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 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3426
CALL
Patrick Industries
PATK
$2.81B
| $792K | ﹤0.01% |
15,750
| – | – |
|
|
MYOV
3427
PUT
DELISTED
Myovant Sciences Ltd.
MYOV
| $792K | ﹤0.01% |
34,800
| – | – |
|
3428
PUT
Flex
FLEX
$42.5B
| $791K | ﹤0.01% |
59,052
| – | – |
|
3429
CALL
Telos
TLS
$346M
| $791K | ﹤0.01% |
24,100
-400
| -2% | -$12K |
|
3430
CALL
Alignment Healthcare
ALHC
$3.86B
| $790K | ﹤0.01% |
34,700
| – | – |
|
3431
CALL
Inseego
INSG
$114M
| $790K | ﹤0.01% |
8,160
+440
| +6% | +$36.8K |
|
3432
CALL
Agios Pharmaceuticals
AGIO
$2.2B
| $789K | ﹤0.01% |
14,000
+100
| +0.7% | +$4.83K |
|
3433
PUT
Antero Midstream
AM
$10.4B
| $789K | ﹤0.01% |
74,600
| – | – |
|
3434
CALL
Neogen
NEOG
$2.03B
| $789K | ﹤0.01% |
17,100
| – | – |
|
3435
Coeur Mining
CDE
$15.8B
| $788K | ﹤0.01% |
89,301
-6,644
| -7% | -$47.2K |
|
3436
PUT
XP
XP
$8.65B
| $788K | ﹤0.01% |
18,600
+400
| +2% | +$17.9K |
|
3437
PUT
PubMatic
PUBM
$594M
| $787K | ﹤0.01% |
21,400
+300
| +1% | +$9K |
|
3438
American International
AIG
$42B
| $785K | ﹤0.01% |
16,267
+710
| +5% | +$36.6K |
|
3439
PUT
PBF Energy
PBF
$7.43B
| $784K | ﹤0.01% |
51,800
| – | – |
|
|
DOC
3440
PUT
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $783K | ﹤0.01% |
42,800
+100
| +0.2% | +$1.85K |
|
3441
CALL
G-III Apparel Group
GIII
$1.52B
| $782K | ﹤0.01% |
24,000
| – | – |
|
3442
CALL
Global Net Lease
GNL
$1.87B
| $782K | ﹤0.01% |
41,800
+500
| +1% | +$8.78K |
|
|
SNBR
3443
CALL
DELISTED
Sleep Number
SNBR
| $782K | ﹤0.01% |
7,100
+200
| +3% | +$19.8K |
|
|
ABMD
3444
PUT
DELISTED
Abiomed Inc
ABMD
| $782K | ﹤0.01% |
2,500
+100
| +4% | +$33.9K |
|
3445
CALL
Xerox
XRX
$357M
| $781K | ﹤0.01% |
32,800
-200
| -0.6% | -$4.54K |
|
3446
Leslie's
LESL
$10.8M
| $780K | ﹤0.01% |
1,411
-15
| -1% | -$7.18K |
|
|
UFS
3447
PUT
DELISTED
DOMTAR CORPORATION (New)
UFS
| $778K | ﹤0.01% |
14,200
| – | – |
|
3448
CALL
Coursera
COUR
$1.61B
| $777K | ﹤0.01% |
19,900
+2,600
| +15% | +$97.9K |
|
3449
PUT
PureCycle Technologies
PCT
$1.2B
| $776K | ﹤0.01% |
31,700
+400
| +1% | +$6.03K |
|
3450
ProShares Ultra Technology
ROM
$1.11B
| $776K | ﹤0.01% |
16,118
| – | – |
|
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 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- 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 86 new positions and closed 271 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.