Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
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 | |
|---|---|---|---|---|---|---|---|
8076
Schwab US Mid-Cap ETF
SCHM
$14.7B
| $5.82K | ﹤0.01% |
158
+76
| +93% | +$2.62K |
2026 Q1
1 quarter
|
|
8077
PUT
IDT Corp
IDT
$2.08B
| $5.82K | ﹤0.01% |
+100
| New | +$5.29K |
2026 Q2
0 quarters
|
|
8078
Fidelity Momentum Factor ETF
FDMO
$835M
| $5.82K | ﹤0.01% |
+59
| New | +$5.42K |
2026 Q2
0 quarters
|
|
8079
Endava
DAVA
$115M
| $5.81K | ﹤0.01% |
+2,053
| New | +$7.57K |
2026 Q2
0 quarters
|
|
8080
BTCS Inc
BTCS
$57.7M
| $5.81K | ﹤0.01% |
5,231
+3,479
| +199% | +$5.61K |
2026 Q1
1 quarter
|
|
8081
RAVE Restaurant Group
RAVE
$31.3M
| $5.78K | ﹤0.01% |
1,769
+1,634
| +1,210% | +$4.64K |
2026 Q1
1 quarter
|
|
8082
PUT
Westwood Enhanced Income Opportunity ETF
YLDW
$36.4M
| $5.77K | ﹤0.01% |
+200
| New | +$5.09K |
2026 Q2
0 quarters
|
|
8083
PUT
Mercantile Bank Corp
MBWM
$1.04B
| $5.74K | ﹤0.01% |
+100
| New | +$5.27K |
2026 Q2
0 quarters
|
|
8084
PUT
Hudson Technologies
HDSN
$226M
| $5.74K | ﹤0.01% |
+1,000
| New | +$5.69K |
2026 Q2
0 quarters
|
|
8085
State Street SPDR Portfolio Long Term Corporate Bond ETF
SPLB
$1.2B
| $5.71K | ﹤0.01% |
255
+178
| +231% | +$3.97K |
2025 Q4
2 quarters
|
|
8086
PUT
Home BancShares
HOMB
$6.03B
| $5.71K | ﹤0.01% |
+200
| New | +$5.43K |
2026 Q2
0 quarters
|
|
8087
Vera Bradley
VRA
$176M
| $5.71K | ﹤0.01% |
1,468
-24,272
| -94% | -$89.6K |
2024 Q2
8 quarters
|
|
8088
CALL
Zai Lab
ZLAB
$2.47B
| $5.7K | ﹤0.01% |
300
-500
| -63% | -$9.9K |
2023 Q4
10 quarters
|
|
|
WSR
8089
PUT
DELISTED
Whitestone REIT
WSR
| $5.69K | ﹤0.01% |
+300
| New | +$5.64K |
2026 Q2
0 quarters
|
|
8090
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $5.69K | ﹤0.01% |
105,300
-44,100
| -30% | -$10.3K |
2021 Q2
20 quarters
|
|
8091
PUT
PCB Bancorp
PCB
$404M
| $5.67K | ﹤0.01% |
200
| – | – |
2026 Q1
1 quarter
|
|
8092
iShares US Treasury Bond ETF
GOVT
$42.5B
| $5.67K | ﹤0.01% |
249
-2,533
| -91% | -$57.7K |
2025 Q4
2 quarters
|
|
8093
PUT
OneSpaWorld
OSW
$2.47B
| $5.65K | ﹤0.01% |
+200
| New | +$4.94K |
2026 Q2
0 quarters
|
|
8094
Roundhill UNH WeeklyPay ETF
UNHW
$6.96M
| $5.65K | ﹤0.01% |
105
+10
| +11% | +$490 |
2026 Q1
1 quarter
|
|
8095
Morgan Stanley Bitcoin Trust
MSBT
| $5.64K | ﹤0.01% |
+335
| New | +$6.92K |
2026 Q2
0 quarters
|
|
8096
PUT
Lyell Immunopharma
LYEL
$230M
| $5.62K | ﹤0.01% |
400
| – | – |
2025 Q2
4 quarters
|
|
8097
PUT
Middlesex Water
MSEX
$1.05B
| $5.62K | ﹤0.01% |
100
-200
| -67% | -$10.5K |
2026 Q1
1 quarter
|
|
8098
Pliant Therapeutics
PLRX
$53.6M
| $5.61K | ﹤0.01% |
4,925
-43,129
| -90% | -$52.5K |
2023 Q3
11 quarters
|
|
8099
YieldMax CRCL Option Income Strategy ETF
CRCO
$30.8M
| $5.61K | ﹤0.01% |
+425
| New | +$8.92K |
2026 Q2
0 quarters
|
|
8100
CALL
Red Robin
RRGB
$165M
| $5.59K | ﹤0.01% |
700
-9,400
| -93% | -$41.7K |
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.