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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 | |
|---|---|---|---|---|---|---|---|
5701
Invesco CurrencyShares Australian Dollar Trust
FXA
$94.4M
| $88.8K | ﹤0.01% |
1,295
-2,382
| -65% | -$168K |
2026 Q1
1 quarter
|
|
5702
CALL
VEON
VEON
$6.04B
| $88.8K | ﹤0.01% |
1,700
+1,400
| +467% | +$73K |
2024 Q2
8 quarters
|
|
|
FMDG
5703
PUT
DELISTED
Fieldstone Merlin Dynamic Large Cap Growth ETF
FMDG
| $88.6K | ﹤0.01% |
+2,100
| New | +$88.6K |
2026 Q2
0 quarters
|
|
5704
Marsh
MRSH
$91.4B
| $88.5K | ﹤0.01% |
531
-1,362
| -72% | -$228K |
2025 Q4
2 quarters
|
|
5705
CALL
Adient
ADNT
$1.33B
| $88.2K | ﹤0.01% |
+4,800
| New | +$103K |
2026 Q2
0 quarters
|
|
5706
PUT
Grid Dynamics Holdings
GDYN
$710M
| $88K | ﹤0.01% |
+15,500
| New | +$95.9K |
2026 Q2
0 quarters
|
|
5707
Procept Biorobotics
PRCT
$1.16B
| $87.9K | ﹤0.01% |
3,895
-12,830
| -77% | -$321K |
2025 Q1
5 quarters
|
|
5708
PUT
Silence Therapeutics
SLN
$1.23B
| $87.8K | ﹤0.01% |
8,000
+3,000
| +60% | +$21.1K |
2025 Q2
4 quarters
|
|
5709
CALL
Outset Medical
OM
$81.6M
| $87.7K | ﹤0.01% |
20,300
+17,800
| +712% | +$77.9K |
2023 Q3
11 quarters
|
|
5710
Hornbeck Offshore Services, Inc.
HOS
$2.32B
| $87.7K | ﹤0.01% |
10,029
-37,657
| -79% | -$362K |
2026 Q1
1 quarter
|
|
5711
CALL
HCI Group
HCI
$2.43B
| $87.6K | ﹤0.01% |
500
-800
| -62% | -$126K |
2025 Q2
4 quarters
|
|
5712
PUT
HUB Group
HUBG
$1.61B
| $87.6K | ﹤0.01% |
2,000
-6,600
| -77% | -$277K |
2023 Q3
11 quarters
|
|
5713
CALL
Candel Therapeutics
CADL
$663M
| $87.6K | ﹤0.01% |
8,500
-31,900
| -79% | -$241K |
2024 Q2
8 quarters
|
|
5714
PUT
OSI Systems
OSIS
$3.16B
| $87.5K | ﹤0.01% |
400
-700
| -64% | -$171K |
2025 Q1
5 quarters
|
|
5715
CALL
Oculis Holding
OCS
$491M
| $87.4K | ﹤0.01% |
+6,300
| New | +$143K |
2026 Q2
0 quarters
|
|
5716
CALL
DELISTED
Talkspace
TALK
| $87.4K | ﹤0.01% |
16,800
-12,300
| -42% | -$63.9K |
2023 Q2
12 quarters
|
|
5717
GraniteShares 2x Long MSFT Daily ETF
MSFL
$56.4M
| $87.3K | ﹤0.01% |
5,937
+3,464
| +140% | +$61.8K |
2025 Q4
2 quarters
|
|
5718
CALL
Covista Inc
CVSA
$4.28B
| $87.3K | ﹤0.01% |
700
+600
| +600% | +$72.3K |
2025 Q4
2 quarters
|
|
5719
PUT
Armour Residential REIT
ARR
$1.79B
| $87.2K | ﹤0.01% |
5,000
-195,100
| -98% | -$3.36M |
2018 Q2
32 quarters
|
|
5720
CALL
Neumora Therapeutics
NMRA
$73.9M
| $87.2K | ﹤0.01% |
51,300
-8,400
| -14% | -$16K |
2023 Q4
10 quarters
|
|
5721
Manhattan Associates
MANH
$13.9B
| $87.2K | ﹤0.01% |
626
+624
| +31,200% | +$86K |
2025 Q4
2 quarters
|
|
5722
CALL
Moonvest ETF
MNVT
$63.4M
| $87.2K | ﹤0.01% |
2,400
-5,800
| -71% | -$166K |
2026 Q1
1 quarter
|
|
5723
PUT
Karyopharm Therapeutics
KPTI
$18.9M
| $87K | ﹤0.01% |
8,900
-148,000
| -94% | -$1.28M |
2025 Q3
3 quarters
|
|
5724
Teledyne Technologies
TDY
$30.9B
| $86.7K | ﹤0.01% |
130
+96
| +282% | +$60.5K |
2026 Q1
1 quarter
|
|
5725
PUT
WisdomTree US Total Dividend Fund
DTD
$1.67B
| $86.5K | ﹤0.01% |
800
+100
| +14% | +$9.13K |
2014 Q4
46 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.