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 | |
|---|---|---|---|---|---|---|
3826
CALL
Protolabs
PRLB
$1.78B
| $304K | ﹤0.01% |
8,700
-1,500
| -15% | -$47.8K |
|
|
SCPH
3827
CALL
DELISTED
scPharmaceuticals
SCPH
| $304K | ﹤0.01% |
29,900
+4,100
| +16% | +$42.8K |
|
3828
CALL
STAG Industrial
STAG
$7.79B
| $304K | ﹤0.01% |
8,500
-3,800
| -31% | -$131K |
|
|
3829
PUT
STAG Industrial
STAG
$7.79B
| $304K | ﹤0.01% |
8,500
-14,800
| -64% | -$512K |
|
3830
PUT
Veru
VERU
$35.8M
| $304K | ﹤0.01% |
25,630
+410
| +2% | +$4.8K |
|
3831
CALL
Allegiant Air
ALGT
$2.73B
| $303K | ﹤0.01% |
2,400
+500
| +26% | +$52.3K |
|
3832
iQIYI
IQ
$1.21B
| $303K | ﹤0.01% |
+56,812
| New | +$319K |
|
3833
Manhattan Associates
MANH
$9.95B
| $303K | ﹤0.01% |
+1,516
| New | +$263K |
|
|
AIRC
3834
PUT
DELISTED
Apartment Income REIT Corp.
AIRC
| $303K | ﹤0.01% |
8,400
-4,900
| -37% | -$175K |
|
3835
CALL
Build-A-Bear
BBW
$443M
| $302K | ﹤0.01% |
14,100
-7,800
| -36% | -$171K |
|
3836
CALL
Brookfield Infrastructure Partners
BIP
$19.3B
| $302K | ﹤0.01% |
8,300
+5,700
| +219% | +$203K |
|
3837
PUT
Harrow
HROW
$1.47B
| $302K | ﹤0.01% |
+15,900
| New | +$350K |
|
3838
CALL
Sabra Healthcare REIT
SBRA
$5.61B
| $302K | ﹤0.01% |
25,700
-9,100
| -26% | -$104K |
|
3839
Arlo Technologies
ARLO
$1.55B
| $301K | ﹤0.01% |
27,655
+26,024
| +1,596% | +$212K |
|
3840
dLocal
DLO
$4.38B
| $301K | ﹤0.01% |
+24,702
| New | +$326K |
|
3841
CALL
Denison Mines
DNN
$2.49B
| $301K | ﹤0.01% |
241,100
+7,300
| +3% | +$8.11K |
|
|
DX
3842
Dynex Capital
DX
$3.07B
| $301K | ﹤0.01% |
23,984
-10,239
| -30% | -$120K |
|
3843
CALL
Eastman Chemical
EMN
$7.79B
| $301K | ﹤0.01% |
3,600
-16,400
| -82% | -$1.33M |
|
3844
CALL
United Natural Foods
UNFI
$3.07B
| $301K | ﹤0.01% |
15,400
-9,400
| -38% | -$236K |
|
|
EDR
3845
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $301K | ﹤0.01% |
+12,608
| New | +$297K |
|
3846
PUT
WisdomTree US Total Dividend Fund
DTD
$1.66B
| $300K | ﹤0.01% |
3,900
+300
| +8% | +$18.2K |
|
3847
CALL
Immatics
IMTX
$1.19B
| $300K | ﹤0.01% |
26,000
+16,000
| +160% | +$149K |
|
3848
CALL
SIGA Technologies
SIGA
$240M
| $300K | ﹤0.01% |
59,600
+5,900
| +11% | +$33.5K |
|
|
GOOS
3849
PUT
Canada Goose Holdings
GOOS
$903M
| $299K | ﹤0.01% |
16,800
-43,200
| -72% | -$777K |
|
3850
PUT
Kosmos Energy
KOS
$1.39B
| $299K | ﹤0.01% |
50,000
+24,300
| +95% | +$158K |
|
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.