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Institutional Holdings of NATUS MEDICAL INCORPORATED (BABY) on 12/31/2011

1. Company Information

Company/StockNATUS MEDICAL INCORPORATED (stock symbol: BABY)
Funds Ownership100 out of total 3028 funds (3%) own this stock
Funds own total 23,684,407 shares, 83.48% of all outstanding shares
Funds SOLD -1,762,864 shares (-6.93%) in the quarter ended on 12/31/2011

2. Top 20 Funds Held BABY in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)DEERFIELD MANAGEMENT CO NY2,730,000Cut -6.83%1.35%9.62%
2.)CAMBER CAPITAL MANAGEMENT LLC2,062,788New2.64%7.27%
3.)BROADFIN CAPITAL LLC1,710,227Added 48.72%7.40%6.03%
4.)VANGUARD GROUP INC1,627,621Added 4.50%0.00%5.74%
5.)BLACKROCK FUND ADVISORS1,489,966Added 3.55%0.01%5.25%
6.)MARXE AUSTIN W & GREENHOUSE DAVID M1,121,471Cut -6.09%1.52%3.95%
7.)DIMENSIONAL FUND ADVISORS INC986,326Cut -0.76%0.01%3.48%
8.)BLACKROCK INSTITUTIONAL TRUST COMPANY NA917,759Added 6.05%0.00%3.23%
9.)ROBECO INVESTMENT MANAGEMENT INC851,350Added 73.00%0.04%3.00%
10.)BLACKROCK ADVISORS LLC807,399Cut -1.70%0.01%2.85%
11.)WATERSTONE CAPITAL MANAGEMENT LP648,757Added 29.75%0.38%2.29%
12.)MILLENNIUM MANAGEMENT LLC633,800Cut -18.78%0.05%2.23%
13.)STATE STREET CORP600,136Cut -1.01%0.00%2.12%
14.)CANNELL J CARLO489,946Added 0.03%3.99%1.73%
15.)COLUMBIA PARTNERS L L C INVESTMENT MANAGEMENT483,012Cut -3.35%0.24%1.70%
16.)WESTWOOD MANAGEMENT CORP TX440,871Added 5.32%0.04%1.55%
17.)NORTHERN TRUST CORP424,619Added 2.10%0.00%1.50%
18.)MOTLEY FOOL ASSET MANAGEMENT LLC424,600Cut -8.14%2.11%1.50%
19.)BEDDOW CAPITAL MANAGEMENT INC379,100Cut -6.00%1.34%1.34%
20.)THOMSON HORSTMANN & BRYANT INC372,500Cut -77.43%0.25%1.31%



3. Top 20 Funds Held BABY in this Quarter (By % of Portfolio) Add to Yahoo Finance Message Board

No.FundSharesPut/CallActivity(Shr)% Port.% Out. Shrs
1.)BROADFIN CAPITAL LLC1,710,227Added 48.72%7.40%6.03%
2.)CANNELL J CARLO489,946Added 0.03%3.99%1.73%
3.)CAMBER CAPITAL MANAGEMENT LLC2,062,788New2.64%7.27%
4.)MOTLEY FOOL ASSET MANAGEMENT LLC424,600Cut -8.14%2.11%1.50%
5.)RK CAPITAL MANAGEMENT LLC290,300New1.85%1.02%
6.)MARXE AUSTIN W & GREENHOUSE DAVID M1,121,471Cut -6.09%1.52%3.95%
7.)DEERFIELD MANAGEMENT CO NY2,730,000Cut -6.83%1.35%9.62%
8.)BEDDOW CAPITAL MANAGEMENT INC379,100Cut -6.00%1.34%1.34%
9.)JAY JEFFREY R145,074New1.25%0.51%
10.)GRT CAPITAL PARTNERS LLC358,150Added 158.97%1.08%1.26%
11.)WATERSTONE CAPITAL MANAGEMENT LP648,757Added 29.75%0.38%2.29%
12.)THOMSON HORSTMANN & BRYANT INC372,500Cut -77.43%0.25%1.31%
13.)COLUMBIA PARTNERS L L C INVESTMENT MANAGEMENT483,012Cut -3.35%0.24%1.70%
14.)MISSOURI VALLEY PARTNERS INC43,468Cut -11.26%0.19%0.15%
15.)CATAPULT CAPITAL MANAGEMENT LLC120,000Added 9.09%0.17%0.42%
16.)PARADIGM CAPITAL MANAGEMENT INC NY212,100Added 910.00%0.12%0.75%
17.)HIGHLAND CAPITAL MANAGEMENT LP89,300Cut -3.98%0.10%0.31%
18.)THOMPSON INVESTMENT MANAGEMENT INC24,075Added 13.83%0.06%0.08%
19.)MANATUCK HILL PARTNERS LLC50,000New0.06%0.18%
20.)LIGHTBOX CAPITAL MANAGEMENT LLC10,208New0.05%0.04%

4. Top 20 Funds BOUGHT NEW BABY in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)CAMBER CAPITAL MANAGEMENT LLC2,062,7882.64%7.27%
2.)RK CAPITAL MANAGEMENT LLC290,3001.85%1.02%
3.)JAY JEFFREY R145,0741.25%0.51%
4.)TWO SIGMA INVESTMENTS LLC82,6540.01%0.29%
5.)DEERE & CO55,6920.04%0.20%
6.)MANATUCK HILL PARTNERS LLC50,0000.06%0.18%
7.)GUGGENHEIM CAPITAL LLC45,5850.00%0.16%
8.)FIRST TRUST ADVISORS LP19,1260.00%0.07%
9.)TWO SIGMA ADVISERS LLC13,8000.01%0.05%
10.)DIAMOND HILL CAPITAL MANAGEMENT INC13,0000.00%0.05%
11.)WOLVERINE ASSET MANAGEMENT LLC12,0000.00%0.04%
12.)SUNRISE PARTNERS LLC CT11,5630.01%0.04%
13.)LIGHTBOX CAPITAL MANAGEMENT LLC10,2080.05%0.04%
14.)HARRIS FINANCIAL CORP6,0000.00%0.02%
15.)DAVIDSON D A & CO1000.00%0.00%
16.)LADENBURG THALMANN FINANCIAL SERVICES INC1000.00%0.00%

5. Top 20 Funds SOLD OUT BABY in this Quarter (By Shares) Add to Yahoo Finance Message Board

No.FundSharesPut/Call% Port.% Out. Shrs
1.)SPARTA ASSET MANAGEMENT LLC863,9881.73%3.05%
2.)EAGLE ASSET MANAGEMENT INC744,9530.07%2.63%
3.)FISHER ASSET MANAGEMENT LLC740,9750.02%2.61%
4.)HAMBRECHT & QUIST CAPITAL MANAGEMENT LLC401,4940.89%1.42%
5.)ANTHION MANAGEMENT LLC390,2000.94%1.38%
6.)PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO237,2850.01%0.84%
7.)CITADEL ADVISORS LLC235,8760.01%0.83%
8.)CONNORS INVESTOR SERVICES INC104,6700.45%0.37%
9.)CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM103,2230.00%0.36%
10.)EMERALD ADVISERS INC PA92,9020.09%0.33%
11.)ALPHAONE INVESTMENT SERVICES LLC90,0380.38%0.32%
12.)TUDOR INVESTMENT CORP ET AL37,0000.01%0.13%
13.)NISA INVESTMENT ADVISORS L L C30,4000.01%0.11%
14.)BECKER CAPITAL MANAGEMENT INC21,1000.01%0.07%
15.)GW CAPITAL MANAGEMENT LLC20,2170.01%0.07%
16.)EMERALD MUTUAL FUND ADVISERS TRUST19,6300.08%0.07%
17.)MAGNETAR FINANCIAL LLC18,9340.01%0.07%
18.)SUSQUEHANNA INTERNATIONAL GROUP LLP14,5720.00%0.05%
19.)FORWARD MANAGEMENT LLC3400.00%0.00%