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 | |
|---|---|---|---|---|---|---|
551
CALL
On Holding
ONON
$12.2B
| $22M | 0.02% |
791,300
-53,200
| -6% | -$1.68M |
|
|
P
552
CALL
Everpure Inc
P
$24.8B
| $22M | 0.02% |
617,400
-72,500
| -11% | -$2.69M |
|
553
CALL
Celsius Holdings
CELH
$7.28B
| $21.9M | 0.02% |
382,800
+120,900
| +46% | +$6.8M |
|
554
CALL
Simon Property Group
SPG
$73.4B
| $21.8M | 0.02% |
201,600
-64,400
| -24% | -$7.54M |
|
|
555
PUT
On Holding
ONON
$12.2B
| $21.8M | 0.02% |
782,000
+349,500
| +81% | +$11.1M |
|
556
CALL
Crown Castle
CCI
$33.8B
| $21.7M | 0.02% |
236,000
+173,900
| +280% | +$18M |
|
557
CALL
Cleveland-Cliffs
CLF
$5.39B
| $21.7M | 0.02% |
1,388,900
-314,300
| -18% | -$4.91M |
|
558
PUT
Chewy
CHWY
$8.81B
| $21.7M | 0.02% |
1,186,200
+569,500
| +92% | +$16.3M |
|
559
CALL
Oneok
OKE
$57.8B
| $21.5M | 0.02% |
339,400
+78,000
| +30% | +$5.09M |
|
560
CALL
Stryker
SYK
$119B
| $21.5M | 0.02% |
78,700
+12,000
| +18% | +$3.44M |
|
|
EXE
561
CALL
Expand Energy Corp
EXE
$22.3B
| $21.5M | 0.02% |
249,400
+76,300
| +44% | +$6.48M |
|
562
CALL
United States Oil Fund
USO
$2.36B
| $21.5M | 0.02% |
265,400
-90,400
| -25% | -$6.66M |
|
563
ASML
ASML
$692B
| $21.4M | 0.02% |
+36,377
| New | +$24.2M |
|
564
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $21.4M | 0.02% |
61,500
+6,900
| +13% | +$2.41M |
|
565
PUT
Capri Holdings
CPRI
$1.86B
| $21.2M | 0.02% |
403,900
-41,800
| -9% | -$1.9M |
|
566
PUT
Marathon Digital Holdings
MARA
$4.73B
| $21.2M | 0.02% |
2,489,500
+610,500
| +32% | +$8.19M |
|
567
CALL
Transocean
RIG
$5.87B
| $21.1M | 0.02% |
2,574,900
-620,400
| -19% | -$5.07M |
|
|
PXD
568
CALL
DELISTED
Pioneer Natural Resource Co.
PXD
| $21.1M | 0.02% |
91,900
+33,800
| +58% | +$7.69M |
|
569
CALL
Expedia Group
EXPE
$31.3B
| $21.1M | 0.02% |
204,600
+84,900
| +71% | +$9.37M |
|
570
PUT
Honeywell
HON
$73.8B
| $21.1M | 0.02% |
121,060
+10,716
| +10% | +$1.96M |
|
571
CALL
Dick's Sporting Goods
DKS
$18.8B
| $21M | 0.02% |
193,500
+89,400
| +86% | +$11.3M |
|
572
CALL
Capital One
COF
$124B
| $21M | 0.02% |
216,200
-147,900
| -41% | -$15.8M |
|
573
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $21M | 0.02% |
634,600
-351,500
| -36% | -$6.63M |
|
574
PUT
Vale
VALE
$63.2B
| $21M | 0.02% |
1,565,000
+355,300
| +29% | +$4.84M |
|
575
CALL
Altria Group
MO
$121B
| $20.9M | 0.02% |
497,300
-365,700
| -42% | -$16.2M |
|
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.