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 | |
|---|---|---|---|---|---|---|
4651
CALL
Viant Technology
DSP
$229M
| $145K | ﹤0.01% |
31,500
+31,200
| +10,400% | +$138K |
|
4652
CALL
Gossamer Bio
GOSS
$101M
| $145K | ﹤0.01% |
121,100
-226,600
| -65% | -$282K |
|
4653
CALL
Regenxbio
RGNX
$616M
| $145K | ﹤0.01% |
7,300
-4,200
| -37% | -$80.9K |
|
4654
PUT
Sigma Lithium
SGML
$1.05B
| $145K | ﹤0.01% |
3,600
-84,900
| -96% | -$3.24M |
|
4655
CALL
Theravance Biopharma
TBPH
$873M
| $145K | ﹤0.01% |
14,100
-59,900
| -81% | -$661K |
|
4656
UFP Industries
UFPI
$4.95B
| $145K | ﹤0.01% |
1,500
+410
| +38% | +$34.2K |
|
4657
CALL
Black Hills Corp
BKH
$5.55B
| $144K | ﹤0.01% |
2,400
-900
| -27% | -$57.1K |
|
4658
PUT
Crescent Energy
CRGY
$3.65B
| $144K | ﹤0.01% |
13,900
-40,800
| -75% | -$437K |
|
4659
PUT
Cemex
CX
$16.9B
| $144K | ﹤0.01% |
20,400
+14,400
| +240% | +$91.6K |
|
4660
PUT
Eastern Bankshares
EBC
$5.27B
| $144K | ﹤0.01% |
11,800
+1,200
| +11% | +$14.2K |
|
4661
CALL
Lazard
LAZ
$3.96B
| $144K | ﹤0.01% |
4,500
-3,100
| -41% | -$95.8K |
|
4662
CALL
Noble Corp
NE
$6.55B
| $144K | ﹤0.01% |
3,500
-60,700
| -95% | -$2.34M |
|
|
4663
Noble Corp
NE
$6.55B
| $144K | ﹤0.01% |
+3,505
| New | +$135K |
|
4664
CALL
Insulet
PODD
$11.8B
| $144K | ﹤0.01% |
500
-1,000
| -67% | -$304K |
|
4665
CALL
Quad
QUAD
$479M
| $144K | ﹤0.01% |
38,400
+5,600
| +17% | +$20.2K |
|
4666
TORM
TRMD
$3.05B
| $144K | ﹤0.01% |
5,972
-4,229
| -41% | -$118K |
|
4667
CALL
United States Gasoline Fund
UGA
$146M
| $144K | ﹤0.01% |
2,300
+1,100
| +92% | +$66.2K |
|
4668
CALL
Vista Energy
VIST
$7.34B
| $144K | ﹤0.01% |
6,000
-300
| -5% | -$6.52K |
|
|
ALTU
4669
DELISTED
Altitude Acquisition Corp
ALTU
| $144K | ﹤0.01% |
14,333
+2,085
| +17% | +$21K |
|
|
AMRS
4670
PUT
DELISTED
Amyris Inc.
AMRS
| $144K | ﹤0.01% |
140,100
-156,700
| -53% | -$146K |
|
4671
Asure Software
ASUR
$242M
| $143K | ﹤0.01% |
+11,767
| New | +$157K |
|
4672
Axalta
AXTA
$7.45B
| $143K | ﹤0.01% |
4,369
+2,631
| +151% | +$81.6K |
|
4673
Vanguard World Funds Extended Duration ETF
EDV
$3.26B
| $143K | ﹤0.01% |
1,652
+1,612
| +4,030% | +$141K |
|
4674
PUT
Immunocore
IMCR
$1.7B
| $143K | ﹤0.01% |
2,400
-6,300
| -72% | -$360K |
|
4675
Outdoor Holding Co
POWW
$249M
| $143K | ﹤0.01% |
67,226
+23,019
| +52% | +$45K |
|
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.