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 | |
|---|---|---|---|---|---|---|
301
PUT
Marathon Petroleum
MPC
$92.2B
| $46M | 0.04% |
304,200
+79,400
| +35% | +$11.1M |
|
302
PUT
Diamondback Energy
FANG
$57.1B
| $45.8M | 0.04% |
295,700
+140,400
| +90% | +$20.7M |
|
303
CALL
Comcast
CMCSA
$84B
| $45.8M | 0.04% |
1,031,800
+447,400
| +77% | +$20M |
|
304
CALL
EOG Resources
EOG
$76.7B
| $45.7M | 0.04% |
360,300
+54,700
| +18% | +$6.96M |
|
305
PUT
Pinterest
PINS
$12.6B
| $45.4M | 0.04% |
1,680,500
-56,700
| -3% | -$1.55M |
|
306
PUT
Accenture
ACN
$85.7B
| $45.1M | 0.04% |
146,700
+4,700
| +3% | +$1.48M |
|
|
SPLK
307
CALL
DELISTED
Splunk Inc
SPLK
| $45M | 0.04% |
307,900
-106,500
| -26% | -$12.1M |
|
308
CALL
XPeng
XPEV
$12.3B
| $44.9M | 0.04% |
2,448,200
+51,000
| +2% | +$865K |
|
309
PUT
Carnival Corporation Ltd
CCL
$35.7B
| $44.8M | 0.04% |
3,267,300
-1,620,000
| -33% | -$26.8M |
|
310
PUT
SolarEdge
SEDG
$2.91B
| $44.6M | 0.04% |
344,100
+173,400
| +102% | +$33.3M |
|
311
CALL
Roblox
RBLX
$35.5B
| $44.6M | 0.04% |
1,538,800
+333,500
| +28% | +$11.1M |
|
312
PUT
Danaher
DHR
$127B
| $44.4M | 0.03% |
202,025
+94,414
| +88% | +$21.1M |
|
313
CALL
Delta Air Lines
DAL
$54.9B
| $44.2M | 0.03% |
1,193,900
+193,000
| +19% | +$8.38M |
|
314
CALL
Progressive
PGR
$119B
| $43.9M | 0.03% |
315,100
+170,100
| +117% | +$22.4M |
|
315
CALL
Twilio
TWLO
$27.8B
| $43.8M | 0.03% |
747,700
-69,600
| -9% | -$4.34M |
|
316
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $43.8M | 0.03% |
130,631
+104,312
| +396% | +$36.2M |
|
317
CALL
Honeywell
HON
$73.8B
| $43.7M | 0.03% |
250,714
+71,405
| +40% | +$13.1M |
|
318
PUT
iShares Silver Trust
SLV
$28.8B
| $43.6M | 0.03% |
2,142,000
-1,624,000
| -43% | -$35.1M |
|
319
PUT
Zscaler
ZS
$23B
| $43.6M | 0.03% |
280,000
-177,300
| -39% | -$26.6M |
|
320
PUT
Sea Limited
SE
$64.2B
| $43.4M | 0.03% |
987,100
+427,500
| +76% | +$20.9M |
|
321
CALL
MetLife
MET
$60B
| $43.3M | 0.03% |
688,900
+214,000
| +45% | +$13.3M |
|
322
CALL
DoorDash
DASH
$77.4B
| $42.7M | 0.03% |
537,900
+72,500
| +16% | +$5.9M |
|
|
323
CALL
Danaher
DHR
$127B
| $42.5M | 0.03% |
193,452
+126,562
| +189% | +$28.2M |
|
324
CALL
American Express
AXP
$238B
| $42.5M | 0.03% |
285,200
+63,500
| +29% | +$10.4M |
|
325
CALL
TJX Companies
TJX
$172B
| $42.5M | 0.03% |
477,800
+234,800
| +97% | +$20.7M |
|
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.