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 | |
|---|---|---|---|---|---|---|
1901
Ally Financial
ALLY
$13.1B
| $2.46M | ﹤0.01% |
48,755
+112
| +0.2% | +$5.79K |
|
|
XONE
1902
CALL
DELISTED
The ExOne Company
XONE
| $2.46M | ﹤0.01% |
116,700
+600
| +0.5% | +$12.6K |
|
1903
DexCom
DXCM
$27.6B
| $2.45M | ﹤0.01% |
22,932
-3,000
| -12% | -$378K |
|
|
TTM
1904
DELISTED
Tata Motors Limited
TTM
| $2.45M | ﹤0.01% |
106,522
-200
| -0.2% | -$4.06K |
|
|
TELL
1905
PUT
DELISTED
Tellurian Inc.
TELL
| $2.44M | ﹤0.01% |
524,600
+6,600
| +1% | +$22.6K |
|
1906
Citizens Financial Group
CFG
$30.4B
| $2.44M | ﹤0.01% |
52,554
-100
| -0.2% | -$4.39K |
|
1907
CALL
HDFC Bank
HDB
$119B
| $2.44M | ﹤0.01% |
67,400
| – | – |
|
1908
PUT
Cinemark Holdings
CNK
$3.82B
| $2.44M | ﹤0.01% |
110,500
| – | – |
|
1909
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$18.7B
| $2.43M | ﹤0.01% |
57,166
-1,371
| -2% | -$60K |
|
|
SIX
1910
CALL
DELISTED
Six Flags Entertainment Corp.
SIX
| $2.43M | ﹤0.01% |
55,500
+1,900
| +4% | +$78.9K |
|
1911
PUT
Inseego
INSG
$108M
| $2.43M | ﹤0.01% |
25,090
+1,300
| +5% | +$109K |
|
1912
PUT
Bank of Montreal
BMO
$125B
| $2.43M | ﹤0.01% |
23,500
| – | – |
|
1913
CALL
Fortive
FTV
$19B
| $2.43M | ﹤0.01% |
45,649
| – | – |
|
|
CAN
1914
CALL
Canaan Creative
CAN
$176M
| $2.43M | ﹤0.01% |
318,600
+27,100
| +9% | +$211K |
|
1915
NetEase
NTES
$76.5B
| $2.43M | ﹤0.01% |
21,339
-482
| -2% | -$45.5K |
|
1916
PUT
U-Haul Holding Co
UHAL
$14B
| $2.43M | ﹤0.01% |
41,000
| – | – |
|
|
PR
1917
PUT
Permian Resources
PR
$17.9B
| $2.42M | ﹤0.01% |
335,800
| – | – |
|
1918
Cedar Fair
FUN
$1.78B
| $2.42M | ﹤0.01% |
53,329
| – | – |
|
1919
Corsair Gaming
CRSR
$1.05B
| $2.41M | ﹤0.01% |
73,586
+1,149
| +2% | +$32.9K |
|
1920
CALL
Aptiv
APTV
$12B
| $2.41M | ﹤0.01% |
15,200
+200
| +1% | +$31.1K |
|
1921
CALL
Vanguard Dividend Appreciation ETF
VIG
$111B
| $2.41M | ﹤0.01% |
15,500
| – | – |
|
1922
PUT
Masco
MAS
$16B
| $2.41M | ﹤0.01% |
41,000
| – | – |
|
|
MILE
1923
CALL
DELISTED
Metromile, Inc. Common Stock
MILE
| $2.41M | ﹤0.01% |
261,600
-3,400
| -1% | -$19.2K |
|
1924
PUT
Pacific Biosciences
PACB
$422M
| $2.4M | ﹤0.01% |
70,000
| – | – |
|
1925
PUT
Penumbra
PEN
$12.5B
| $2.4M | ﹤0.01% |
8,700
+100
| +1% | +$26.9K |
|
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.