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 | |
|---|---|---|---|---|---|---|
|
CTLT
926
DELISTED
CATALENT, INC.
CTLT
| $9.46M | 0.01% |
218,237
+211,724
| +3,251% | +$9.3M |
|
927
PUT
T. Rowe Price
TROW
$24.6B
| $9.44M | 0.01% |
84,300
+14,900
| +21% | +$1.63M |
|
928
CALL
Teleflex
TFX
$5.81B
| $9.44M | 0.01% |
39,000
+9,700
| +33% | +$2.43M |
|
929
Gilead Sciences
GILD
$162B
| $9.43M | 0.01% |
+122,315
| New | +$9.76M |
|
930
PUT
Steel Dynamics
STLD
$34.7B
| $9.41M | 0.01% |
86,400
-85,800
| -50% | -$8.73M |
|
931
CALL
Realty Income
O
$60.4B
| $9.39M | 0.01% |
157,300
+57,900
| +58% | +$3.53M |
|
|
UCD
932
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $9.39M | 0.01% |
145,200
+25,400
| +21% | +$1.64M |
|
933
CALL
Scotiabank
BNS
$106B
| $9.38M | 0.01% |
187,500
-31,900
| -15% | -$1.58M |
|
934
PUT
Pool Corp
POOL
$6.68B
| $9.37M | 0.01% |
25,000
+16,100
| +181% | +$5.5M |
|
935
CALL
Roper Technologies
ROP
$35.8B
| $9.33M | 0.01% |
19,400
+14,700
| +313% | +$6.66M |
|
936
CALL
Lamb Weston
LW
$6.79B
| $9.31M | 0.01% |
81,000
-21,300
| -21% | -$2.38M |
|
937
CALL
Hilton Worldwide
HLT
$72.9B
| $9.3M | 0.01% |
63,900
-86,700
| -58% | -$12.3M |
|
938
PUT
Fidelity National Information Services
FIS
$20.7B
| $9.29M | 0.01% |
169,800
-319,100
| -65% | -$17.6M |
|
|
XYZ
939
Block Inc
XYZ
$45.5B
| $9.27M | 0.01% |
139,197
-39,306
| -22% | -$2.46M |
|
940
PUT
Silicon Motion
SIMO
$9.8B
| $9.24M | 0.01% |
128,600
+52,400
| +69% | +$3.35M |
|
|
AY
941
CALL
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $9.22M | 0.01% |
393,600
-21,900
| -5% | -$563K |
|
942
CALL
International Paper
IP
$20.1B
| $9.21M | 0.01% |
289,700
+134,700
| +87% | +$4.41M |
|
|
EXAS
943
PUT
DELISTED
Exact Sciences
EXAS
| $9.21M | 0.01% |
98,100
+59,100
| +152% | +$4.61M |
|
944
CALL
Coherent
COHR
$61.3B
| $9.15M | 0.01% |
179,500
+138,600
| +339% | +$5.14M |
|
945
Norwegian Cruise Line
NCLH
$8.59B
| $9.13M | 0.01% |
+419,469
| New | +$6.42M |
|
946
CALL
Bank of Montreal
BMO
$124B
| $9.12M | 0.01% |
101,000
-75,800
| -43% | -$6.7M |
|
947
PUT
Prologis
PLD
$135B
| $9.11M | 0.01% |
74,300
-169,700
| -70% | -$20.9M |
|
948
CrowdStrike
CRWD
$187B
| $9.06M | 0.01% |
246,692
-163,332
| -40% | -$5.69M |
|
949
CALL
Canadian Solar
CSIQ
$997M
| $9.05M | 0.01% |
233,900
+181,300
| +345% | +$7.03M |
|
950
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.6B
| $9.05M | 0.01% |
26,319
-59,515
| -69% | -$20M |
|
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.