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 | |
|---|---|---|---|---|---|---|
5776
CALL
Cartesian Therapeutics
RNAC
$229M
| $188K | ﹤0.01% |
1,507
+1,503
| +37,575% | +$179K |
|
5777
CALL
Universal Corp
UVV
$1.31B
| $188K | ﹤0.01% |
3,300
+3,277
| +14,248% | +$189K |
|
5778
ZTO Express
ZTO
$18.3B
| $188K | ﹤0.01% |
6,215
-8,158
| -57% | -$252K |
|
5779
CALL
Assurant
AIZ
$13.8B
| $187K | ﹤0.01% |
1,200
+1,088
| +971% | +$170K |
|
5780
PUT
Arlo Technologies
ARLO
$1.6B
| $187K | ﹤0.01% |
27,700
+27,501
| +13,820% | +$179K |
|
5781
PUT
Cabot Corp
CBT
$4.54B
| $187K | ﹤0.01% |
3,300
+3,276
| +13,650% | +$192K |
|
5782
Diana Shipping
DSX
$302M
| $187K | ﹤0.01% |
51,560
+25,561
| +98% | +$74.8K |
|
5783
iShares MSCI Emerging Markets ex China ETF
EMXC
$23.5B
| $187K | ﹤0.01% |
+3,012
| New | +$185K |
|
5784
CALL
Kirby Corp
KEX
$7.01B
| $187K | ﹤0.01% |
3,100
+3,087
| +23,746% | +$199K |
|
5785
abrdn Physical Gold Shares ETF
SGOL
$6.91B
| $187K | ﹤0.01% |
11,020
-10,000
| -48% | -$174K |
|
|
CDMO
5786
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $187K | ﹤0.01% |
7,295
+5,456
| +297% | +$117K |
|
|
LTCH
5787
PUT
DELISTED
Latch, Inc. Common Stock
LTCH
| $187K | ﹤0.01% |
15,300
+15,199
| +15,049% | +$165K |
|
|
FRC
5788
PUT
DELISTED
First Republic Bank
FRC
| $187K | ﹤0.01% |
1,000
+907
| +975% | +$167K |
|
|
SBBP
5789
CALL
DELISTED
Strongbridge Biopharma plc.
SBBP
| $187K | ﹤0.01% |
63,000
+62,754
| +25,510% | +$166K |
|
|
TBIO
5790
PUT
DELISTED
Translate Bio, Inc. Common Stock
TBIO
| $187K | ﹤0.01% |
6,800
+6,539
| +2,505% | +$129K |
|
|
CIO
5791
PUT
DELISTED
City Office REIT
CIO
| $186K | ﹤0.01% |
15,000
+14,899
| +14,751% | +$173K |
|
5792
CALL
Clean Harbors
CLH
$16.5B
| $186K | ﹤0.01% |
2,000
+1,988
| +16,567% | +$181K |
|
5793
PUT
Dycom Industries
DY
$12B
| $186K | ﹤0.01% |
2,500
+2,496
| +62,400% | +$215K |
|
5794
FTI Consulting
FCN
$4.4B
| $186K | ﹤0.01% |
1,364
-856
| -39% | -$120K |
|
|
GTY
5795
PUT
Getty Realty Corp
GTY
$2.11B
| $186K | ﹤0.01% |
6,000
+5,998
| +299,900% | +$187K |
|
5796
PUT
Kartoon Studios
TOON
$35.2M
| $186K | ﹤0.01% |
10,110
+9,731
| +2,568% | +$170K |
|
|
TURN
5797
CALL
DELISTED
180 Degree Capital
TURN
| $186K | ﹤0.01% |
23,100
+22,522
| +3,897% | +$174K |
|
|
GPUS
5798
CALL
Hyperscale Data Inc
GPUS
$55.4M
| – | – |
0
| – | – |
|
|
LUNA
5799
CALL
DELISTED
Luna Innovations Incorporated
LUNA
| $186K | ﹤0.01% |
17,200
+17,045
| +10,997% | +$186K |
|
5800
Arrow Electronics
ARW
$11.1B
| $185K | ﹤0.01% |
1,631
-3,037
| -65% | -$356K |
|
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.