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
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MIK
551
DELISTED
Michaels Stores, Inc
MIK
| $387K | 0.03% |
+16,758
| New | +$428K |
|
552
CALL
Wells Fargo
WFC
$262B
| $385K | 0.03% |
1,684
+22
| +1% | +$1.21K |
|
|
VAL
553
DELISTED
Valspar
VAL
| $385K | 0.03% |
+5,366
| New | +$421K |
|
554
Invesco CurrencyShares Japanese Yen Trust
FXY
$425M
| $383K | 0.03% |
4,741
-459
| -9% | -$36.5K |
|
555
PUT
Puma Biotechnology
PBYI
$401M
| $383K | 0.03% |
186
+109
| +142% | +$10.3K |
|
|
MRO
556
DELISTED
Marathon Oil Corporation
MRO
| $383K | 0.03% |
24,911
+16,445
| +194% | +$312K |
|
|
FIG
557
DELISTED
Fortress Investment Group Llc
FIG
| $381K | 0.03% |
68,781
-25,355
| -27% | -$160K |
|
|
MEG
558
DELISTED
Media General, Inc
MEG
| $381K | 0.03% |
+27,242
| New | +$370K |
|
|
ODP
559
DELISTED
ODP
ODP
| $378K | 0.03% |
5,903
+4,309
| +270% | +$336K |
|
560
PUT
Salesforce
CRM
$133B
| $377K | 0.03% |
1,727
-163
| -9% | -$11.6K |
|
561
CSX Corp
CSX
$92.8B
| $374K | 0.03% |
41,814
+13,260
| +46% | +$130K |
|
562
Marathon Petroleum
MPC
$92.2B
| $374K | 0.03% |
+8,075
| New | +$416K |
|
563
CALL
Zillow
Z
$7.18B
| $374K | 0.03% |
+888
| New | +$23.2K |
|
564
Nasdaq
NDAQ
$51.4B
| $373K | 0.03% |
21,027
-22,800
| -52% | -$391K |
|
565
Air Products & Chemicals
APD
$66.1B
| $371K | 0.03% |
3,150
+521
| +20% | +$66.3K |
|
566
PUT
VanEck International High Yield Bond ETF
IHY
$43.1M
| $369K | 0.03% |
444
+306
| +222% | +$7.34K |
|
|
GWPH
567
PUT
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $369K | 0.03% |
144
-30
| -17% | -$3.34K |
|
568
Nokia
NOK
$57.4B
| $368K | 0.03% |
54,362
-451
| -0.8% | -$2.96K |
|
|
XOOM
569
DELISTED
XOOM CORP COM
XOOM
| $368K | 0.03% |
14,825
+9,320
| +169% | +$232K |
|
570
ATI
ATI
$26.7B
| $367K | 0.03% |
25,935
+22,142
| +584% | +$459K |
|
571
Hartford Financial Services
HIG
$38.6B
| $367K | 0.03% |
+8,037
| New | +$371K |
|
572
ProShares UltraShort Bloomberg Crude Oil
SCO
$603M
| $366K | 0.03% |
106
+94
| +783% | +$337K |
|
|
BHI
573
PUT
DELISTED
Baker Hughes
BHI
| $366K | 0.03% |
556
+173
| +45% | +$9.66K |
|
574
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $364K | 0.03% |
1,149
+400
| +53% | +$106K |
|
575
Lumen
LUMN
$6.9B
| $362K | 0.03% |
14,438
+11,393
| +374% | +$315K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.