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 | |
|---|---|---|---|---|---|---|
2026
PUT
Kodiak Sciences
KOD
$2.59B
| $2.2M | ﹤0.01% |
23,000
| – | – |
|
2027
Church & Dwight Co
CHD
$23.1B
| $2.2M | ﹤0.01% |
25,887
+400
| +2% | +$33.9K |
|
2028
PUT
International Flavors & Fragrances
IFF
$19.4B
| $2.2M | ﹤0.01% |
14,700
+100
| +0.7% | +$14.7K |
|
2029
CALL
Thor Industries
THO
$3.99B
| $2.2M | ﹤0.01% |
18,900
-2,400
| -11% | -$274K |
|
2030
PUT
Tandem Diabetes Care
TNDM
$1.17B
| $2.19M | ﹤0.01% |
22,500
| – | – |
|
2031
PUT
AllianceBernstein
AB
$3.47B
| $2.18M | ﹤0.01% |
46,700
-200
| -0.4% | -$9.86K |
|
2032
CALL
Markel Group
MKL
$25B
| $2.18M | ﹤0.01% |
1,800
| – | – |
|
2033
Agnico Eagle Mines
AEM
$72.6B
| $2.18M | ﹤0.01% |
36,099
+2
| +0% | +$116 |
|
2034
CALL
FIGS
FIGS
$1.59B
| $2.18M | ﹤0.01% |
47,600
-9,800
| -17% | -$395K |
|
|
MOMO
2035
PUT
Hello Group
MOMO
$869M
| $2.18M | ﹤0.01% |
142,500
-5,600
| -4% | -$70.2K |
|
|
NTR
2036
PUT
DELISTED
NEW YORK MORTGAGE TRUST INC
NTR
| $2.18M | ﹤0.01% |
483,100
| – | – |
|
2037
PUT
Bumble
BMBL
$367M
| $2.18M | ﹤0.01% |
38,200
-2,500
| -6% | -$130K |
|
2038
CALL
Rayonier
RYN
$6.49B
| $2.18M | ﹤0.01% |
66,905
| – | – |
|
|
AL
2039
CALL
DELISTED
Air Lease Corp
AL
| $2.18M | ﹤0.01% |
51,300
| – | – |
|
|
BNY
2040
Bank of New York Mellon
BNY
$108B
| $2.17M | ﹤0.01% |
42,272
+1,460
| +4% | +$75.9K |
|
2041
PUT
Protolabs
PRLB
$1.86B
| $2.17M | ﹤0.01% |
23,500
| – | – |
|
2042
CALL
Senseonics Holdings Inc
SENS
$254M
| $2.17M | ﹤0.01% |
31,025
+70
| +0.2% | +$4.75K |
|
2043
PUT
Playtika
PLTK
$1.4B
| $2.17M | ﹤0.01% |
93,900
-2,100
| -2% | -$52.3K |
|
2044
General Motors
GM
$74.7B
| $2.16M | ﹤0.01% |
36,596
-10,991
| -23% | -$584K |
|
2045
Tower Semiconductor
TSEM
$26.4B
| $2.16M | ﹤0.01% |
73,649
+100
| +0.1% | +$2.88K |
|
2046
CALL
Cheesecake Factory
CAKE
$4.21B
| $2.16M | ﹤0.01% |
40,300
+300
| +0.8% | +$14.1K |
|
2047
PUT
Welltower
WELL
$178B
| $2.16M | ﹤0.01% |
25,800
-1,700
| -6% | -$146K |
|
|
CTRA
2048
DELISTED
Coterra Energy
CTRA
| $2.16M | ﹤0.01% |
120,905
+23,388
| +24% | +$401K |
|
2049
CALL
Vodafone
VOD
$34.9B
| $2.16M | ﹤0.01% |
126,700
| – | – |
|
|
FITB
2050
Fifth Third Bancorp
FITB
$52B
| $2.15M | ﹤0.01% |
55,601
+100
| +0.2% | +$3.83K |
|
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.