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 | |
|---|---|---|---|---|---|---|
2601
CALL
InterDigital
IDCC
$6.68B
| $338K | ﹤0.01% |
51
+26
| +104% | +$1.89K |
|
2602
PUT
O-I Glass
OI
$1.39B
| $337K | ﹤0.01% |
196
+137
| +232% | +$2.39K |
|
2603
Plains GP Holdings
PAGP
$5.23B
| $337K | ﹤0.01% |
+16,775
| New | +$372K |
|
2604
CALL
Kirby Corp
KEX
$7.95B
| $336K | ﹤0.01% |
50
-3
| -6% | -$222 |
|
2605
PUT
Lindsay Corp
LNN
$1.16B
| $336K | ﹤0.01% |
+35
| New | +$3.41K |
|
|
RWT
2606
CALL
Redwood Trust
RWT
$616M
| $336K | ﹤0.01% |
223
-13
| -6% | -$210 |
|
2607
PUT
StoneX
SNEX
$8.83B
| $336K | ﹤0.01% |
+466
| New | +$3.95K |
|
2608
PUT
Energous
WATT
$80.3M
| $336K | ﹤0.01% |
1
-1
| -50% | -$4.88K |
|
2609
PUT
Patterson-UTI
PTEN
$3.87B
| $335K | ﹤0.01% |
324
-638
| -66% | -$9.4K |
|
2610
CALL
ZTO Express
ZTO
$18.2B
| $335K | ﹤0.01% |
212
+54
| +34% | +$870 |
|
|
MRNS
2611
PUT
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $335K | ﹤0.01% |
292
+268
| +1,117% | +$5.42K |
|
2612
Agnico Eagle Mines
AEM
$72.6B
| $334K | ﹤0.01% |
8,284
+4,642
| +127% | +$171K |
|
2613
PUT
CRH
CRH
$66.7B
| $334K | ﹤0.01% |
+127
| New | +$3.6K |
|
2614
PUT
Realty Income
O
$61.2B
| $334K | ﹤0.01% |
55
+1
| +2% | +$60 |
|
2615
PUT
Plains All American Pipeline
PAA
$17.4B
| $334K | ﹤0.01% |
167
+102
| +157% | +$2.33K |
|
2616
PUT
Texas Roadhouse
TXRH
$12.7B
| $334K | ﹤0.01% |
56
-307
| -85% | -$19.7K |
|
2617
PUT
Barclays
BCS
$94.1B
| $333K | ﹤0.01% |
462
+229
| +98% | +$1.84K |
|
2618
CALL
DHT Holdings
DHT
$2.97B
| $333K | ﹤0.01% |
851
+805
| +1,750% | +$3.73K |
|
2619
PUT
Expeditors International
EXPD
$22.9B
| $333K | ﹤0.01% |
49
-167
| -77% | -$11.7K |
|
2620
PUT
Celanese
CE
$5.09B
| $332K | ﹤0.01% |
37
-104
| -74% | -$10.2K |
|
|
STAY
2621
DELISTED
Extended Stay America, Inc. Paired Share Unit
STAY
| $332K | ﹤0.01% |
21,429
+12,464
| +139% | +$220K |
|
|
ACB
2622
Aurora Cannabis
ACB
$165M
| $331K | ﹤0.01% |
+556
| New | +$410K |
|
2623
Toyota
TM
$210B
| $331K | ﹤0.01% |
2,860
+1,899
| +198% | +$225K |
|
2624
PUT
Valley National Bancorp
VLY
$7.93B
| $330K | ﹤0.01% |
372
+371
| +37,100% | +$3.74K |
|
2625
CALL
Cerus
CERS
$587M
| $329K | ﹤0.01% |
649
+397
| +158% | +$2.3K |
|
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.