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 | |
|---|---|---|---|---|---|---|
|
APHA
2676
CALL
DELISTED
Aphria Inc. Common Shares
APHA
| $537K | ﹤0.01% |
1,029
+61
| +6% | +$300 |
|
|
LTHM
2677
DELISTED
Livent Corporation
LTHM
| $536K | ﹤0.01% |
62,741
+56,029
| +835% | +$429K |
|
2678
PUT
Churchill Downs
CHDN
$6.03B
| $535K | ﹤0.01% |
+78
| New | +$5.08K |
|
2679
PUT
LPL Financial
LPLA
$26.3B
| $535K | ﹤0.01% |
58
-119
| -67% | -$10.2K |
|
2680
CALL
Appian
APPN
$1.74B
| $534K | ﹤0.01% |
140
-14
| -9% | -$604 |
|
|
INVX
2681
CALL
Innovex International
INVX
$1.87B
| $534K | ﹤0.01% |
114
+64
| +128% | +$2.93K |
|
2682
CALL
Cheniere Energy
CQP
$31.8B
| $533K | ﹤0.01% |
134
+110
| +458% | +$4.63K |
|
2683
Domo
DOMO
$166M
| $533K | ﹤0.01% |
+24,583
| New | +$454K |
|
2684
CALL
Icon
ICLR
$12.8B
| $533K | ﹤0.01% |
31
+2
| +7% | +$308 |
|
2685
CALL
Insperity
NSP
$1.85B
| $533K | ﹤0.01% |
62
+3
| +5% | +$261 |
|
|
VISN
2686
CALL
Vistance Networks Inc
VISN
$2.66B
| $532K | ﹤0.01% |
375
-559
| -60% | -$7.25K |
|
2687
Kinross Gold
KGC
$28.5B
| $532K | ﹤0.01% |
112,257
+92,640
| +472% | +$418K |
|
2688
Masco
MAS
$16B
| $532K | ﹤0.01% |
11,105
-27,084
| -71% | -$1.23M |
|
|
PMT
2689
CALL
PennyMac Mortgage Investment
PMT
$849M
| $532K | ﹤0.01% |
239
+67
| +39% | +$1.52K |
|
|
RDFN
2690
PUT
DELISTED
Redfin
RDFN
| $532K | ﹤0.01% |
252
-156
| -38% | -$2.99K |
|
2691
CALL
Solid Biosciences
SLDB
$771M
| $532K | ﹤0.01% |
80
+48
| +150% | +$5.3K |
|
|
SUM
2692
CALL
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $532K | ﹤0.01% |
227
-38
| -14% | -$862 |
|
|
PDCE
2693
DELISTED
PDC Energy, Inc.
PDCE
| $532K | ﹤0.01% |
20,363
+19,123
| +1,542% | +$459K |
|
|
EV
2694
CALL
DELISTED
Eaton Vance Corp.
EV
| $532K | ﹤0.01% |
114
-12
| -10% | -$555 |
|
2695
PUT
Broadridge
BR
$17.2B
| $531K | ﹤0.01% |
43
+27
| +169% | +$3.3K |
|
|
PDCE
2696
CALL
DELISTED
PDC Energy, Inc.
PDCE
| $531K | ﹤0.01% |
203
+182
| +867% | +$4.37K |
|
2697
iShares MSCI Spain ETF
EWP
$1.98B
| $530K | ﹤0.01% |
18,341
+11,655
| +174% | +$331K |
|
2698
PUT
Pool Corp
POOL
$6.7B
| $530K | ﹤0.01% |
25
-5
| -17% | -$1.03K |
|
2699
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $530K | ﹤0.01% |
624
-106
| -15% | -$5.12K |
|
2700
Tactile Systems Technology
TCMD
$620M
| $530K | ﹤0.01% |
+7,851
| New | +$434K |
|
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.