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 | |
|---|---|---|---|---|---|---|
4401
CALL
InflaRx
IFRX
$243M
| $183K | ﹤0.01% |
+41,100
| New | +$184K |
|
4402
CALL
NGL Energy Partners
NGL
$1.94B
| $183K | ﹤0.01% |
47,200
+11,500
| +32% | +$37.2K |
|
4403
Napco Security Technologies
NSSC
$1.3B
| $183K | ﹤0.01% |
5,287
-966
| -15% | -$33.7K |
|
4404
CALL
Safe Bulkers
SB
$772M
| $183K | ﹤0.01% |
56,300
-5,000
| -8% | -$17.6K |
|
4405
WD-40
WDFC
$2.98B
| $183K | ﹤0.01% |
+974
| New | +$184K |
|
4406
CALL
Broadridge
BR
$18.4B
| $182K | ﹤0.01% |
1,100
+700
| +175% | +$106K |
|
4407
PUT
Corsair Gaming
CRSR
$1.1B
| $182K | ﹤0.01% |
10,300
-12,600
| -55% | -$230K |
|
4408
iShares MSCI South Africa ETF
EZA
$534M
| $182K | ﹤0.01% |
4,585
+4,485
| +4,485% | +$183K |
|
4409
CALL
Fortuna Silver Mines
FSM
$2.54B
| $182K | ﹤0.01% |
56,200
+6,700
| +14% | +$23.9K |
|
4410
Kratos Defense & Security Solutions
KTOS
$8.23B
| $182K | ﹤0.01% |
12,705
+6,911
| +119% | +$93.6K |
|
4411
PUT
Centrus Energy
LEU
$3.14B
| $182K | ﹤0.01% |
5,600
-2,300
| -29% | -$71.2K |
|
4412
PUT
RadNet
RDNT
$4.98B
| $182K | ﹤0.01% |
5,600
-27,600
| -83% | -$802K |
|
|
SOHU
4413
CALL
Sohu.com
SOHU
$352M
| $182K | ﹤0.01% |
16,600
+4,500
| +37% | +$57K |
|
|
BECN
4414
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $182K | ﹤0.01% |
2,200
-6,500
| -75% | -$429K |
|
4415
PUT
NuScale Power
SMR
$2.63B
| $181K | ﹤0.01% |
26,700
+23,700
| +790% | +$192K |
|
|
VMEO
4416
CALL
DELISTED
Vimeo
VMEO
| $181K | ﹤0.01% |
44,000
+28,300
| +180% | +$107K |
|
4417
PUT
Kilroy Realty
KRC
$4.59B
| $180K | ﹤0.01% |
6,000
-77,600
| -93% | -$2.26M |
|
|
OPRA
4418
PUT
Opera Ltd
OPRA
$1.68B
| $180K | ﹤0.01% |
+9,100
| New | +$130K |
|
4419
CALL
Pacira BioSciences
PCRX
$1.04B
| $180K | ﹤0.01% |
4,500
+3,400
| +309% | +$141K |
|
4420
CALL
Arcus Biosciences
RCUS
$3.33B
| $180K | ﹤0.01% |
8,900
+7,200
| +424% | +$137K |
|
4421
PUT
InfraCap MLP ETF
AMZA
$466M
| $179K | ﹤0.01% |
5,400
+3,300
| +157% | +$106K |
|
|
4422
Centrus Energy
LEU
$3.14B
| $179K | ﹤0.01% |
5,523
-1,068
| -16% | -$33.1K |
|
4423
CALL
Manhattan Associates
MANH
$12.1B
| $179K | ﹤0.01% |
+900
| New | +$156K |
|
|
SJT
4424
PUT
San Juan Basin Royalty Trust
SJT
$119M
| $179K | ﹤0.01% |
24,200
+8,400
| +53% | +$71.2K |
|
4425
Tetra Tech
TTEK
$8.77B
| $179K | ﹤0.01% |
5,470
+5,315
| +3,429% | +$156K |
|
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.