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 |
Walmart Inc
WMT
|
+$43.6M |
| 2 |
Apple
AAPL
|
+$40.9M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$37.7M |
| 4 |
Citigroup
C
|
+$34.2M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$32.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$189M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 3 |
NVIDIA
NVDA
|
+$115M |
| 4 |
Tesla
TSLA
|
+$52M |
| 5 |
Meta Platforms (Facebook)
META
|
+$49M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.42% |
| 2 | Consumer Discretionary | 0.2% |
| 3 | Healthcare | 0.17% |
| 4 | Industrials | 0.15% |
| 5 | Communication Services | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2526
PUT
Insulet
PODD
$11.3B
| $1.08M | ﹤0.01% |
3,400
-5,700
| -63% | -$1.69M |
|
|
SBOW
2527
DELISTED
SilverBow Resources, Inc.
SBOW
| $1.08M | ﹤0.01% |
47,353
+27,083
| +134% | +$669K |
|
2528
CALL
Aclaris Therapeutics
ACRS
$730M
| $1.08M | ﹤0.01% |
133,600
+133,300
| +44,433% | +$1.69M |
|
|
PLL
2529
PUT
DELISTED
Piedmont Lithium
PLL
| $1.08M | ﹤0.01% |
18,000
+16,800
| +1,400% | +$1.02M |
|
2530
CALL
Huazhu Hotels Group
HTHT
$12.4B
| $1.08M | ﹤0.01% |
22,000
-14,100
| -39% | -$683K |
|
2531
CALL
Toyota
TM
$210B
| $1.08M | ﹤0.01% |
7,600
+400
| +6% | +$56.2K |
|
2532
Elastic
ESTC
$6.1B
| $1.07M | ﹤0.01% |
18,559
+14,669
| +377% | +$836K |
|
|
AMAM
2533
DELISTED
Ambrx Biopharma Inc
AMAM
| $1.07M | ﹤0.01% |
120,204
+109,159
| +988% | +$549K |
|
2534
PUT
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $1.07M | ﹤0.01% |
23,700
+17,700
| +295% | +$826K |
|
2535
CALL
Primerica
PRI
$9.81B
| $1.07M | ﹤0.01% |
6,200
+5,700
| +1,140% | +$934K |
|
|
RETA
2536
DELISTED
Reata Pharmaceuticals, Inc. Class A Common Stock
RETA
| $1.07M | ﹤0.01% |
11,741
-4,009
| -25% | -$235K |
|
|
ESTE
2537
CALL
DELISTED
Earthstone Energy Inc. Class A Common Stock
ESTE
| $1.07M | ﹤0.01% |
82,000
+3,900
| +5% | +$52.3K |
|
2538
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $1.06M | ﹤0.01% |
55,200
-493,700
| -90% | -$10.1M |
|
2539
Valaris
VAL
$5.51B
| $1.06M | ﹤0.01% |
+16,340
| New | +$1.14M |
|
2540
PUT
Vulcan Materials
VMC
$36.3B
| $1.06M | ﹤0.01% |
6,200
+4,000
| +182% | +$710K |
|
2541
TG Therapeutics
TGTX
$8.58B
| $1.06M | ﹤0.01% |
70,670
-205,114
| -74% | -$3.12M |
|
|
MACK
2542
PUT
DELISTED
Merrimack Pharmaceuticals, Inc.
MACK
| $1.06M | ﹤0.01% |
86,200
+21,600
| +33% | +$254K |
|
|
LNW
2543
CALL
DELISTED
Light & Wonder
LNW
| $1.06M | ﹤0.01% |
17,600
-60,900
| -78% | -$3.75M |
|
2544
CALL
OneWater Marine
ONEW
$214M
| $1.05M | ﹤0.01% |
37,600
+37,300
| +12,433% | +$1.06M |
|
2545
PUT
QuidelOrtho
QDEL
$1.09B
| $1.05M | ﹤0.01% |
11,800
+3,100
| +36% | +$270K |
|
2546
CALL
Schrodinger
SDGR
$1.12B
| $1.05M | ﹤0.01% |
39,900
+16,600
| +71% | +$394K |
|
2547
PUT
Cabot Corp
CBT
$4.65B
| $1.05M | ﹤0.01% |
13,700
+13,600
| +13,600% | +$1.02M |
|
2548
CALL
Century Aluminum
CENX
$4.57B
| $1.05M | ﹤0.01% |
104,900
+68,500
| +188% | +$710K |
|
2549
CALL
Magna International
MGA
$17.9B
| $1.05M | ﹤0.01% |
19,600
+5,700
| +41% | +$330K |
|
|
TELL
2550
CALL
DELISTED
Tellurian Inc.
TELL
| $1.05M | ﹤0.01% |
852,400
-428,500
| -33% | -$682K |
|
Similar funds
Simplex Trading's Q1 2023 Portfolio in Review
As of Q1 2023, Simplex Trading held 10,803 positions worth $114B, up 24% from $91.9B the previous quarter. Its ten largest holdings account for 38% of the portfolio.
Simplex Trading deployed $10.1B of net new capital in Q1 2023, opening 1,536 new positions and adding to 3,665 existing holdings. Its largest new stake was Walmart Inc: 918,957 shares worth $45.2M.
By sector, the portfolio is most concentrated in Technology at 0.42% of assets, up from 0.35% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Meta Platforms (Facebook), an estimated $49M trimmed.
- Simplex Trading's largest Q1 2023 buy was Walmart Inc: 918,957 shares worth $45.2M.
- Simplex Trading added most to Apple in Q1 2023, an estimated $40.9M increase.
- Simplex Trading's biggest Q1 2023 reduction was Meta Platforms (Facebook), cutting an estimated $49M.
- Simplex Trading fully exited Amazon in Q1 2023, selling an estimated $189M.
- Simplex Trading's ten largest holdings make up 38% of its $114B portfolio in Q1 2023.
- Simplex Trading opened 1,536 new positions and closed 1,729 in Q1 2023.
- Simplex Trading's portfolio value rose 24% quarter-over-quarter to $114B.
Based on Simplex Trading's 13F filing for Q1 2023, filed 27 Apr 2023.