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 | |
|---|---|---|---|---|---|---|
5076
PUT
Kodak
KODK
$819M
| $100K | ﹤0.01% |
21,800
+15,800
| +263% | +$66.6K |
|
5077
PUT
Ligand Pharmaceuticals
LGND
$5.94B
| $100K | ﹤0.01% |
+1,400
| New | +$105K |
|
5078
Newegg Commerce
NEGG
$270M
| $100K | ﹤0.01% |
+4,285
| New | +$96.6K |
|
5079
PUT
Natural Resource Partners
NRP
$1.31B
| $100K | ﹤0.01% |
1,900
-14,100
| -88% | -$709K |
|
|
OTLY
5080
PUT
Oatly Group
OTLY
$460M
| $100K | ﹤0.01% |
2,445
-230
| -9% | -$9.4K |
|
5081
CALL
Redwire
RDW
$2.02B
| $100K | ﹤0.01% |
39,500
-12,700
| -24% | -$34.6K |
|
|
SCS
5082
PUT
DELISTED
Steelcase
SCS
| $100K | ﹤0.01% |
13,000
+9,700
| +294% | +$73.3K |
|
|
TRTX
5083
CALL
TPG RE Finance Trust
TRTX
$628M
| $100K | ﹤0.01% |
13,600
+12,800
| +1,600% | +$86.7K |
|
5084
CALL
Artivion
AORT
$1.34B
| $99K | ﹤0.01% |
5,800
+3,800
| +190% | +$56K |
|
5085
PUT
Cellebrite
CLBT
$3.63B
| $99K | ﹤0.01% |
13,800
+600
| +5% | +$3.5K |
|
5086
CALL
CNO Financial Group
CNO
$4.99B
| $99K | ﹤0.01% |
4,200
+2,600
| +163% | +$57.9K |
|
5087
Domo
DOMO
$174M
| $99K | ﹤0.01% |
6,768
-657
| -9% | -$9.7K |
|
5088
PUT
Eldorado Gold
EGO
$8.53B
| $99K | ﹤0.01% |
9,900
-2,200
| -18% | -$23.3K |
|
5089
Grab
GRAB
$13.9B
| $99K | ﹤0.01% |
29,039
-171,968
| -86% | -$535K |
|
|
HEES
5090
DELISTED
H&E Equipment Services
HEES
| $99K | ﹤0.01% |
+2,166
| New | +$86.5K |
|
5091
CALL
National Health Investors
NHI
$3.69B
| $99K | ﹤0.01% |
1,900
+400
| +27% | +$20.6K |
|
5092
Silicon Motion
SIMO
$8.65B
| $99K | ﹤0.01% |
1,386
-19,186
| -93% | -$1.23M |
|
5093
Silicon Laboratories
SLAB
$7.15B
| $99K | ﹤0.01% |
+631
| New | +$95.3K |
|
|
BCLI
5094
PUT
DELISTED
BRAINSTORM CELL THERAPUTC
BCLI
| $98K | ﹤0.01% |
3,200
+2,153
| +206% | +$89.2K |
|
|
CMRC
5095
Commerce.com Inc Series 1
CMRC
$261M
| $98K | ﹤0.01% |
9,873
+7,685
| +351% | +$64.1K |
|
5096
PUT
Brookfield Infrastructure Partners
BIP
$19.5B
| $98K | ﹤0.01% |
2,700
-2,600
| -49% | -$92.7K |
|
5097
CALL
Cabaletta Bio
CABA
$444M
| $98K | ﹤0.01% |
7,600
-4,400
| -37% | -$47.8K |
|
|
CHMI
5098
CALL
Cherry Hill Mortgage Investment Corp
CHMI
$82.7M
| $98K | ﹤0.01% |
20,400
+100
| +0.5% | +$515 |
|
5099
PUT
Extreme Networks
EXTR
$3.9B
| $98K | ﹤0.01% |
3,800
+1,900
| +100% | +$37.5K |
|
5100
Global Net Lease
GNL
$1.86B
| $98K | ﹤0.01% |
+9,541
| New | +$103K |
|
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.