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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2026
PUT
Green Plains
GPRE
$1.19B
| $2.11M | ﹤0.01% |
70,000
-29,000
| -29% | -$950K |
|
2027
PUT
Service Corp International
SCI
$11.4B
| $2.1M | ﹤0.01% |
36,800
+26,200
| +247% | +$1.65M |
|
2028
CALL
Danaos Corp
DAC
$2.55B
| $2.1M | ﹤0.01% |
31,700
+1,700
| +6% | +$114K |
|
|
ETRN
2029
CALL
DELISTED
Equitrans Midstream Corporation Common Stock
ETRN
| $2.1M | ﹤0.01% |
224,000
-218,000
| -49% | -$2.08M |
|
2030
CALL
Transmedics
TMDX
$2.5B
| $2.1M | ﹤0.01% |
38,300
+25,500
| +199% | +$1.84M |
|
|
KRTX
2031
PUT
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $2.1M | ﹤0.01% |
12,400
-2,000
| -14% | -$376K |
|
2032
PUT
Broadridge
BR
$17.2B
| $2.09M | ﹤0.01% |
11,700
+11,500
| +5,750% | +$2.04M |
|
2033
AGNC Investment
AGNC
$12.3B
| $2.09M | ﹤0.01% |
221,702
+140,545
| +173% | +$1.39M |
|
2034
PUT
Chord Energy
CHRD
$7.79B
| $2.09M | ﹤0.01% |
12,900
+3,000
| +30% | +$471K |
|
2035
PUT
Aehr Test Systems
AEHR
$2.48B
| $2.09M | ﹤0.01% |
45,700
-2,300
| -5% | -$107K |
|
2036
Rocket Pharmaceuticals
RCKT
$348M
| $2.09M | ﹤0.01% |
+101,928
| New | +$1.85M |
|
2037
CALL
Teledyne Technologies
TDY
$30.4B
| $2.08M | ﹤0.01% |
5,100
+4,100
| +410% | +$1.66M |
|
2038
Alcoa
AA
$11.7B
| $2.08M | ﹤0.01% |
71,564
-114,151
| -61% | -$3.58M |
|
2039
Meritage Homes
MTH
$4.87B
| $2.07M | ﹤0.01% |
33,906
+30,110
| +793% | +$2.07M |
|
2040
PUT
Installed Building Products
IBP
$6.13B
| $2.07M | ﹤0.01% |
+16,600
| New | +$2.34M |
|
2041
Sibanye-Stillwater
SBSW
$5.92B
| $2.07M | ﹤0.01% |
336,004
+125,218
| +59% | +$825K |
|
2042
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $2.07M | ﹤0.01% |
16,100
+5,500
| +52% | +$795K |
|
2043
PUT
Vipshop
VIPS
$6.84B
| $2.07M | ﹤0.01% |
129,100
-104,800
| -45% | -$1.7M |
|
2044
CALL
Franklin Resources
BEN
$16.9B
| $2.06M | ﹤0.01% |
84,000
+55,500
| +195% | +$1.5M |
|
2045
CALL
Schrodinger
SDGR
$1.12B
| $2.06M | ﹤0.01% |
72,900
-5,500
| -7% | -$222K |
|
2046
CALL
PagSeguro Digital
PAGS
$2.57B
| $2.06M | ﹤0.01% |
239,100
+12,600
| +6% | +$119K |
|
2047
CALL
Logitech
LOGI
$15.2B
| $2.05M | ﹤0.01% |
29,800
-29,400
| -50% | -$1.98M |
|
2048
PUT
Tidewater
TDW
$3.91B
| $2.05M | ﹤0.01% |
28,900
+20,100
| +228% | +$1.27M |
|
2049
PUT
FuboTV Inc
FUBO
$245M
| $2.05M | ﹤0.01% |
63,975
+13,517
| +27% | +$419K |
|
|
2050
PUT
Sibanye-Stillwater
SBSW
$5.92B
| $2.05M | ﹤0.01% |
331,700
+74,300
| +29% | +$490K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.