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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1601
PUT
Vanguard Dividend Appreciation ETF
VIG
$111B
| $3.22M | ﹤0.01% |
20,700
| – | – |
|
1602
PUT
Waste Management
WM
$95.9B
| $3.22M | ﹤0.01% |
22,800
| – | – |
|
|
JKS
1603
PUT
JinkoSolar
JKS
$775M
| $3.22M | ﹤0.01% |
61,800
+600
| +1% | +$30.4K |
|
1604
Warner Bros
WBD
$64.6B
| $3.22M | ﹤0.01% |
103,082
+4,695
| +5% | +$132K |
|
1605
PUT
H&R Block
HRB
$5.18B
| $3.21M | ﹤0.01% |
135,200
| – | – |
|
1606
CALL
Boyd Gaming
BYD
$6.47B
| $3.21M | ﹤0.01% |
51,600
+1,100
| +2% | +$65.2K |
|
1607
PUT
Gartner
IT
$9.41B
| $3.2M | ﹤0.01% |
12,900
| – | – |
|
1608
CALL
Chemours
CC
$2.59B
| $3.2M | ﹤0.01% |
90,300
+1,300
| +1% | +$42.1K |
|
1609
CALL
Fulgent Genetics
FLGT
$559M
| $3.2M | ﹤0.01% |
36,600
| – | – |
|
1610
Opendoor
OPEN
$3.69B
| $3.2M | ﹤0.01% |
193,477
+16,090
| +9% | +$260K |
|
1611
CALL
NMI Holdings
NMIH
$3.25B
| $3.2M | ﹤0.01% |
140,800
-100
| -0.1% | -$2.2K |
|
1612
CALL
Iovance Biotherapeutics
IOVA
$2.23B
| $3.19M | ﹤0.01% |
120,200
| – | – |
|
1613
PUT
Jack in the Box
JACK
$278M
| $3.19M | ﹤0.01% |
28,300
+400
| +1% | +$41.7K |
|
1614
BILL Holdings
BILL
$4.33B
| $3.19M | ﹤0.01% |
17,749
+2
| +0% | +$461 |
|
1615
PUT
ProShares Ultra S&P500
SSO
$7.82B
| $3.18M | ﹤0.01% |
177,200
+1,600
| +0.9% | +$50.6K |
|
1616
CALL
Jabil
JBL
$32.8B
| $3.17M | ﹤0.01% |
54,700
-100
| -0.2% | -$5.95K |
|
1617
PUT
Herbalife
HLF
$1.23B
| $3.17M | ﹤0.01% |
60,000
| – | – |
|
1618
CALL
MasTec
MTZ
$26.7B
| $3.17M | ﹤0.01% |
29,800
| – | – |
|
1619
Capri Holdings
CPRI
$1.77B
| $3.17M | ﹤0.01% |
55,951
+3,412
| +6% | +$186K |
|
1620
PUT
Brinker International
EAT
$8.02B
| $3.17M | ﹤0.01% |
51,600
+600
| +1% | +$32.6K |
|
|
IPOF
1621
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $3.16M | ﹤0.01% |
309,424
-20,654
| -6% | -$207K |
|
1622
PUT
Kinross Gold
KGC
$28.5B
| $3.16M | ﹤0.01% |
497,100
-3,400
| -0.7% | -$20.4K |
|
1623
Lemonade
LMND
$4.62B
| $3.16M | ﹤0.01% |
28,039
-571
| -2% | -$46K |
|
1624
O'Reilly Automotive
ORLY
$72.4B
| $3.16M | ﹤0.01% |
82,410
+13,500
| +20% | +$540K |
|
1625
PUT
The Greenbrier Companies
GBX
$1.61B
| $3.16M | ﹤0.01% |
72,700
| – | – |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.