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 | |
|---|---|---|---|---|---|---|
4201
PUT
Arcutis Biotherapeutics
ARQT
$3.49B
| $217K | ﹤0.01% |
22,800
+22,700
| +22,700% | +$252K |
|
4202
CALL
Celldex Therapeutics
CLDX
$2.88B
| $217K | ﹤0.01% |
6,400
-25,200
| -80% | -$849K |
|
4203
PUT
Collegium Pharmaceutical
COLL
$1.18B
| $217K | ﹤0.01% |
10,100
-18,600
| -65% | -$422K |
|
4204
CALL
Carriage Services
CSV
$642M
| $217K | ﹤0.01% |
6,700
-12,300
| -65% | -$344K |
|
|
ETWO
4205
PUT
DELISTED
E2open Parent Holdings
ETWO
| $217K | ﹤0.01% |
38,800
+38,400
| +9,600% | +$206K |
|
4206
CALL
Intapp
INTA
$2.44B
| $217K | ﹤0.01% |
5,200
+2,200
| +73% | +$94.8K |
|
4207
CALL
IPG Photonics
IPGP
$3.42B
| $217K | ﹤0.01% |
1,600
+800
| +100% | +$94.3K |
|
4208
PDS Biotechnology
PDSB
$36.9M
| $217K | ﹤0.01% |
43,273
+30,994
| +252% | +$203K |
|
|
PMT
4209
PUT
PennyMac Mortgage Investment
PMT
$852M
| $217K | ﹤0.01% |
16,100
-300
| -2% | -$3.67K |
|
4210
CALL
SurgePays
SURG
$5.8M
| $217K | ﹤0.01% |
29,700
-57,300
| -66% | -$341K |
|
4211
CALL
Allegion
ALLE
$13.4B
| $216K | ﹤0.01% |
1,800
+1,200
| +200% | +$131K |
|
4212
PUT
Annexon
ANNX
$803M
| $216K | ﹤0.01% |
61,400
+36,400
| +146% | +$159K |
|
|
FOLD
4213
CALL
DELISTED
Amicus Therapeutics
FOLD
| $216K | ﹤0.01% |
17,200
-13,100
| -43% | -$155K |
|
|
MRSN
4214
DELISTED
Mersana Therapeutics
MRSN
| $216K | ﹤0.01% |
2,634
+812
| +45% | +$119K |
|
4215
CALL
Oshkosh
OSK
$8.94B
| $216K | ﹤0.01% |
2,500
-1,700
| -40% | -$134K |
|
4216
CALL
Suburban Propane Partners
SPH
$1.23B
| $216K | ﹤0.01% |
14,600
-32,800
| -69% | -$496K |
|
|
NVRO
4217
CALL
DELISTED
NEVRO CORP.
NVRO
| $216K | ﹤0.01% |
8,500
+4,600
| +118% | +$133K |
|
4218
Bumble
BMBL
$389M
| $215K | ﹤0.01% |
+12,865
| New | +$222K |
|
4219
ProShares Ultra Dow30
DDM
$532M
| $215K | ﹤0.01% |
6,402
+4,070
| +175% | +$132K |
|
4220
Liquidia Corp
LQDA
$7.76B
| $215K | ﹤0.01% |
27,461
+22,568
| +461% | +$175K |
|
4221
PUT
UGI
UGI
$7.85B
| $215K | ﹤0.01% |
8,000
+2,600
| +48% | +$78.9K |
|
4222
Energy Fuels
UUUU
$2.76B
| $215K | ﹤0.01% |
34,519
-85,631
| -71% | -$503K |
|
|
DCH
4223
PUT
Dauch Corp
DCH
$1.32B
| $214K | ﹤0.01% |
25,900
-52,100
| -67% | -$386K |
|
4224
Equity Residential
EQR
$25.7B
| $214K | ﹤0.01% |
+3,259
| New | +$204K |
|
4225
PUT
Fulgent Genetics
FLGT
$558M
| $214K | ﹤0.01% |
5,800
-4,700
| -45% | -$164K |
|
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.