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 | |
|---|---|---|---|---|---|---|---|
6776
iShares Nasdaq Top 30 Stocks ETF
QTOP
$332M
| $29.2K | ﹤0.01% |
756
-136
| -15% | -$4.92K |
2024 Q4
6 quarters
|
|
6777
CALL
PennantPark Floating Rate Capital
PFLT
$633M
| $29.2K | ﹤0.01% |
3,900
+2,300
| +144% | +$19.1K |
2026 Q1
1 quarter
|
|
6778
CALL
TherapeuticsMD
TXMD
$20.8M
| $29.2K | ﹤0.01% |
13,200
+200
| +2% | +$413 |
2025 Q4
2 quarters
|
|
6779
SouthState Bank Corp
SSB
$10.2B
| $29.2K | ﹤0.01% |
292
-144
| -33% | -$13.9K |
2026 Q1
1 quarter
|
|
6780
iShares MSCI Global Gold Miners ETF
RING
$2.12B
| $29.1K | ﹤0.01% |
451
-584
| -56% | -$44.7K |
2025 Q3
3 quarters
|
|
6781
Aclaris Therapeutics
ACRS
$552M
| $29.1K | ﹤0.01% |
5,499
-5,717
| -51% | -$25.5K |
2025 Q4
2 quarters
|
|
6782
Nano Nuclear Energy
NNE
$653M
| $29.1K | ﹤0.01% |
1,375
-24,097
| -95% | -$594K |
2026 Q1
1 quarter
|
|
6783
OneSpaWorld
OSW
$2.42B
| $29.1K | ﹤0.01% |
1,029
+701
| +214% | +$17.3K |
2026 Q1
1 quarter
|
|
6784
Ryder
R
$10.4B
| $29K | ﹤0.01% |
110
-199
| -64% | -$48.6K |
2024 Q4
6 quarters
|
|
6785
iShares MSCI Turkey ETF
TUR
$147M
| $29K | ﹤0.01% |
745
-4,353
| -85% | -$177K |
2025 Q4
2 quarters
|
|
6786
KNOT Offshore Partners
KNOP
$355M
| $28.9K | ﹤0.01% |
2,896
-83,446
| -97% | -$887K |
2025 Q3
3 quarters
|
|
6787
Invesco Mortgage Capital
IVR
$604M
| $28.9K | ﹤0.01% |
3,655
-12,568
| -77% | -$101K |
2026 Q1
1 quarter
|
|
6788
CALL
Digimarc Corp
DMRC
$164M
| $28.8K | ﹤0.01% |
3,500
+3,400
| +3,400% | +$31.9K |
2025 Q4
2 quarters
|
|
6789
CALL
UMH Properties
UMH
$1.32B
| $28.8K | ﹤0.01% |
1,900
-1,000
| -34% | -$15.3K |
2020 Q3
23 quarters
|
|
6790
iShares US Infrastructure ETF
IFRA
$3.98B
| $28.7K | ﹤0.01% |
+456
| New | +$27.8K |
2026 Q2
0 quarters
|
|
6791
iShares MSCI Singapore ETF
EWS
$1.13B
| $28.7K | ﹤0.01% |
969
+679
| +234% | +$19.8K |
2025 Q4
2 quarters
|
|
6792
RF Industries
RFIL
$74.8M
| $28.7K | ﹤0.01% |
1,352
-4,765
| -78% | -$77.1K |
2026 Q1
1 quarter
|
|
6793
Summit Therapeutics
SMMT
$12.3B
| $28.7K | ﹤0.01% |
1,968
-6,442
| -77% | -$114K |
2026 Q1
1 quarter
|
|
6794
CALL
Seritage Growth Properties
SRG
$91.2M
| $28.7K | ﹤0.01% |
10,900
-98,900
| -90% | -$260K |
2016 Q4
38 quarters
|
|
6795
PUT
AAR Corp
AIR
$3.83B
| $28.6K | ﹤0.01% |
200
-5,300
| -96% | -$626K |
2025 Q3
3 quarters
|
|
6796
PUT
Lexicon Pharmaceuticals
LXRX
$632M
| $28.6K | ﹤0.01% |
11,900
+5,600
| +89% | +$10.9K |
2025 Q3
3 quarters
|
|
6797
PUT
Cinemark Holdings
CNK
$4.6B
| $28.6K | ﹤0.01% |
900
+800
| +800% | +$23.7K |
2021 Q2
20 quarters
|
|
6798
CALL
Canada Goose Holdings
GOOS
$787M
| $28.5K | ﹤0.01% |
3,000
+2,700
| +900% | +$28.5K |
2017 Q2
36 quarters
|
|
6799
PUT
Archrock
AROC
$5.11B
| $28.5K | ﹤0.01% |
700
-1,600
| -70% | -$58.9K |
2018 Q4
30 quarters
|
|
6800
CALL
Evolus
EOLS
$463M
| $28.5K | ﹤0.01% |
4,100
+3,400
| +486% | +$20.1K |
2025 Q3
3 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.