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 | |
|---|---|---|---|---|---|---|
4851
CALL
Citi Trends
CTRN
$555M
| $126K | ﹤0.01% |
5,700
+2,200
| +63% | +$45K |
|
4852
PUT
ESAB
ESAB
$5.37B
| $126K | ﹤0.01% |
1,800
+1,700
| +1,700% | +$118K |
|
4853
CALL
Maximus
MMS
$3.32B
| $126K | ﹤0.01% |
1,700
+1,000
| +143% | +$81.4K |
|
4854
PUT
Adecoagro
AGRO
$1.4B
| $125K | ﹤0.01% |
10,700
+10,300
| +2,575% | +$111K |
|
4855
PUT
Allegion
ALLE
$13.5B
| $125K | ﹤0.01% |
1,200
+200
| +20% | +$22.5K |
|
4856
CALL
Avnet
AVT
$6.86B
| $125K | ﹤0.01% |
2,600
+600
| +30% | +$29K |
|
4857
PUT
Bentley Systems
BSY
$11.2B
| $125K | ﹤0.01% |
2,500
-20,700
| -89% | -$1.04M |
|
4858
CALL
Betterware México
BWMX
$632M
| $125K | ﹤0.01% |
+7,700
| New | +$116K |
|
4859
Capricor Therapeutics
CAPR
| $125K | ﹤0.01% |
36,781
+26,635
| +263% | +$150K |
|
4860
CALL
Capital Southwest
CSWC
$1.47B
| $125K | ﹤0.01% |
5,500
-25,200
| -82% | -$546K |
|
4861
Monte Rosa Therapeutics
GLUE
$1.82B
| $125K | ﹤0.01% |
+26,245
| New | +$169K |
|
4862
CALL
Haemonetics
HAE
$3.88B
| $125K | ﹤0.01% |
1,400
+1,100
| +367% | +$98.2K |
|
|
MTLS
4863
CALL
Materialise
MTLS
$366M
| $125K | ﹤0.01% |
22,900
+19,200
| +519% | +$138K |
|
4864
Origin Bancorp
OBK
$1.7B
| $125K | ﹤0.01% |
+4,360
| New | +$133K |
|
4865
Omega Healthcare
OHI
$15.3B
| $125K | ﹤0.01% |
+3,784
| New | +$121K |
|
4866
Invesco S&P 500 Equal Weight ETF
RSP
$97.3B
| $125K | ﹤0.01% |
888
+788
| +788% | +$118K |
|
|
TGNA
4867
CALL
DELISTED
TEGNA Inc
TGNA
| $125K | ﹤0.01% |
8,600
+1,600
| +23% | +$25.9K |
|
4868
CALL
Vir Biotechnology
VIR
$1.46B
| $125K | ﹤0.01% |
13,400
+3,900
| +41% | +$55.6K |
|
4869
CALL
Vuzix
VUZI
$178M
| $125K | ﹤0.01% |
34,500
+2,500
| +8% | +$11.1K |
|
|
HA
4870
CALL
DELISTED
Hawaiian Holdings, Inc.
HA
| $125K | ﹤0.01% |
19,900
-2,900
| -13% | -$27.5K |
|
4871
CALL
Franklin Electric
FELE
$4.66B
| $124K | ﹤0.01% |
+1,400
| New | +$135K |
|
|
FRGE
4872
CALL
DELISTED
Forge Global Holdings
FRGE
| $124K | ﹤0.01% |
4,073
+1,753
| +76% | +$64.2K |
|
4873
Immunome
IMNM
$2.62B
| $124K | ﹤0.01% |
14,939
-1,865
| -11% | -$13.7K |
|
|
NEWP
4874
New Pacific Metals
NEWP
$809M
| $124K | ﹤0.01% |
70,185
+18,442
| +36% | +$43.2K |
|
4875
PUT
Spire Global
SPIR
$408M
| $124K | ﹤0.01% |
+25,400
| New | +$132K |
|
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.