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 | |
|---|---|---|---|---|---|---|---|
6651
AMC Global Media
AMCX
$347M
| $33.9K | ﹤0.01% |
3,394
-2,002
| -37% | -$17.8K |
2024 Q1
9 quarters
|
|
6652
Strategic Education
STRA
$1.79B
| $33.9K | ﹤0.01% |
442
-123
| -22% | -$9.7K |
2025 Q4
2 quarters
|
|
6653
CALL
Allison Transmission
ALSN
$8.94B
| $33.8K | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
6654
CALL
DELISTED
ACV Auctions
ACVA
| $33.8K | ﹤0.01% |
4,700
+2,600
| +124% | +$14.7K |
2021 Q2
20 quarters
|
|
6655
ARS Pharmaceuticals
SPRY
$398M
| $33.8K | ﹤0.01% |
+4,218
| New | +$36.3K |
2026 Q2
0 quarters
|
|
6656
CALL
York Water
YORW
$516M
| $33.7K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$30K |
2025 Q1
5 quarters
|
|
6657
Asure Software
ASUR
$210M
| $33.6K | ﹤0.01% |
4,235
-66
| -2% | -$575 |
2025 Q1
5 quarters
|
|
6658
PUT
Claros Mortgage Trust
CMTG
$171M
| $33.6K | ﹤0.01% |
14,300
-2,400
| -14% | -$5.89K |
2025 Q3
3 quarters
|
|
6659
ASA Gold and Precious Metals
ASA
$903M
| $33.6K | ﹤0.01% |
+645
| New | +$40.4K |
2026 Q2
0 quarters
|
|
6660
PUT
Interparfums
IPAR
$3.7B
| $33.6K | ﹤0.01% |
300
| – | – |
2024 Q3
7 quarters
|
|
6661
CALL
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.48B
| $33.5K | ﹤0.01% |
+100
| New | +$28.6K |
2026 Q2
0 quarters
|
|
6662
Kirby Corp
KEX
$7.09B
| $33.4K | ﹤0.01% |
+246
| New | +$35.2K |
2026 Q2
0 quarters
|
|
6663
PUT
Marsh
MRSH
$92.2B
| $33.3K | ﹤0.01% |
200
-4,300
| -96% | -$719K |
2017 Q2
36 quarters
|
|
6664
PUT
Grandstand Ltd
GRSD
$42.7M
| $33.2K | ﹤0.01% |
17,500
+15,800
| +929% | +$49.2K |
2025 Q2
4 quarters
|
|
6665
PUT
Sabre
SABR
$605M
| $33.2K | ﹤0.01% |
15,900
+13,100
| +468% | +$23K |
2018 Q1
33 quarters
|
|
6666
CALL
Life360
LIF
$3.56B
| $33.2K | ﹤0.01% |
600
-800
| -57% | -$35.6K |
2025 Q2
4 quarters
|
|
6667
CALL
OceanFirst Financial
OCFC
$1.61B
| $33.2K | ﹤0.01% |
1,700
+1,400
| +467% | +$26.1K |
2025 Q4
2 quarters
|
|
6668
PUT
Horizon Technology Finance
HRZN
$264M
| $33.1K | ﹤0.01% |
7,000
-1,500
| -18% | -$6.49K |
2019 Q2
28 quarters
|
|
6669
Myriad Genetics
MYGN
$566M
| $33.1K | ﹤0.01% |
+5,792
| New | +$26.3K |
2026 Q2
0 quarters
|
|
6670
StealthGas
GASS
$308M
| $33K | ﹤0.01% |
4,178
-26,771
| -87% | -$252K |
2025 Q4
2 quarters
|
|
6671
Beam Global
BEEM
$20.6M
| $33K | ﹤0.01% |
25,371
+11,617
| +84% | +$17.8K |
2026 Q1
1 quarter
|
|
6672
CALL
KNOT Offshore Partners
KNOP
$348M
| $32.9K | ﹤0.01% |
3,300
-7,300
| -69% | -$77.6K |
2024 Q1
9 quarters
|
|
6673
CALL
Carter's
CRI
$1.17B
| $32.9K | ﹤0.01% |
800
-400
| -33% | -$15.1K |
2025 Q1
5 quarters
|
|
6674
PUT
iShares MSCI Emerging Markets Quality Factor ETF
EQLT
$11M
| $32.9K | ﹤0.01% |
1,000
-800
| -44% | -$30.1K |
2024 Q4
6 quarters
|
|
6675
PUT
Telefônica Brasil
VIV
$17.9B
| $32.9K | ﹤0.01% |
+2,500
| New | +$36.5K |
2026 Q2
0 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.