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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 | |
|---|---|---|---|---|---|---|---|
5276
PUT
LeMaitre Vascular
LMAT
$1.91B
| $125K | ﹤0.01% |
+1,300
| New | +$133K |
2026 Q2
0 quarters
|
|
5277
Phillips 66
PSX
$109B
| $125K | ﹤0.01% |
+737
| New | +$127K |
2026 Q2
0 quarters
|
|
5278
CALL
Franklin International Core Dividend Tilt Index ETF
DIVI
$2.63B
| $125K | ﹤0.01% |
2,300
+1,600
| +229% | +$68K |
2024 Q3
7 quarters
|
|
5279
PUT
MarineMax
HZO
$1.16B
| $125K | ﹤0.01% |
3,400
+3,000
| +750% | +$96.4K |
2019 Q4
26 quarters
|
|
5280
Pershing Square
PS
$18.6B
| $124K | ﹤0.01% |
+3,783
| New | +$138K |
2026 Q2
0 quarters
|
|
5281
CALL
Gladstone Capital
GLAD
$430M
| $124K | ﹤0.01% |
6,400
-5,100
| -44% | -$96.7K |
2019 Q2
28 quarters
|
|
5282
CALL
REalloys Inc
ALOY
$466M
| $124K | ﹤0.01% |
+8,600
| New | +$98K |
2026 Q2
0 quarters
|
|
5283
PUT
American Homes 4 Rent
AMH
$11.4B
| $124K | ﹤0.01% |
3,700
+3,500
| +1,750% | +$111K |
2023 Q2
12 quarters
|
|
5284
CALL
Trupanion
TRUP
$1.34B
| $124K | ﹤0.01% |
5,000
+4,600
| +1,150% | +$112K |
2018 Q1
33 quarters
|
|
5285
CALL
NET Power
NPWR
$71.7M
| $124K | ﹤0.01% |
74,000
-38,100
| -34% | -$69K |
2023 Q4
10 quarters
|
|
5286
CALL
United States Gasoline Fund
UGA
$168M
| $124K | ﹤0.01% |
1,200
+400
| +50% | +$43.3K |
2017 Q2
36 quarters
|
|
5287
PUT
Carter's
CRI
$1.18B
| $123K | ﹤0.01% |
3,000
+1,900
| +173% | +$71.9K |
2017 Q3
35 quarters
|
|
5288
Direxion Daily AVGO Bull 2X ETF
AVL
$236M
| $123K | ﹤0.01% |
2,793
+772
| +38% | +$41.1K |
2025 Q4
2 quarters
|
|
5289
Roundhill HOOD WeeklyPay ETF
HOOW
$98.1M
| $123K | ﹤0.01% |
4,342
-2,298
| -35% | -$58.4K |
2025 Q4
2 quarters
|
|
5290
CALL
Takeda Pharmaceutical
TAK
$66.7B
| $123K | ﹤0.01% |
7,700
+5,700
| +285% | +$94.3K |
2026 Q1
1 quarter
|
|
|
BZH
5291
PUT
DELISTED
Beazer Homes USA
BZH
| $123K | ﹤0.01% |
4,400
-5,300
| -55% | -$125K |
2018 Q2
32 quarters
|
|
5292
PUT
Spero Therapeutics
SPRO
$64.1M
| $123K | ﹤0.01% |
55,800
+22,600
| +68% | +$59.1K |
2025 Q1
5 quarters
|
|
5293
Power Solutions International
PSIX
$1.05B
| $123K | ﹤0.01% |
+3,170
| New | +$174K |
2026 Q2
0 quarters
|
|
5294
PUT
O-I Glass
OI
$787M
| $123K | ﹤0.01% |
12,800
+12,600
| +6,300% | +$119K |
2018 Q2
32 quarters
|
|
5295
PIMCO 15+ Year US TIPS Index Exchange-Traded Fund
LTPZ
$1.13B
| $123K | ﹤0.01% |
2,431
+2,372
| +4,020% | +$121K |
2025 Q4
2 quarters
|
|
5296
Rogers Communications
RCI
$17.6B
| $123K | ﹤0.01% |
+3,784
| New | +$137K |
2026 Q2
0 quarters
|
|
5297
CALL
Cousins Properties
CUZ
$4.79B
| $123K | ﹤0.01% |
4,100
-2,600
| -39% | -$68.2K |
2025 Q4
2 quarters
|
|
5298
CALL
BlackRock US Equity Factor Rotation ETF
DYNF
$41.7B
| $123K | ﹤0.01% |
2,400
-2,900
| -55% | -$189K |
2026 Q1
1 quarter
|
|
5299
Wipro
WIT
$21.3B
| $123K | ﹤0.01% |
+54,554
| New | +$116K |
2026 Q2
0 quarters
|
|
5300
PUT
Kennametal
KMT
$2.25B
| $123K | ﹤0.01% |
3,500
-1,400
| -29% | -$51K |
2026 Q1
1 quarter
|
|
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.