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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2576
CALL
abrdn Physical Gold Shares ETF
SGOL
$6.92B
| $346K | ﹤0.01% |
280
+260
| +1,300% | +$3.08K |
|
|
ASXC
2577
CALL
DELISTED
Asensus Surgical, Inc.
ASXC
| $346K | ﹤0.01% |
118
+19
| +19% | +$863 |
|
2578
CALL
Boise Cascade
BCC
$2.74B
| $345K | ﹤0.01% |
145
-131
| -47% | -$3.76K |
|
|
BPMC
2579
PUT
DELISTED
Blueprint Medicines
BPMC
| $345K | ﹤0.01% |
64
-62
| -49% | -$3.77K |
|
|
MXWL
2580
DELISTED
Maxwell Technologies Inc
MXWL
| $345K | ﹤0.01% |
166,709
+115,391
| +225% | +$312K |
|
|
ZGNX
2581
DELISTED
Zogenix, Inc.
ZGNX
| $345K | ﹤0.01% |
9,464
-7,604
| -45% | -$311K |
|
2582
PUT
Axalta
AXTA
$7.01B
| $344K | ﹤0.01% |
147
-321
| -69% | -$7.97K |
|
2583
PUT
Copart
CPRT
$25.9B
| $344K | ﹤0.01% |
288
+36
| +14% | +$445 |
|
2584
HF Sinclair
DINO
$15.9B
| $344K | ﹤0.01% |
+6,747
| New | +$413K |
|
2585
Indaptus Therapeutics
INDP
$348M
| $344K | ﹤0.01% |
+20
| New | +$273K |
|
2586
L3Harris
LHX
$55.9B
| $344K | ﹤0.01% |
+2,560
| New | +$387K |
|
|
NEPT
2587
CALL
DELISTED
Neptune Wellness Solutions Inc. Ordinary Shares
NEPT
| $344K | ﹤0.01% |
+1
| New | +$4.86K |
|
|
STML
2588
DELISTED
Stemline Therapeutics, Inc.
STML
| $344K | ﹤0.01% |
36,307
+27,037
| +292% | +$351K |
|
2589
CALL
BorgWarner
BWA
$13.2B
| $343K | ﹤0.01% |
112
-69
| -38% | -$2.31K |
|
2590
CALL
Robert Half
RHI
$3.61B
| $343K | ﹤0.01% |
60
+25
| +71% | +$1.53K |
|
2591
CALL
Gogo Inc
GOGO
$515M
| $342K | ﹤0.01% |
1,147
+348
| +44% | +$1.74K |
|
|
KW
2592
DELISTED
Kennedy-Wilson Holdings
KW
| $341K | ﹤0.01% |
+18,771
| New | +$360K |
|
2593
CALL
Puma Biotechnology
PBYI
$406M
| $341K | ﹤0.01% |
168
+68
| +68% | +$2.04K |
|
2594
PUT
Qiagen
QGEN
$8.53B
| $341K | ﹤0.01% |
93
+49
| +111% | +$1.82K |
|
2595
Warner Bros
WBD
$64.6B
| $341K | ﹤0.01% |
+13,803
| New | +$420K |
|
|
K
2596
DELISTED
Kellanova
K
| $340K | ﹤0.01% |
+6,352
| New | +$384K |
|
2597
PUT
Merit Medical Systems
MMSI
$4.43B
| $340K | ﹤0.01% |
61
+40
| +190% | +$2.38K |
|
|
POLY
2598
CALL
DELISTED
Plantronics, Inc.
POLY
| $340K | ﹤0.01% |
103
+68
| +194% | +$3.36K |
|
|
NE
2599
CALL
DELISTED
Noble Corporation
NE
| $340K | ﹤0.01% |
1,300
+472
| +57% | +$2.24K |
|
2600
Itaú Unibanco
ITUB
$91.3B
| $339K | ﹤0.01% |
+51,074
| New | +$328K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.