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 | |
|---|---|---|---|---|---|---|
176
CALL
RTX Corp
RTX
$262B
| $80.5M | 0.06% |
1,117,900
+726,300
| +185% | +$62.2M |
|
177
PUT
General Motors
GM
$74.1B
| $80.3M | 0.06% |
2,436,200
+241,400
| +11% | +$8.58M |
|
178
CALL
Applied Materials
AMAT
$440B
| $79.9M | 0.06% |
576,900
+66,000
| +13% | +$9.46M |
|
179
PUT
T-Mobile US
TMUS
$207B
| $79.2M | 0.06% |
565,300
+156,800
| +38% | +$21.7M |
|
|
180
CALL
T-Mobile US
TMUS
$207B
| $79M | 0.06% |
564,400
+155,100
| +38% | +$21.5M |
|
181
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $79M | 0.06% |
247,830
+28,900
| +13% | +$17.6M |
|
182
CALL
Texas Instruments
TXN
$268B
| $79M | 0.06% |
496,600
+10,800
| +2% | +$1.84M |
|
183
CALL
Royal Caribbean
RCL
$76.7B
| $78.8M | 0.06% |
855,600
+87,000
| +11% | +$8.71M |
|
184
PUT
Walmart Inc
WMT
$870B
| $78.3M | 0.06% |
2,217,000
-1,226,400
| -36% | -$65.3M |
|
185
PUT
Union Pacific
UNP
$174B
| $78.2M | 0.06% |
384,200
+24,100
| +7% | +$5.25M |
|
186
PUT
Chipotle Mexican Grill
CMG
$41.3B
| $77.5M | 0.06% |
2,115,000
-160,000
| -7% | -$6.24M |
|
187
CALL
American Tower
AMT
$77.4B
| $77.4M | 0.06% |
470,800
+359,500
| +323% | +$65.7M |
|
188
PUT
Humana
HUM
$47.7B
| $77.4M | 0.06% |
159,000
+39,400
| +33% | +$18.5M |
|
189
CALL
ARK Space & Defense Innovation ETF
ARKX
$817M
| $77M | 0.06% |
2,008,500
+462,300
| +30% | +$6.76M |
|
190
PUT
Wells Fargo
WFC
$262B
| $76.9M | 0.06% |
1,882,300
-1,439,700
| -43% | -$62.2M |
|
191
CALL
AT&T
T
$160B
| $76.2M | 0.06% |
5,639,400
+3,706,100
| +192% | +$54.3M |
|
192
PUT
Moderna
MRNA
$23B
| $75.5M | 0.06% |
731,300
+179,400
| +33% | +$20M |
|
193
CALL
Blackstone
BX
$150B
| $75.3M | 0.06% |
702,900
+107,600
| +18% | +$11.2M |
|
194
CALL
Carnival Corporation Ltd
CCL
$35.7B
| $74.2M | 0.06% |
5,406,700
-804,900
| -13% | -$13.3M |
|
195
PUT
Target
TGT
$62.6B
| $72.9M | 0.06% |
659,100
-508,300
| -44% | -$64.5M |
|
196
CALL
Super Micro Computer
SMCI
$19.8B
| $72.7M | 0.06% |
2,650,000
-1,140,000
| -30% | -$31.8M |
|
197
CALL
CVS Health
CVS
$138B
| $72.6M | 0.06% |
1,039,800
-199,500
| -16% | -$14.1M |
|
198
CALL
McDonald's
MCD
$187B
| $72.4M | 0.06% |
274,700
+7,300
| +3% | +$2.08M |
|
199
CALL
Pinterest
PINS
$12.6B
| $71.8M | 0.06% |
2,656,800
+345,900
| +15% | +$9.44M |
|
200
PUT
Freeport-McMoran
FCX
$93.4B
| $71.6M | 0.06% |
1,919,800
-279,300
| -13% | -$11.3M |
|
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.