$101K |
2026 Q2
0 quarters
|
|
5649
OR Royalties Inc
OR
$6.21B
| $92.1K | ﹤0.01% |
+2,912
| New | +$108K |
2026 Q2
0 quarters
|
|
5650
CALL
aTyr Pharma
ATYR
$12.7M
| $92.1K | ﹤0.01% |
3,855
-33
| -0.8% | -$862 |
2024 Q4
6 quarters
|
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.