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 | |
|---|---|---|---|---|---|---|
3176
CALL
Tyler Technologies
TYL
$13B
| $617K | ﹤0.01% |
1,600
-50,100
| -97% | -$19.7M |
|
3177
CALL
ITT
ITT
$17.7B
| $616K | ﹤0.01% |
6,300
+3,000
| +91% | +$294K |
|
3178
CALL
Live Oak Bancshares
LOB
$1.95B
| $616K | ﹤0.01% |
21,300
+2,100
| +11% | +$67.5K |
|
|
SWN
3179
PUT
DELISTED
Southwestern Energy Company
SWN
| $616K | ﹤0.01% |
95,600
+32,700
| +52% | +$208K |
|
|
SRC
3180
CALL
DELISTED
SPIRIT REALTY CAPITAL, INC.
SRC
| $616K | ﹤0.01% |
18,400
-2,700
| -13% | -$104K |
|
3181
CALL
CoStar Group
CSGP
$11.9B
| $615K | ﹤0.01% |
8,000
-16,500
| -67% | -$1.37M |
|
3182
CALL
Murphy USA
MUSA
$11.3B
| $615K | ﹤0.01% |
1,800
-1,000
| -36% | -$318K |
|
3183
CALL
OFG Bancorp
OFG
$2.21B
| $615K | ﹤0.01% |
+20,600
| New | +$629K |
|
3184
Teucrium Wheat Fund
WEAT
$293M
| $615K | ﹤0.01% |
22,088
-4,973
| -18% | -$157K |
|
|
CNH
3185
CNH Industrial
CNH
$13.7B
| $615K | ﹤0.01% |
50,886
-12,302
| -19% | -$170K |
|
3186
CALL
Photronics
PLAB
$1.76B
| $614K | ﹤0.01% |
30,400
+24,000
| +375% | +$561K |
|
3187
CALL
Rocket Lab Corp
RKLB
$41.8B
| $614K | ﹤0.01% |
140,300
+30,600
| +28% | +$186K |
|
3188
PUT
B&G Foods
BGS
$291M
| $610K | ﹤0.01% |
61,700
+29,000
| +89% | +$360K |
|
3189
PUT
Varonis Systems
VRNS
$5.36B
| $610K | ﹤0.01% |
20,000
+100
| +0.5% | +$2.95K |
|
3190
PUT
Western Union
WU
$2.55B
| $610K | ﹤0.01% |
46,300
+17,100
| +59% | +$210K |
|
|
HTLF
3191
CALL
DELISTED
Heartland Financial USA, Inc.
HTLF
| $609K | ﹤0.01% |
+20,700
| New | +$644K |
|
|
SBOW
3192
DELISTED
SilverBow Resources, Inc.
SBOW
| $609K | ﹤0.01% |
17,026
-122
| -0.7% | -$4.45K |
|
3193
CALL
Grupo Aeroportuario Centro Norte
OMAB
$5.06B
| $608K | ﹤0.01% |
7,000
| – | – |
|
3194
CALL
Revvity
RVTY
$12.1B
| $608K | ﹤0.01% |
5,500
-4,300
| -44% | -$505K |
|
3195
PUT
Accel Entertainment
ACEL
$1.01B
| $607K | ﹤0.01% |
55,500
-264,000
| -83% | -$2.94M |
|
|
GMS
3196
PUT
DELISTED
GMS Inc
GMS
| $607K | ﹤0.01% |
9,500
+8,700
| +1,088% | +$604K |
|
3197
CALL
Aemetis
AMTX
$109M
| $606K | ﹤0.01% |
146,200
+29,800
| +26% | +$182K |
|
3198
Avis
CAR
$5.78B
| $606K | ﹤0.01% |
3,378
-11,564
| -77% | -$2.51M |
|
3199
CALL
Cohu
COHU
$2.26B
| $606K | ﹤0.01% |
17,600
+13,900
| +376% | +$523K |
|
3200
CALL
Navient
NAVI
$809M
| $606K | ﹤0.01% |
35,200
-900
| -2% | -$16.2K |
|
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.