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 | |
|---|---|---|---|---|---|---|
2326
PUT
Northern Oil and Gas
NOG
$2.3B
| $1.49M | ﹤0.01% |
37,000
+8,400
| +29% | +$331K |
|
2327
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $1.49M | ﹤0.01% |
183,200
+127,500
| +229% | +$1.2M |
|
2328
PUT
Axcelis
ACLS
$4.12B
| $1.48M | ﹤0.01% |
9,100
-400
| -4% | -$70.4K |
|
2329
Labcorp
LH
$24.3B
| $1.48M | ﹤0.01% |
+7,364
| New | +$1.55M |
|
2330
Direxion Daily TSLA Bull 2X ETF
TSLL
$2.44B
| $1.48M | ﹤0.01% |
95,631
+52,579
| +122% | +$870K |
|
2331
PUT
Cytokinetics
CYTK
$11B
| $1.48M | ﹤0.01% |
50,100
+19,900
| +66% | +$663K |
|
2332
PUT
Evercore
EVR
$13.1B
| $1.48M | ﹤0.01% |
10,700
+5,500
| +106% | +$747K |
|
2333
PUT
YPF
YPF
$20.2B
| $1.47M | ﹤0.01% |
120,300
-27,600
| -19% | -$390K |
|
2334
CALL
Robert Half
RHI
$3.61B
| $1.47M | ﹤0.01% |
20,100
+11,100
| +123% | +$842K |
|
2335
PUT
Natera
NTRA
$37.5B
| $1.47M | ﹤0.01% |
33,200
-1,600
| -5% | -$81.6K |
|
2336
State Street Communication Services Select Sector SPDR ETF
XLC
$21.9B
| $1.47M | ﹤0.01% |
22,405
-53,689
| -71% | -$3.58M |
|
2337
Telephone and Data Systems
TDS
$3.91B
| $1.47M | ﹤0.01% |
80,156
+78,861
| +6,090% | +$1.14M |
|
2338
CALL
ZTO Express
ZTO
$18.2B
| $1.47M | ﹤0.01% |
60,700
-5,200
| -8% | -$132K |
|
2339
PUT
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $1.47M | ﹤0.01% |
21,900
-900
| -4% | -$49.1K |
|
|
BIG
2340
PUT
DELISTED
Big Lots, Inc.
BIG
| $1.46M | ﹤0.01% |
286,200
+273,800
| +2,208% | +$2.08M |
|
2341
PPG Industries
PPG
$25.9B
| $1.46M | ﹤0.01% |
+11,240
| New | +$1.58M |
|
|
CTRA
2342
PUT
DELISTED
Coterra Energy
CTRA
| $1.46M | ﹤0.01% |
53,800
-7,900
| -13% | -$215K |
|
2343
Vista Energy
VIST
$7.75B
| $1.46M | ﹤0.01% |
47,889
-15,073
| -24% | -$394K |
|
|
SWAV
2344
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $1.46M | ﹤0.01% |
7,312
-181
| -2% | -$42.8K |
|
2345
PUT
Doximity
DOCS
$3.67B
| $1.45M | ﹤0.01% |
68,500
-37,600
| -35% | -$1.03M |
|
2346
CALL
ATI
ATI
$27B
| $1.45M | ﹤0.01% |
35,300
-1,400
| -4% | -$62.2K |
|
2347
CALL
American Water Works
AWK
$26.3B
| $1.45M | ﹤0.01% |
11,700
+3,800
| +48% | +$533K |
|
2348
PUT
Silicon Laboratories
SLAB
$7.15B
| $1.45M | ﹤0.01% |
12,500
+1,600
| +15% | +$221K |
|
2349
Invesco Solar ETF
TAN
$1.47B
| $1.44M | ﹤0.01% |
27,866
+22,356
| +406% | +$1.38M |
|
2350
CALL
Lemonade
LMND
$4.62B
| $1.44M | ﹤0.01% |
124,100
+17,500
| +16% | +$281K |
|
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.