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 | |
|---|---|---|---|---|---|---|
3426
Invesco Mortgage Capital
IVR
$762M
| $429K | ﹤0.01% |
38,703
+21,981
| +131% | +$283K |
|
3427
CALL
Calix
CALX
$2.32B
| $428K | ﹤0.01% |
8,000
-20,000
| -71% | -$1.09M |
|
|
BIG
3428
PUT
DELISTED
Big Lots, Inc.
BIG
| $428K | ﹤0.01% |
39,100
-226,700
| -85% | -$3.43M |
|
|
CTLT
3429
DELISTED
CATALENT, INC.
CTLT
| $427K | ﹤0.01% |
+6,513
| New | +$402K |
|
3430
Amphenol
APH
$184B
| $426K | ﹤0.01% |
10,440
+7,234
| +226% | +$286K |
|
3431
CALL
Sanmina
SANM
$11.2B
| $426K | ﹤0.01% |
7,000
+6,000
| +600% | +$359K |
|
3432
CALL
Terex
TEX
$7.89B
| $425K | ﹤0.01% |
8,800
-2,900
| -25% | -$148K |
|
|
AIRC
3433
DELISTED
Apartment Income REIT Corp.
AIRC
| $425K | ﹤0.01% |
11,873
+4,767
| +67% | +$175K |
|
|
IMGN
3434
PUT
DELISTED
Immunogen Inc
IMGN
| $423K | ﹤0.01% |
110,200
+105,700
| +2,349% | +$451K |
|
3435
CALL
BOK Financial
BOKF
$8.58B
| $422K | ﹤0.01% |
5,000
| – | – |
|
3436
CALL
Eastern Bankshares
EBC
$5.29B
| $422K | ﹤0.01% |
33,500
-27,700
| -45% | -$427K |
|
3437
Solid Power
SLDP
$481M
| $422K | ﹤0.01% |
140,228
+19,487
| +16% | +$58.8K |
|
3438
Sprott Uranium Miners ETF
URNM
$1.81B
| $422K | ﹤0.01% |
13,453
+6,006
| +81% | +$201K |
|
|
FORG
3439
CALL
DELISTED
ForgeRock, Inc.
FORG
| $422K | ﹤0.01% |
20,500
-24,700
| -55% | -$502K |
|
3440
PUT
Alliance Resource Partners
ARLP
$3.3B
| $421K | ﹤0.01% |
20,900
+10,100
| +94% | +$207K |
|
3441
CALL
Lumentum
LITE
$55.4B
| $421K | ﹤0.01% |
7,800
-42,900
| -85% | -$2.39M |
|
3442
PUT
Corsair Gaming
CRSR
$1.13B
| $420K | ﹤0.01% |
22,900
+8,800
| +62% | +$143K |
|
3443
CALL
PetMed Express
PETS
$42.1M
| $420K | ﹤0.01% |
25,900
-9,000
| -26% | -$169K |
|
3444
Rollins
ROL
$18.8B
| $420K | ﹤0.01% |
+11,205
| New | +$404K |
|
3445
Collegium Pharmaceutical
COLL
$1.15B
| $419K | ﹤0.01% |
+17,483
| New | +$464K |
|
3446
PUT
RUM Group Inc
RUM
$1.67B
| $419K | ﹤0.01% |
41,900
-40,200
| -49% | -$362K |
|
|
ARI
3447
CALL
Apollo Commercial Real Estate
ARI
$876M
| $418K | ﹤0.01% |
45,000
-1,400
| -3% | -$15.5K |
|
3448
EPAM Systems
EPAM
$4.92B
| $418K | ﹤0.01% |
+1,398
| New | +$450K |
|
3449
iShares US Regional Banks ETF
IAT
$673M
| $418K | ﹤0.01% |
11,705
+9,825
| +523% | +$459K |
|
|
PSTL
3450
CALL
Postal Realty Trust
PSTL
$722M
| $418K | ﹤0.01% |
27,500
+20,600
| +299% | +$309K |
|
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.