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 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1376
CALL
Manhattan Associates
MANH
$8.97B
| $1.9M | 0.01% |
235
+220
| +1,467% | +$17.6K |
|
1377
CALL
BCE
BCE
$19.9B
| $1.89M | 0.01% |
391
+167
| +75% | +$7.81K |
|
1378
PUT
Steel Dynamics
STLD
$35.6B
| $1.89M | 0.01% |
635
+444
| +232% | +$13.1K |
|
1379
Target
TGT
$62.1B
| $1.89M | 0.01% |
+17,684
| New | +$1.68M |
|
1380
MSCI
MSCI
$40B
| $1.88M | 0.01% |
+8,633
| New | +$2M |
|
1381
Hilton Grand Vacations
HGV
$3.84B
| $1.88M | 0.01% |
58,680
+24,453
| +71% | +$769K |
|
1382
Nutanix
NTNX
$14.9B
| $1.88M | 0.01% |
71,537
-65,568
| -48% | -$1.55M |
|
1383
CALL
CACI
CACI
$10.8B
| $1.87M | 0.01% |
+81
| New | +$17.5K |
|
1384
CALL
Tower Semiconductor
TSEM
$26.4B
| $1.87M | 0.01% |
973
+38
| +4% | +$709 |
|
1385
CALL
LKQ Corp
LKQ
$6.58B
| $1.87M | 0.01% |
595
+266
| +81% | +$7.28K |
|
|
TSG
1386
CALL
DELISTED
The Stars Group Inc.
TSG
| $1.87M | 0.01% |
1,248
+525
| +73% | +$8.16K |
|
1387
iShares 3-7 Year Treasury Bond ETF
IEI
$18.1B
| $1.87M | 0.01% |
+14,735
| New | +$1.86M |
|
1388
CALL
Sensata Technologies
ST
$6.65B
| $1.87M | 0.01% |
373
-260
| -41% | -$12.3K |
|
1389
PUT
Tenet Healthcare
THC
$20.1B
| $1.87M | 0.01% |
844
-772
| -48% | -$16.4K |
|
1390
CALL
Cardinal Health
CAH
$53.4B
| $1.86M | 0.01% |
395
-20
| -5% | -$913 |
|
|
MRO
1391
PUT
DELISTED
Marathon Oil Corporation
MRO
| $1.86M | 0.01% |
1,514
+74
| +5% | +$957 |
|
1392
CALL
Sunrun
RUN
$2.37B
| $1.85M | 0.01% |
1,110
+658
| +146% | +$11.5K |
|
1393
CALL
Cirrus Logic
CRUS
$6.74B
| $1.85M | 0.01% |
346
+60
| +21% | +$3.06K |
|
|
LNW
1394
CALL
DELISTED
Light & Wonder
LNW
| $1.85M | 0.01% |
911
+183
| +25% | +$3.61K |
|
1395
General Mills
GIS
$19.2B
| $1.85M | 0.01% |
33,588
-80,570
| -71% | -$4.34M |
|
|
NVEE
1396
PUT
DELISTED
NV5 Global
NVEE
| $1.85M | 0.01% |
1,084
-440
| -29% | -$8K |
|
|
KSU
1397
DELISTED
Kansas City Southern
KSU
| $1.84M | 0.01% |
+13,824
| New | +$1.72M |
|
1398
CALL
Urban Outfitters
URBN
$5.99B
| $1.83M | 0.01% |
653
+152
| +30% | +$3.54K |
|
1399
PUT
Masco
MAS
$16B
| $1.83M | 0.01% |
440
+346
| +368% | +$13.9K |
|
|
PFPT
1400
DELISTED
Proofpoint, Inc.
PFPT
| $1.83M | 0.01% |
+14,202
| New | +$1.74M |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.