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 | |
|---|---|---|---|---|---|---|
3451
CALL
Butterfly Network
BFLY
$1.83B
| $436K | ﹤0.01% |
189,800
+78,100
| +70% | +$175K |
|
3452
iShares Russell Mid-Cap Growth ETF
IWP
$19.7B
| $436K | ﹤0.01% |
4,521
-3,213
| -42% | -$293K |
|
3453
Signet Jewelers
SIG
$3.85B
| $436K | ﹤0.01% |
6,692
-10,160
| -60% | -$704K |
|
3454
CALL
Casella Waste Systems
CWST
$5.78B
| $434K | ﹤0.01% |
4,800
+1,600
| +50% | +$143K |
|
3455
F5
FFIV
$23.2B
| $434K | ﹤0.01% |
+2,971
| New | +$422K |
|
3456
Archer Aviation
ACHR
$3.75B
| $433K | ﹤0.01% |
105,186
+11,659
| +12% | +$32.9K |
|
3457
CALL
Gevo
GEVO
$370M
| $432K | ﹤0.01% |
284,800
+26,800
| +10% | +$34.6K |
|
3458
CALL
Pentair
PNR
$10.6B
| $432K | ﹤0.01% |
6,700
-5,400
| -45% | -$311K |
|
|
SAVE
3459
CALL
DELISTED
Spirit Airlines, Inc.
SAVE
| $432K | ﹤0.01% |
25,200
-83,000
| -77% | -$1.36M |
|
|
DOC
3460
CALL
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $432K | ﹤0.01% |
30,900
-5,200
| -14% | -$73.9K |
|
|
KC
3461
PUT
Kingsoft Cloud Holdings
KC
$3.01B
| $430K | ﹤0.01% |
70,500
+41,700
| +145% | +$248K |
|
3462
Tencent Music
TME
$15.5B
| $430K | ﹤0.01% |
+58,328
| New | +$441K |
|
|
NARI
3463
CALL
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $430K | ﹤0.01% |
7,400
-2,900
| -28% | -$183K |
|
3464
CALL
Arcutis Biotherapeutics
ARQT
$3.5B
| $429K | ﹤0.01% |
45,100
+100
| +0.2% | +$1.11K |
|
3465
Equinox Gold
EQX
$7.25B
| $429K | ﹤0.01% |
93,698
-204,129
| -69% | -$1.02M |
|
|
LICY
3466
CALL
DELISTED
Li-Cycle Holdings Corp.
LICY
| $429K | ﹤0.01% |
9,675
-1,125
| -10% | -$46K |
|
3467
PUT
Intrepid Potash
IPI
$465M
| $428K | ﹤0.01% |
18,900
+13,500
| +250% | +$305K |
|
3468
PUT
PAR Technology
PAR
$723M
| $428K | ﹤0.01% |
13,000
+11,300
| +665% | +$378K |
|
3469
iShares MSCI Mexico ETF
EWW
$1.94B
| $427K | ﹤0.01% |
+6,868
| New | +$420K |
|
3470
CALL
Cactus
WHD
$3.71B
| $427K | ﹤0.01% |
10,100
+6,500
| +181% | +$253K |
|
|
OLK
3471
PUT
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $427K | ﹤0.01% |
22,800
+11,000
| +93% | +$228K |
|
3472
Alliance Resource Partners
ARLP
$3.38B
| $426K | ﹤0.01% |
+23,086
| New | +$443K |
|
3473
PUT
Federal Realty Investment Trust
FRT
$11B
| $425K | ﹤0.01% |
4,400
+2,100
| +91% | +$197K |
|
3474
Immersion
IMMR
$253M
| $425K | ﹤0.01% |
60,084
+30,932
| +106% | +$229K |
|
3475
CALL
Archrock
AROC
$6.1B
| $424K | ﹤0.01% |
41,400
+8,000
| +24% | +$78.9K |
|
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.