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 | |
|---|---|---|---|---|---|---|
2301
PUT
Shake Shack
SHAK
$2.3B
| $1.37M | ﹤0.01% |
17,600
-1,100
| -6% | -$70.7K |
|
|
VTLE
2302
DELISTED
Vital Energy
VTLE
| $1.37M | ﹤0.01% |
30,270
+11,216
| +59% | +$507K |
|
2303
Thomson Reuters
TRI
$39.4B
| $1.36M | ﹤0.01% |
9,967
+8,394
| +534% | +$1.13M |
|
2304
CALL
Skywest
SKYW
$4.11B
| $1.36M | ﹤0.01% |
33,500
+20,900
| +166% | +$621K |
|
2305
PUT
Grab
GRAB
$13.5B
| $1.36M | ﹤0.01% |
397,400
-134,200
| -25% | -$418K |
|
2306
CALL
Factset
FDS
$9.05B
| $1.36M | ﹤0.01% |
3,400
-1,000
| -23% | -$403K |
|
2307
PUT
Semtech
SMTC
$11.7B
| $1.36M | ﹤0.01% |
53,500
+36,800
| +220% | +$794K |
|
2308
PUT
Insmed
INSM
$23.2B
| $1.36M | ﹤0.01% |
64,500
+44,200
| +218% | +$839K |
|
2309
CALL
Natural Resource Partners
NRP
$1.3B
| $1.36M | ﹤0.01% |
25,800
-17,500
| -40% | -$880K |
|
2310
PUT
Ingersoll Rand
IR
$33B
| $1.36M | ﹤0.01% |
20,800
+15,900
| +324% | +$940K |
|
2311
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $1.36M | ﹤0.01% |
14,600
+8,000
| +121% | +$496K |
|
2312
CALL
CDW
CDW
$17.1B
| $1.36M | ﹤0.01% |
7,400
+2,700
| +57% | +$472K |
|
2313
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $1.36M | ﹤0.01% |
15,200
-44,800
| -75% | -$3.9M |
|
2314
CALL
Bank of Hawaii
BOH
$3.33B
| $1.36M | ﹤0.01% |
32,900
-1,900
| -5% | -$84.1K |
|
|
ONC
2315
PUT
BeOne Medicines Ltd
ONC
$33.8B
| $1.35M | ﹤0.01% |
7,600
+2,200
| +41% | +$507K |
|
2316
CALL
Rockwell Automation
ROK
$51.4B
| $1.35M | ﹤0.01% |
4,100
-6,400
| -61% | -$1.85M |
|
2317
Algoma Steel
ASTL
$455M
| $1.35M | ﹤0.01% |
189,747
+67,030
| +55% | +$498K |
|
2318
CALL
New Fortress Energy
NFE
$101M
| $1.34M | ﹤0.01% |
50,200
+800
| +2% | +$23.2K |
|
2319
Allegiant Air
ALGT
$2.64B
| $1.34M | ﹤0.01% |
10,642
+8,195
| +335% | +$857K |
|
2320
Antero Resources
AR
$10.9B
| $1.34M | ﹤0.01% |
58,306
-76,837
| -57% | -$1.71M |
|
2321
CALL
Manulife Financial
MFC
$72.6B
| $1.34M | ﹤0.01% |
70,800
-45,100
| -39% | -$861K |
|
2322
CALL
Orion
OEC
$394M
| $1.34M | ﹤0.01% |
63,100
-40,500
| -39% | -$976K |
|
2323
CALL
Editas Medicine
EDIT
$399M
| $1.33M | ﹤0.01% |
162,100
+10,500
| +7% | +$91.5K |
|
2324
PUT
Shoals Technologies Group
SHLS
$1.58B
| $1.33M | ﹤0.01% |
52,200
-10,200
| -16% | -$236K |
|
2325
CALL
ACM Research
ACMR
$5.83B
| $1.33M | ﹤0.01% |
101,900
+44,000
| +76% | +$463K |
|
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.