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 | |
|---|---|---|---|---|---|---|
4426
Renaissance IPO ETF
IPO
$149M
| $110K | ﹤0.01% |
3,551
-1,632
| -31% | -$48.6K |
|
4427
Magnachip Semiconductor
MX
$110M
| $110K | ﹤0.01% |
9,492
-76,184
| -89% | -$893K |
|
4428
PUT
Natural Resource Partners
NRP
$1.31B
| $110K | ﹤0.01% |
55
+54
| +5,400% | +$1.25K |
|
4429
Sabra Healthcare REIT
SBRA
$5.56B
| $110K | ﹤0.01% |
+5,179
| New | +$116K |
|
4430
CALL
Vishay Intertechnology
VSH
$4.6B
| $110K | ﹤0.01% |
52
-241
| -82% | -$4.67K |
|
|
AMRS
4431
CALL
DELISTED
Amyris Inc.
AMRS
| $110K | ﹤0.01% |
356
-281
| -44% | -$1.04K |
|
|
MGI
4432
CALL
DELISTED
MoneyGram International, Inc. New
MGI
| $110K | ﹤0.01% |
528
+125
| +31% | +$401 |
|
4433
CALL
Cato Corp
CATO
$65.7M
| $109K | ﹤0.01% |
63
+42
| +200% | +$752 |
|
4434
Dolby
DLB
$4.97B
| $109K | ﹤0.01% |
1,595
-14,031
| -90% | -$928K |
|
4435
CALL
Ecopetrol
EC
$33.7B
| $109K | ﹤0.01% |
55
-13
| -19% | -$240 |
|
|
GOOD
4436
PUT
Gladstone Commercial Corp
GOOD
$623M
| $109K | ﹤0.01% |
50
+30
| +150% | +$681 |
|
4437
PUT
MasTec
MTZ
$22.7B
| $109K | ﹤0.01% |
17
-1
| -6% | -$66 |
|
4438
PUT
Walker & Dunlop
WD
$1.73B
| $109K | ﹤0.01% |
17
-13
| -43% | -$822 |
|
|
ACOR
4439
PUT
DELISTED
Acorda Therapeutics
ACOR
| $109K | ﹤0.01% |
4
| – | – |
|
|
TLND
4440
PUT
DELISTED
Talend S.A. American Depositary Shares
TLND
| $109K | ﹤0.01% |
28
-65
| -70% | -$2.39K |
|
4441
CALL
Banco Bradesco
BBD
$37.4B
| $108K | ﹤0.01% |
162
-167
| -51% | -$1.05K |
|
4442
PUT
Domo
DOMO
$171M
| $108K | ﹤0.01% |
50
-55
| -52% | -$1.02K |
|
4443
PUT
H&R Block
HRB
$5.98B
| $108K | ﹤0.01% |
46
-32
| -41% | -$768 |
|
4444
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.42B
| $108K | ﹤0.01% |
78
-4
| -5% | -$53 |
|
4445
PUT
MillerKnoll
MLKN
$1.56B
| $108K | ﹤0.01% |
26
-19
| -42% | -$880 |
|
4446
PUT
ResMed
RMD
$31.1B
| $108K | ﹤0.01% |
7
-3
| -30% | -$432 |
|
4447
Televisa
TV
$1.49B
| $108K | ﹤0.01% |
9,218
-7,350
| -44% | -$81.4K |
|
4448
Caesarstone
CSTE
$69.5M
| $107K | ﹤0.01% |
7,156
-16,204
| -69% | -$260K |
|
4449
CoreCivic
CXW
$2.94B
| $107K | ﹤0.01% |
6,190
-5,184
| -46% | -$82.1K |
|
4450
Cedar Fair
FUN
$1.88B
| $107K | ﹤0.01% |
1,935
-29
| -1% | -$1.63K |
|
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.