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 | |
|---|---|---|---|---|---|---|
476
PUT
Upstart Holdings
UPST
$2.74B
| $25.9M | 0.02% |
907,400
+54,000
| +6% | +$2.17M |
|
477
CALL
Roper Technologies
ROP
$34B
| $25.8M | 0.02% |
53,200
+33,800
| +174% | +$16.6M |
|
478
CALL
Southwest Airlines
LUV
$23.3B
| $25.7M | 0.02% |
950,900
+560,100
| +143% | +$18.3M |
|
479
PUT
AutoZone
AZO
$48.5B
| $25.7M | 0.02% |
10,100
+1,800
| +22% | +$4.52M |
|
480
CALL
United Rentals
URI
$64.8B
| $25.7M | 0.02% |
57,700
-41,800
| -42% | -$19.1M |
|
481
PUT
Live Nation Entertainment
LYV
$41.4B
| $25.6M | 0.02% |
308,400
+193,500
| +168% | +$16.9M |
|
482
PUT
XPeng
XPEV
$12.3B
| $25.5M | 0.02% |
1,390,900
+231,400
| +20% | +$3.93M |
|
483
PUT
Petrobras
PBR
$122B
| $25.5M | 0.02% |
1,704,800
-584,200
| -26% | -$8.31M |
|
484
PUT
Darden Restaurants
DRI
$22.2B
| $25.4M | 0.02% |
177,300
-5,400
| -3% | -$856K |
|
|
SHNY
485
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $25.3M | 0.02% |
1,422,200
+70,100
| +5% | +$1.25M |
|
486
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$156M
| $25.2M | 0.02% |
270,100
+104,575
| +63% | +$9.82M |
|
487
CALL
Zoetis
ZTS
$31.1B
| $25.2M | 0.02% |
144,700
+30,300
| +26% | +$5.5M |
|
488
CALL
Builders FirstSource
BLDR
$7.64B
| $25.1M | 0.02% |
201,300
+37,000
| +23% | +$5.1M |
|
|
489
PUT
Southwest Airlines
LUV
$23.3B
| $24.8M | 0.02% |
917,300
+194,100
| +27% | +$6.33M |
|
490
PUT
Teck Resources
TECK
$28B
| $24.8M | 0.02% |
574,700
-160,500
| -22% | -$6.65M |
|
491
CALL
APA Corp
APA
$12.8B
| $24.7M | 0.02% |
602,100
-138,000
| -19% | -$5.68M |
|
|
DFS
492
PUT
DELISTED
Discover Financial Services
DFS
| $24.7M | 0.02% |
285,600
+193,300
| +209% | +$19.2M |
|
493
CALL
Shell
SHEL
$243B
| $24.6M | 0.02% |
382,300
-124,900
| -25% | -$7.77M |
|
494
PUT
Texas Instruments
TXN
$268B
| $24.6M | 0.02% |
154,500
-203,200
| -57% | -$34.7M |
|
495
PUT
KB Home
KBH
$3.46B
| $24.6M | 0.02% |
530,600
-44,100
| -8% | -$2.24M |
|
496
PUT
Align Technology
ALGN
$12.4B
| $24.5M | 0.02% |
80,300
+9,200
| +13% | +$3.18M |
|
497
CALL
Take-Two Interactive
TTWO
$43.4B
| $24.5M | 0.02% |
174,500
+15,200
| +10% | +$2.19M |
|
498
CALL
Edwards Lifesciences
EW
$48.6B
| $24.5M | 0.02% |
353,000
+235,400
| +200% | +$18.9M |
|
499
PUT
Proshares UltraShort Technology
REW
$3.3M
| $24.4M | 0.02% |
159,025
-8,175
| -5% | -$682K |
|
|
500
CALL
Darden Restaurants
DRI
$22.2B
| $24.4M | 0.02% |
170,400
+70,300
| +70% | +$11.1M |
|
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.