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 | |
|---|---|---|---|---|---|---|
6551
PUT
Vontier
VNT
$4.54B
| $25K | ﹤0.01% |
800
+400
| +100% | +$11.5K |
|
6552
Vanguard FTSE Pacific ETF
VPL
$7.77B
| $25K | ﹤0.01% |
360
-22
| -6% | -$1.52K |
|
6553
Direxion Daily Consumer Discretionary Bull 3X ETF
WANT
$14.6M
| $25K | ﹤0.01% |
791
+722
| +1,046% | +$17.7K |
|
6554
Weave Communications
WEAV
$553M
| $25K | ﹤0.01% |
2,307
-5,665
| -71% | -$37.8K |
|
|
INST
6555
PUT
DELISTED
Instructure Holdings, Inc.
INST
| $25K | ﹤0.01% |
1,000
-6,000
| -86% | -$150K |
|
|
AAT
6556
CALL
American Assets Trust
AAT
$1.46B
| $24K | ﹤0.01% |
1,300
+1,200
| +1,200% | +$22.5K |
|
6557
PUT
Adicet Bio
ACET
$77.6M
| $24K | ﹤0.01% |
625
+312
| +100% | +$27.5K |
|
6558
Aclaris Therapeutics
ACRS
$715M
| $24K | ﹤0.01% |
2,343
-123,284
| -98% | -$1.12M |
|
6559
CALL
Adtran
ADTN
$675M
| $24K | ﹤0.01% |
2,300
+1,600
| +229% | +$15.9K |
|
6560
CALL
AtriCure
ATRC
$2.08B
| $24K | ﹤0.01% |
500
| – | – |
|
6561
CALL
Bally's
BALY
$708M
| $24K | ﹤0.01% |
1,600
-31,300
| -95% | -$505K |
|
6562
China Automotive Systems
CAAS
$131M
| $24K | ﹤0.01% |
5,008
-2,201
| -31% | -$10.7K |
|
6563
CALL
CarGurus
CARG
$3.34B
| $24K | ﹤0.01% |
1,100
-537,300
| -100% | -$10.2M |
|
6564
Celanese
CE
$4.82B
| $24K | ﹤0.01% |
208
-2,109
| -91% | -$229K |
|
6565
Cerus
CERS
$575M
| $24K | ﹤0.01% |
10,122
+3,638
| +56% | +$8.64K |
|
|
CIO
6566
CALL
DELISTED
City Office REIT
CIO
| $24K | ﹤0.01% |
4,400
-600
| -12% | -$3.27K |
|
6567
PUT
ClearPoint Neuro
CLPT
$424M
| $24K | ﹤0.01% |
3,400
-5,900
| -63% | -$50.2K |
|
6568
CALL
Caesarstone
CSTE
$69.5M
| $24K | ﹤0.01% |
4,700
-2,000
| -30% | -$9.06K |
|
6569
Global X SuperDividend US ETF
DIV
$792M
| $24K | ﹤0.01% |
+1,440
| New | +$24.2K |
|
6570
Federated Hermes
FHI
$4.56B
| $24K | ﹤0.01% |
691
-30,841
| -98% | -$1.19M |
|
6571
CALL
Geospace Technologies
GEOS
$84M
| $24K | ﹤0.01% |
+3,100
| New | +$24.6K |
|
6572
CALL
Gold Royalty Corp
GROY
$602M
| $24K | ﹤0.01% |
14,000
+12,400
| +775% | +$25.6K |
|
6573
PUT
Harmonic Inc
HLIT
$1.15B
| $24K | ﹤0.01% |
1,500
-500
| -25% | -$8.03K |
|
6574
PUT
Ingles Markets
IMKTA
$1.72B
| $24K | ﹤0.01% |
+300
| New | +$25.8K |
|
6575
CALL
Janus Henderson Small Cap Growth Alpha ETF
JSML
$355M
| $24K | ﹤0.01% |
+500
| New | +$25.8K |
|
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.