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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1526
PUT
Ameriprise Financial
AMP
$46.8B
| $5.57M | ﹤0.01% |
12,700
+7,800
| +159% | +$3.12M |
|
1527
CALL
BJs Wholesale Club
BJ
$11.9B
| $5.57M | ﹤0.01% |
73,600
+9,000
| +14% | +$627K |
|
1528
CALL
Elanco Animal Health
ELAN
$12.4B
| $5.56M | ﹤0.01% |
341,300
+54,200
| +19% | +$847K |
|
1529
PUT
Unilever
UL
$131B
| $5.54M | ﹤0.01% |
98,133
-39,645
| -29% | -$2.2M |
|
1530
PUT
Southern Company
SO
$110B
| $5.54M | ﹤0.01% |
77,200
-99,000
| -56% | -$6.83M |
|
1531
CALL
Dave & Buster's
PLAY
$343M
| $5.53M | ﹤0.01% |
88,400
+54,700
| +162% | +$3.14M |
|
1532
CALL
Doximity
DOCS
$3.67B
| $5.53M | ﹤0.01% |
205,600
+13,900
| +7% | +$396K |
|
1533
CALL
SiriusXM
SIRI
$10B
| $5.53M | ﹤0.01% |
142,520
+82,750
| +138% | +$3.93M |
|
1534
PUT
TG Therapeutics
TGTX
$8.58B
| $5.52M | ﹤0.01% |
363,200
+66,900
| +23% | +$1.07M |
|
1535
D.R. Horton
DHI
$41B
| $5.52M | ﹤0.01% |
33,535
+30,726
| +1,094% | +$4.61M |
|
1536
PUT
Enovix
ENVX
$862M
| $5.52M | ﹤0.01% |
787,086
+239,657
| +44% | +$2.08M |
|
1537
PUT
Star Bulk Carriers
SBLK
$3.14B
| $5.51M | ﹤0.01% |
231,000
-17,700
| -7% | -$401K |
|
1538
CALL
argenx
ARGX
$57.4B
| $5.51M | ﹤0.01% |
14,000
-30,600
| -69% | -$11.9M |
|
1539
PUT
Broadridge
BR
$17.2B
| $5.51M | ﹤0.01% |
26,900
+25,300
| +1,581% | +$5.1M |
|
1540
CALL
Ironwood Pharmaceuticals
IRWD
$611M
| $5.5M | ﹤0.01% |
631,500
+446,100
| +241% | +$5.41M |
|
1541
CALL
ZIM Integrated Shipping Services
ZIM
$3B
| $5.5M | ﹤0.01% |
543,500
-493,100
| -48% | -$5.99M |
|
1542
lululemon athletica
LULU
$13B
| $5.49M | ﹤0.01% |
14,052
+10,489
| +294% | +$4.85M |
|
1543
Li Auto
LI
$12.6B
| $5.48M | ﹤0.01% |
181,048
+8,052
| +5% | +$267K |
|
1544
PUT
Royal Gold
RGLD
$17.1B
| $5.48M | ﹤0.01% |
45,000
+28,200
| +168% | +$3.18M |
|
1545
CALL
JB Hunt Transport Services
JBHT
$27.1B
| $5.48M | ﹤0.01% |
27,500
-3,200
| -10% | -$646K |
|
1546
CALL
AutoNation
AN
$6.97B
| $5.46M | ﹤0.01% |
33,000
-41,200
| -56% | -$6.06M |
|
1547
PUT
2x Long VIX Futures ETF
UVIX
$286M
| $5.46M | ﹤0.01% |
1,427
+265
| +23% | +$591K |
|
1548
PUT
Illinois Tool Works
ITW
$81.4B
| $5.45M | ﹤0.01% |
20,300
+1,800
| +10% | +$467K |
|
1549
PUT
Boise Cascade
BCC
$2.74B
| $5.44M | ﹤0.01% |
35,500
+32,000
| +914% | +$4.32M |
|
1550
UiPath
PATH
$5.62B
| $5.44M | ﹤0.01% |
+240,062
| New | +$5.62M |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.