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 | |
|---|---|---|---|---|---|---|
4976
Relmada Therapeutics
RLMD
$540M
| $109K | ﹤0.01% |
44,363
+39,859
| +885% | +$110K |
|
4977
PUT
ResMed
RMD
$31.1B
| $109K | ﹤0.01% |
500
-3,900
| -89% | -$869K |
|
4978
PUT
Smith & Nephew
SNN
$13.7B
| $109K | ﹤0.01% |
3,400
+2,400
| +240% | +$74.3K |
|
4979
United Airlines
UAL
$38.8B
| $109K | ﹤0.01% |
2,000
-163,464
| -99% | -$7.72M |
|
|
INVX
4980
CALL
Innovex International
INVX
$1.8B
| $109K | ﹤0.01% |
4,700
-100
| -2% | -$2.55K |
|
|
BIG
4981
PUT
DELISTED
Big Lots, Inc.
BIG
| $109K | ﹤0.01% |
12,400
-26,700
| -68% | -$226K |
|
|
AMAM
4982
DELISTED
Ambrx Biopharma Inc
AMAM
| $109K | ﹤0.01% |
6,634
-113,570
| -94% | -$1.43M |
|
4983
PUT
Beam Global
BEEM
$21.7M
| $108K | ﹤0.01% |
10,500
+5,800
| +123% | +$63.5K |
|
4984
PUT
Chemed
CHE
$7.16B
| $108K | ﹤0.01% |
+200
| New | +$109K |
|
4985
PUT
Celestica
CLS
$37.8B
| $108K | ﹤0.01% |
7,500
-20,800
| -73% | -$257K |
|
4986
PUT
Commault Systems
CVLT
$4.98B
| $108K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$91K |
|
|
TDAY
4987
USA Today Co
TDAY
$1.29B
| $108K | ﹤0.01% |
48,135
+36,510
| +314% | +$72.8K |
|
4988
PUT
LSB Industries
LXU
$824M
| $108K | ﹤0.01% |
11,000
-8,200
| -43% | -$78.5K |
|
4989
MGM Resorts International
MGM
$11.7B
| $108K | ﹤0.01% |
+2,472
| New | +$106K |
|
|
MVO
4990
PUT
DELISTED
MV Oil Trust
MVO
| $108K | ﹤0.01% |
8,500
+5,400
| +174% | +$65K |
|
4991
N-able
NABL
$844M
| $108K | ﹤0.01% |
7,540
+7,476
| +11,681% | +$104K |
|
4992
CALL
Envista
NVST
$4.62B
| $108K | ﹤0.01% |
3,200
-128,900
| -98% | -$4.55M |
|
4993
CALL
Sportsman's Warehouse
SPWH
$44.9M
| $108K | ﹤0.01% |
19,000
-16,300
| -46% | -$98.1K |
|
4994
CALL
Tecnoglass
TGLS
$1.99B
| $108K | ﹤0.01% |
2,100
+200
| +11% | +$8.89K |
|
4995
Zurn Elkay Water Solutions
ZWS
$8.55B
| $108K | ﹤0.01% |
+4,044
| New | +$92.1K |
|
|
ALEX
4996
CALL
DELISTED
Alexander & Baldwin
ALEX
| $107K | ﹤0.01% |
5,800
-2,700
| -32% | -$50.6K |
|
4997
Immunic
IMUX
$178M
| $107K | ﹤0.01% |
4,273
-1,485
| -26% | -$24.9K |
|
4998
CALL
American Century Diversified Corporate Bond ETF
KORP
$869M
| $107K | ﹤0.01% |
1,400
-400
| -22% | -$18.4K |
|
4999
CALL
LoveSac
LOVE
$242M
| $107K | ﹤0.01% |
4,000
-5,700
| -59% | -$145K |
|
5000
PUT
Energy Vault
NRGV
$455M
| $107K | ﹤0.01% |
39,500
+2,300
| +6% | +$4.84K |
|
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.