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 | |
|---|---|---|---|---|---|---|
3351
iShares US Medical Devices ETF
IHI
$3.06B
| $462K | ﹤0.01% |
8,575
-2,105
| -20% | -$112K |
|
|
ICPT
3352
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $462K | ﹤0.01% |
+34,462
| New | +$596K |
|
|
VSTO
3353
CALL
DELISTED
Vista Outdoor Inc.
VSTO
| $462K | ﹤0.01% |
16,700
+4,000
| +31% | +$110K |
|
3354
PUT
Arch Capital
ACGL
$36.3B
| $461K | ﹤0.01% |
6,800
+5,900
| +656% | +$388K |
|
3355
CALL
HEICO Corp Class A
HEI.A
$36.3B
| $461K | ﹤0.01% |
2,700
| – | – |
|
|
HIVE
3356
CALL
HIVE Digital Technologies
HIVE
$789M
| $461K | ﹤0.01% |
140,200
-64,100
| -31% | -$190K |
|
3357
PUT
Martin Marietta Materials
MLM
$34.3B
| $461K | ﹤0.01% |
1,300
-400
| -24% | -$140K |
|
3358
Molina Healthcare
MOH
$10.4B
| $461K | ﹤0.01% |
+1,727
| New | +$496K |
|
3359
RingCentral
RNG
$4.5B
| $461K | ﹤0.01% |
+15,062
| New | +$539K |
|
|
AHRT
3360
CALL
AH Realty Trust
AHRT
$536M
| $460K | ﹤0.01% |
39,000
+8,400
| +27% | +$103K |
|
3361
CALL
Essex Property Trust
ESS
$18.7B
| $460K | ﹤0.01% |
2,200
+600
| +38% | +$132K |
|
3362
CALL
Brookfield Asset Management
BAM
$75.9B
| $458K | ﹤0.01% |
+14,000
| New | +$455K |
|
3363
Church & Dwight Co
CHD
$23.4B
| $458K | ﹤0.01% |
+5,190
| New | +$433K |
|
3364
PUT
Calumet Specialty Products
CLMT
$3.6B
| $458K | ﹤0.01% |
26,400
-38,300
| -59% | -$680K |
|
3365
Stratasys
SSYS
$700M
| $458K | ﹤0.01% |
27,729
-31,056
| -53% | -$438K |
|
3366
United States Brent Oil Fund
BNO
$755M
| $457K | ﹤0.01% |
17,209
-23,662
| -58% | -$641K |
|
|
JNPR
3367
PUT
DELISTED
Juniper Networks
JNPR
| $457K | ﹤0.01% |
13,300
-4,200
| -24% | -$133K |
|
|
ORGN
3368
DELISTED
Origin Materials
ORGN
| $457K | ﹤0.01% |
3,573
+1,449
| +68% | +$214K |
|
3369
CALL
Blue Owl Capital
OWL
$6.54B
| $457K | ﹤0.01% |
41,300
-35,500
| -46% | -$425K |
|
|
IMGN
3370
DELISTED
Immunogen Inc
IMGN
| $457K | ﹤0.01% |
119,012
+57,332
| +93% | +$244K |
|
3371
PUT
Host Hotels & Resorts
HST
$17.1B
| $456K | ﹤0.01% |
27,700
-74,400
| -73% | -$1.27M |
|
3372
Vanguard Mid-Cap ETF
VO
$107B
| $456K | ﹤0.01% |
8,648
-636
| -7% | -$33.8K |
|
|
WW
3373
PUT
DELISTED
WW International
WW
| $456K | ﹤0.01% |
110,700
+100,700
| +1,007% | +$440K |
|
3374
CALL
NOV
NOV
$7.35B
| $453K | ﹤0.01% |
24,500
-38,800
| -61% | -$838K |
|
3375
Organon & Co
OGN
$3.56B
| $453K | ﹤0.01% |
+19,295
| New | +$518K |
|
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.