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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4801
CALL
IAMGOLD
IAG
$8.05B
| $76K | ﹤0.01% |
204
+72
| +55% | +$255 |
|
4802
Invesco Mortgage Capital
IVR
$759M
| $76K | ﹤0.01% |
457
+265
| +138% | +$42.5K |
|
4803
Middleby
MIDD
$6.01B
| $76K | ﹤0.01% |
700
-7,497
| -91% | -$860K |
|
|
NOA
4804
CALL
North American Construction
NOA
$357M
| $76K | ﹤0.01% |
63
+55
| +688% | +$613 |
|
4805
PUT
Prestige Consumer Healthcare
PBH
$2.47B
| $76K | ﹤0.01% |
19
-130
| -87% | -$4.85K |
|
4806
CALL
Silicon Motion
SIMO
$7.11B
| $76K | ﹤0.01% |
15
-139
| -90% | -$5.96K |
|
4807
Sonida Senior Living
SNDA
$1.93B
| $76K | ﹤0.01% |
1,644
+1,638
| +27,300% | +$95.7K |
|
4808
CALL
Smith & Wesson
SWBI
$649M
| $76K | ﹤0.01% |
107
-61
| -36% | -$372 |
|
4809
CALL
Telephone and Data Systems
TDS
$3.87B
| $76K | ﹤0.01% |
30
+25
| +500% | +$613 |
|
4810
CALL
Tronox
TROX
$967M
| $76K | ﹤0.01% |
67
-20
| -23% | -$200 |
|
4811
UFP Industries
UFPI
$4.95B
| $76K | ﹤0.01% |
1,609
+924
| +135% | +$43.5K |
|
|
VNET
4812
VNET Group
VNET
$1.79B
| $76K | ﹤0.01% |
10,492
-20,560
| -66% | -$156K |
|
4813
CALL
W.R. Berkley
WRB
$28.1B
| $76K | ﹤0.01% |
25
-22
| -47% | -$679 |
|
|
ACOR
4814
CALL
DELISTED
Acorda Therapeutics
ACOR
| $76K | ﹤0.01% |
3
+1
| +50% | +$252 |
|
|
TWTR
4815
DELISTED
Twitter, Inc.
TWTR
| $76K | ﹤0.01% |
+2,372
| New | +$78K |
|
|
VAR
4816
DELISTED
Varian Medical Systems, Inc.
VAR
| $76K | ﹤0.01% |
540
-1,695
| -76% | -$216K |
|
4817
CALL
Acco Brands
ACCO
$399M
| $75K | ﹤0.01% |
81
-453
| -85% | -$4.29K |
|
|
AHRT
4818
AH Realty Trust
AHRT
$536M
| $75K | ﹤0.01% |
+4,130
| New | +$75K |
|
4819
PUT
Artivion
AORT
$1.34B
| $75K | ﹤0.01% |
28
-14
| -33% | -$344 |
|
|
CLDT
4820
PUT
Chatham Lodging
CLDT
$632M
| $75K | ﹤0.01% |
41
-18
| -31% | -$325 |
|
4821
CALL
Exponent
EXPO
$3.19B
| $75K | ﹤0.01% |
11
-3
| -21% | -$198 |
|
|
ICAD
4822
CALL
DELISTED
iCAD Inc
ICAD
| $75K | ﹤0.01% |
97
+73
| +304% | +$521 |
|
4823
PUT
Natural Health Trends
NHTC
$14.8M
| $75K | ﹤0.01% |
141
-112
| -44% | -$716 |
|
4824
Champion Homes
SKY
$4.41B
| $75K | ﹤0.01% |
2,379
-6,022
| -72% | -$188K |
|
|
4825
Telephone and Data Systems
TDS
$3.87B
| $75K | ﹤0.01% |
2,977
-1,375
| -32% | -$33.7K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.