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 |
Microsoft
MSFT
|
+$53.9M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$52.9M |
| 3 |
NVIDIA
NVDA
|
+$47.1M |
| 4 |
PayPal
PYPL
|
+$41.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$28.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$51.4M |
| 2 |
Walmart Inc
WMT
|
+$46.4M |
| 3 |
VanEck Oil Services ETF
OIH
|
+$34.2M |
| 4 |
Adobe
ADBE
|
+$33.5M |
| 5 |
Starbucks
SBUX
|
+$26.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Healthcare | 0.21% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.2% |
| 5 | Financials | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4376
Magna International
MGA
$18.8B
| $186K | ﹤0.01% |
3,298
-8,674
| -72% | -$460K |
|
|
MTLS
4377
Materialise
MTLS
$366M
| $186K | ﹤0.01% |
21,584
-8,247
| -28% | -$71.3K |
|
4378
Nabors Industries
NBR
$1.17B
| $186K | ﹤0.01% |
2,010
-700
| -26% | -$71.1K |
|
|
CUTR
4379
DELISTED
Cutera, Inc.
CUTR
| $186K | ﹤0.01% |
12,346
-37,148
| -75% | -$704K |
|
|
CPRX
4380
PUT
DELISTED
Catalyst Pharmaceutical
CPRX
| $185K | ﹤0.01% |
13,800
+7,500
| +119% | +$108K |
|
4381
PUT
JFrog
FROG
$8.88B
| $185K | ﹤0.01% |
6,700
-4,000
| -37% | -$91.4K |
|
4382
CALL
The Greenbrier Companies
GBX
$1.57B
| $185K | ﹤0.01% |
4,300
-4,700
| -52% | -$139K |
|
|
HUYA
4383
Huya Inc
HUYA
$558M
| $185K | ﹤0.01% |
51,839
+15,022
| +41% | +$49.4K |
|
4384
CALL
Hyliion Holdings
HYLN
$578M
| $185K | ﹤0.01% |
110,800
-30,000
| -21% | -$50.6K |
|
4385
PUT
Jazz Pharmaceuticals
JAZZ
$16.1B
| $185K | ﹤0.01% |
1,500
-400
| -21% | -$53.8K |
|
|
PPL
4386
PUT
PPL Corp
PPL
$26.9B
| $185K | ﹤0.01% |
7,000
-12,200
| -64% | -$336K |
|
|
TPIC
4387
DELISTED
TPI Composites
TPIC
| $185K | ﹤0.01% |
17,921
+1,144
| +7% | +$12.8K |
|
4388
CALL
Werner Enterprises
WERN
$2.2B
| $185K | ﹤0.01% |
4,200
+3,700
| +740% | +$166K |
|
|
AHT
4389
CALL
Ashford Hospitality Trust
AHT
$20.8M
| $184K | ﹤0.01% |
4,950
+2,380
| +93% | +$89.5K |
|
4390
CALL
InfraCap MLP ETF
AMZA
$466M
| $184K | ﹤0.01% |
7,500
-5,500
| -42% | -$177K |
|
4391
Atomera
ATOM
$173M
| $184K | ﹤0.01% |
21,063
+8,436
| +67% | +$66.6K |
|
|
BAND
4392
PUT
Bandwidth Inc
BAND
$1.18B
| $184K | ﹤0.01% |
13,500
-7,300
| -35% | -$92.1K |
|
4393
PUT
Coherus Oncology
CHRS
$217M
| $184K | ﹤0.01% |
43,200
+39,500
| +1,068% | +$233K |
|
|
PRO
4394
CALL
DELISTED
PROS Holdings
PRO
| $184K | ﹤0.01% |
6,000
+800
| +15% | +$22.5K |
|
4395
PUT
Prospect Capital
PSEC
$1.08B
| $184K | ﹤0.01% |
29,700
+600
| +2% | +$3.86K |
|
|
LILM
4396
CALL
DELISTED
Lilium N.V. Class A Ordinary Shares
LILM
| $184K | ﹤0.01% |
104,900
+24,300
| +30% | +$22.7K |
|
|
ATHX
4397
CALL
DELISTED
Athersys, Inc. Common Stock
ATHX
| $184K | ﹤0.01% |
211,500
-6,600
| -3% | -$5.95K |
|
|
AMWD
4398
CALL
DELISTED
American Woodmark
AMWD
| $183K | ﹤0.01% |
2,400
+1,100
| +85% | +$63.9K |
|
4399
Camping World
CWH
$384M
| $183K | ﹤0.01% |
6,107
-18,002
| -75% | -$453K |
|
4400
CALL
FNB Corp
FNB
$6.76B
| $183K | ﹤0.01% |
16,000
-48,200
| -75% | -$545K |
|
Similar funds
Simplex Trading's Q2 2023 Portfolio in Review
As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
- Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
- Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
- Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
- Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
- Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.
Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.