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 | |
|---|---|---|---|---|---|---|
|
CFLT
1126
CALL
DELISTED
Confluent
CFLT
| $6.98M | 0.01% |
235,700
+13,400
| +6% | +$449K |
|
1127
PUT
Dropbox
DBX
$6.63B
| $6.98M | 0.01% |
256,300
+53,700
| +27% | +$1.46M |
|
1128
CALL
Conagra Brands
CAG
$6.88B
| $6.97M | 0.01% |
254,200
+211,400
| +494% | +$6.52M |
|
|
WCC
1129
CALL
WESCO International
WCC
$16.1B
| $6.96M | 0.01% |
48,400
-42,900
| -47% | -$6.93M |
|
1130
CALL
Tenet Healthcare
THC
$17.1B
| $6.94M | 0.01% |
105,400
-39,300
| -27% | -$2.94M |
|
1131
PUT
Aon
AON
$76B
| $6.94M | 0.01% |
21,400
-8,200
| -28% | -$2.71M |
|
1132
CALL
Paychex
PAYX
$39.4B
| $6.93M | 0.01% |
60,100
-18,200
| -23% | -$2.19M |
|
1133
CALL
Toast
TOST
$16.5B
| $6.93M | 0.01% |
370,000
+78,700
| +27% | +$1.71M |
|
1134
CALL
Boston Properties
BXP
$10.8B
| $6.93M | 0.01% |
116,500
-66,000
| -36% | -$4.22M |
|
1135
CALL
Polaris
PII
$4.13B
| $6.92M | 0.01% |
66,500
+14,500
| +28% | +$1.72M |
|
1136
PUT
Keysight
KEYS
$55.6B
| $6.92M | 0.01% |
52,300
+29,500
| +129% | +$4.37M |
|
1137
CALL
TransDigm Group
TDG
$67.9B
| $6.91M | 0.01% |
8,200
-13,500
| -62% | -$11.8M |
|
1138
PUT
Global Payments
GPN
$21.3B
| $6.91M | 0.01% |
59,900
-10,400
| -15% | -$1.24M |
|
1139
PUT
KE Holdings
BEKE
$17B
| $6.9M | 0.01% |
444,400
+288,400
| +185% | +$4.58M |
|
1140
PUT
New Oriental
EDU
$7.85B
| $6.88M | 0.01% |
117,600
+22,000
| +23% | +$1.15M |
|
1141
PUT
Star Bulk Carriers
SBLK
$3.03B
| $6.88M | 0.01% |
357,000
+241,000
| +208% | +$4.29M |
|
|
1142
PUT
Paychex
PAYX
$39.4B
| $6.87M | 0.01% |
59,600
-1,500
| -2% | -$181K |
|
1143
CALL
Restaurant Brands International
QSR
$25.1B
| $6.87M | 0.01% |
103,100
+61,900
| +150% | +$4.45M |
|
1144
BioNTech
BNTX
$23.3B
| $6.87M | 0.01% |
63,193
+63,186
| +902,657% | +$6.99M |
|
1145
CALL
Invitation Homes
INVH
$17.5B
| $6.86M | 0.01% |
216,600
+56,500
| +35% | +$1.94M |
|
1146
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $6.85M | 0.01% |
15,000
+1,800
| +14% | +$863K |
|
1147
PUT
Unilever
UL
$130B
| $6.85M | 0.01% |
123,200
-13,067
| -10% | -$755K |
|
1148
CALL
Synchrony
SYF
$23.3B
| $6.84M | 0.01% |
223,800
+17,800
| +9% | +$592K |
|
|
FISV
1149
PUT
Fiserv Inc
FISV
$26.6B
| $6.82M | 0.01% |
60,400
-89,800
| -60% | -$11.1M |
|
|
CMA
1150
CALL
DELISTED
Comerica
CMA
| $6.81M | 0.01% |
163,900
-79,500
| -33% | -$3.77M |
|
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.