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 | |
|---|---|---|---|---|---|---|
2501
PUT
Zions Bancorporation
ZION
$10.1B
| $643K | ﹤0.01% |
124
-282
| -69% | -$13.7K |
|
2502
Cencora
COR
$60.3B
| $642K | ﹤0.01% |
7,555
-13,225
| -64% | -$1.13M |
|
2503
CALL
Intellia Therapeutics
NTLA
$1.5B
| $642K | ﹤0.01% |
438
+110
| +34% | +$1.53K |
|
2504
CALL
Omeros
OMER
$709M
| $641K | ﹤0.01% |
455
-510
| -53% | -$7.47K |
|
|
DERM
2505
CALL
DELISTED
Dermira, Inc.
DERM
| $641K | ﹤0.01% |
423
+397
| +1,527% | +$3.43K |
|
2506
Alerian MLP ETF
AMLP
$13B
| $640K | ﹤0.01% |
15,060
+1,827
| +14% | +$76.7K |
|
2507
CALL
Trupanion
TRUP
$1.05B
| $640K | ﹤0.01% |
171
-94
| -35% | -$2.76K |
|
2508
Viasat
VSAT
$9.79B
| $640K | ﹤0.01% |
+8,754
| New | +$626K |
|
|
2509
PUT
Trupanion
TRUP
$1.05B
| $636K | ﹤0.01% |
170
-375
| -69% | -$11K |
|
|
SHLX
2510
CALL
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $636K | ﹤0.01% |
315
+35
| +13% | +$710 |
|
2511
Verizon
VZ
$194B
| $635K | ﹤0.01% |
+10,349
| New | +$624K |
|
|
AMRS
2512
PUT
DELISTED
Amyris Inc.
AMRS
| $635K | ﹤0.01% |
2,058
+405
| +25% | +$1.5K |
|
2513
GameStop
GME
$9.5B
| $634K | ﹤0.01% |
417,156
+373,920
| +865% | +$549K |
|
2514
Moderna
MRNA
$21.5B
| $634K | ﹤0.01% |
32,452
-25,499
| -44% | -$452K |
|
2515
CALL
Mettler-Toledo International
MTD
$26.8B
| $634K | ﹤0.01% |
8
+3
| +60% | +$2.17K |
|
2516
Direxion Daily Semiconductor Bear 3X ETF
SOXS
$1.74B
| – | – |
0
| – | – |
|
|
CEQP
2517
PUT
DELISTED
Crestwood Equity Partners LP
CEQP
| $634K | ﹤0.01% |
206
+200
| +3,333% | +$6.58K |
|
|
PSXP
2518
PUT
DELISTED
PHILLIPS 66 PARTNERS LP
PSXP
| $634K | ﹤0.01% |
103
+96
| +1,371% | +$5.42K |
|
|
PBFX
2519
CALL
DELISTED
PBF LOGISTICS LP
PBFX
| $633K | ﹤0.01% |
313
-70
| -18% | -$1.46K |
|
2520
PUT
Jack in the Box
JACK
$278M
| $632K | ﹤0.01% |
81
+12
| +17% | +$994 |
|
2521
PUT
Lantheus
LNTH
$6.82B
| $631K | ﹤0.01% |
+308
| New | +$6.23K |
|
2522
CALL
Range Resources
RRC
$9.11B
| $631K | ﹤0.01% |
1,302
-82
| -6% | -$331 |
|
|
HTZ
2523
CALL
DELISTED
Hertz Global Holdings, Inc.
HTZ
| $630K | ﹤0.01% |
400
+142
| +55% | +$2.13K |
|
2524
CALL
Chord Energy
CHRD
$7.79B
| $629K | ﹤0.01% |
1,931
+1,355
| +235% | +$3.88K |
|
|
MIME
2525
CALL
DELISTED
Mimecast Limited
MIME
| $629K | ﹤0.01% |
145
-21
| -13% | -$873 |
|
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.