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 | |
|---|---|---|---|---|---|---|
|
SAFE
4401
PUT
Safehold
SAFE
$1.17B
| $192K | ﹤0.01% |
14,300
-25,200
| -64% | -$545K |
|
4402
Tradeweb Markets
TW
$23B
| $192K | ﹤0.01% |
+2,399
| New | +$191K |
|
4403
PUT
Voya Financial
VOYA
$8.96B
| $192K | ﹤0.01% |
2,900
-1,000
| -26% | -$71.2K |
|
|
AY
4404
CALL
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $192K | ﹤0.01% |
10,100
-383,500
| -97% | -$8.68M |
|
4405
PUT
DXC Technology
DXC
$1.91B
| $191K | ﹤0.01% |
9,200
+4,800
| +109% | +$110K |
|
4406
CALL
SFL Corp
SFL
$1.61B
| $191K | ﹤0.01% |
17,200
-16,600
| -49% | -$172K |
|
4407
CALL
WPP
WPP
$4.67B
| $191K | ﹤0.01% |
4,300
+4,000
| +1,333% | +$200K |
|
4408
CALL
Sphere 3D
ANY
$15.7M
| $190K | ﹤0.01% |
14,350
+320
| +2% | +$6.05K |
|
4409
Digimarc Corp
DMRC
$143M
| $190K | ﹤0.01% |
+5,858
| New | +$188K |
|
4410
CALL
GFL Environmental
GFL
$14.5B
| $190K | ﹤0.01% |
6,000
+5,500
| +1,100% | +$189K |
|
4411
HDFC Bank
HDB
$123B
| $190K | ﹤0.01% |
6,460
-516
| -7% | -$16.8K |
|
4412
CALL
ProPetro Holding
PUMP
$1.25B
| $190K | ﹤0.01% |
17,900
+1,100
| +7% | +$10.9K |
|
4413
Rayonier Advanced Materials
RYAM
$562M
| $190K | ﹤0.01% |
53,778
+26,807
| +99% | +$101K |
|
4414
Wolverine World Wide
WWW
$1.68B
| $190K | ﹤0.01% |
23,584
+10,399
| +79% | +$107K |
|
4415
Green Brick Partners
GRBK
$3.09B
| $189K | ﹤0.01% |
4,556
+3,584
| +369% | +$179K |
|
4416
PUT
RPC Inc
RES
$1.13B
| $189K | ﹤0.01% |
21,200
+12,900
| +155% | +$108K |
|
4417
PUT
Saic
SAIC
$4.95B
| $189K | ﹤0.01% |
1,800
+1,700
| +1,700% | +$196K |
|
4418
CALL
TORM
TRMD
$3.05B
| $189K | ﹤0.01% |
6,900
-6,000
| -47% | -$152K |
|
4419
PUT
Apple Hospitality REIT
APLE
$3.97B
| $188K | ﹤0.01% |
12,300
-600
| -5% | -$9.18K |
|
4420
B2Gold
BTG
$4.98B
| $188K | ﹤0.01% |
+65,390
| New | +$213K |
|
|
4421
PUT
B2Gold
BTG
$4.98B
| $188K | ﹤0.01% |
65,200
+63,300
| +3,332% | +$206K |
|
4422
Kratos Defense & Security Solutions
KTOS
$8.23B
| $188K | ﹤0.01% |
12,536
-169
| -1% | -$2.52K |
|
4423
CALL
Post Holdings
POST
$4.42B
| $188K | ﹤0.01% |
2,200
+1,800
| +450% | +$157K |
|
4424
CALL
Upbound Group
UPBD
$1.22B
| $188K | ﹤0.01% |
6,400
-4,500
| -41% | -$140K |
|
4425
PUT
Procept Biorobotics
PRCT
$1.02B
| $187K | ﹤0.01% |
+5,700
| New | +$194K |
|
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.