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 | |
|---|---|---|---|---|---|---|
326
PUT
Newmont
NEM
$102B
| $42.4M | 0.03% |
1,148,200
+208,000
| +22% | +$8.46M |
|
327
CALL
Valero Energy
VLO
$92.3B
| $42.4M | 0.03% |
299,000
-47,300
| -14% | -$6.2M |
|
328
PUT
Baidu
BIDU
$36.6B
| $42.3M | 0.03% |
314,800
-2,700
| -0.9% | -$379K |
|
329
CALL
United Airlines
UAL
$38.1B
| $42.3M | 0.03% |
999,700
-4,900
| -0.5% | -$248K |
|
330
CALL
Marriott International
MAR
$97.5B
| $42.3M | 0.03% |
215,000
+59,400
| +38% | +$11.8M |
|
331
CALL
American Airlines Group
AAL
$9.78B
| $41.6M | 0.03% |
3,246,900
-1,226,100
| -27% | -$19M |
|
332
PUT
Cameco
CCJ
$39.4B
| $41.5M | 0.03% |
1,047,500
+550,300
| +111% | +$19.5M |
|
333
CALL
Vale
VALE
$63.2B
| $41.4M | 0.03% |
3,091,600
+2,071,000
| +203% | +$28.2M |
|
334
CALL
Diamondback Energy
FANG
$57.1B
| $41.3M | 0.03% |
266,600
+54,600
| +26% | +$8.06M |
|
335
State Street Utilities Select Sector SPDR ETF
XLU
$23.9B
| $41.3M | 0.03% |
1,401,350
+464,520
| +50% | +$15M |
|
336
PUT
Datadog
DDOG
$87.5B
| $41.1M | 0.03% |
451,400
-10,000
| -2% | -$989K |
|
337
PUT
Apollo Global Management
APO
$68.6B
| $40.9M | 0.03% |
455,300
-197,500
| -30% | -$16.6M |
|
338
CALL
Thermo Fisher Scientific
TMO
$196B
| $40.8M | 0.03% |
80,600
+100
| +0.1% | +$53.3K |
|
339
PUT
Zoom
ZM
$25.2B
| $40.7M | 0.03% |
582,600
-12,100
| -2% | -$840K |
|
340
CALL
Strategy Inc
MSTR
$36.3B
| $40.6M | 0.03% |
1,237,000
-49,000
| -4% | -$1.85M |
|
341
Bank of America
BAC
$432B
| $40.5M | 0.03% |
1,478,913
+600,140
| +68% | +$17.8M |
|
342
PUT
Roku
ROKU
$21.2B
| $40.3M | 0.03% |
570,400
-216,600
| -28% | -$16.8M |
|
343
CALL
3M
MMM
$89.1B
| $40.1M | 0.03% |
512,606
-240,874
| -32% | -$20.7M |
|
344
PUT
Sarepta Therapeutics
SRPT
$1.67B
| $40.1M | 0.03% |
330,600
+20,300
| +7% | +$2.29M |
|
345
PUT
Unity
U
$12.8B
| $40M | 0.03% |
1,272,800
+115,800
| +10% | +$4.46M |
|
346
CALL
Eaton
ETN
$158B
| $39.7M | 0.03% |
186,200
+44,300
| +31% | +$9.55M |
|
347
PUT
NXP Semiconductors
NXPI
$70.4B
| $39.7M | 0.03% |
198,600
+170,900
| +617% | +$35.4M |
|
348
CALL
AstraZeneca
AZN
$263B
| $39.6M | 0.03% |
292,050
+168,800
| +137% | +$23.1M |
|
349
PUT
Colgate-Palmolive
CL
$73.3B
| $39.4M | 0.03% |
554,400
+316,200
| +133% | +$23.6M |
|
350
CALL
Workday
WDAY
$32.7B
| $39M | 0.03% |
197,300
+49,900
| +34% | +$11.6M |
|
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.