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 | |
|---|---|---|---|---|---|---|
3651
Gildan
GIL
$9.38B
| $220K | ﹤0.01% |
7,451
+7,339
| +6,553% | +$215K |
|
3652
PUT
Novavax
NVAX
$1.23B
| $220K | ﹤0.01% |
555
+221
| +66% | +$959 |
|
|
PENG
3653
PUT
Penguin Solutions Inc
PENG
$2.69B
| $220K | ﹤0.01% |
116
-32
| -22% | -$496 |
|
|
AIMT
3654
PUT
DELISTED
Aimmune Therapeutics
AIMT
| $220K | ﹤0.01% |
66
-299
| -82% | -$8.36K |
|
3655
PUT
Bruker
BRKR
$9.14B
| $219K | ﹤0.01% |
43
+11
| +34% | +$524 |
|
3656
CALL
Comfort Systems
FIX
$60.9B
| $219K | ﹤0.01% |
44
+6
| +16% | +$292 |
|
3657
MakeMyTrip
MMYT
$4.97B
| $219K | ﹤0.01% |
9,581
+8,935
| +1,383% | +$216K |
|
3658
CALL
Movado Group
MOV
$835M
| $219K | ﹤0.01% |
101
+98
| +3,267% | +$2.29K |
|
3659
CALL
Provident Financial Services
PFS
$3.11B
| $219K | ﹤0.01% |
89
+88
| +8,800% | +$2.17K |
|
|
HMSY
3660
CALL
DELISTED
HMS Holdings Corp.
HMSY
| $219K | ﹤0.01% |
74
+31
| +72% | +$951 |
|
3661
CALL
Vanguard Total Bond Market
BND
$158B
| $218K | ﹤0.01% |
27
+24
| +800% | +$2.02K |
|
|
BRFS
3662
PUT
DELISTED
BRF SA
BRFS
| $218K | ﹤0.01% |
251
+178
| +244% | +$1.53K |
|
3663
PUT
Corteva
CTVA
$58.6B
| $218K | ﹤0.01% |
74
-30
| -29% | -$794 |
|
3664
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.91B
| $218K | ﹤0.01% |
68
+53
| +353% | +$1.57K |
|
3665
Lennox International
LII
$19B
| $218K | ﹤0.01% |
+897
| New | +$222K |
|
3666
CALL
Rapid7
RPD
$643M
| $218K | ﹤0.01% |
39
-12
| -24% | -$624 |
|
|
TBCH
3667
Turtle Beach Corp
TBCH
$245M
| $218K | ﹤0.01% |
23,157
+18,499
| +397% | +$182K |
|
|
ENLC
3668
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $218K | ﹤0.01% |
+35,691
| New | +$217K |
|
|
VGR
3669
PUT
DELISTED
Vector Group Ltd.
VGR
| $218K | ﹤0.01% |
230
-51
| -18% | -$446 |
|
|
PYX
3670
PUT
DELISTED
Pyxus International, Inc.
PYX
| $218K | ﹤0.01% |
244
+45
| +23% | +$435 |
|
3671
Axalta
AXTA
$7.22B
| $217K | ﹤0.01% |
+7,153
| New | +$211K |
|
3672
PUT
ICICI Bank
IBN
$107B
| $217K | ﹤0.01% |
144
+111
| +336% | +$1.51K |
|
|
NUVA
3673
CALL
DELISTED
NuVasive, Inc.
NUVA
| $216K | ﹤0.01% |
28
+11
| +65% | +$777 |
|
|
TERP
3674
CALL
DELISTED
TerraForm Power, Inc
TERP
| $216K | ﹤0.01% |
141
-156
| -53% | -$2.51K |
|
3675
M/I Homes
MHO
$3.81B
| $215K | ﹤0.01% |
5,487
+2,757
| +101% | +$115K |
|
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.