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 | |
|---|---|---|---|---|---|---|
951
CALL
Antero Resources
AR
$10.9B
| $9.4M | 0.01% |
370,600
-973,200
| -72% | -$25.1M |
|
952
PUT
Axos Financial
AX
$5.42B
| $9.39M | 0.01% |
248,100
+234,200
| +1,685% | +$9.91M |
|
953
PUT
Dominion Energy
D
$62.8B
| $9.38M | 0.01% |
210,000
+900
| +0.4% | +$44.7K |
|
954
KraneShares CSI China Internet ETF
KWEB
$5.2B
| $9.38M | 0.01% |
342,739
-194,801
| -36% | -$5.54M |
|
955
PUT
Toyota
TM
$209B
| $9.35M | 0.01% |
52,000
+20,700
| +66% | +$3.53M |
|
956
PUT
VinFast Auto
VFS
$7.18B
| $9.33M | 0.01% |
+746,500
| New | +$19.5M |
|
957
CALL
State Street
STT
$50.6B
| $9.32M | 0.01% |
139,200
+57,400
| +70% | +$4.05M |
|
958
CALL
SL Green Realty
SLG
$3.81B
| $9.29M | 0.01% |
249,000
+107,900
| +76% | +$3.88M |
|
959
CALL
Hilton Worldwide
HLT
$72.9B
| $9.28M | 0.01% |
61,800
-2,100
| -3% | -$317K |
|
960
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $9.28M | 0.01% |
149,200
-6,700
| -4% | -$431K |
|
961
CALL
Thor Industries
THO
$3.9B
| $9.28M | 0.01% |
97,500
+67,100
| +221% | +$7.01M |
|
962
PUT
Chubb
CB
$137B
| $9.26M | 0.01% |
44,500
-1,900
| -4% | -$384K |
|
963
PUT
Constellation Energy
CEG
$98.4B
| $9.25M | 0.01% |
84,800
-29,500
| -26% | -$3.04M |
|
964
PUT
J.M. Smucker
SJM
$12.4B
| $9.23M | 0.01% |
75,100
+67,900
| +943% | +$9.65M |
|
965
CALL
Sprott Junior Uranium Miners ETF
URNJ
$322M
| $9.21M | 0.01% |
196,300
+178,000
| +973% | +$3.36M |
|
966
CALL
Norfolk Southern
NSC
$78.3B
| $9.2M | 0.01% |
46,700
-5,200
| -10% | -$1.12M |
|
|
967
CALL
VinFast Auto
VFS
$7.18B
| $9.15M | 0.01% |
+732,200
| New | +$19.2M |
|
968
CALL
Capri Holdings
CPRI
$1.78B
| $9.13M | 0.01% |
173,500
-50,600
| -23% | -$2.29M |
|
|
969
CALL
Chubb
CB
$137B
| $9.1M | 0.01% |
43,700
+13,300
| +44% | +$2.69M |
|
970
CALL
CRH
CRH
$65.5B
| $9.08M | 0.01% |
165,900
+165,300
| +27,550% | +$9.39M |
|
971
PUT
ArcelorMittal
MT
$49.9B
| $9.08M | 0.01% |
362,700
+85,500
| +31% | +$2.27M |
|
972
PUT
Sempra
SRE
$61.1B
| $9.02M | 0.01% |
132,600
+107,600
| +430% | +$7.76M |
|
973
PUT
Matador Resources
MTDR
$6.42B
| $9.01M | 0.01% |
151,500
+111,400
| +278% | +$6.49M |
|
|
FL
974
PUT
DELISTED
Foot Locker
FL
| $9M | 0.01% |
518,800
+137,600
| +36% | +$3.08M |
|
975
CALL
Kimberly-Clark
KMB
$35.6B
| $8.98M | 0.01% |
74,300
-28,500
| -28% | -$3.68M |
|
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.