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 | |
|---|---|---|---|---|---|---|
2751
PennyMac Financial
PFSI
$4.38B
| $1.3M | ﹤0.01% |
+21,075
| New | +$1.28M |
|
|
TEN
2752
PUT
DELISTED
Tenneco Inc. Class A Voting Common Stock
TEN
| $1.3M | ﹤0.01% |
67,300
+66,791
| +13,122% | +$1,000K |
|
2753
PUT
W.P. Carey
WPC
$17.1B
| $1.3M | ﹤0.01% |
17,765
+17,412
| +4,933% | +$1.27M |
|
2754
CALL
Ecolab
ECL
$75.6B
| $1.3M | ﹤0.01% |
6,300
+6,262
| +16,479% | +$1.36M |
|
2755
CALL
Guidewire Software
GWRE
$11.5B
| $1.3M | ﹤0.01% |
11,500
+11,433
| +17,064% | +$1.19M |
|
|
RAD
2756
CALL
DELISTED
Rite Aid Corporation
RAD
| $1.29M | ﹤0.01% |
+79,500
| New | +$1.52M |
|
|
SAVE
2757
DELISTED
Spirit Airlines, Inc.
SAVE
| $1.29M | ﹤0.01% |
42,486
+8,433
| +25% | +$296K |
|
2758
PUT
Culp Inc
CULP
$45M
| $1.29M | ﹤0.01% |
79,300
+79,104
| +40,359% | +$1.22M |
|
|
CAN
2759
PUT
Canaan Creative
CAN
$176M
| $1.29M | ﹤0.01% |
+158,500
| New | +$1.8M |
|
2760
Dropbox
DBX
$6.81B
| $1.29M | ﹤0.01% |
42,619
-41,547
| -49% | -$1.14M |
|
|
HA
2761
CALL
DELISTED
Hawaiian Holdings, Inc.
HA
| $1.29M | ﹤0.01% |
53,000
+52,433
| +9,247% | +$1.35M |
|
2762
PUT
Yelp
YELP
$1.38B
| $1.29M | ﹤0.01% |
+32,300
| New | +$1.28M |
|
2763
Weibo
WB
$1.9B
| $1.29M | ﹤0.01% |
24,507
+20,071
| +452% | +$994K |
|
2764
CALL
Omega Healthcare
OHI
$15.4B
| $1.29M | ﹤0.01% |
35,500
+35,103
| +8,842% | +$1.3M |
|
2765
PUT
UDR
UDR
$12.9B
| $1.29M | ﹤0.01% |
26,300
+26,093
| +12,605% | +$1.23M |
|
|
DMTK
2766
CALL
DELISTED
DermTech, Inc. Common Stock
DMTK
| $1.29M | ﹤0.01% |
31,000
+30,670
| +9,294% | +$1.26M |
|
2767
Marriott Vacations Worldwide
VAC
$3.24B
| $1.29M | ﹤0.01% |
8,075
+7,966
| +7,308% | +$1.36M |
|
|
VXRT
2768
PUT
DELISTED
Vaxart
VXRT
| $1.29M | ﹤0.01% |
171,700
+171,029
| +25,489% | +$1.19M |
|
2769
CALL
FTAI Aviation
FTAI
$22.2B
| $1.28M | ﹤0.01% |
+44,849
| New | +$1.13M |
|
2770
CALL
DTE Energy
DTE
$31.1B
| $1.28M | ﹤0.01% |
11,633
+11,559
| +15,620% | +$1.35M |
|
2771
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1.02B
| $1.28M | ﹤0.01% |
79,778
+34,448
| +76% | +$525K |
|
|
ZGNX
2772
PUT
DELISTED
Zogenix, Inc.
ZGNX
| $1.28M | ﹤0.01% |
74,200
+74,019
| +40,894% | +$1.36M |
|
2773
CALL
ABM Industries
ABM
$2.8B
| $1.28M | ﹤0.01% |
28,900
+28,872
| +103,114% | +$1.45M |
|
2774
Cardinal Health
CAH
$53.4B
| $1.28M | ﹤0.01% |
22,423
-13,243
| -37% | -$774K |
|
2775
Qfin Holdings
QFIN
$1.61B
| $1.28M | ﹤0.01% |
30,602
-23,422
| -43% | -$714K |
|
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.