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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 | |
|---|---|---|---|---|---|---|---|
5201
ProShares UltraShort Euro
EUO
$45.7M
| $134K | ﹤0.01% |
+4,377
| New | +$129K |
2026 Q2
0 quarters
|
|
5202
Delek US
DK
$4.35B
| $134K | ﹤0.01% |
2,637
+375
| +17% | +$16.6K |
2024 Q4
6 quarters
|
|
5203
PUT
Neumora Therapeutics
NMRA
$73M
| $134K | ﹤0.01% |
78,800
-62,300
| -44% | -$119K |
2025 Q3
3 quarters
|
|
5204
CALL
Algonquin Power & Utilities
AQN
$4.18B
| $134K | ﹤0.01% |
22,800
-800
| -3% | -$4.86K |
2021 Q1
21 quarters
|
|
5205
Allstate
ALL
$64.7B
| $133K | ﹤0.01% |
+561
| New | +$122K |
2026 Q2
0 quarters
|
|
5206
Newsmax Inc
NMAX
$1.05B
| $133K | ﹤0.01% |
16,113
-8,048
| -33% | -$57.7K |
2025 Q2
4 quarters
|
|
5207
DELISTED
National Storage Affiliates Trust
NSA
| $133K | ﹤0.01% |
3,000
-2,216
| -42% | -$95K |
2026 Q1
1 quarter
|
|
5208
CALL
Voyager Therapeutics
VYGR
$108M
| $133K | ﹤0.01% |
38,100
+22,500
| +144% | +$85.3K |
2018 Q1
33 quarters
|
|
5209
PUT
FerroAtlántica
GSM
$749M
| $133K | ﹤0.01% |
41,900
+22,300
| +114% | +$92.3K |
2020 Q4
22 quarters
|
|
5210
Ecovyst
ECVT
$1.12B
| $133K | ﹤0.01% |
10,694
-17,767
| -62% | -$241K |
2026 Q1
1 quarter
|
|
5211
PUT
Dine Brands
DIN
$445M
| $133K | ﹤0.01% |
3,700
-1,100
| -23% | -$32.9K |
2018 Q1
33 quarters
|
|
5212
Autodesk
ADSK
$50.5B
| $133K | ﹤0.01% |
+683
| New | +$156K |
2026 Q2
0 quarters
|
|
5213
PUT
Spire
SR
$5.13B
| $133K | ﹤0.01% |
+1,700
| New | +$146K |
2026 Q2
0 quarters
|
|
5214
ProShares Ultra Bitcoin ETF
BITU
$535M
| $133K | ﹤0.01% |
16,343
+12,795
| +361% | +$163K |
2026 Q1
1 quarter
|
|
5215
CALL
Aris Mining
ARIS
$3.28B
| $133K | ﹤0.01% |
8,900
-44,200
| -83% | -$794K |
2025 Q2
4 quarters
|
|
5216
PUT
Safe Bulkers
SB
$924M
| $133K | ﹤0.01% |
21,000
+20,900
| +20,900% | +$140K |
2025 Q4
2 quarters
|
|
5217
CALL
UroGen Pharma
URGN
$1.64B
| $132K | ﹤0.01% |
3,600
-6,900
| -66% | -$187K |
2022 Q3
15 quarters
|
|
5218
Direxion Daily MSCI Emerging Markets Bull 3X ETF
EDC
$123M
| $132K | ﹤0.01% |
1,487
+57
| +4% | +$4.67K |
2025 Q3
3 quarters
|
|
5219
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$40.3M
| $132K | ﹤0.01% |
3,167
+38
| +1% | +$1.31K |
2025 Q4
2 quarters
|
|
5220
CALL
Prelude Therapeutics
PRLD
$327M
| $132K | ﹤0.01% |
24,800
+19,200
| +343% | +$83.6K |
2025 Q4
2 quarters
|
|
|
5221
PUT
Prelude Therapeutics
PRLD
$327M
| $132K | ﹤0.01% |
24,800
+24,100
| +3,443% | +$105K |
2025 Q4
2 quarters
|
|
5222
PUT
ArriVent BioPharma
AVBP
$786M
| $132K | ﹤0.01% |
3,800
-46,200
| -92% | -$1.36M |
2025 Q3
3 quarters
|
|
5223
PUT
NOV
NOV
$6.9B
| $132K | ﹤0.01% |
7,100
+6,400
| +914% | +$128K |
2014 Q4
46 quarters
|
|
5224
Karman Holdings
KRMN
$5.53B
| $132K | ﹤0.01% |
+2,636
| New | +$170K |
2026 Q2
0 quarters
|
|
5225
CALL
Imperial Petroleum
IMPP
$232M
| $131K | ﹤0.01% |
28,500
-101,700
| -78% | -$494K |
2022 Q1
17 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.