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 | |
|---|---|---|---|---|---|---|
1176
CALL
State Street
STT
$50.8B
| $2.93M | 0.01% |
371
+86
| +30% | +$6.05K |
|
1177
CALL
Alcoa
AA
$11.8B
| $2.92M | 0.01% |
1,359
-599
| -31% | -$12.4K |
|
1178
Domino's
DPZ
$10.8B
| $2.92M | 0.01% |
9,935
+63
| +0.6% | +$17.4K |
|
|
KL
1179
CALL
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $2.92M | 0.01% |
662
-328
| -33% | -$14.5K |
|
1180
PUT
Equifax
EFX
$20.2B
| $2.91M | 0.01% |
208
-24
| -10% | -$3.33K |
|
1181
CALL
Invesco
IVZ
$13.3B
| $2.91M | 0.01% |
1,621
-376
| -19% | -$6.41K |
|
|
CS
1182
PUT
DELISTED
Credit Suisse Group
CS
| $2.9M | 0.01% |
2,160
+111
| +5% | +$1.42K |
|
|
IRBT
1183
PUT
DELISTED
iRobot
IRBT
| $2.9M | 0.01% |
573
-364
| -39% | -$18.3K |
|
1184
PUT
American Water Works
AWK
$26.4B
| $2.9M | 0.01% |
236
-85
| -26% | -$10.3K |
|
1185
PUT
T. Rowe Price
TROW
$24.8B
| $2.9M | 0.01% |
238
+182
| +325% | +$21.5K |
|
|
PLAN
1186
CALL
DELISTED
Anaplan, Inc.
PLAN
| $2.9M | 0.01% |
553
-466
| -46% | -$23.1K |
|
1187
PUT
AerCap
AER
$23.9B
| $2.89M | 0.01% |
470
-220
| -32% | -$12.9K |
|
1188
PUT
Brinker International
EAT
$7.9B
| $2.89M | 0.01% |
688
+133
| +24% | +$5.73K |
|
|
SKX
1189
PUT
DELISTED
Skechers
SKX
| $2.88M | 0.01% |
667
-92
| -12% | -$3.63K |
|
1190
Newmont
NEM
$100B
| $2.87M | 0.01% |
65,989
+40,038
| +154% | +$1.56M |
|
|
I
1191
CALL
DELISTED
INTELSAT S. A.
I
| $2.86M | 0.01% |
4,072
+1,723
| +73% | +$27.1K |
|
1192
CALL
BioMarin Pharmaceuticals
BMRN
$11.4B
| $2.86M | 0.01% |
338
+74
| +28% | +$5.59K |
|
|
BNY
1193
PUT
Bank of New York Mellon
BNY
$108B
| $2.85M | 0.01% |
566
-433
| -43% | -$20.7K |
|
1194
PUT
GoDaddy
GDDY
$12.2B
| $2.85M | 0.01% |
419
+258
| +160% | +$17.1K |
|
1195
Colgate-Palmolive
CL
$72.7B
| $2.84M | 0.01% |
41,315
+7,263
| +21% | +$495K |
|
1196
CALL
United Parks & Resorts
PRKS
$2.1B
| $2.83M | 0.01% |
893
+399
| +81% | +$11.5K |
|
|
SAVE
1197
DELISTED
Spirit Airlines, Inc.
SAVE
| $2.83M | 0.01% |
70,202
+65,204
| +1,305% | +$2.48M |
|
|
LNW
1198
CALL
DELISTED
Light & Wonder
LNW
| $2.83M | 0.01% |
1,056
+145
| +16% | +$3.73K |
|
|
CATM
1199
PUT
DELISTED
Cardtronics plc Class A Ordinary Shares (UK)
CATM
| $2.83M | 0.01% |
633
+602
| +1,942% | +$22.9K |
|
|
AABA
1200
PUT
DELISTED
Altaba Inc
AABA
| $2.83M | 0.01% |
594
-1,175
| -66% | -$23.1K |
|
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.