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 | |
|---|---|---|---|---|---|---|
2526
Galicia Financial Group
GGAL
$7.92B
| $1.16M | ﹤0.01% |
+88,743
| New | +$1.45M |
|
2527
PUT
Regal Rexnord
RRX
$14.2B
| $1.16M | ﹤0.01% |
8,100
+7,700
| +1,925% | +$1.19M |
|
2528
CALL
Universal Health Services
UHS
$9.43B
| $1.16M | ﹤0.01% |
9,200
-8,200
| -47% | -$1.12M |
|
|
EH
2529
PUT
EHang Holdings
EH
$372M
| $1.16M | ﹤0.01% |
64,100
+36,700
| +134% | +$676K |
|
2530
PUT
TFI International
TFII
$12.4B
| $1.16M | ﹤0.01% |
9,000
-2,500
| -22% | -$317K |
|
2531
CALL
Tradeweb Markets
TW
$21.3B
| $1.15M | ﹤0.01% |
14,400
+13,900
| +2,780% | +$1.11M |
|
2532
PUT
Mattel
MAT
$4.17B
| $1.15M | ﹤0.01% |
52,300
+28,900
| +124% | +$617K |
|
|
VRNT
2533
DELISTED
Verint Systems
VRNT
| $1.15M | ﹤0.01% |
49,977
+47,596
| +1,999% | +$1.53M |
|
2534
PUT
Sprouts Farmers Market
SFM
$7.04B
| $1.15M | ﹤0.01% |
26,800
+11,600
| +76% | +$455K |
|
2535
PUT
Sphere Entertainment
SPHR
$4.88B
| $1.15M | ﹤0.01% |
31,800
+26,500
| +500% | +$977K |
|
2536
CALL
Alkermes
ALKS
$8.82B
| $1.15M | ﹤0.01% |
40,900
+10,100
| +33% | +$296K |
|
2537
CALL
Amphenol
APH
$188B
| $1.14M | ﹤0.01% |
27,200
+3,400
| +14% | +$146K |
|
2538
PUT
Casey's General Stores
CASY
$31.9B
| $1.14M | ﹤0.01% |
4,200
+3,200
| +320% | +$811K |
|
|
CHX
2539
CALL
DELISTED
ChampionX
CHX
| $1.14M | ﹤0.01% |
32,000
+21,600
| +208% | +$768K |
|
|
HOLI
2540
PUT
DELISTED
Hollsys Automation Technologies INTERNATIONAL, LTD. COMMON (British Virgin Island)
HOLI
| $1.14M | ﹤0.01% |
57,300
+55,500
| +3,083% | +$1M |
|
2541
PUT
McCormick & Company Non-Voting
MKC
$13.4B
| $1.13M | ﹤0.01% |
15,000
-9,800
| -40% | -$819K |
|
2542
AvalonBay Communities
AVB
$27.1B
| $1.13M | ﹤0.01% |
6,592
+4,276
| +185% | +$790K |
|
|
KRTX
2543
CALL
DELISTED
Karuna Therapeutics, Inc. Common Stock
KRTX
| $1.13M | ﹤0.01% |
6,700
-55,200
| -89% | -$10.4M |
|
2544
CALL
Assured Guaranty
AGO
$3.78B
| $1.13M | ﹤0.01% |
18,700
+5,700
| +44% | +$338K |
|
2545
PUT
Newell Brands
NWL
$2.16B
| $1.13M | ﹤0.01% |
125,200
+600
| +0.5% | +$5.97K |
|
2546
CALL
OneMain Financial
OMF
$6.9B
| $1.13M | ﹤0.01% |
28,200
-11,800
| -30% | -$504K |
|
2547
CALL
Customers Bancorp
CUBI
$2.59B
| $1.13M | ﹤0.01% |
32,800
+30,000
| +1,071% | +$1.08M |
|
2548
Align Technology
ALGN
$12B
| $1.13M | ﹤0.01% |
+3,693
| New | +$1.28M |
|
2549
Shake Shack
SHAK
$2.3B
| $1.13M | ﹤0.01% |
+19,417
| New | +$1.38M |
|
2550
Vistra
VST
$55.1B
| $1.13M | ﹤0.01% |
33,911
+11,510
| +51% | +$346K |
|
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.