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 | |
|---|---|---|---|---|---|---|
2476
CALL
Energizer
ENR
$1.44B
| $657K | ﹤0.01% |
131
-53
| -29% | -$2.44K |
|
2477
CALL
Builders FirstSource
BLDR
$7.84B
| $655K | ﹤0.01% |
258
+169
| +190% | +$4.04K |
|
2478
Rapid7
RPD
$634M
| $655K | ﹤0.01% |
11,705
+11,615
| +12,906% | +$604K |
|
2479
CALL
Cal-Maine
CALM
$4.28B
| $654K | ﹤0.01% |
153
-13
| -8% | -$542 |
|
|
DRRX
2480
DELISTED
DURECT Corp
DRRX
| $654K | ﹤0.01% |
+17,218
| New | +$355K |
|
2481
PUT
Infosys
INFY
$45B
| $654K | ﹤0.01% |
634
+294
| +86% | +$2.96K |
|
2482
Virgin Galactic
SPCE
$320M
| $653K | ﹤0.01% |
+2,829
| New | +$552K |
|
|
TWOU
2483
DELISTED
2U Inc
TWOU
| $652K | ﹤0.01% |
906
-295
| -25% | -$183K |
|
2484
CALL
Cincinnati Financial
CINF
$28.3B
| $651K | ﹤0.01% |
62
+32
| +107% | +$3.5K |
|
|
EBIX
2485
CALL
DELISTED
Ebix Inc
EBIX
| $651K | ﹤0.01% |
195
-1
| -0.5% | -$37 |
|
2486
PUT
Boot Barn
BOOT
$4.55B
| $650K | ﹤0.01% |
146
-34
| -19% | -$1.34K |
|
2487
First American
FAF
$7.67B
| $650K | ﹤0.01% |
+11,159
| New | +$682K |
|
2488
CALL
Invitation Homes
INVH
$17.7B
| $650K | ﹤0.01% |
217
+191
| +735% | +$5.72K |
|
2489
CALL
Ameriprise Financial
AMP
$46.8B
| $649K | ﹤0.01% |
39
-84
| -68% | -$13K |
|
2490
Wendy's
WEN
$1.33B
| $649K | ﹤0.01% |
29,229
-68,393
| -70% | -$1.45M |
|
2491
PUT
Annaly Capital Management
NLY
$16.9B
| $648K | ﹤0.01% |
172
-97
| -36% | -$3.54K |
|
2492
Seagate
STX
$193B
| $647K | ﹤0.01% |
+10,874
| New | +$625K |
|
|
CIR
2493
PUT
DELISTED
CIRCOR International, Inc
CIR
| $647K | ﹤0.01% |
140
+25
| +22% | +$1.03K |
|
|
APLS
2494
PUT
DELISTED
Apellis Pharmaceuticals
APLS
| $646K | ﹤0.01% |
211
+191
| +955% | +$5.29K |
|
2495
PUT
Bally's
BALY
$672M
| $646K | ﹤0.01% |
+252
| New | +$6.07K |
|
2496
CALL
Sasol
SSL
$7.58B
| $646K | ﹤0.01% |
299
+286
| +2,200% | +$5.47K |
|
2497
Marcus Corp
MCS
$732M
| $645K | ﹤0.01% |
20,318
+15,620
| +332% | +$528K |
|
|
HOME
2498
CALL
DELISTED
At Home Group Inc.
HOME
| $645K | ﹤0.01% |
1,174
+80
| +7% | +$651 |
|
2499
CALL
The GEO Group
GEO
$4.13B
| $644K | ﹤0.01% |
388
+144
| +59% | +$2.19K |
|
|
HTT
2500
PUT
High Templar Tech Ltd
HTT
$377M
| $644K | ﹤0.01% |
1,369
+814
| +147% | +$4.79K |
|
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.