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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.72% |
| 2 | Technology | 0.49% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.27% |
| 5 | Healthcare | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1576
KLA
KLAC
$242B
| $3.29M | ﹤0.01% |
105,510
-6,730
| -6% | -$225K |
|
1577
Ralph Lauren
RL
$20.9B
| $3.29M | ﹤0.01% |
27,849
-100
| -0.4% | -$11.6K |
|
1578
CALL
Alcon
ALC
$34.1B
| $3.29M | ﹤0.01% |
46,700
-1,800
| -4% | -$139K |
|
1579
PUT
KKR & Co
KKR
$96.7B
| $3.29M | ﹤0.01% |
55,000
| – | – |
|
1580
CALL
QuidelOrtho
QDEL
$958M
| $3.28M | ﹤0.01% |
25,500
+1,000
| +4% | +$134K |
|
|
BTWN
1581
PUT
DELISTED
Bridgetown Holdings Limited Class A Ordinary Shares
BTWN
| $3.27M | ﹤0.01% |
322,300
-13,400
| -4% | -$132K |
|
1582
PUT
American Water Works
AWK
$28B
| $3.27M | ﹤0.01% |
21,000
| – | – |
|
1583
KB Home
KBH
$3.2B
| $3.26M | ﹤0.01% |
78,020
-5,420
| -6% | -$225K |
|
1584
PUT
Burlington
BURL
$16.7B
| $3.26M | ﹤0.01% |
10,000
+100
| +1% | +$32K |
|
1585
PUT
United Parks & Resorts
PRKS
$1.83B
| $3.26M | ﹤0.01% |
63,700
-4,300
| -6% | -$217K |
|
1586
PUT
Churchill Downs
CHDN
$6.07B
| $3.26M | ﹤0.01% |
32,600
| – | – |
|
|
PRPB
1587
CALL
DELISTED
CC Neuberger Principal Holdings II Class A Ordinary Shares
PRPB
| $3.26M | ﹤0.01% |
330,300
| – | – |
|
1588
Bunge Global
BG
$22.8B
| $3.25M | ﹤0.01% |
40,995
+400
| +1% | +$30.9K |
|
1589
CALL
STAG Industrial
STAG
$7.27B
| $3.25M | ﹤0.01% |
87,100
| – | – |
|
1590
Boston Scientific
BSX
$69.3B
| $3.25M | ﹤0.01% |
75,006
+3,093
| +4% | +$137K |
|
1591
PUT
Fulgent Genetics
FLGT
$543M
| $3.24M | ﹤0.01% |
37,100
+300
| +0.8% | +$27.3K |
|
1592
CALL
NovoCure
NVCR
$2.09B
| $3.24M | ﹤0.01% |
17,100
+100
| +0.6% | +$15.1K |
|
|
SGEN
1593
CALL
DELISTED
Seagen Inc. Common Stock
SGEN
| $3.24M | ﹤0.01% |
20,500
| – | – |
|
1594
DoubleVerify
DV
$2.07B
| $3.24M | ﹤0.01% |
78,178
+74,613
| +2,093% | +$2.63M |
|
1595
PUT
VF Corp
VFC
$5.29B
| $3.24M | ﹤0.01% |
38,900
+1,600
| +4% | +$123K |
|
1596
Sherwin-Williams
SHW
$81B
| $3.24M | ﹤0.01% |
11,757
+619
| +6% | +$181K |
|
|
NEWR
1597
CALL
DELISTED
New Relic, Inc.
NEWR
| $3.23M | ﹤0.01% |
48,600
+5,500
| +13% | +$406K |
|
1598
CALL
Insulet
PODD
$10.2B
| $3.23M | ﹤0.01% |
11,600
| – | – |
|
|
AMRS
1599
CALL
DELISTED
Amyris Inc.
AMRS
| $3.23M | ﹤0.01% |
190,200
-300
| -0.2% | -$4.29K |
|
1600
CALL
M&T Bank
MTB
$34.6B
| $3.23M | ﹤0.01% |
21,900
+400
| +2% | +$55.4K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 84 new positions and exited 267, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 84 new positions and closed 267 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.