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 | |
|---|---|---|---|---|---|---|
1576
Intercontinental Exchange
ICE
$82.4B
| $3.6M | ﹤0.01% |
+32,734
| New | +$3.75M |
|
1577
PUT
Alexandria Real Estate Equities
ARE
$8.88B
| $3.59M | ﹤0.01% |
35,900
+2,600
| +8% | +$302K |
|
1578
CALL
Entegris
ENTG
$19.7B
| $3.59M | ﹤0.01% |
38,200
-9,300
| -20% | -$931K |
|
1579
PUT
Cracker Barrel
CBRL
$1.2B
| $3.58M | ﹤0.01% |
53,300
+34,400
| +182% | +$2.89M |
|
1580
CALL
Carlisle Companies
CSL
$13.6B
| $3.58M | ﹤0.01% |
13,800
+4,900
| +55% | +$1.31M |
|
1581
Best Buy
BBY
$18B
| $3.57M | ﹤0.01% |
51,405
+27,180
| +112% | +$2.1M |
|
1582
PUT
Agilent Technologies
A
$39.1B
| $3.57M | ﹤0.01% |
31,900
-26,500
| -45% | -$3.18M |
|
1583
CALL
Telephone and Data Systems
TDS
$3.91B
| $3.55M | ﹤0.01% |
194,100
+192,900
| +16,075% | +$2.78M |
|
1584
CALL
Array Technologies
ARRY
$818M
| $3.55M | ﹤0.01% |
159,900
+23,600
| +17% | +$513K |
|
1585
PUT
Trip.com Group
TCOM
$27.5B
| $3.54M | ﹤0.01% |
101,400
-2,800
| -3% | -$105K |
|
|
CTRA
1586
CALL
DELISTED
Coterra Energy
CTRA
| $3.54M | ﹤0.01% |
131,000
-285,800
| -69% | -$7.79M |
|
1587
CALL
Dycom Industries
DY
$12.9B
| $3.54M | ﹤0.01% |
39,800
+24,500
| +160% | +$2.44M |
|
1588
PUT
ChargePoint
CHPT
$133M
| $3.54M | ﹤0.01% |
35,570
+18,820
| +112% | +$2.73M |
|
1589
PUT
OneMain Financial
OMF
$6.9B
| $3.54M | ﹤0.01% |
88,200
+56,200
| +176% | +$2.4M |
|
1590
AdvisorShares Pure US Cannabis ETF
MSOS
$864M
| $3.53M | ﹤0.01% |
445,055
+329,232
| +284% | +$2.08M |
|
|
NEWR
1591
PUT
DELISTED
New Relic, Inc.
NEWR
| $3.53M | ﹤0.01% |
41,200
+33,000
| +402% | +$2.66M |
|
1592
PUT
Camtek
CAMT
$6.9B
| $3.5M | ﹤0.01% |
56,300
-20,900
| -27% | -$1.03M |
|
1593
PUT
Northern Trust
NTRS
$22.2B
| $3.5M | ﹤0.01% |
50,400
+33,000
| +190% | +$2.49M |
|
1594
PUT
Crinetics Pharmaceuticals
CRNX
$8.86B
| $3.5M | ﹤0.01% |
117,700
+114,000
| +3,081% | +$2.35M |
|
1595
CALL
Aptiv
APTV
$12B
| $3.5M | ﹤0.01% |
35,500
-19,900
| -36% | -$2.06M |
|
1596
CALL
MP Materials
MP
$7.35B
| $3.5M | ﹤0.01% |
183,000
-12,400
| -6% | -$275K |
|
1597
CALL
Joby Aviation
JOBY
$6.82B
| $3.49M | ﹤0.01% |
540,700
+49,600
| +10% | +$391K |
|
1598
CALL
Floor & Decor
FND
$5.81B
| $3.48M | ﹤0.01% |
38,500
-24,000
| -38% | -$2.44M |
|
1599
CALL
Canadian Pacific Kansas City
CP
$82B
| $3.48M | ﹤0.01% |
46,800
-13,300
| -22% | -$1.05M |
|
1600
Pan American Silver
PAAS
$18.6B
| $3.48M | ﹤0.01% |
240,063
+65,140
| +37% | +$1.02M |
|
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.