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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1651
PUT
Toll Brothers
TOL
$14B
| $121K | 0.01% |
222
+103
| +87% | +$4.84K |
|
1652
CALL
Agios Pharmaceuticals
AGIO
$2.16B
| $120K | 0.01% |
184
+132
| +254% | +$10.2K |
|
1653
PUT
3D Systems Corp
DDD
$420M
| $120K | 0.01% |
285
-390
| -58% | -$4.17K |
|
|
MSB
1654
Mesabi Trust
MSB
$295M
| $120K | 0.01% |
4,661
-592
| -11% | -$15.9K |
|
1655
PUT
Nutrien
NTR
$32.7B
| $120K | 0.01% |
+559
| New | +$28K |
|
|
SCHW
1656
PUT
Charles Schwab
SCHW
$177B
| $120K | 0.01% |
593
-480
| -45% | -$25.7K |
|
1657
PUT
iShares Silver Trust
SLV
$28.1B
| $120K | 0.01% |
689
-63
| -8% | -$995 |
|
1658
Transact Technologies
TACT
$51.7M
| $120K | 0.01% |
9,258
+8,621
| +1,353% | +$119K |
|
|
MDCO
1659
CALL
DELISTED
Medicines Co
MDCO
| $120K | 0.01% |
168
+64
| +62% | +$2K |
|
|
DM
1660
PUT
DELISTED
Dominion Energy Midstream Ptr LP
DM
| $120K | 0.01% |
189
+178
| +1,618% | +$4.73K |
|
|
FMSA
1661
DELISTED
Fairmount Santrol Holdings Inc.
FMSA
| $120K | 0.01% |
28,378
+26,833
| +1,737% | +$135K |
|
|
JNPR
1662
PUT
DELISTED
Juniper Networks
JNPR
| $119K | 0.01% |
1,350
+490
| +57% | +$13K |
|
1663
CALL
Eli Lilly
LLY
$1.07T
| $119K | 0.01% |
1,963
+1,019
| +108% | +$82K |
|
1664
Mitek Systems
MITK
$762M
| $119K | 0.01% |
16,130
+11,246
| +230% | +$91.6K |
|
1665
CALL
Skyworks Solutions
SWKS
$9.06B
| $119K | 0.01% |
341
-283
| -45% | -$29.4K |
|
|
TGI
1666
PUT
DELISTED
Triumph Group
TGI
| $119K | 0.01% |
705
+689
| +4,306% | +$18.8K |
|
1667
Virtu Financial
VIRT
$5.2B
| $119K | 0.01% |
3,610
-3,766
| -51% | -$97.5K |
|
|
NETI
1668
DELISTED
Eneti Inc.
NETI
| $119K | 0.01% |
1,818
-3,137
| -63% | -$225K |
|
|
VRAY
1669
DELISTED
ViewRay, Inc.
VRAY
| $119K | 0.01% |
18,509
-34,561
| -65% | -$288K |
|
|
HDP
1670
DELISTED
Hortonworks, Inc.
HDP
| $119K | 0.01% |
5,881
-12,571
| -68% | -$247K |
|
1671
CALL
Northern Trust
NTRS
$22.2B
| $118K | 0.01% |
203
+102
| +101% | +$10.7K |
|
1672
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $118K | 0.01% |
464
+167
| +56% | +$9.03K |
|
1673
Wabtec
WAB
$51.1B
| $118K | 0.01% |
+1,452
| New | +$117K |
|
|
AMRS
1674
CALL
DELISTED
Amyris Inc.
AMRS
| $118K | 0.01% |
900
+176
| +24% | +$945 |
|
1675
PUT
Equinix
EQIX
$107B
| $117K | 0.01% |
164
+52
| +46% | +$21.9K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.