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 | |
|---|---|---|---|---|---|---|
2526
iShares Russell 1000 Value ETF
IWD
$82B
| $627K | ﹤0.01% |
4,601
+3,886
| +543% | +$512K |
|
2527
Ingles Markets
IMKTA
$1.63B
| $626K | ﹤0.01% |
+13,195
| New | +$562K |
|
|
MAG
2528
PUT
DELISTED
MAG Silver
MAG
| $626K | ﹤0.01% |
529
+100
| +23% | +$1.03K |
|
2529
Puma Biotechnology
PBYI
$406M
| $626K | ﹤0.01% |
71,650
+68,243
| +2,003% | +$565K |
|
2530
America Movil
AMX
$78.1B
| $625K | ﹤0.01% |
+39,110
| New | +$612K |
|
2531
CALL
Fortuna Silver Mines
FSM
$2.59B
| $625K | ﹤0.01% |
1,532
+619
| +68% | +$2.02K |
|
|
EFOR
2532
PUT
Everforth Inc
EFOR
$845M
| $624K | ﹤0.01% |
+88
| New | +$5.74K |
|
2533
PUT
Omeros
OMER
$709M
| $624K | ﹤0.01% |
443
+259
| +141% | +$3.79K |
|
2534
CALL
Precigen
PGEN
$1.93B
| $624K | ﹤0.01% |
1,140
-273
| -19% | -$1.54K |
|
|
CDK
2535
PUT
DELISTED
CDK Global, Inc.
CDK
| $623K | ﹤0.01% |
114
-373
| -77% | -$19.2K |
|
2536
CALL
Toro Company
TTC
$8.93B
| $621K | ﹤0.01% |
78
+76
| +3,800% | +$5.82K |
|
2537
PUT
Ingevity
NGVT
$2.55B
| $620K | ﹤0.01% |
71
+61
| +610% | +$5.33K |
|
2538
MetLife
MET
$61B
| $619K | ﹤0.01% |
+12,156
| New | +$587K |
|
|
SPR
2539
CALL
DELISTED
Spirit AeroSystems
SPR
| $619K | ﹤0.01% |
85
-18
| -17% | -$1.49K |
|
2540
Cytokinetics
CYTK
$11B
| $618K | ﹤0.01% |
58,271
+51,476
| +758% | +$529K |
|
2541
iShares MSCI India ETF
INDA
$6.71B
| $618K | ﹤0.01% |
17,587
-7,630
| -30% | -$262K |
|
|
JKS
2542
CALL
JinkoSolar
JKS
$775M
| $618K | ﹤0.01% |
275
+50
| +22% | +$873 |
|
|
TELL
2543
CALL
DELISTED
Tellurian Inc.
TELL
| $618K | ﹤0.01% |
849
-540
| -39% | -$4.11K |
|
2544
PUT
New York Times
NYT
$11.6B
| $617K | ﹤0.01% |
192
-63
| -25% | -$1.96K |
|
2545
CALL
RCI Hospitality Holdings
RICK
$199M
| $617K | ﹤0.01% |
301
+286
| +1,907% | +$5.51K |
|
2546
PUT
ING
ING
$93.8B
| $615K | ﹤0.01% |
511
-682
| -57% | -$7.81K |
|
2547
PUT
Equity Residential
EQR
$25.4B
| $614K | ﹤0.01% |
76
+63
| +485% | +$5.36K |
|
2548
CALL
Guidewire Software
GWRE
$11.5B
| $614K | ﹤0.01% |
56
-39
| -41% | -$4.36K |
|
2549
CALL
Stepan Co
SCL
$1.31B
| $614K | ﹤0.01% |
+60
| New | +$5.85K |
|
|
ARNA
2550
PUT
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $613K | ﹤0.01% |
135
+8
| +6% | +$378 |
|
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.