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 | |
|---|---|---|---|---|---|---|
|
UNIT
5751
Uniti Group
UNIT
$2.36B
| $191K | ﹤0.01% |
18,088
-25,537
| -59% | -$277K |
|
5752
PUT
Marriott Vacations Worldwide
VAC
$3.35B
| $191K | ﹤0.01% |
1,200
+1,177
| +5,117% | +$202K |
|
|
INFI
5753
DELISTED
Infinity Pharmaceuticals, Inc.
INFI
| $191K | ﹤0.01% |
63,911
+8,548
| +15% | +$27K |
|
|
CSII
5754
CALL
DELISTED
Cardiovascular Systems, Inc.
CSII
| $191K | ﹤0.01% |
4,500
+4,409
| +4,845% | +$172K |
|
|
VG
5755
PUT
DELISTED
Vonage Holdings Corporation
VG
| $191K | ﹤0.01% |
+13,300
| New | +$182K |
|
5756
PUT
Aviat Networks
AVNW
$265M
| $190K | ﹤0.01% |
+5,800
| New | +$202K |
|
5757
PUT
Babcock & Wilcox
BW
$1.39B
| $190K | ﹤0.01% |
24,200
+23,881
| +7,486% | +$197K |
|
5758
California Resources
CRC
$4.67B
| $190K | ﹤0.01% |
6,337
+4,697
| +286% | +$129K |
|
5759
CALL
Nektar Therapeutics
NKTR
$2.39B
| $190K | ﹤0.01% |
740
+721
| +3,795% | +$200K |
|
|
RDHL
5760
Redhill Biopharma
RDHL
$3.95M
| $190K | ﹤0.01% |
+28
| New | +$193K |
|
5761
Tronox
TROX
$932M
| $190K | ﹤0.01% |
8,521
-16,309
| -66% | -$358K |
|
5762
Advanced Drainage Systems
WMS
$10.6B
| $190K | ﹤0.01% |
1,634
-518
| -24% | -$57.5K |
|
|
TTCF
5763
DELISTED
Tattooed Chef, Inc Class A Common Stock
TTCF
| $190K | ﹤0.01% |
8,899
+8,399
| +1,680% | +$165K |
|
|
ELOX
5764
DELISTED
Eloxx Pharmaceuticals, Inc. Common Stock
ELOX
| $190K | ﹤0.01% |
+2,393
| New | +$200K |
|
5765
CGI
GIB
$15.1B
| $189K | ﹤0.01% |
2,093
+962
| +85% | +$85.3K |
|
5766
CALL
KNOT Offshore Partners
KNOP
$372M
| $189K | ﹤0.01% |
9,500
+9,421
| +11,925% | +$180K |
|
5767
PUT
Simply Good Foods
SMPL
$901M
| $189K | ﹤0.01% |
5,200
+5,109
| +5,614% | +$175K |
|
5768
CALL
Workiva
WK
$3.36B
| $189K | ﹤0.01% |
1,700
+1,695
| +33,900% | +$165K |
|
|
VRN
5769
CALL
DELISTED
Veren
VRN
| $189K | ﹤0.01% |
41,900
+41,705
| +21,387% | +$175K |
|
|
EPAY
5770
DELISTED
Bottomline Technologies Inc
EPAY
| $189K | ﹤0.01% |
5,117
-149
| -3% | -$6.14K |
|
5771
PUT
Brookfield Infrastructure Partners
BIP
$19.2B
| $188K | ﹤0.01% |
5,100
+5,056
| +11,491% | +$183K |
|
5772
CALL
Cognyte Software
CGNT
$659M
| $188K | ﹤0.01% |
7,700
+7,670
| +25,567% | +$190K |
|
|
EB
5773
CALL
DELISTED
Eventbrite
EB
| $188K | ﹤0.01% |
9,900
+9,746
| +6,329% | +$207K |
|
5774
CALL
Extreme Networks
EXTR
$3.94B
| $188K | ﹤0.01% |
16,900
+16,731
| +9,900% | +$178K |
|
5775
PubMatic
PUBM
$585M
| $188K | ﹤0.01% |
+4,821
| New | +$201K |
|
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.