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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6851
PUT
Lincoln Electric
LECO
$13.7B
| $92K | ﹤0.01% |
700
+699
| +69,900% | +$89.5K |
|
6852
CALL
OFG Bancorp
OFG
$2.22B
| $92K | ﹤0.01% |
4,200
+4,199
| +419,900% | +$99.8K |
|
6853
Sunstone Hotel Investors
SHO
$2.18B
| $92K | ﹤0.01% |
7,412
+5,340
| +258% | +$68K |
|
6854
CALL
NextTrip
NTRP
$24.3M
| $92K | ﹤0.01% |
1,190
+1,184
| +19,733% | +$87.7K |
|
|
MMAT
6855
DELISTED
Meta Materials Inc. Common Stock
MMAT
| $92K | ﹤0.01% |
+124
| New | +$69.2K |
|
|
BKEP
6856
DELISTED
Blueknight Energy Partners L.P.
BKEP
| $92K | ﹤0.01% |
24,352
+12,257
| +101% | +$44K |
|
|
RRD
6857
CALL
DELISTED
RR Donnelley & Sons Co.
RRD
| $92K | ﹤0.01% |
+14,700
| New | +$80.2K |
|
|
ALXN
6858
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $92K | ﹤0.01% |
4,600
+4,512
| +5,127% | +$775K |
|
6859
CALL
Broadwind
BWEN
$91.3M
| $91K | ﹤0.01% |
20,300
+20,223
| +26,264% | +$99.4K |
|
6860
Cheniere Energy
CQP
$31.5B
| $91K | ﹤0.01% |
2,055
+1,129
| +122% | +$47.5K |
|
6861
PUT
MiMedx Group
MDXG
$622M
| $91K | ﹤0.01% |
7,300
+6,982
| +2,196% | +$75.6K |
|
|
MESO
6862
CALL
Mesoblast
MESO
$1.89B
| $91K | ﹤0.01% |
6,100
+6,025
| +8,033% | +$94.6K |
|
|
NAK
6863
Northern Dynasty Minerals
NAK
$779M
| $91K | ﹤0.01% |
185,982
-111,928
| -38% | -$63.2K |
|
6864
PUT
CarParts.com
PRTS
$42.4M
| $91K | ﹤0.01% |
450
+426
| +1,775% | +$71.3K |
|
|
TMQ
6865
PUT
Trilogy Metals
TMQ
$549M
| $91K | ﹤0.01% |
36,300
+36,058
| +14,900% | +$90.8K |
|
|
YRD
6866
PUT
Yiren Digital
YRD
$98M
| $91K | ﹤0.01% |
15,200
+15,198
| +759,900% | +$65.2K |
|
|
KRTX
6867
CALL
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $91K | ﹤0.01% |
800
+781
| +4,111% | +$91.3K |
|
|
HARP
6868
CALL
DELISTED
Harpoon Therapeutics, Inc. Common Stock
HARP
| $91K | ﹤0.01% |
660
+659
| +65,900% | +$126K |
|
6869
Arbutus Biopharma
ABUS
$871M
| $90K | ﹤0.01% |
29,794
+13,839
| +87% | +$42.9K |
|
6870
PUT
Advanced Energy
AEIS
$11B
| $90K | ﹤0.01% |
800
+793
| +11,329% | +$84K |
|
|
ASRT
6871
CALL
DELISTED
Assertio
ASRT
| $90K | ﹤0.01% |
3,893
+3,884
| +43,156% | +$112K |
|
6872
Globus Medical
GMED
$10.9B
| $90K | ﹤0.01% |
1,171
-1,855
| -61% | -$132K |
|
6873
CALL
Highwoods Properties
HIW
$3.73B
| $90K | ﹤0.01% |
+2,000
| New | +$90K |
|
6874
CALL
Insteel Industries
IIIN
$593M
| $90K | ﹤0.01% |
+2,800
| New | +$96.8K |
|
|
LPRO
6875
PUT
Open Lending Corp
LPRO
$372M
| $90K | ﹤0.01% |
2,100
+1,884
| +872% | +$72.4K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.