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 | |
|---|---|---|---|---|---|---|
126
CALL
Procter & Gamble
PG
$347B
| $106M | 0.08% |
723,300
-179,400
| -20% | -$27.4M |
|
127
PUT
Lam Research
LRCX
$399B
| $105M | 0.08% |
1,677,000
+258,000
| +18% | +$16.9M |
|
|
128
CALL
Qualcomm
QCOM
$185B
| $104M | 0.08% |
939,000
+121,200
| +15% | +$14.1M |
|
129
PUT
Mastercard
MA
$470B
| $104M | 0.08% |
262,200
-20,000
| -7% | -$8.03M |
|
130
CALL
Morgan Stanley
MS
$344B
| $103M | 0.08% |
1,262,600
-26,900
| -2% | -$2.34M |
|
131
CALL
Caterpillar
CAT
$412B
| $103M | 0.08% |
377,300
-46,800
| -11% | -$12.7M |
|
132
PUT
FedEx
FDX
$76.8B
| $103M | 0.08% |
388,200
-116,400
| -23% | -$30.3M |
|
133
CALL
First Solar
FSLR
$22.5B
| $102M | 0.08% |
629,000
+212,200
| +51% | +$39.6M |
|
134
PUT
ServiceNow
NOW
$98.8B
| $101M | 0.08% |
906,500
+198,500
| +28% | +$22.6M |
|
|
SCHW
135
PUT
Charles Schwab
SCHW
$175B
| $101M | 0.08% |
1,839,400
-193,000
| -9% | -$11.7M |
|
136
CALL
Target
TGT
$62.6B
| $101M | 0.08% |
909,800
-286,300
| -24% | -$36.3M |
|
137
CALL
Chipotle Mexican Grill
CMG
$41.4B
| $99.8M | 0.08% |
2,725,000
-255,000
| -9% | -$9.94M |
|
138
CALL
United Parcel Service
UPS
$98.6B
| $99.4M | 0.08% |
637,400
+114,200
| +22% | +$19.7M |
|
139
PUT
iShares MSCI Australia ETF
EWA
$1.35B
| $99M | 0.08% |
3,109,300
+158,000
| +5% | +$3.52M |
|
|
140
PUT
Morgan Stanley
MS
$344B
| $97.4M | 0.08% |
1,192,400
+117,500
| +11% | +$10.2M |
|
141
CALL
Pfizer
PFE
$142B
| $96.3M | 0.08% |
2,902,700
+599,100
| +26% | +$21.2M |
|
142
CALL
JD.com
JD
$40.7B
| $95.9M | 0.08% |
3,292,200
+1,752,000
| +114% | +$61M |
|
|
XYZ
143
CALL
Block Inc
XYZ
$45.9B
| $95M | 0.07% |
2,146,400
+522,800
| +32% | +$32.4M |
|
144
PUT
Carvana
CVNA
$45.2B
| $94.5M | 0.07% |
11,257,500
+7,520,000
| +201% | +$64.7M |
|
|
145
PUT
Pfizer
PFE
$142B
| $94.3M | 0.07% |
2,841,500
+448,000
| +19% | +$15.8M |
|
146
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$423M
| $93.7M | 0.07% |
259,740
-20,180
| -7% | -$12.3M |
|
147
PUT
lululemon athletica
LULU
$12.9B
| $93.5M | 0.07% |
242,400
-2,600
| -1% | -$993K |
|
148
CALL
Moderna
MRNA
$22.9B
| $93.1M | 0.07% |
901,100
+506,500
| +128% | +$56.5M |
|
149
CALL
Marvell Technology
MRVL
$190B
| $92.2M | 0.07% |
1,703,100
+186,100
| +12% | +$11M |
|
|
150
CALL
iShares MSCI Australia ETF
EWA
$1.35B
| $91.8M | 0.07% |
2,929,200
+333,900
| +13% | +$7.43M |
|
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.