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 | |
|---|---|---|---|---|---|---|
3876
PUT
LoveSac
LOVE
$248M
| $293K | ﹤0.01% |
10,900
-13,200
| -55% | -$337K |
|
3877
Modine Manufacturing
MOD
$11B
| $293K | ﹤0.01% |
+8,894
| New | +$222K |
|
|
HDRO
3878
DELISTED
Defiance Next Gen H2 ETF
HDRO
| $293K | ﹤0.01% |
4,422
-6,126
| -58% | -$428K |
|
3879
Alto Ingredients
ALTO
$345M
| $292K | ﹤0.01% |
101,310
+37,760
| +59% | +$71.9K |
|
3880
PUT
Jack in the Box
JACK
$308M
| $292K | ﹤0.01% |
3,000
+1,400
| +88% | +$127K |
|
3881
CALL
Kennametal
KMT
$2.71B
| $292K | ﹤0.01% |
10,300
+600
| +6% | +$16.1K |
|
3882
Seres Therapeutics
MCRB
$46.5M
| $292K | ﹤0.01% |
3,051
-2,704
| -47% | -$294K |
|
3883
SLM Corp
SLM
$4.74B
| $292K | ﹤0.01% |
17,912
+9,007
| +101% | +$137K |
|
3884
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.37B
| $292K | ﹤0.01% |
3,180
+2,346
| +281% | +$215K |
|
|
VRN
3885
DELISTED
Veren
VRN
| $292K | ﹤0.01% |
43,434
-28,699
| -40% | -$200K |
|
3886
CALL
ACI Worldwide
ACIW
$6.1B
| $291K | ﹤0.01% |
12,600
-7,200
| -36% | -$174K |
|
3887
Anavex Life Sciences
AVXL
$238M
| $291K | ﹤0.01% |
35,867
-25,338
| -41% | -$217K |
|
3888
The Greenbrier Companies
GBX
$1.6B
| $291K | ﹤0.01% |
+6,774
| New | +$200K |
|
|
BPT
3889
PUT
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $290K | ﹤0.01% |
63,700
+48,600
| +322% | +$292K |
|
3890
CALL
Cipher Digital
CIFR
$8.35B
| $290K | ﹤0.01% |
101,700
+71,100
| +232% | +$175K |
|
3891
Invesco Mortgage Capital
IVR
$769M
| $290K | ﹤0.01% |
25,344
-13,359
| -35% | -$143K |
|
|
MESO
3892
Mesoblast
MESO
$1.87B
| $290K | ﹤0.01% |
37,118
+6,646
| +22% | +$47.5K |
|
3893
CALL
MaxLinear
MXL
$5.35B
| $290K | ﹤0.01% |
9,200
+7,900
| +608% | +$228K |
|
3894
CALL
SM Energy
SM
$7.11B
| $290K | ﹤0.01% |
9,200
-68,600
| -88% | -$1.94M |
|
3895
PUT
SS&C Technologies
SSNC
$18.8B
| $290K | ﹤0.01% |
4,800
-24,000
| -83% | -$1.36M |
|
3896
CALL
Synaptics
SYNA
$4.33B
| $290K | ﹤0.01% |
3,400
+3,200
| +1,600% | +$278K |
|
3897
CALL
Takeda Pharmaceutical
TAK
$56B
| $290K | ﹤0.01% |
18,500
-6,500
| -26% | -$107K |
|
3898
CALL
Uranium Energy
UEC
$4.67B
| $290K | ﹤0.01% |
85,500
+18,300
| +27% | +$52.2K |
|
|
AKRO
3899
CALL
DELISTED
Akero Therapeutics
AKRO
| $289K | ﹤0.01% |
6,200
-14,800
| -70% | -$678K |
|
3900
CALL
Herbalife
HLF
$1.3B
| $289K | ﹤0.01% |
21,900
-1,600
| -7% | -$21.8K |
|
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.