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 | |
|---|---|---|---|---|---|---|
|
BIOC
7901
CALL
DELISTED
Biocept, Inc.
BIOC
| $41K | ﹤0.01% |
327
+324
| +10,800% | +$43.9K |
|
|
EQOS
7902
DELISTED
EQONEX LIMITED Ordinary Shares
EQOS
| $41K | ﹤0.01% |
6,403
-2,245
| -26% | -$15.6K |
|
|
NTUS
7903
CALL
DELISTED
Natus Medical Inc
NTUS
| $41K | ﹤0.01% |
1,600
+1,546
| +2,863% | +$42.1K |
|
|
RNWK
7904
PUT
DELISTED
RealNetworks Inc
RNWK
| $41K | ﹤0.01% |
17,700
+17,286
| +4,175% | +$50.4K |
|
7905
CALL
Applied Optoelectronics
AAOI
$7.07B
| $40K | ﹤0.01% |
4,800
+4,696
| +4,515% | +$38.2K |
|
7906
Asbury Automotive
ABG
$4.49B
| $40K | ﹤0.01% |
237
-3,334
| -93% | -$641K |
|
|
ADAP
7907
PUT
DELISTED
Adaptimmune Therapeutics
ADAP
| $40K | ﹤0.01% |
9,400
+9,159
| +3,800% | +$44.5K |
|
7908
CALL
Clearwater Paper
CLW
$282M
| $40K | ﹤0.01% |
1,400
+1,392
| +17,400% | +$43.5K |
|
7909
CALL
Century Casinos
CNTY
$32.6M
| $40K | ﹤0.01% |
+3,000
| New | +$39.2K |
|
7910
PUT
e.l.f. Beauty
ELF
$4.96B
| $40K | ﹤0.01% |
1,500
+1,437
| +2,281% | +$41.1K |
|
|
TDAY
7911
PUT
USA Today Co
TDAY
$1.27B
| $40K | ﹤0.01% |
+7,300
| New | +$37.3K |
|
7912
The GEO Group
GEO
$4.11B
| $40K | ﹤0.01% |
+5,740
| New | +$36.1K |
|
7913
Houlihan Lokey
HLI
$10.2B
| $40K | ﹤0.01% |
+499
| New | +$36.1K |
|
7914
Korn Ferry
KFY
$4.26B
| $40K | ﹤0.01% |
561
-264
| -32% | -$17.6K |
|
7915
CALL
Lesaka Technologies
LSAK
$392M
| $40K | ﹤0.01% |
+8,500
| New | +$44.3K |
|
7916
PUT
Mativ Holdings
MATV
$482M
| $40K | ﹤0.01% |
1,000
+948
| +1,823% | +$42.3K |
|
7917
CALL
RAVE Restaurant Group
RAVE
$43.9M
| $40K | ﹤0.01% |
27,500
+27,379
| +22,627% | +$37.9K |
|
7918
PUT
Reading International Class A
RDI
$33.2M
| $40K | ﹤0.01% |
5,800
+5,722
| +7,336% | +$36.2K |
|
7919
CALL
Tucows
TCX
$101M
| $40K | ﹤0.01% |
500
+399
| +395% | +$31.6K |
|
7920
CALL
Teleflex
TFX
$5.94B
| $40K | ﹤0.01% |
+100
| New | +$41K |
|
7921
PUT
FlexShares Morningstar US Market Factors Tilt Index Fund
TILT
$2.18B
| $40K | ﹤0.01% |
1,100
+1,093
| +15,614% | +$183K |
|
7922
PUT
Telos
TLS
$344M
| $40K | ﹤0.01% |
1,200
+1,190
| +11,900% | +$40.1K |
|
|
TRIB
7923
CALL
Trinity Biotech
TRIB
$8.4M
| $40K | ﹤0.01% |
+91
| New | +$45.4K |
|
7924
CALL
Vivani Medical
VANI
$113M
| $40K | ﹤0.01% |
2,733
+2,723
| +27,230% | +$52.6K |
|
7925
CALL
WPP
WPP
$4.59B
| $40K | ﹤0.01% |
600
+596
| +14,900% | +$40.8K |
|
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.